+--------------------+----------------------+-------+-----------------+
| **Princeton Plasma |                      |       |                 |
| Physics            |                      |       |                 |
| Laboratory**       |                      |       |                 |
|                    |                      |       |                 |
| **NSTX             |                      |       |                 |
| Experimental       |                      |       |                 |
| Proposal**         |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| **Title: Plasma    |                      |       |                 |
| re-fueling with    |                      |       |                 |
| Supersonic Gas     |                      |       |                 |
| Jet**              |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| **OP-XP-626**      | > **Revision:**      | >     |                 |
|                    |                      |  Effe |                 |
|                    |                      | ctive |                 |
|                    |                      | >     |                 |
|                    |                      | Date: |                 |
|                    |                      | >     |                 |
|                    |                      | > *   |                 |
|                    |                      | (Ref. |                 |
|                    |                      | >     |                 |
|                    |                      | OP-AD |                 |
|                    |                      | -97)* |                 |
|                    |                      | >     |                 |
|                    |                      | >     |                 |
|                    |                      | Expir |                 |
|                    |                      | ation |                 |
|                    |                      | >     |                 |
|                    |                      | Date: |                 |
|                    |                      | >     |                 |
|                    |                      | > *(2 |                 |
|                    |                      | >     |                 |
|                    |                      |  yrs. |                 |
|                    |                      | > u   |                 |
|                    |                      | nless |                 |
|                    |                      | >     |                 |
|                    |                      |  othe |                 |
|                    |                      | rwise |                 |
|                    |                      | > st  |                 |
|                    |                      | ipula |                 |
|                    |                      | ted)* |                 |
+--------------------+----------------------+-------+-----------------+
| **PROPOSAL         |                      |       |                 |
| APPROVALS**        |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| **Author: V. A.    |                      |       | > Date          |
| Soukhanovskii**    |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| **ATI -- ET Group  |                      |       | > Date          |
| Leader: R.         |                      |       |                 |
| Maingi**           |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| **RLM - Run        |                      |       | > Date          |
| Coordinator: R.    |                      |       |                 |
| Raman, S. Sabbagh  |                      |       |                 |
| (Deputy)**         |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| **Responsible      |                      |       |                 |
| Division:          |                      |       |                 |
| Experimental       |                      |       |                 |
| Research           |                      |       |                 |
| Operations**       |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| [**Chit Review     |                      |       |                 |
| Board**            |                      |       |                 |
| (designated by Run |                      |       |                 |
| Coordin            |                      |       |                 |
| ator)]{.underline} |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| **MINOR            |                      |       |                 |
| MODIFICATIONS**    |                      |       |                 |
| (Approved by       |                      |       |                 |
| Experimental       |                      |       |                 |
| Research           |                      |       |                 |
| Operations)        |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
|                    |                      |       |                 |
+--------------------+----------------------+-------+-----------------+

NSTX EXPERIMENTAL PROPOSAL

Plasma re-fueling with Supersonic Gas Jet OP-XP-626

#  Overview of planned experiment 

The goal of the experiment is to complete the evaluation of fueling
properties of the supersonic gas injector (SGI) - essentially to
complete XP 516 started last year. In FY05 progress has been made in
parts 3.1 and 3.2 of XP 516 (the attached). This experiment will address
and slightly expand on tasks from pars 3.2 and 3.3, as described below.

#  Experimental run plan

> The experiment is comprised of three parts which can be executed
> separately and on different dates. Part one addresses the SGI fueling
> efficiency in the plasma start-up phase, part two addresses the SGI
> fueling efficiency in the flat-top phase and compares it directly to
> low field side conventional gas injectors, and H-mode access with SGI
> is studied in part three. Required diagnostics are the MPTS and
> FIReTIP. Desired diagnostics include fast cameras with a view of the
> supersonic gas jet at Bay I.
>
> 2.1 Use of SGI for initial density ramp in the front-end of discharge
> (up to 5 shots)

-   Use a suitable 1-3 source NBI LSN target plasma. Use LFS Injector \#
    2 or 3 for initial density ramp-up (front-end) for a reference case.
    Replace the LFS injector with an identical SGI pulse. Note the
    density ramp rate. The SGI will be parked at the optimal (or closest
    possible to LCFS) major radius in all shots*.* SGI setup: plenum
    pressure *P~0~*=2500 Torr.

