![](media/image1.pct){width="5.958333333333333in"
height="0.4166666666666667in"}

[National Spherical Tokamak Experiment]{.underline}

**NSTX**

SYSTEM DESIGN DESCRIPTION

HEATING & CURRENT DRIVE SYSTEMS

NSTX-SDD-2X-026

**Revision 0**

**July 16, 1996**

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

J. Randall Wilson

WBS 2 Manager

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Charles Neumeyer

NSTX Project Engineering Manager

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Masa Ono

NSTX Project Manager

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**Introduction 1**

**General Heating & Current Drive System Design Description 2**

[1.0 Design Description 2]{.smallcaps}

> *1.1 System Design Features 2*
>
> *1.2 Layout 2*
>
> *1.3 Component Design Features 2*

[2.0 System Performance \[R1\] 2]{.smallcaps}

> *2.1 Baseline Operation 2*
>
> *2.2 Upgrades 3*
>
> 2.2.1 ECH upgrades 3
>
> 2.2.2 HHFW Upgrade 3
>
> 2.2.3 CHI Upgrades 3
>
> 2.2.4 NBI Upgrade 3

[3.0 Interfaces 4]{.smallcaps}

> *3.1 Interface Points 4*
>
> *3.1 Interface Requirements 4*

[4.0 Design Basis 4]{.smallcaps}

> *4.1 Standards & Codes 4*
>
> *4.2 Supporting Analysis 5*

[5.0 Design Implementation 5]{.smallcaps}

> *5.1 Prototypes 5*
>
> *5.2 Mock-ups 5*
>
> *Refer to sections describing individual WBS 2 subelements 5*
>
> *5.3 Component Procurement and Fabrication 5*
>
> *5.4 System Assembly, Installation, and Testing 5*

**ECH Baseline System Design Description 6**

**ECH Upgrade System Design Description 7**

[1.0 Design Description 7]{.smallcaps}

> *1.1 System Design Features 7*
>
> *1.2 Layout 7*
>
> *1.3 Component Design Features 9*

[2.0 System Performance 15]{.smallcaps}

[3.0 Interfaces 15]{.smallcaps}

> *3.1 Interface Points 15*
>
> *3.2 Interface Requirements 15*

[4.0 Design Basis 16]{.smallcaps}

> *4.1 Standards & Codes 16*
>
> *4.2 Supporting Analysis 16*

[5.0 Design Implementation 16]{.smallcaps}

> *5.1 Prototypes 16*
>
> *5.2 Mock-ups 16*
>
> *5.3 Component Procurement and Fabrication 16*
>
> *5.4 System Assembly, Installation, and Testing 16*

**HHFW System Description 17**

[1.0 Design Description 17]{.smallcaps}

> *1.1 System Design Features 17*
>
> *1.2 Layout 17*

[2.0 System Performance 20]{.smallcaps}

> *2.1 Baseline Operation 20*
>
> *2.2 Upgrades 20*
>
> 2.2.1 Neutral Beam Injection (NBI) Upgrade 20
>
> 2.2.2 Long pulse upgrade 20
>
> *2.3 Pulse Repetition Period and Operating Life 20*

[3.0 Interfaces 21]{.smallcaps}

> *3.1 Interface requirements 21*
>
> *3.2 Interface Requirements 21*

[4.0 Design Basis 22]{.smallcaps}

> *4.1 Standards and Codes 22*
>
> *4.2 Supporting Analysis 22*

[5.0 Design Implementation 22]{.smallcaps}

> *5.1 Prototypes 22*
>
> *5.2 Mockups 22*
>
> *5.3 Component Procurement and Fabrication 22*
>
> *5.4 System assembly, installation, and testing 23*

**CHI System Description 23**

[1.0 Design Description 23]{.smallcaps}

> *1.1 System Design Features 23*
>
> *1.2 Layout 23*
>
> *1.3 Component Design Features 23*

[2.0 System Performance 24]{.smallcaps}

[3.0 Interfaces 24]{.smallcaps}

> *3.1 Interface Points 24*
>
> *3.1 Interface Requirements 24*

[4.0 Design Basis 24]{.smallcaps}

> *4.1 Standards and Codes 24*
>
> *4.2 Supporting Analysis 24*

[5.0 Design Implementation 24]{.smallcaps}

> *5.1 Prototypes 24*
>
> *5.2 Mock-ups 24*
>
> *5.3 Component Procurement and Fabrication 24*
>
> *5.4 System Assembly, Installation, and Testing 24*

**NBI System Description 24**

[1.0 Design Description 24]{.smallcaps}

> *1.1 System Design Features 24*
>
> *1.2 Layout 25*
>
> *1.3 Component Design Features 25*

