1. Cryomodule test stand at ESS site
5th SRF Collaboration Meeting
Emilio Asensi, Test Stand Engineer
With slides of
Wolfgang Hees

2. Contents
TS2 outline
Layout
Interfaces
Organisation
Controls
Test Plans overview
Schedule
Summary

3. TS2 outline
TS2 in Lund shall perform the SAT of the elliptical cavity cryomodules
high-level requirements come from WP5
testing shall include:
reception & preparation
coupler conditioning
cooldown
RF tests up to full power
heat load tests
warm up & prepping for installation
detailed testing procedures to be written by IK partners, WP10 and linac group’s SRF specialists

4. Test Stand Control room
Layout
It consists of a bunker, a prep area, an area for RF equipment and a control room.
Cryogenics and
Test Stand Control room
Cryo Transfer Line
High power RF
equipment
Test bunker
Preparation
Area

5. Interfaces: Installation

6. Interfaces: Operation

7. Organisation: Installation
TS2 installation is coordinated by WP10. The other teams provide:
WP11: cryoplant, transfer line (incl. valve box & warm lines)
WP8 & WP17: HP RF (modulator, klystrons, waveguides, circulators, dummy loads and splitters) and LLRF equipment
WP12: portable clean room (inst. & removal of beam vacuum pump), insulation vacuum pump, cryo line purging pump
ICS: controls, timing system, motion control (CTS), PSS (access control, radiation & ODH monitoring)
WP15: cabling, racks
WP16: cooling water connections, cp air connection
CF: building, utilities
WP5 IKC partners (CEA & IPNO, France): advice and support
AD linac group: support on SRF issues

8. Organisation: Operation
TS2 operation is organised by WP10. Other teams provide:
WP11: cryoplant operation, support during CM cooldown
WP8: RF engineers to operate RF equipment during tests
WP12: clean room operation, connection of pumps
ICS: database for test data storage
IFJ PAN (In-Kind partner): specialists for CM handling, preparation, connection, testing (experience from XFEL)
WP5 IKC partners (CEA & IPNO, France): advice and support
AD linac group: support on SRF issues and with testing

9. Cryomodule controls at TS2
CRYOGENICS
VACUUM RF
Physical device
PLC (together)
MTCA
Process definition
ESS SRF Experts
ESS Cryo Experts
ESS Vacuum Experts
ESS RF Experts
ESS Test Stand team
Implementation
IPNO
ESS Control Experts
EPICS integration
Operation
IFJ PAN
Communication
EPICS

10. Test Plans overview
Testing of CMs includes a number of preparatory steps, the testing itself and a number of post-processing steps. This list of tasks is preliminary and will be expanded:
Reception:
Cold LP cavity tests:
Inspection for damage, obvious manufacturing errors and completeness of delivery
piezo capacitance measurement (before and during cooldown)
Preparation for test bench:
microphonics measurement
Preparation for installation on test bench, including adjustments as well as mounting and dismounting of parts (door knobs, beam vacuum pumps, insulation vacuum pump)
piezo scans (cavity detuning transfer function)
4π/5 and 3π/5 mode identification
cavity tuner motor characterization
cavity loaded Q motor characterization
Installation on test bench:
Lorentz force detuning compensation
Moving into the bunker
closed-loop nominal gradient operation
Alignment of the cryo jumper connection
Cold HP RF tests:
Connection of flanges
loaded Q measurements and adjustment
Waveguide connections, cabling connections, coupler cooling connections
cavity gradient calibration
cavity gradient performance measurement
Initial testing:
Heat load measurements:
Diagnostic test, showing status of insulation vacuum, leak tightness of helium circuits, integrity of electrical circuits, proper functioning of instrumentation
Measuring heat loads at different operating conditions
Warm up:
Warm up
Warm RF tests:
Disconnection:
Fundamental mode spectra measurements
Opening cryo connections
Cable calibration
Disconnecting waveguides, cabling, coupler cooling, vacuum pump
Warm coupler conditioning:
Monitoring and pumping of the beam vacuum
Extraction from the bunker
Coupler conditioning, using ramped RF power
Preparation for tunnel
Cool down:
Preparing for transport to tunnel and installation.
System checking to assure it is purged and clean
Cool down following a predetermined ramp
Maintain cold He flow to assure operating temperature of cavities

11. Schedule
Installation in 2017 with first tests of medium beta cryomodules in 2018,
high beta cryomodules to be tested starting middle 2019.
2017
2018 1 2 3 4 5 6 7 8 9 10 11 12
Partial access
Full access
Utilities available
RF inst. and comm.
Cabling inst.
Controls comm.
Bunker inst.
TL and Cryo inst.
PSS inst. and comm.
MB-ECCTD CM
MB-Series CM
IFJ PAN: Preparations
2018 1 2 3 4 5 6 7 8 9 10 11 12
MB-ECCTD installation
MB-ECCTD commissioning
MB-ECCTD testing
MB CM 1 installation
MB CM 1 testing and SERIES
IFJ PAN: commissioning
IFJ PAN: phase 1 starts (testing medium beta CMs)

12. Summary
TS2 in Lund performs the SAT of the elliptical cavity cryomodules. High-level requirements come from WP05. Collaborative work is a must.