-   Repeat two times to assure reproducibility

> 2.2 SGI fueling efficiency in the flat-top phase (up to 5 shots)

-   Use a suitable 1-3 source NBI LSN target plasma. Use LFS Injector \#
    2 or 3 for gas puffing. Add a 50 - 100 ms gas pulse at 70 Torr l / s
    from an LFS injector during an H-mode phase. Replace the LFS
    injector with an identical SGI pulse. Note the density development.
    The SGI will be parked at the optimal (or closest possible to LCFS)
    major radius in all shots. SGI setup: plenum pressure
    *P~0~*=2000-2500 Torr.

-   Repeat two times to assure reproducibility

2.3 H-mode access with SGI (up to 6 shots)

-   Use a suitable 1-3 source NBI LSN target plasma with HFS fueling.
    Assure good wall conditioning and reproducible H-mode access. Obtain
    a reference H-mode discharge using HFS injector. Replace the HFS
    injector gas with an SGI gas pulse.

-   Repeat a pair of the reference discharge followed by an SGI fueled
    discharge for three SGI rates: 30, 50, 70 Torr l /s.The SGI pulse
    start time is 0.100 - 0.150 s, duration 0.400 s

+--------------------+----------------------+-------+-----------------+
| **Princeton Plasma |                      |       |                 |
| Physics            |                      |       |                 |
| Laboratory**       |                      |       |                 |
|                    |                      |       |                 |
| **NSTX             |                      |       |                 |
| Experimental       |                      |       |                 |
| Proposal**         |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| **Title: Plasma    |                      |       |                 |
| re-fueling with    |                      |       |                 |
| Supersonic Gas     |                      |       |                 |
| Jet**              |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| **OP-XP-516**      | > **Revision:**      | >     |                 |
|                    |                      |  Effe |                 |
|                    |                      | ctive |                 |
|                    |                      | >     |                 |
|                    |                      | Date: |                 |
|                    |                      | >     |                 |
|                    |                      | > *   |                 |
|                    |                      | (Ref. |                 |
|                    |                      | >     |                 |
|                    |                      | OP-AD |                 |
|                    |                      | -97)* |                 |
|                    |                      | >     |                 |
|                    |                      | >     |                 |
|                    |                      | Expir |                 |
|                    |                      | ation |                 |
|                    |                      | >     |                 |
|                    |                      | Date: |                 |
|                    |                      | >     |                 |
|                    |                      | > *(2 |                 |
|                    |                      | >     |                 |
|                    |                      |  yrs. |                 |
|                    |                      | > u   |                 |
|                    |                      | nless |                 |
|                    |                      | >     |                 |
|                    |                      |  othe |                 |
|                    |                      | rwise |                 |
|                    |                      | > st  |                 |
|                    |                      | ipula |                 |
|                    |                      | ted)* |                 |
+--------------------+----------------------+-------+-----------------+
| **PROPOSAL         |                      |       |                 |
| APPROVALS**        |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| **Author: V. A.    |                      |       | > Date          |
| Soukhanovskii**    |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| **ATI -- ET Group  |                      |       | > Date          |
| Leader: R. Kaita** |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| **RLM - Run        |                      |       | > Date          |
| Coordinator: J.    |                      |       |                 |
| Menard, S. Sabbagh |                      |       |                 |
| (Deputy)**         |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| **Responsible      |                      |       |                 |
| Division:          |                      |       |                 |
| Experimental       |                      |       |                 |
| Research           |                      |       |                 |
| Operations**       |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| [**Chit Review     |                      |       |                 |
| Board**            |                      |       |                 |
| (designated by Run |                      |       |                 |
| Coordin            |                      |       |                 |
| ator)]{.underline} |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
| **MINOR            |                      |       |                 |
| MODIFICATIONS**    |                      |       |                 |
| (Approved by       |                      |       |                 |
| Experimental       |                      |       |                 |
| Research           |                      |       |                 |
| Operations)        |                      |       |                 |
+--------------------+----------------------+-------+-----------------+
|                    |                      |       |                 |
+--------------------+----------------------+-------+-----------------+