[2.0 System Performance 25]{.smallcaps}

[3.0 Interfaces 25]{.smallcaps}

> *3.1 Interface Points 25*
>
> *3.1 Interface Requirements 25*

[4.0 Design Basis 26]{.smallcaps}

> *4.1 Standards and Codes 26*
>
> *4.2 Supporting Analysis 26*

[5.0 Design Implementation 26]{.smallcaps}

> *5.1 Prototypes 26*
>
> *5.2 Mock-ups 26*
>
> *5.3 Component Procurement and Fabrication 26*
>
> *5.4 System Assembly, Installation, and Testing 26*

**[List of Tables]{.underline}**

[HCD-2.1-1 Baseline Requirements 3]{.smallcaps}

[HCD-2.2-1 Upgrade Requirements 4]{.smallcaps}

[ECH-3.1-1 Interfaces with the ECHU System 15]{.smallcaps}

[ECH-3.2-1 ECHU Cooling Water Requirements 15]{.smallcaps}

[ECH-3.2-2 ECHU I/O Requirements 15]{.smallcaps}

[HHFW-3.1-1 Interfaces with the HHFW System 21]{.smallcaps}

[HHFW-3.2-1 HHFW I/O Requirements 22]{.smallcaps}

**[List of FIGURES]{.underline}**

[ECHU-1.2-1 NSTX ECHU System Layout 8]{.smallcaps}

[ECHU-1.3-1 NSTX ECHU Gyrotron Tank configuration 9]{.smallcaps}

[ECHU-1.3-2 NSTX ECHU Power Supply Configuration 11]{.smallcaps}

[ECHU-1.3-3 NSTX ECHU Transmission Line Block Diagram 13]{.smallcaps}

[ECHU-1.3-4 NSTX ECHU Launcher Layout 14]{.smallcaps}

[HHFW-1.2-1 NSTX HHFW System Layout 18]{.smallcaps}

[HHFW-1.2-2 NSTX HHFW Tranmission Line Block Diagram 19]{.smallcaps}

[HHFW-1.2-3 NSTX HHFW Antenna Strap Layout 19]{.smallcaps}

[NBI-1.2-1 NSTX NBI Source Layout in Test Cell 25]{.smallcaps}

[[APPENDIX]{.underline}]{.smallcaps}

[LIST OF REFERENCES]{.smallcaps}

Introduction

This System Design Description (SDD) document describes the design of
the Heating & Current drive Systems (WBS 2X) of the National Spherical
Tokamak Experiment (NSTX), in response to the requirements given in
NSTX-SRD-2X.

A general section covers information which is relevant to the entire WBS
element. Individual subelements of the WBS work scope are covered in
separate sections, namely:

• WBS 21 Electron Cyclotron Heating (ECH) subsystem

• WBS 22 High Harmonic Fast Wave (HHFW) subsystem

• WBS 23 Coaxial Helicity Injection (CHI) subsystem

• WBS 24 Neutral Beam Injection (NBI) subsystem

Figures and Tables are numbered in format X-Y-Z where X=section (i. e.
section abbreviation, e.g. ECH for Electron Cyclotron heating), Y=
paragraph number, and Z= sequence number within that paragraph.

References to the requirements identified herein are cited in the body
of the document using serial numbers preceded by an \"R\" and are listed
in the Appendix

WBS 2X - General Heating & Current Drive System Design Description

**1.0 Design Description**

The Heating & Current Drive WBS Element covers the supply and delivery
of auxiliary (non-ohmic) power to the NSTX plasma.

[1.1 System Design Features]{.underline}

a\. The Heating and Current Drive systems consist of DC power supplies,
energy transformation systems (e.g. rf amplifiers), transmission
systems, and launching systems.

[1.2 Layout]{.underline}

Refer to sections describing individual WBS 2 subelements

[1.3 Component Design Features]{.underline}

Refer to sections describing individual WBS 2 subelements

**2.0 System Performance \[R1\]**

a\. The baseline design of the NSTX Heating and current Drive systems
will satisfy the baseline performance requirements, and will anticipate
the upgrade requirements but not necessarily satisfy them.

b\. Anticipated upgrades include the following:

• ECH start-up upgrade (increased power and duration)

• long pulse CHI

• addition of neutral beams

• long pulse HHFW

[2.1 Baseline Operation]{.underline}

a\. Baseline operation requirements are given in table HCD-2.1-1.

