1. Construction and First Coo-down Test of cERL Injector Cryomodule
E. Kako, Y. Kondo, S. Noguchi, T. Shishido, Y. Yamamoto, K. Watanabe
(KEK, SC-Cavity Gr.)
K. Hara, T. Honma, Y. Kojima, H. Nakai, K. Nakanishi
(KEK, Cryogenic Gr.)
H. Hitomi, K. Sennyu (MHI, Mihara)
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

2. OUTLINE Design Feature of cERL Injector Cryomodule Cryomodule Assembly
First Cool-down Test :
(Low RF power measurements)
4. Summary
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

3. OUTLINE Design Feature of cERL Injector Cryomodule Cryomodule Assembly
First Cool-down Test :
(Low RF power measurements)
4. Summary
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

4. Injector Cryomodule for cERL (1)
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

5. Injector Cryomodule for cERL (2)
Ibeam = 100 mA, Ebeam = 10 MeV for 3GeV-ERL
Required RF input power = CW 180 kW / coupler
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

6. OUTLINE Design Feature of cERL Injector Cryomodule Cryomodule Assembly
First Cool-down Test :
(Low RF power measurements)
4. Summary
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

7. Assembly of Injector Cryomodule (1)
April 25th, 2012
Exchange of RF feedthroughs
Cavity string assembly in clean room
Attachment of input couplers
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

8. Alignment of three cavities
Assembly of Injector Cryomodule (2)
Alignment of three cavities
Assembly of slide-jack tuner system
Assembly of 2K-He line
Installation of 5K-He panels
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

9. Assembly of Injector Cryomodule (3)
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

10. OUTLINE First Cool-down Test ; (Low RF power measurements)
a. Cool-down procedure
b. Temperature distribution at 2K
c. Heat load measurement
d. Frequency change
e. Slide-jack tuner performance
f. Piezo tuner performance
g. Input-phase adjustment
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

11. History of cool-down (1)
Sept. 11 (Tue)
17:00 Measurement at 300 K
Sept. 12 (Wed)
10:00 Cool-down / start
19: K Cool-down / stop
Sept. 13 (Thu)
8: K / start
17: K / stop
Sept. 14 (Fri)
8: K / start
17: K / stop
Sept. 15 (Sat)
---
---
Sept. 16 (Sun)
---
---
Sept. 17 (Mon)
---
---
Sept. 18 (Tue)
8: K / start
18: K / stop
Sept. 19 (Wed)
8: K / start
19: K / stop
Sept. 20 (Thu)
8: K / start
16: K ; Measurement at 4.2 K
18:00 / stop
Sept. 21 (Fri)
8: K / start
13: K
16: K ; Measurement at 2.0 K
17:00 / stop
20: K
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

12. History of cool-down (2)
Sept. 23 (Sun)
10: K
15: K
Sept. 24 (Mon)
8: K Cool-down / start
17: K
18: K ; Low RF power tests at 2K
24:00 Cool-down / stop
Sept. 25 (Tue)
8: K / start
10: K
12: K ; Low RF power tests :00 / stop
Sept. 26 (Wed)
8:00 / start
12: K ; Low RF power tests :00 / stop
Sept. 27 (Thu)
8:00 / start
11: K ; Low RF power tests :00 / stop
Sept. 28 (Fri)
8:00 / start
11: K ; Low RF power tests :00 / stop
Sept. 29 (Sat)
9: K natural warm-up without heater
Oct. 01 (Mon)
8: K
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

13. Temperature Distribution at 2K (1)
Temperature sensors :
Cernox = 48
Pt-Co = 12
CC = 36
2.89 K
89.8 K
4.2K-He reservoir panel
for input thermal anchors
68.9 K
5.15 K
3.54 K
3.71 K
5.25 K
70.0 K
90.5 K
Temperature at Input Couplers
(without dynamic loss)
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

14. Temperature Distribution at 2K (2)
HOM-cup
HOM
-connector
Thermal
anchor to 2K
ave. temp. at 15 HOM couplers ;
HOM-cup = 4.16 K, (3.24~6.27 K)
HOM-connector = 6.82 K, (5.69 ~ 9.23 K)
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

15. Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

16. Heat Load Measurement (Preliminary)
Static heat load ; 2K
Static heat load ; 4.2K
ave. 2K heat load = 12 W
(including 2K cold-box = 1 W)
Cryomodule = 11 W at 2K
Estimation = 14 W, including 1 W/coupler (x6),
0.2 W/HOM-cable (x15) and others.
ave. 4.2K heat load = 48 W
(including 2K heat load = 12 W)
Cryomodule = 36 W at 4.2K
Estimation = 33 W, including
3 W/coupler (x6) & 1 W/HOM-cable (x15).
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

17. Frequency change during cool-down
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

18. Frequency change, QL at 2K
No.1 Cavity
No.2 Cavity
No.3 Cavity
T = 300 K
MHz
MHz
MHz
T = 4.2 K
MHz
MHz
MHz
T = 2.0 K
MHz
MHz
MHz
Df = 300K/4.2K
MHz
MHz
MHz
Df = 4.2K/2.0K
- 125 kHz
- 150 kHz
- 141 kHz
Measured QL
1.41 x106
6.23 x105
6.22 x105
(Designed QL)
( 5 x105 )
( 2 x105 )
( 2 x105 )
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

19. Tuner Stroke of #1, #2, #3 Cavity
at 2 K
fo = MHz
D fo = 1.0 MHz/mm
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

20. D f = 2. kHz Piezo Stroke of #1, #2, #3 Cavity
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

21. Measurement of Input Phase vs Pt
3dB
div. RF
source Pt f
f =0
f =0
f = -p
f = +p
f = -p
f = +p
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

22. Schedule for Next Step
Oct. 22 ~ Processing of Input couplers at RT (#1-Cavity)
5Hz, 10ms, 30ms, 100ms, 0.5ms, 2ms, 10ms; 60 kW
2Hz, 50ms; 1Hz, 200ms; 60 kW/coupler
CW, 16 kW/coupler ; finished. (for 20 hours)
Nov. 12 ~ Processing of Input couplers at RT (#2-Cavity)
Dec. 03 ~ Processing of Input couplers at RT (#3-Cavity)
2013’
Jan. 08 ~ 2nd cool-down for high RF power tests
Jan. 21 ~ Low power tests (with WG-system)
Jan. 28 ~ High power tests (#1-Cavity, #2-Cavity)
Feb. 04 ~ High power tests (#3-Cavity, #2&#3-Cavity)
Feb. 09 ~ warm-up
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

23. SUMMARY
Construction of injector cryomodule for cERL was completed, and the cryomodule was successfully cooled down at 2 K.
Low RF power tests at 2 K were carried out, and reasonable heat loads and good tuner performance were confirmed.
High RF power test is scheduled in Jan.-Feb., 2013’.
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab

24. Thank you for your attention.
Eiji Kako (KEK) 2012, Nov. 07
TTC meeting at JLab