1. SuRf Lab: (STFC) VTF Infrastructure and Process
SRF Collaboration Meeting: 25/06/2019
Mark Pendleton
Paul Smith
Andy May
Dave Mason
On Behalf of the SuRF Lab Team

2. Run-1 cryogenic performance
~36 hours for shield cooldown to 75K
~6 hours for cavity support insert cooldown to 4.2K

3. Run-1 cryogenic performance
Excellent pressure and temperature stability under static load at 2 K with PID control of 2 K pumps
+/- 0.1 mbar
+/- 1 mK
Stability under dynamic load to be investigated in forthcoming run

4. P02 Q vs T measurements

5. P02 Q vs Eacc Measurements

6. P02 Q vs Eacc Measurements

7. P02 Q vs Eacc Measurements
Same calculation method used as CEA Saclay
Good agreement within expt error bars
Q-10-15%
Eacc-5%
Investigating the heat dissipated on the input probe at high power levels
Series cavities have a Cu probe, whereas prototypes have a Ti probe-3xRs-3 times loss
Radiation survey in progress-
cant complete till P02 on top cradle

8. Radiation Survey Points
Pole outside ESS Office
Bunker wall pointing toward main offices
Top of LHe dewar

9. Preliminary Radiation Survey Cavity P02 middle cradle
RF Power level
Incident
(W)
On the Lid
μS/Hr
On the pole
Bunker Wall
LHe Dewar
Mirion detector In Line
mS/Hr
Mirion Above
Mirion below
46.9
580
0.85 25
0.4
170 40 96
2600
3.2
211
1.5

10. HOMS Cavity P02

11. Cleanroom Update Cleanroom build complete Commissioning and validation
in progress. On - schedule.
HPR final build phase w/c 1st July
2019

12. UPW system installed
Ultra pure water system installation completed on-time and as per specifications.
High pressure works on schedule to complete by
8th July 2019

13. Solution and proposal provided for Series Valve orientation:
Valve orientation requirement at 45 Degree for CEA integration.
Solution utilising 45 Degree elbow- fitted to each series cavity to suit STFC interface
Meets original design spec for STFC modular cleanrooms
RI to procure and install 88 elbows (STFC to implement change with RI)
STFC to receive cavity with elbow installed and capped (Spec. TBA)
STFC will ship to CEA with Elbow removed. (Spec TBA)
CEA will prep and clean DN40 valve for CEA interface connections.
Elbow solution for series cavities

14. High Level SuRf Lab commissioning schedule
Run 2
Run 3
Run 4
Latest Schedule for commissioning with cavities available:
*P01: Current status at CEA for testing mid July STFC TBC.
* H001 First series dressed cavity tested at DESY STFC 28th August 2019
Run 2 (22 – 26 July): De-risk: Rad survey completion (P02 Top cradle)
and High Power Tests ~200W (localised cooling installed on flange)
Run 3 (30 Aug – 26 Sep): P01 + P02 Commissioning
Run 4 (17 – 27 Oct): P01 + P02 + H001 Commissioning
Utilising P01 + P02 + H001 for commissioning and De-risk
SuRf lab to review and update series schedule after Run 3

15. Objectives for Run 2
Use copper block to thermally anchor the flange-reduce temp rise
Do we need to do a phase optimisation at high power
If YES
Perform Phase optimisation-then wait to cool
Perform decay measurement then wait to cool (Like DESY)
Just measure the transmitted power?
If NO
Just measure the transmitted power
Perform Radiation Survey with P02 on top cradle & measure Rad

16. Commissioning and validation with Series cavities
Proposal: 1st Quarter of 2020 will be utilised for
verification and validation of STFC VTF with dressed HB002
+ HB003 + HB004 tested from DESY. Commissioning
times may be shortened dependant on Run3 conclusions.
Di-Phase pipe cutting validation with DESY: HB001 (TBC)
Box validated by STFC cavity production team
Further De-risk testing strategies under consideration

17. Proposed annual testing and maintenance cycle
Run 3 will be used for system optimisation
Target to test 3 Cavities every 2 weeks (system design S.P)
Schedule proposed for the testing over one year cycle
Anticipated 66 tests per year with quarterly and yearly technical stops.
Next steps to define STFC acceptance criteria for full validation

18. Target 2 week Cycle:
Proposed 2 week cycle for
Testing x3 cavities
Linked for mapping resource
Contingency built into the programme to allow cross-over of staff and uncertantites of the testing specifciation/duration
i.e. Cavity processing time cut off 1 hr?
Draft plan under development

19. Cavity workflow: Workstation (WS)

20. SuRF Lab QMS
SuRf Lab Database under development for the STFC cavity workflow

21. Next Steps: Review lessons learnt from Run 1. Adapt Run 2/3
Update processes and procedures
Update plans with new data to meet TA deadline.
QMS: Commission data management system
Completion of the workstations: procurement, installation, commissioning.
Complete planning for the completion of CSI A for series cavities.
5’s type system for the SuRf Lab area
Training of all staff; on the job and collaborator opportunities