**Table HCD-2.1-1 Baseline Requirements**

  ------------------------------------------------- -------- ------- -----
  Parameter                                         Value    Units   Ref

  ------------------------------------------------- -------- ------- -----

  ------------------------------------------------- -------- ------- -----
  Baseline maximum plasma duration (t)              5.0      sec     1

  ------------------------------------------------- -------- ------- -----

  ------------------------------------------------- -------- ------- -----
  Baseline minimum repetition period (T)            300.0    sec     2

  ------------------------------------------------- -------- ------- -----

  ------------------------------------------------- -------- ------- -----
  RMS factor (sqrt(t/T))                            0.129            

  ------------------------------------------------- -------- ------- -----

  ------------------------------------------------- -------- ------- -----
  Baseline ECH duration                             5.0      msec    

  ------------------------------------------------- -------- ------- -----

  ------------------------------------------------- -------- ------- -----
  Baseline HHFW duration                            5.0      sec     

  ------------------------------------------------- -------- ------- -----

  ------------------------------------------------- -------- ------- -----
  Baseline CHI duration (1/4 sine wave)             10.0     msec    

  ------------------------------------------------- -------- ------- -----

  ------------------------------------------------- -------- ------- -----
  Baseline NBI                                      N/A              

  ------------------------------------------------- -------- ------- -----

  ------------------------------------------------- -------- ------- -----
  Baseline ECH power                                20.0     kW      

  ------------------------------------------------- -------- ------- -----

  ------------------------------------------------- -------- ------- -----
  Baseline HHFW power                               6.0      MW      

  ------------------------------------------------- -------- ------- -----

  ------------------------------------------------- -------- ------- -----
  Baseline CHI current (plasma)                     500.0    kA      

  ------------------------------------------------- -------- ------- -----

  ------------------------------------------------- -------- ------- -----
  Baseline CHI current (external)                   50.0     kA      

  ------------------------------------------------- -------- ------- -----

[2.2 Upgrades]{.underline}

Upgrade parameters are given in Table HCD-2.2-1 below.

2.2.1 ECH upgrades

a\. The ECH power will be increased from 20kW to 200kW, and the pulse
length extended from 5.0mS to 100.0 mS.

2.2.2 HHFW Upgrade

a\. HHFW will have its pulse length extended from 5 secs. to 60 secs.

2.2.3 CHI Upgrades

a\. A first stage upgrade of CHI will allow 5 second pulses by adding a
steady state power supply.

b\. A second stage upgrade would accomodate 60 sec operation.

2.2.4 NBI Upgrade

a\. The NBI upgrade would place the four existing PBX-M beamlines onto
NSTX. Their pulse length would be increased to 60 seconds.

**Table HCD-2.2-1 Upgrade Parameters**

  ------------------------------------- ----------- ----------- -----------
  Parameter                             Value       Units       Ref

  ------------------------------------- ----------- ----------- -----------

  ------------------------------------- ----------- ----------- -----------
  Upgrade Maximum Plasma Duration       60          sec         

  ------------------------------------- ----------- ----------- -----------

  ------------------------------------- ----------- ----------- -----------
  Upgrade Minimum Repition Rate         3600        sec         

  ------------------------------------- ----------- ----------- -----------

  ------------------------------------- ----------- ----------- -----------
  Maximum ECH pulse length              100         msec        

  ------------------------------------- ----------- ----------- -----------

  ------------------------------------- ----------- ----------- -----------
  Maximum HHFW pulse length             60          sec         

  ------------------------------------- ----------- ----------- -----------

  ------------------------------------- ----------- ----------- -----------
  Maximum CHI pulse length              60          sec         

  ------------------------------------- ----------- ----------- -----------

  ------------------------------------- ----------- ----------- -----------
  Maximum NBI pulse length              60          sec         

  ------------------------------------- ----------- ----------- -----------

  ------------------------------------- ----------- ----------- -----------
  Maximum ECH power                     200         kW          

  ------------------------------------- ----------- ----------- -----------

  ------------------------------------- ----------- ----------- -----------
  Maximum HHFW power                    6           MW          

  ------------------------------------- ----------- ----------- -----------

  ------------------------------------- ----------- ----------- -----------
  Maximum CHI current (external)        20          kA          

  ------------------------------------- ----------- ----------- -----------

  ------------------------------------- ----------- ----------- -----------
  Maximum CHI current (plasma)          200         kA          

  ------------------------------------- ----------- ----------- -----------

  ------------------------------------- ----------- ----------- -----------
  Maximum NBI power                     5           MW          

  ------------------------------------- ----------- ----------- -----------

**3.0 Interfaces**

[3.1 Interface Points]{.underline}

Refer to sections describing individual WBS 2 subelements.