NSTX EXPERIMENTAL PROPOSAL

Plasma re-fueling with Supersonic Gas Jet OP-XP-516

# 1. Overview of planned experiment 

Supersonic gas injector (SGI) has been developed and commissioned on
NSTX in FY04. The aim of this experiment is to study

-   fueling characteristics of the SGI

-   edge and core plasma response to supersonic gas injection

-   compatibility of the supersonic gas jet fueling with an H-mode
    plasma edge

-   SGI diagnostic potential for cold-pulse transport experiments and
    helium edge spectroscopy

> In the first part of the experiment, the SGI fueling efficiency and
> edge plasma characteristics will be evaluated for a reproducible
> injection of the supersonic deuterium jet in an ohmic and NBI-heated
> L-mode plasma, the LCFS -- nozzle distance will be varied, and the SGI
> will be used for the plasma ramp-up phase development. In the second
> part of the experiment, supersonic D~2~ injections will be performed
> in an H-mode plasma (ELM-free and/or ELMy). The latter part of the
> experiment may be done on a different day. It is planned to model the
> results of the experiment with the two-dimensional edge fluid code
> UEDGE and the neutral transport MC code DEGAS 2.

# 2. Theoretical/ empirical justification

> A new method for re-fueling a high temperature fusion plasma with a
> supersonic gas jet has been developed on the HL-1M tokamak \[1\] and
> later implemented on several nuclear fusion plasma facilities \[2,
> 3\]. The method favorably compares to the conventionally used fueling
> methods: subsonic gas injection at the plasma edge, and high velocity
> cryogenic fuel pellet injection into the plasma core. Fueling
> experiments with supersonic gas jets have demonstrated a fueling
> efficiency of 0.3 - 0.6, reduced interaction of injected gas with
> in-vessel components, and therefore a higher wall saturation limit.
> Several models have been used to explain the enhanced penetration of
> the supersonic jet into the plasma: a cold channel model \[4\], an
> electrostatic double-layer shielding model \[4\], and a rapid plasma
> cooling leading to the increase in the ionization and dissociation
> length together with the polarization ExB drift \[5\]. High density
> and directionality of the supersonic gas jet enable a larger fraction
> of the injected gas to ionize and reduce the contact of neutrals with
> material surfaces. However, the benefits of this new fueling method
> may be downgraded by its incompatibility with the high performance
> plasma regimes, namely the H-mode plasmas, and common auxiliary
> heating methods, such as the radio-frequency waves.
>
> The NSTX SGI is mounted on the vacuum vessel port slightly above the
> midplane. It is comprised of a graphite nozzle and a modified Veeco
> PV-10 piezoelectric valve. A graphite shroud protects the assembly
> from the plasma. Integrated in the shroud are a flush-mounted Langmuir
> probe and two small magnetic coils for Br and Bz measurements. The
> assembly is mounted on a Thermionics movable vacuum feedthrough
> controlled by a PC. The SGI operates at room temperature. The
> performance of the supersonic nozzle has been characterized in a
> laboratory setup. Highly collimated gas jet profiles were measured,
> and M=4 Mach number was obtained from the impact pressure measurements
> \[6, 7\] using the supersonic Releigh-Pitot law. Initial NSTX SGI
> results obtained in the end of FY04 campaign are encouraging: SGI
> demonstrated high gas jet collimation, good SOL penetration, and
> compatibility with plasma operations \[8\].
>
> In the present experiment, the SGI fueling efficiency will be
> evaluated for a variety of plasma conditions. The fueling efficiency
> is defined as
>
> $$h = \frac{\frac{\text{dN}}{\text{dt}}}{G_{\text{gas}}}$$
>
> where *N* is the inventory of particles (ions or electrons), and
> *Γ~gas~* is the gas injection rate. The proposed experiment should
> help in understanding the mechanism of the supersonic gas jet
> penetration into a magnetized plasmas.

# Experimental run plan

## Measurements and optimization of the SGI fueling efficiency in ohmic L-mode plasmas (10-13 shots)

-   Setup an ohmic plasma, LSN with PF2L, both strike points on the
    floor, *T~f~* = 4.5 kG, *I~p~*=0.6-0.8 MA, no CS injector,
    *R~sep~*=150-154 cm. Example shot: 112813. Setup: 2-3 shots

-   Use 10-15 Min He GDC between shots. Helium shots may be necessary to
    run for every 7-10 deuterium shots to de-saturate the walls.

