1. SRF Section
Cuvée 2014

2. SRF section LHC – SRF (Machine + Spares)
HIE-ISOLDE (Cavities + Modules + PM)
HL-LHC (CRAB) – SPS testing
SPL – High Gradient Research
FCC
R&D – Cryolab
SRF infrastructure & CRISP
Collaborations & TTC

3. RF-SRF 2015

4. Snapshot of Projects Work
SPL cavity 001: Alick&team trying to break the 3 MV/m barrier – now seems to perform
LHC SRF system: Pierre&co. re-commissioning for start-up – mostly ok. Cavity production proceeding. Spares recovery launched.
HIE-ISOLDE: QS05 for cold testing. SM18 module assembly team around Mathieu working hard. Walter preparing for yet another review.
Crab: After intense testing and workshop now time for reflection on programme
Snapshot of Projects Work
K.M. Schirm on behalf of BE-RF-SRF
RF Annual – Dec. 12th; 2014

5. LS1 SRF Module Swap

6. LHC UNIT19
K.M. Schirm on behalf of BE-RF-SRF

7. HIE-ISOLDE first set of 5 (+1) Nb/Cu cavities
Phases of HIE ISOLDE cavity processing at CERN, LLRF controllers, fundamental coupler, tuning system, test cryostat, performance curves of the first 6 series cavities

8. Cryo module assembly
View of the assembly area with the two ISO5 clean rooms, lifting frame, particle counting, insertion of thermal shield into vacuum vessel

9. Crab crossing
4 Rod Crab cavities IR

10. Post HL-LHC Review Conclusions (May 2014)
SPS Test is of Crab cavity Prototypes is critical
at least one cryomodule before LS2, possibly two, of different cavity type.
additional testing in LHC P4 kept as a possibility but not in the baseline
Crab Cavity prototypes to be tested for the SPS
Concentrate on two designs for testing in the SPS
Double Quarter Wave design
RF Dipole design
SPS Crab cavity Installation
2 cavities of the same type in a common cryomodule
Cryomodules must be easily exchangable
Exchange within an SPS Christmas stop

11. SRF Crab Cavity: Cold testing

12. RFD Test Results
The RFD cavity was tested at Jlab and was able to achieve a voltage far in excess of the specification (acc. phys please do not get excited and increase the required voltage).
The cavity has now been re-tested at CERN and achieved similar results.
TEST I
Q0 = 1.25×1010
@ 2 K (Rs=9.5 nΩ)
TEST II
Q0 = 4.0×109
@ 2 K (Rs=34 nΩ)
Limited by RF Power
Quench

13. DQW test results
The DQW was tested at BNL and achieved above the design spec.
Q was reduced by the beampipe flanges, these have now been coated with Nb and retested at CERN.

14. SRF SPL Activities

15. Teamwork around SPL cold testing

16. Cryolab Activities Cavity Diagnostic Developments with OSTs
S. Aull,
T. Junginger,
B. Peters
Cryolab Activities
Cavity Diagnostic Developments with OSTs
Fundamental SRF studies using the Quadrupole Resonator
New Coating Technologies:
HIPIMS on 1.3 GHz cavities
Collaboration with TE-VSC
S. Calatroni and G. Terenziani
Master Thesis B. Peters (Univ. Karlsruhe) with Co-Supervisor T. Koettig (TE-CRG)
PhD Thesis S. Aull (Univ. Siegen)
Supervisor: S. Doebert
Thanks to the cryolab team for their continued support in 2014!

17. SRF Research in the Cryolab
T. Junginger
S. Aull
SRF Research in the Cryolab
1.3 GHz HIPIMS Cavities
Sample Testing with the
Quadrupole Resonator
High precision tests of HIPIMS cavities
Understanding, controlling and minimizing field dependent losses of Nb/Cu cavities
Effects studied:
Low temperature baking
Thermal cycling
Thermal boundary resistance
140
Surface Resistance [nΩ] 20 40
RF Magnetic Field [mT]
Measurement of the cavity’s
inner surface temperature
RRR does not seem to be the cause of the Q-Slope of Nb Films.
Simultaneous measurement of RS and pressure of helium gas introduced in the cavity as a function of Eacc show that global warming is not the cause for the field dependent surface resistance of Nb/Cu cavities
Cooling Rate [mK/s]
Thermal cycling has a strong impact on the RS.

18. A. Benoit
P. Horn
T. Junginger
B. Peters
Quench detection
OST quench detection system implemented for SM18 cavity cold tests
New Software to locate quenches for any cavity geometry including a new more reliable triangulation algorithm
For enhanced OST resolution and to obtain more information like impact angle from the signals: Fundamental studies to understand the 3 dimensional heat transport in superfluid helium at high heat flux (Master thesis B. Peters in collaboration with TE-CRG)

19. Closing Remarks: SRF section continues growing
2015 will be challenging (again!!!)
Giovanna Vandoni 01/2015
Priority management !
Sorry to all the people (activities) not specifically mentioned here