[3.1 Interface Requirements]{.underline}

Refer to sections describing individual WBS 2 subelements

**4.0 Design Basis**

[4.1 Standards & Codes]{.underline}

a\. The NSTX Heating and Current Drive Systems will be designed,
constructed, and installed in compliance with the applicable provisions
of the following:

1\) PPPL Health & Safety Manual, ES&H -5008

2). Others as listed in DoE Order 5480.4, ES&H Protection Standards,
including:

-Title 40 CFR 110,112 EPA Regulations on Discharge of Oil and Oil
Pollution Prevention

-Title 42 U.S.C. 4901, Et. Seq., \"Noise Control Act of 1972\"

-National Fire Codes

-Product Directories of Underwriters Laboratories

-Title 29 CFR 1910, Occupational Safety and Health Standards

-Title 29 CFR 1926, Safety and Health Regulations for Construction

-ANSI/NFPA 70-(latest edition) National Electrical Code

-ANSI C20-(latest edition) National Electric Safety Code

[4.2 Supporting Analysis]{.underline}

Refer to sections describing individual WBS 2 subelements

**5.0 Design Implementation**

[5.1 Prototypes]{.underline}

Refer to sections describing individual WBS 2 subelements

[5.2 Mock-ups]{.underline}

[Refer to sections describing individual WBS 2 subelements]{.underline}

[5.3 Component Procurement and Fabrication]{.underline}

Refer to sections describing individual WBS 2 subelements

[5.4 System Assembly, Installation, and Testing]{.underline}

Refer to sections describing individual WBS 2 subelements

**WBS 21 - ECH Baseline System Design Description**

LATER

WBS 21 - ECH Upgrade System Design Description

**1.0 Design Description**

[1.1 System Design Features]{.underline}

a\. The ECH upgrade system is composed of the following components:

• Existing 28 GHz gyrotron, socket and oil tank provided by ORNL

• Existing series-pass voltage regulator provided by ORNL

• Existing magnet power supplies provided by ORNL

• Existing 100 kV 60 μF capacitor bank provided by PPPL

• New charging supply provided by ORNL

• Waveguide run from gyrotron to NSTX utilizing existing components
provided by ORNL

•New waveguide launcher provided by ORNL.

[1.2 Layout]{.underline}

a\. The capacitor bank, power supplies and gyrotron will be located on
the third floor of the rf building in rooms (TBD)

b\. The waveguide run will be from the gyrotron tank in room (TBD) to
the NSTX machine in the test cell.

c\. The launcher will be mounted on the NSTX machine.

d\. The controls will be integrated through the existing ICRF PLC on the
second floor of the rf building

e\. The overall layout is shown in Figure ECHU-1.2-1

**Figure ECHU-1.2-1**

![](media/image2.pct){width="5.986111111111111in"
height="8.48611111111111in"}

[1.3 Component Design Features]{.underline}

a\. The 28 GHz, 200kW, 100 ms consists of a TE02 mode gyrotron tube
(Varian VGA-8050M) and associated magnet, socket and waveguide hardware.
This equipment is available at ORNL. For full power operation a -80 kV,
8A well regulated beam power supply is required. In addition the
gyrotron magnet requires four 30V, 500A (15kW) magnet power supplies.
The gyrotron tank and associated hardware is shown in figure ECHU-1.3-1

**FIGURE ECHU-1.3-1**

![](media/image3.pct){width="5.333333333333333in"
height="7.083333333333333in"}

b\. The gyrotron beam power supply will utilize a series pass regulator
capable of supplying -80 kV at 8A. The regulator utilizes an Eimac X2062
Tetrode and contains a crowbar. The regulator is available from ORNL

c\. The regulator is supplied from a 100 kV, 60 μF capacitor bank. This
will be provide by PPPL utilizing the existing bank of 20 kV, 60 μF
capacitors in room C41.

d\. The capacitor bank will be charged from a -120kV, 0.1 A charging
supply. This will be purchased and provided by ORNL.

An outline of the gyrotron beam power supply configuration is shown in
figure ECHU-1.3-2

**Figure ECHU-1.3-2**

![](media/image4.pct){width="4.986111111111111in"
height="6.305555555555555in"}

e\. The gyrotron magnet requires four 30V, 500 A power supplies which
exist and will be provided by ORNL.

f\. A waveguide transmission and launching system is used to transport
the power from the source to the tokamak and launch the power into the
vacuum vessel. For this system, a high mode purity, overmoded waveguide
system is proposed which will maximize the power coupling efficiency and
minimize leakage and arcing at the vacuum vessel. The transmission line
length from the proposed gyrotron location to the NSTX vessel is
approximately 30 m long and will require three 90° bends. Circular
waveguide with a diameter of 63.5 mm will be utilized for most of the
transmission line. The transmission mode will be TE02 in some sections
and TE01 for the majority of the length. A two-period ripple wall mode
converter will convert the TE02 gyrotron output power to the TE01 mode.
Corrugated radius bends with optimized curvature will be used for bends.
Several options are available for generating a gaussian-like launch beam
from the TE01 transmission mode near the NSTX end of the waveguide. The
overall transmission efficiency is expected to be 85% or better which
includes 7% mode conversion loss and 7% resistive loss. The transmission
system is shown in outline in figure ECH-1.3-3