-   Inject D~2~ from SGI in the flat-top phase as follows: pulse
    duration 70-120 ms, injection rate 50-60 Torr l / s (plenum pressure
    *P~0~*=2000 Torr). Start with SGI head parked at R=160 cm and scan
    the SGI position by 1-2 cm inward. Bring the SGI head to within 1 cm
    of separatrix location (from EFIT). An IDL routine is used to
    calculate SGI-LCFS distance for the given *R~SGI~* and EFIT
    equilibrium (Figure 1). Shot count: 8-10 shots.

## H-mode tolerance to SGI, H-mode flat-top fueling optimization and H-mode access with SGI (10-12 shots)

-   Two main prerequisites: NBI is commissioned and H-modes are
    reproducibly obtained

-   Setup an ELM-free or small ELM H-mode with CS gas injector fueling,
    B~t~=0.45 T, I~p~=0.8 MA, 2 NBI sources, LSN PF2L configuration.
    Shot example: 111543. (2 shots)

-   Add SGI during an H-mode phase. SGI setup: plenum pressure
    *P~0~*=2000 Torr, pulse duration 100-200 ms. Start at
    *R~SGI~*=*R~LCFS~*+2 cm. Perform an SGI drive scan by increasing
    R~SGI~ by 1-2 cm. Shot count: 4 shots

-   Replace the CS injector gas form by the SGI injector gas form and
    repeat for three SGI plenum pressures: 1000 Torr, 1500 Torr and 2000
    Torr. Shot count 4 shots.

## Use of SGI for initial density ramp in the initial discharge phase (Optional, time permitting, up to 5 shots)

-   Use the same ohmic shot scenario as in 3.1. Use Injector \# 1 for
    initial density ramp-up. Add SGI during current ramp-up phase. Note
    the density ramp rate. The SGI will be parked at the optimal (or
    closest possible to LCFS) *R.* SGI setup: plenum pressure
    *P~0~*=2000 Torr. Try two fueling scenarios:

    -   Add an SGI pulse 100-200 ms duration, start at 30-80 ms

    -   Use best results from above and continue fueling with CS
        injector (plenum pressure 1000 -- 1200 Torr)

> Note: Major radius of LCFS of example shot 112813 at 33 ms is at 139.8
> cm, about 20 cm from the expected SGI position. The supersonic gas jet
> remains well collimated and penetrates well through a 20 cm wide SOL,
> as followed from the FY'04 SGI experiments.

![](media/image1.png){width="3.6069444444444443in"
height="3.792361111111111in"}

Figure 1. Example of SGI-LCFS distance calculation for shot 111543 at
300 ms

# 4. Required machine, NBI, RF, CHI and diagnostic capabilities

Completed Physics Operations Request and Diagnostic Checklist are
attached.

Prerequisite conditions:

-   Supersonic gas injector XMP-36 has been run and the SGI is
    commissioned

-   Fast camera (Canadian Photonics, Kodak or Phantom) is available and
    mounted on Bay L port window

-   NBI and H-mode access conditions are needed for part 3.3 of the
    experiment.

# 5. Planned analysis

We plan to use DEGAS 2, UEDGE and TRANSP for fueling efficiency and jet
penetration analysis.

# 6. Planned publication of results

Results will be presented at conferences and / or refereed journals as
appropriate.

# References

\[1\] L. Yao et al., Nuc. Fusion 41, 817 (July 2001).

\[2\] B. Pegourie et al., J. Nuc. Mater. 313-316, 539 (2003).

\[3\] J. Miyazawa et al., Nucl. Fusion 44, 154 (2004).

\[4\] J. Yiming, Z. Yan, Y. Lianghua, and D. Jiaqi, Plasma Phys.
Control. Fusion 45, 2001 (2003).

\[5\] J. Bucalossi et. al., in Proc. 29th Int Conf. on Fusion Energy,
Lyon 2002 (IAEA, Vienna, 2002).

