1. ESS – RF checks up to cavity operation readiness in tunnel
Cecilia G. Maiano

2. Technical Commissioning of Systems
After the handover from In-Kind Contributors, the testing at TS and tunnel installation the technical commissioning phase will start at ESS
In this presentation an overview of the
“checkpoints” for the monitoring of the cavity frequencies during their lifetime (i.e. has something happened during transport?)
“reference values” to asses whether the cavities in cryomodules are fitting the operation frequency goal within the normal tuner action.

3. Cavities Flow (MB) High Q Configuration FPC Configuration INFN
Ref f at warm
Out
CEA
ESS TS2
Out In In
CM Measurements In
DESY
Out
Assess
ESS Linac
Ref f at cold
VT Measurements
Oper f

4. Frequency checks (MB) – Before String
Outgoing control from INFN (or Vendor) to DESY. INFN
Warm spectrum and transmissions (+HOM)
First set of reference f data
Define & agree on reference condition for acceptance at warm
Incoming control at DESY. INFN
Warm spectrum and transmissions (+HOM)
Data acquired during tests at DESY. INFN
Cold spectrum and transmissions (+HOM)
Reference condition for acceptance at cold
Cold measurement results
Outgoing control from DESY to CEA. INFN
Incoming control at CEA. CEA
Warm spectrum and transmissions (+HOM) (No Tuner)

5. Frequency Checks (MB) – After String
Outgoing control from CEA. CEA
Warm spectrum and transmissions (+HOM) (Tuner installed)
Doorknob not installed! Tool
Incoming inspection at TS2. ESS
Before and after Doorknob
Let’s stop here, but then there is a huge ESS workflow for testing and send to tunnel.
(Discussion in next SRF Collaboration meetings)

6. Transmission measurements
Agree on “standard” measurement sequence
All fundamental passband modes
Each mode acquired with a SPAN of ~200 kHz
If possible, calibrated transmission values (at least for the accelerating mode, better if all)
No specific format enforced (.txt, .xls… etc. => HDF5)
Consolidation in HDF DB at ESS
But data need to exchanged with the cavity, to allow incoming/outgoing assessments

7. Frequency preparation strategy

8. Mbeta SRF “manual”