g\. At the launcher, a polarized directional launch beam will be
generated using a HE11 mode waveguide antenna and a single focusing
reflector to launch power from the low field-side of the resonance layer
through a mid-plane 300 mm diameter port of the NSTX vacuum vessel. The
launch beam will be linearly polarized and the plane of polarization can
be adjusted to be optimized for O or X mode launch. The approximate beam
width at the resonance zone will be 24 cm. One of the beam launchers
from the ATF experiment at ORNL can be utilized for this application. A
waveguide vacuum window consisting of an edge cooled alumina disc is
located just above the launcher. The launcher configuration is shown in
figure ECHU-1.3-4.

**Figure ECHU-1.3-3**

![](media/image5.pct){width="5.138888888888889in"
height="7.638888888888889in"}

**Figure ECHU-1.3-4**

![](media/image6.pct){width="4.708333333333333in"
height="8.833333333333334in"}

**2.0 System Performance**

**3.0 Interfaces**

[3.1 Interface Points]{.underline}

**Table ECH-3.1-1: Interfaces with the ECHU System**

  ------------ ----------------------------------------------------------
  **WBS**      **Interface Point**

  ------------ ----------------------------------------------------------

  ------------ ----------------------------------------------------------
  11           None.

  ------------ ----------------------------------------------------------

  ------------ ----------------------------------------------------------
  12           Attachment of ECH launcher with Vacuum Vessel

  ------------ ----------------------------------------------------------

  ------------ ----------------------------------------------------------
  13           None

  ------------ ----------------------------------------------------------

  ------------ ----------------------------------------------------------
  3x           Chilled, deionized cooling water supply

  ------------ ----------------------------------------------------------

  ------------ ----------------------------------------------------------
  4x           None

  ------------ ----------------------------------------------------------

  ------------ ----------------------------------------------------------
  5x           AC Input Power

  ------------ ----------------------------------------------------------

  ------------ ----------------------------------------------------------
  6x           Various I/O points, and Safety Interlocks

  ------------ ----------------------------------------------------------

[3.2 Interface Requirements]{.underline}

a\. Cooling water requirements are listed in Table ECHU-3.2-1.

**Table ECHU-3.2-1: ECHU Cooling Water Requirements**

  ----------------- ----------------- ------------------ -----------------
  **Flow (GPM)**    **∆P (PSI)**      **Heat Load        **Heat Load (kW
                                      (Joules/pulse)**   avg.)**

  ----------------- ----------------- ------------------ -----------------

  ----------------- ----------------- ----------------- -----------------
  TBD               TBD               TBD               TBD

  ----------------- ----------------- ----------------- -----------------

b\. Central I&C interface points (input/output sense w/respect to
Central I&C).are listed in Table ECHU-3.2-2.

**Table ECH-3.2-2: ECHU I/O Requirements**

  ---------- ---------- ---------- ---------- ---------- ---------- ----------
  **Anlg     **Anlg     **Dig In** **Dig      **Lo       **Mod      **Hi
  Out**      In**                  Out**      Speed**    Speed**    Speed**

  ---------- ---------- ---------- ---------- ---------- ---------- ----------

  ---------- ---------- ---------- ---------- ---------- ---------- ----------
  TBD        TBD        TBD        TBD        TBD        TBD        TBD

  ---------- ---------- ---------- ---------- ---------- ---------- ----------

Note:

[Low (Lo) Speed]{.underline} ==\> Data Acquisition signals requiring
sample rates \>100 Hz and ≤2 KHz.

[Moderate (Mod) Speed]{.underline} ==\> Data Acquisition signals
requiring sample rates \>2 KHz and ≤100 KHz.

[High (Hi) Speed]{.underline} ==\> Data Acquisition signals requiring
sample rates \>100 KHz and ≤1 MHz.

c\. 480 AC input power shall be supplied to the ECH system. The power
level is TBD kVA, and the power factor is TBD.

**4.0 Design Basis**

[4.1 Standards & Codes]{.underline}

See Heating and Current drive General section

[4.2 Supporting Analysis]{.underline}

Supporting analysis will be performed as required at a later stage in
the design process

**5.0 Design Implementation**

[5.1 Prototypes]{.underline}

None

[5.2 Mock-ups]{.underline}

None

[5.3 Component Procurement and Fabrication]{.underline}

a\. Charging power supply -120 kV, 0.1 A from 480 V AC to be provided by
ORNL.

b\. Fabrication of waveguide launcher

c\. Fabrication of waveguide supports

[5.4 System Assembly, Installation, and Testing]{.underline}

a\. Gyrotron system will be tested at ORNL prior to shipment to PPPL.

b\. Standard PPPL installation and integrated systems test procedures
will be utilized.