\[6\] V. A. Soukhanovskii, H. W. Kugel, R. Kaita, R. Majeski, A. L.
Roquemore, Supersonic gas injector for fueling and diagnostic
applications on the National Spherical Torus Experiment, Review of
Scientific Instruments, October 2004, Volume 75, Issue 10, pp. 4320-4323

\[7\] V. A. Soukhanovskii, H. W. Kugel, R. Kaita, R. Majeski, A. L.
Roquemore, D. P. Stotler, Supersonic gas jet for fueling experiments on
NSTX, Paper P2.190,  Proceedings of the 31st EPS Conference on Plasma
Physics, 28 June - 2 July 2004, London, United Kingdom

\[8\] V. A. Soukhanovskii, H. W. Kugel, R. Kaita, A. L. Roquemore, First
results from NSTX supersonic gas jet fueling experiments, NSTX FY 2004
Results Review, 20-21 September 2004, Princeton, New Jersey .
http://nstx.pppl.gov/DragNDrop/Results_Review_04/Soukhanovskii-RR04/

PHYSICS OPERATIONS REQUEST

Plasma re-fueling with Supersonic Gas Jet OP-XP-516

Machine conditions for parts 3.1 and 3.3

> I~TF~ (kA): **-52.5** Flattop start/stop (s): **-0.02 / 1.0**

I~P~ (MA): **0.8** Flattop start/stop (s): **0.18 / 0.37**

Configuration: **Inner Wall / Lower Single Null / Upper SN / Double
Null**

> Outer gap (m): **0.1**, Inner gap (m): **0.055-0.070**
>
> Elongation κ: **1.85-1.95**, Triangularity δ: **0.4-0.5**
>
> Z position (m): **0.00**
>
> Gas Species: **D / He**, Injector: **Midplane and SGI**
>
> NBI - Species: **D**, Sources: **None**, Voltage (kV): **\_\_\_\_\_**,
> Duration (s): **\_\_\_\_\_**

ICRF -- Power (MW): **\_\_\_\_**, Phasing: **Heating / CD**, Duration
(s): **\_\_\_\_\_**

CHI: **Off**

*Either:* List previous shot numbers for setup: **112813**

![](media/image2.png){width="5.08125in" height="4.004861111111111in"}

Machine conditions for part 3.2

> I~TF~ (kA): **-52.5** Flattop start/stop (s): **-0.02/1.0**

I~P~ (MA): **0.8** Flattop start/stop (s): **0.08/0.6**

Configuration: **Inner Wall / Lower Single Null / Upper SN / Double
Null**

> Outer gap (m): **0.1**, Inner gap (m): **0.05-0.10**
>
> Elongation κ: **2**, Triangularity δ: **0.55**
>
> Z position (m): **0.00**
>
> Gas Species: **D / He**, Injector: **Midplane / Inner wall /SGI**
>
> NBI - Species: **D**, Sources: **A/B**, Voltage (kV): **80**, Duration
> (s): **0.6**

ICRF -- Power (MW): **\_\_\_\_**, Phasing: **Heating / CD**, Duration
(s): **\_\_\_\_\_**

