ERL meeting
02/20/2007

STF status & schedule

Hitoshi Hayano, KEKSTF development plan update
Phase 1 (2005 -2007),for quick startup of ILC SCRF, infra-structure development
subdivided toPhase 0.5 : 1 cavity in each short cryostat (cool down:Mar.2007)
Phase 1.0 : 4 cavities in each short cryostat (cool down:Sep.2007)
Phase 1.5 : replacement of 4? cavities by improved new 4? cavities(cool down:Apr.2008)

Phase 2 (2007 - 2009),
develop ILC Main Linac RF unit
start design Apr. 2007
fabrication in 2008 and 2009
completion end of 2009

GDE S0 task (2006 - 2009)
develop ILC performance cavity

Cryogenic liquefierControl Room

Klystron Gallery

For EP, Clean RoomInfra-structure for SC-RF production

SC Infra-structure
Clean room: in operation for use of short cryomodule assembly.
UPW: in operation.
HPR:under construction. will be completed in Jan. 2007.
EP: under construction. will be completed in Mar. 2007.
CP & acid tank system: will be constructed in JFY2007.
UPW(Ultra-pure Water)EP

Clean room
HPRCPOutline of JFY2006 R&DHigh Gradient Linac
1.

Cavity R&D
TESLA-style 9 cell cavities
two disk window input couplers
slide jack tuners
LL 9 cell cavities
capacitive coupling input coupler
coaxal ball-screw tuners
surface treatment study using LL single cell2.

STF (Superconducting RF Test Facility)
cryomodule assembly
cryogenic tansfer line construction
5MW RF power system
Beam line design and constructionTESLA style Baseline Cavity Package

Total 4 9-cell cavity were fabricated.

TESLA style Baseline Cavity Package#1 Cavity PerformanceTESLA style Baseline Cavity Package#2 Cavity PerformanceTESLA style Baseline Cavity Package#3 Cavity PerformanceTESLA style Baseline Cavity Package#4 Cavity PerformanceTESLA style Baseline Cavity Package
Input Coupler PerformanceLL ICHIRO cavity package for High Gradient

Input Coupler using capacitive couplingat window

Coaxial ball screw tuner
Dia:276mm
Lead: 40mm
Ratio: 21:1

Tuner test standLL ICHIRO cavity package for High Gradient
Gradient Performance

10END groupEacc,max [MV/m]

Qo @ low-field

StatusIchiro#0

Straight BP

29.3

2.0E10

Repaired for S0 study

Ichiro#1

Full

19.5

2.0E10Installed to STF 0.5

Ichiro#2

Full

12.4

1.2E10

Repaired for S0 study

Ichiro#3

FullNot yet measured#1 Cavity go to STF 0.5

11Ichiro#1 9-cell final
Qo10101010980102030
Eacc [MV/m]

4050

Used for tuner test

LL ICHIRO cavity package for High Gradient
Problems found in R&D
Multipacting

Thermal stress @ Nb/SUS bonding

108φ

Problems on Ichiro 9-cell cavities (Ichiro#0, #1 ,#2, #3)
1) Low Q
understood2) Multipacting at tapered beam tube
under testing with single cell cavities
3) Thermal stress on the Nb/SUS bonding
Analyzed4) Too much coupling to fundamental at HOM pickup ports under re-designing5) Field Emission

LL ICHIRO cavity package for High Gradient
Step-I

Improving Steps for New Design
Under electron beam welding,Will be delivered by the end of Feb 2007

80φ

Step-II

Compatible flanges with TESLASame length as the TESLA short

LL ICHIRO cavity package for High Gradient
Input Coupler Performance
By H.Matsumoto and S.KazakovSuccessfully demonstrated
the high power performance
up to 2MW!
The specification: 500kW,
1.5msec, 5Hz@ 45MV/m operation

Cavity treatment study using Single cell
Statistics : 6 Ichiro single cell cavities

Ichiro single cellin EP bed

Cavity Installation into Cryomodule
One TESLA-like Cavity, One LL-type cavity
are installed into STF phase1 cryomodule. (STF Phase 0.5)

TESLA-like Cavity

LL type Cavity

STF phase 0.5 Cryomodule Assembly
Valve Box

He transfer line

connected short cryomodules
cryomodule installation
has being done from Oct. 30,2006.

insertion of cold mass into cryomodule vacuum vessel,
in Dec.13,2006.

STF phase 0.5 Cryomodule into Tunnel

carrying down
the cryomodule

cryomodule sit in the tunnelBeam pipe connection

Downstream module installation

RF power source of STF phase 1
Reuse an old TH2104A 5MW klystron, driven by an existing PNC modulator
by adding a bouncer circuit and a new pulse transformer.
with bouncer

Klystron & modulator

without bouncer

5MWTH2104A klystron

Pulse transformer
installation

Klystron & Waveguide

Coupler HP test setup

3MW operation power which is limited by IGBT protection voltage setting

10MW Multi-beam Klystron1 vertical Toshiba MBK was orderedwith collaboration with SLAC.
Delivery will be summer 2007.
KEK will help initial process at Toshiba.
SLAC will receive them, and acceptance test will be done.
10MWToshiba-MBK
E3736#2 Modulator for 5MW and 10MW klystron
Modulator for TH2104A 5MW klystron, and future 10MW MBK test, wasprocured. KEK acceptance test will be in March 2007.
This is bouncer-type modulator with pulse trans.
Klystron & Waveguide