**WBS22 - HHFW System Description**

**1.0 Design Description**

The HHFW WBS element covers the generation, transmission, and coupling
of radio-frequency power for heating and current drive to the NSTX
plasma.

[1.1 System Design Features]{.underline}

a\. Generation of radio frequency power will be accomplished by six
existing rf generators and their associated power supplies and cooling
systems. These generators are located in the C-site RF building.

b\. Transmission of radio frequency power will be accommodated by six
runs of 9 inch transmission line from the (existing) switching/dummy
load facilities in the C-site RF building to the NSTX test cell.

c\. Existing switch facilities which permit the routing of radio
frequency power to the PBX-M experimental facility will be maintained.

d\. Transmission line matching and distribution of radio frequency power
to the launching antennas internal to NSTX shall be accomplished with
six sets of tuning stubs and line stretchers, along with associated
decoupling and transmission line elements. Transmission lines, stubs and
stretchers, and decoupling elements shall be gas tight to TBD and
capable of pressurization to TBD psi of sulfur hexaflouride.

e\. Transmission of radio frequency power through the NSTX vacuum vessel
shall be accomplished with 12 vacuum feedthroughs.

f\. Coupling of radio frequency power to the NSTX plasma shall be
accomplished with two antenna sets internal to the NSTX vacuum vessel.
Each antenna set will consist of local protection limiters, Faraday
shields, current straps, radial/toroidal feeders, and a backplane
assembly.

g\. The limiters, Faraday shield and current straps will not be actively
cooled. Cooling at the backplane/vessel wall may be required to remove
heat between pulses.

h\. The final assembly of the antennas will be accomplished in-vessel.

i\. The transmission line external to the vacuum vessel will be
mechanically isolated from the vessel by means of transmission line
bellows assemblies, and electrically isolated from the vessel by means
of DC breaks.

j\. A DC shorting stub will be incorporated into the transmission line
run prior to the point where the line exits the test cell.

[1.2 Layout]{.underline}

The general layout of the HHFW system up to the vacuum vessel interface
is shown in Figure HHFW-1.2-1

**Figure HHFW-1.2-1**

![](media/image7.pct){width="5.777777777777778in"
height="4.805555555555555in"}

a\. The existing layout of the rf generators and associated power
supplies and cooling systems will remain.

b\. The existing switching and dummy load facilities will remain. The
existing transmission line runs to TFTR (D site) will be disconnected in
the C-site switching/dummy load room.

c\. The routing of the 9 inch transmission line runs from the
switching/dummy load room to the NSTX is TBD.

d\. Tuners (tuning stubs and line stretches) are to be located in the
NSTX test cell. Locations TBD. Layout of the transmission lines and
decouplers distributing radio frequency power to the two antenna sets is
TBD.

e\. The twelve vacuum feedthroughs will occupy 12 of 16 off-midplane
six-inch ID flanges located about ports C, D, I, and J. See Figures
HHFW-1.2-2 and HHFW 1.2-3 for port locations.

**Figure HHFW-1.2-2**

![](media/image8.pct){width="5.236111111111111in"
height="4.236111111111111in"}

f\. One antenna set will occupy ports C, D. The second antenna set will
occupy I and J. The layout of the antenna set within each pair of ports
is shown in Figure 3. The plasma facing surface of the antenna set is
defined by the local limiters. The leading edge of the limiters shall
conform to the surface of a torus with major radius 20.32 inches (56.7
cm) and minor radius 40 inches (1.016 m) within ± TBD in.

**Figure HHFW-1.2-3**

![](media/image9.pct){width="5.486111111111111in"
height="2.4444444444444446in"}

**2.0 System Performance**

a\. The baseline design of the HHFW system will satisfy the baseline
performance requirements.

b\. Anticipated upgrades:

• addition of neutral beam injection

• long pulse operation.

The configuration of the antenna sets will accomodate neutral beam
injection, with possible minor modifications. Neither the rf generators
nor the baseline antenna sets will accomodate long pulse operation.

[2.1 Baseline Operation]{.underline}

a\. Baseline operation of NSTX will be pulsed. The HHFW system will
deliver 6 MW to the plasma with a 5 second maximum pulse length and a
300 second minimum repetition period for all three baseline non
inductive discharge scenarios:

• Natural divertor

• Double null X-point divertor

• Single null X-point divertor.

.

b\. The shape of the leading edge of the antenna limiter set as defined
in 1.2 (f) is designed to accomodate a minimum 5 cm gap between the last
closed flux surface for all three baseline non inductive discharge
scenarios.