CHI: **Off**

*Either:* List previous shot numbers for setup: **111543**

![](media/image3.png){width="5.915277777777778in" height="4.65in"}

DIAGNOSTIC CHECKLIST

Plasma re-fueling with Supersonic Gas Jet OP-XP-516

+-----------------+---------------+---------------+------------------+
| #### Diagnostic | #### Need     | #### Desire   | #                |
|                 |               |               | ### Instructions |
+-----------------+---------------+---------------+------------------+
| > Bolometer -   | >            |               |                  |
| > tangential    |               |               |                  |
| > array         |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Bolometer     | >            |               |                  |
| > array -       |               |               |                  |
| > divertor      |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > CHERS         | >            |               |                  |
+-----------------+---------------+---------------+------------------+
| > Divertor fast | >            |               |                  |
| > camera        |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Dust detector |               | >            |                  |
+-----------------+---------------+---------------+------------------+
| > EBW           |               |               |                  |
| > radiometers   |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Edge          |               |               |                  |
| > deposition    |               |               |                  |
| > monitor       |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Edge pressure | >            |               |                  |
| > gauges        |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Edge rotation | >            |               |                  |
| > spectroscopy  |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Fast lost ion |               |               |                  |
| > probes --     |               |               |                  |
| > IFLIP         |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Fast lost ion |               |               |                  |
| > probes --     |               |               |                  |
| > SFLIP         |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Filtered 1D   | >            |               |                  |
| > cameras       |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Filterscopes  | >            |               |                  |
+-----------------+---------------+---------------+------------------+
| > FIReTIP       | >            |               |                  |
+-----------------+---------------+---------------+------------------+
| > Gas puff      |               |               |                  |
| > imaging       |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > High-k        |               |               |                  |
| > scattering    |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Infrared      | >            |               |                  |
| > cameras       |               |               |                  |
+-----------------+---------------+---------------+------------------+
| >               |               |               |                  |
|  Interferometer |               |               |                  |
| > -- 1 mm       |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Langmuir      | >            |               |                  |
| > probes - PFC  |               |               |                  |
| > tiles         |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Langmuir      |               |               |                  |
| > probes - RF   |               |               |                  |
| > antenna       |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Magnetics --  |               |               |                  |
| > Diamagnetism  |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Magnetics --  | >            |               |                  |
| > Flux loops    |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Magnetics --  |               |               |                  |
| > Locked modes  |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Magnetics --  | >            |               |                  |
| > Pickup coils  |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Magnetics -   | >            |               |                  |
| > Rogowski      |               |               |                  |
| > coils         |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Magnetics -   |               |               |                  |
| > RWM sensors   |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Mirnov coils  | >            |               |                  |
| > -- high       |               |               |                  |
| > frequency     |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Mirnov coils  |               |               |                  |
| > -- poloidal   |               |               |                  |
| > array         |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Mirnov coils  |               |               |                  |
| > -- toroidal   |               |               |                  |
| > array         |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > MSE           |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Neutral       | >            |               |                  |
| > particle      |               |               |                  |
| > analyzer      |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Neutron Rate  |               |               |                  |
| > (2 fission, 4 |               |               |                  |
| > scint)        |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Neutron       |               |               |                  |
| > collimator    |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Plasma TV     | >            |               |                  |
+-----------------+---------------+---------------+------------------+
| > Reciprocating | >            |               |                  |
| > probe         |               |               |                  |
+-----------------+---------------+---------------+------------------+
| >               |               |               |                  |
| Reflectometer - |               |               |                  |
| > FM/CW         |               |               |                  |
+-----------------+---------------+---------------+------------------+
| >               |               |               |                  |
| Reflectometer - |               |               |                  |
| > fixed         |               |               |                  |
| > frequency     |               |               |                  |
| > homodyne      |               |               |                  |
| > quadrature    |               |               |                  |
+-----------------+---------------+---------------+------------------+
| >               |               |               |                  |
| Reflectometer - |               |               |                  |
| > homodyne      |               |               |                  |
| > correlation   |               |               |                  |
+-----------------+---------------+---------------+------------------+
| >               |               |               |                  |
| Reflectometer - |               |               |                  |
| > HHFW/SOL      |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > RF antenna    |               |               |                  |
| > camera        |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > RF antenna    |               |               |                  |
| > probe         |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Solid State   |               |               |                  |
| > NPA           |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > SPRED         | >            |               |                  |
+-----------------+---------------+---------------+------------------+
| > Thomson       | >            |               |                  |
| > scattering -  |               |               |                  |
| > 20 channel    |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Thomson       | >            |               |                  |
| > scattering -  |               |               |                  |
| > 30 channel    |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Ultrasoft     | >            |               |                  |
| > X-ray arrays  |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Ultrasoft     |               |               |                  |
| > X-ray         |               |               |                  |
| > arrays - 2    |               |               |                  |
| > color         |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Visible       | >            |               |                  |
| >               |               |               |                  |
|  bremsstrahlung |               |               |                  |
| > det.          |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > Visible       | >            |               |                  |
| > spectrometers |               |               |                  |
| > (VIPS)        |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > X-ray crystal |               |               |                  |
| >               |               |               |                  |
|  spectrometer - |               |               |                  |
| > H             |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > X-ray crystal |               |               |                  |
| >               |               |               |                  |
|  spectrometer - |               |               |                  |
| > V             |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > X-ray PIXCS   |               |               |                  |
| > (GEM) camera  |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > X-ray pinhole |               |               |                  |
| > camera        |               |               |                  |
+-----------------+---------------+---------------+------------------+
| > X-ray TG      |               |               |                  |
| > spectrometer  |               |               |                  |
+-----------------+---------------+---------------+------------------+