1. XFEL cavities and cryomodules measurements at AMTF
Mateusz Wiencek

2. Outline Levels of SRF cavities commisioning AMTF overview
Single cavities checks and measurements at warm
Single cavities measurements at 2K
Preparation of the cryomodule at warm
Cold test of the cryomodule
Dedicated tools
Measurements data handling
Error handling during the tests
Summary
M. Wiencek, 6th SRF Collaboration LASA

3. Levels of SRF cavities commisioning
Single cavity test
QvsE
Cavities tests in the cryomodules
Flat - top
Cavities checks in the acceleartor
First from 32 cavities quench
M. Wiencek, 6th SRF Collaboration LASA

4. Amtf (Accelerator module test facility)
M. Wiencek, 6th SRF Collaboration LASA

5. Single cavity checks and measurements at room temperature
Incoming inspection:
Measurement of fundamental mode spectrum (IO: input -pickup)
Shortcut test
Preparation for test
HOM rejection filter tuning and fundamental mode spectrum measurement (IO: input – pickup, input - HOM2, pickup – HOM1)
RF cable connection with TDR
M. Wiencek, 6th SRF Collaboration LASA

6. Cavity measurements at 2k
Test – stand calibration
Calibartion of the RF cables attenuation (reflection measurement on input, cold loop cable used for cold part of the cables)
QvsE curve
At least two curves for each cavity
Additionally: HOM Spectra measurements for some of the cavities
M. Wiencek, 6th SRF Collaboration LASA

7. Preparation of the module for cold test...
Incoming inspection:
Fundamental mode spectra for each cavity
Check of the cavities tuners
Check of the coupler movers
Shortcut test
Piezo check
T-sensors check
Additional checks if needed
M. Wiencek, 6th SRF Collaboration LASA

8. ...Preparation of the module for cold test
Warm coupler conditioning
M. Wiencek, 6th SRF Collaboration LASA

9. Cold test of the cryomodule...
Low power measurements:
Cold cable attenuation
Fundamental mode spectra at 2K
Cavity tuning to resonance frequency
HOM Spectra measurement
M. Wiencek, 6th SRF Collaboration LASA

10. ...Cold test of the cryomodule – High RF power
High power measurements:
Cryomodule calibration
Flat – top measurement
Heat Loads measurement
LLRF measurements
M. Wiencek, 6th SRF Collaboration LASA

11. ...Cold test of the cryomodule – High RF power
Cryomodule calibration
M. Wiencek, 6th SRF Collaboration LASA

12. ...Cold test of the cryomodule – High RF power
Flat – top measurement
M. Wiencek, 6th SRF Collaboration LASA

13. ...Cold test of the cryomodule – High RF power
Heat Loads measurement
M. Wiencek, 6th SRF Collaboration LASA

14. Dedicated tools - amtf meas system
History of each component
Decisions on components
Measurement data
Vacuum data
...
M. Wiencek, 6th SRF Collaboration LASA

15. Measurements data handling - VNA
RAW FILES (peak plots in RAW format, text files)
AMTF DB (Only peaks,transmitions and one spectrum)
XFEL DB (only peaks and transmiissions)
M. Wiencek, 6th SRF Collaboration LASA

16. Measurements data handling – Test stand measurements
RAW FILES (RF pulses, environment variables etc... stored)
AMTF DB (measurement and diagnostic data)
XFEL DB (most important data only)
M. Wiencek, 6th SRF Collaboration LASA

17. Error handling during the tests
Components problems:
NCR for cavities and cryomodules
In-situ repairs
Decisions concerning components
Infrastructure problems:
Hardware failures:
Very important issue: each hardware component which is used have to have responsible person
Scheduled maintenance:
Have to be included in every long – term scheduling
M. Wiencek, 6th SRF Collaboration LASA

18. summary
1217 vertical test (QvsE) have been done for 815 unique cavities
107 cold test of the cryomodules have been done for 100 unique cryomodules
Collaboration is the key for success
Define as many things as possible during preparation phase saves a lot of time in the future
M. Wiencek, 6th SRF Collaboration LASA