[2.2 Upgrades]{.underline}

2.2.1 Neutral Beam Injection (NBI) Upgrade

a\. The layout of the antenna set as defined in 1.2 (f) and shown in
Figure HHFW-1.2-1 will accomodate the planned NBI upgrade. The antenna
set will not impinge upon the beam footprint.

2.2.2 Long pulse upgrade

a\. The NSTX long pulse upgrade will have an expected maximum pulse
length of 60 seconds, and a minimum repetition period of 3600 seconds.
The baseline HHFW system will not accommodate long pulse operation.

b\. Upgrade paths to the rf generators, transmission lines, tuning and
matching systems, vacuum feedthroughs, and antenna sets will be
identified.

[2.3 Pulse Repetition Period and Operating Life]{.underline}

a\. The baseline HHFW system will accomodate the target maximum of 100
pulses per 24 hour period.

b\. The rf vacuum feedthroughs and all components of the HHFW system
external to the vacuum vessel will be designed for 10 year operation,
with periodic maintenance and

replacement of transmission line insulators, etc. The antenna sets will
be designed for TBD year operation. Frequent (?TBD) modification of the
antenna set will be acommodated.

c\. The HHFW system will accomodate the following schedule of NSTX
operation - 100 pulses per day, 5 days per week, 3 weeks per month, 9
months per year, for 10 years (total of 135,000 pulses). Non-operating
times are available for maintenance on components external to the vacuum
vessel. In addition, TBD vacuum breaks per year are assumed to permit
maintenance of in-vessel components.

**3.0 Interfaces**

[3.1 Interface requirements]{.underline}

**Table HHFW-3.1-1: Interfaces with the HHFW System**

  ------------ ----------------------------------------------------------
  **WBS**      **Interface Point**

  ------------ ----------------------------------------------------------

  ------------ ----------------------------------------------------------
  11           None.

  ------------ ----------------------------------------------------------

  ------------ ----------------------------------------------------------
  12           Attachment of the antennas to Vacuum Vessel

  ------------ ----------------------------------------------------------

  ------------ ----------------------------------------------------------
  13           None

  ------------ ----------------------------------------------------------

  ------------ ----------------------------------------------------------
  3x           Chilled, deionized cooling water supply

  ------------ ----------------------------------------------------------

  ------------ ----------------------------------------------------------
  4x           None

  ------------ ----------------------------------------------------------

  ------------ ----------------------------------------------------------
  5x           AC Input Power

  ------------ ----------------------------------------------------------

  ------------ ----------------------------------------------------------
  6x           Various I/O points, and Safety Interlocks

  ------------ ----------------------------------------------------------

[3.2 Interface Requirements]{.underline}

a\. Existing cooling for the rf generators is adequate for baseline
operation. Existing cooling for the dummy loads is adequate. No cooling
of the transmission lines, tuning and matching systems, decoupling
systems, in-test-cell rf distribution, or the rf vacuum feedthroughs is
required. Water cooling may be required for the in-vessel areas of the
backplane interfacing to the antenna limiters, current straps, and
Faraday shield. Flow requirements are TBD.

The HHFW system will require additional cooling water for the long pulse
upgrade.

b\. Central I & C requirements:

The HHFW system will require an arm permissive, an enable permissive, a
timing (T=0) pulse, and a plasma permissive.

c\. Interlock requirements:

The existing rf generator interlock system will be retained. In
addition, a kirk key system which locks out the generator system in the
event of test cell access will be required.

d\. Central I&C interface points (input/output sense w/respect to
Central I&C).are listed in Table HHFW-3.2-1.

**Table HHFW-3.2-1: HHFW I/O Requirements**

  ---------- ---------- ---------- ---------- ---------- ---------- ----------
  **Anlg     **Anlg     **Dig In** **Dig      **Lo       **Mod      **Hi
  Out**      In**                  Out**      Speed**    Speed**    Speed**

  ---------- ---------- ---------- ---------- ---------- ---------- ----------

  ---------- ---------- ---------- ---------- ---------- ---------- ----------
  TBD        TBD        TBD        TBD        TBD        TBD        TBD

  ---------- ---------- ---------- ---------- ---------- ---------- ----------

Note:

[Low (Lo) Speed]{.underline} ==\> Data Acquisition signals requiring
sample rates \>100 Hz and ≤2 KHz.

[Moderate (Mod) Speed]{.underline} ==\> Data Acquisition signals
requiring sample rates \>2 KHz and ≤100 KHz.

[High (Hi) Speed]{.underline} ==\> Data Acquisition signals requiring
sample rates \>100 KHz and ≤1 MHz.

e\. 480 AC input power shall be supplied to the HHFW system. With 6MW
delivery to the plasma at an efficiency of 50%, the input power level is
13.3MVA and the power factor is 0.9.

f\. Vacuum vessel interface:

The HHFW system interface to the vacuum vessel requires 6 inch ID
flangement about ports C, D, I, and J, as indicated in Figures 2 and 3.

**4.0 Design Basis**

[4.1 Standards and Codes]{.underline}

See Heating and Current Drive Systems General section

[4.2 Supporting Analysis]{.underline}

Supporting analysis will be performed as required at a later stage of
the design process.

**5.0 Design Implementation**

[5.1 Prototypes]{.underline}

None.

[5.2 Mockups]{.underline}

None planned at present; partial mockups of the antenna set may be
required.

[5.3 Component Procurement and Fabrication]{.underline}

a\. The tuners presently located at the D site RFE in the mockup area
will be demounted and disassembled as necessary and moved to the NSTX
test cell.

b\. Nine inch transmission line elbows, directional couplers, and other
assorted transmission line components located at or near the RFE will be
removed and utilized in the transmission line run from the rf generators
to the NSTX test cell.

c\. Adequate stock of 9 inch transmission line is available to assemble
the transmission line run from the generators to the NSTX test cell,
except for specialized components as stated in 5.3 (b). Disassembly of
the main C-site to D-site transmission line run presently feeding rf
power to TFTR is not expected to be required.

d\. The decoupling system will be fabricated using 6 inch transmission
line components. Requirements over and above existing stock of 6 inch
components TBD.

e\. Twelve 6 inch rf vacuum feedthroughs (from the existing PPPL design)
will be procured.

f\. Twelve 6 inch transmission line DC breaks will be fabricated.

g\. Transmission line bellows for mechanical isolation of the
transmission line from the vacuum vessel will be fabricated, or
transferred from TFTR if the activation level is sufficiently low.

h\. The antenna sets will be fabricated.

i\. RF voltage and phase detectors presently in service on TFTR will be
removed from the test cell basement and utilized in the HHFW system.

[5.4 System assembly, installation, and testing]{.underline}

a\. The rf antenna sets, vacuum feedthroughs, tuning stubs and line
stretchers will be installed after the magnet systems, main tokamak
structure, and passive stabilizing plates are installed. The
transmission line runs external to the test cell may be installed at any
time after TFTR ceases operations.

b\. Procedures will be written to cover system commissioning.

**WBS 23 - CHI System Description**

**1.0 Design Description**

The CHI System is composed of a CHI power supply (WBS 53), a bus
connection to the machine, and a ceramic break in the vacuum vessel
(WBS1).

[1.1 System Design Features]{.underline}

[1.2 Layout]{.underline}

[1.3 Component Design Features]{.underline}

**2.0 System Performance**

**3.0 Interfaces**

[3.1 Interface Points]{.underline}

[3.1 Interface Requirements]{.underline}

**4.0 Design Basis**

[4.1 Standards and Codes]{.underline}

See Heating and Current Drive Systems General section

[4.2 Supporting Analysis]{.underline}

Supporting analysis will be performed as required at a later stage of
the design process.

**5.0 Design Implementation**

[5.1 Prototypes]{.underline}

None

[5.2 Mock-ups]{.underline}

None

[5.3 Component Procurement and Fabrication]{.underline}

a\. CHI power supply in WBS (53)

b\. Bus work (to be fabricated?)

c\. Ceramic break in Vacuum vessel to be fabricated in (WBS 1)

[5.4 System Assembly, Installation, and Testing]{.underline}

**WBS 24 - NBI System Description**

The NBI system of up to four PBX-M neutral beam injectors is an upgrade

**1.0 Design Description**

[1.1 System Design Features]{.underline}

The injectors will provide 5 MW for 60 seconds

[1.2 Layout]{.underline}

a\. The layout of the NBI sources is shown in figure NBI-1.2-1

**Figure NBI-1.2-1**

b\. The ports allocated for NBI are B,F,H and L.

[1.3 Component Design Features]{.underline}

**2.0 System Performance**

**3.0 Interfaces**

[3.1 Interface Points]{.underline}

[3.1 Interface Requirements]{.underline}

**4.0 Design Basis**

[4.1 Standards and Codes]{.underline}

See Heating and Current Drive Systems General section

[4.2 Supporting Analysis]{.underline}

Supporting analysis will be performed as required at a later stage of
the design process.

**5.0 Design Implementation**

[5.1 Prototypes]{.underline}

None

[5.2 Mock-ups]{.underline}

None

[5.3 Component Procurement and Fabrication]{.underline}

[5.4 System Assembly, Installation, and Testing]{.underline}

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height="3.0833333333333335in"}