1. MSC Technical Meeting, CERN 27th June 2013
The SPL Cryo-module
V.Parma,
CERN, TE-MSC
MSC Technical Meeting, CERN 27th June 2013

2. Outline Introduction to the SPL study Goals of the SPL cryo-module
General layout & schematic
Supporting system
Active cooled couplers and heat load estimates
Mock-up validation of the supporting system
Cryogenics and cryogens distribution
Contributions and working structure
Cavities status and Infrastructure in SM18
Planning and CMI resources
Summary

3. To fixed target/μ factory
The SPL study at CERN
Initially aimed at LHC luminosity up-grade (LP-SPL): now stopped
Now R&D study for a 5 GeV multi MW power beam, the HP-SPL
Major interest for non-LHC physics: Fixed Target/Neutrino Factory (but also ISOLDEII/EURISOL)
~500 m
5 GeV
Length: ~540 m
Ejection
to Eurisol
High b cryomodules
12 x 8
b=1 cavities
Medium b cryomodule
20 x 3
b=0.65 cavities
5 x 8
6 x 8
TT6 to
ISOLDE
Debunchers
To fixed target/μ factory
From Linac4
0 m
0.16 GeV
110 m
0.79 GeV
186 m
1.4 GeV
~300 m
2.5 GeV
HP-SPL beam characteristics

4. Layout injector complex
SPS
PS2
ISOLDE PS
SPL
Linac4

5. The SPL study: a new orientation
New objective of the SPL study (after Chamonix a first budget cut):
Focus on R&D for key technologies for the high intensity proton source (HP SPL)
In particular:
Development, manufacture and test of high-gradient β=1, 5 cells, 704 MHz cavities
Development, manufacture and test of RF couplers
Testing of a string of 4 β=1 cavities in machine-type configuration:
Need for a short cryomodule for testing purposes

6. Short cryo-module: Goal & Motivation
Design and construct a ½-lenght cryo-module for 4 β=1 cavities (as close as possible to a machine-type cryomodule)
Motivation:
Test-bench for RF testing on a multi-cavity assembly driven by a single or multiple RF source(s)
Enable RF testing of cavities in horizontal position, housed in machine-type configuration (helium tanks with tuners, and powered by machine-type RF couplers)
Validate by testing critical components like RF couplers, tuners, HOM couplers in their real operating environment
Cryo-module-related goals:
Learning of the critical assembly phases:
preparation of a long string of cavities in clean room
alignment/assembly in the cryostat;
Proof-of-concept of the innovative supporting of cavities via the RF couplers
Explore cryogenic operation issues

7. β=1 cryo-module in the linac

8. From 8 to 4 cavities  the Short Cryo-module

9. Short cryomodule: schematic layout
Connection to cryo distribution line
CW transition
RF coupler, bottom left side
Cavity additional support
1.7% Slope (adjustable 0-2%)
Cryo fill line (Y), top left
Technical Service
Module
End
Phase sep.
Now suppressed
Inter-cavity support
Now suppressed

10. SPL Cryo-module Team System/Component/Activity Person(s) in charge Lab
Cavities/He vessel/tuner construction
O. Capatina
T. Renaglia
F. Pillon
N. Valverde
I. Aviles
G. Devanz
CERN, EN-MME
CERN/ESS
CEA-Saclay
SRF, magnetic shielding, Clean-Room activities, RF test stations (SM18)
T. Junginger
K. Shirm
J. Chambrillon
O. Brunner
CERN, BE-RF
RF Power Coupler
E. Montesinos,
Vacuum systems
Cavity Surface preparation
G. Vandoni
S.Calatroni & Co.
CERN, TE-VSC
Cryogenics (& cryo infrastructure SM18)
O. Pirotte
R. Van Weelderen
T. Koettig
CERN, TE-CRG
Survey and alignment
P. Bestman
CERN, BE-ABP
Cryo-module conceptual design
R. Bonomi
P. Coelho
V. Parma
D. Perez
A. Vande Craen
W. Zak
CERN/ESS former
CERN, TE-MSC
CERN former
Cryo-module detailed design & Integration & Cryostat assembly tooling
P. Dambre
P. Duthil
P. Duchesne
S. Rousselot
D. Reynet
CNRS/IPNO-Orsay
Cryo-module Technical Coordination
CERN

11. SPL Cryomodule Workspace
(managed by R.Bonomi)
Cryo-module design presented/discussed in about 15 workshops, reviews and seminars
from 2009 to date (all information available on Indico)

12. The French in-kind (Protocol K/1597/DG) for SPL
CEA-Saclay:
Supply of 8 tuners (all supplied);
Supply of 4+1 He vessels, according to CERN drwgs (contract placed)
RF tests of tuners (in progress)
CNRS-IPNO (Orsay):
Detailed design of cryostat (in progress, to finish end 2013):
Supply of vacuum vessel + ???…(155 kEuro envelope)
Provide fabrication drwgs file for all cryostat components
Detailed design of cryostat assembly tooling (in progress, to finish end 2013):
Supply of fabrication drwgs file (for build-to-print)
CERN will have to procure:
Cryostat parts not supplied by CNRS
Assembly tooling (based on build-to-print drwgs)
and assemble the CM (SMA18)

13. SPL Cryomodule exhibition (CERN, French in-kind meeting, June 2012)

14. Bi-phase helium tube
SS CF UHV DN100
Helium Tank
Bellows
CEA’s tuner
Bulk Niobium 5Cells cavity
Magnetic shielding
Hom Coupler
Inter-cavity support
Double walled tube
RF Power Coupler

15. (P.Coelho)

16. (P.Coelho)

17. Supporting system mock-up (SMI2)
R.Bonomi, P.Coelho (former), A.Vande Craen,
M.Souchet, W.Zak

18. Supporting system mock-up (SMI2)

19. Supporting system mock-up (SMI2)
Aims. Investigate:
Cavity position stability and alignment  Now first (good) results
Sensitivity of cavity adjustment
Thermo-mechanical position stability (LN2)
CD/WU transients
Thermal profiles (rescaling LHe  LN2) on coupler
Active control of T on coupler
Optical Wire Position Monitor

20. Optical Wire Position Monitor (OWPM)
Cavity position monitoring specs:
Static position or slow movements: absolute movements (x,y,z) of each of 4 cavities during steady state operation and cool-down/warm-ups (300-2 K)
Vertical range: 0-2mm
Precision: <0.05mm
Resolution : <0.01mm
Possibly vibration measures (0-1kHz)
This R&D can be useful to other applications for magnets
Stretched wire
Opto-coupler sensors
Last cavity support

21. Photo-interrupter as displacement measurement devices: R&D in progress
First tests in LN2
Multiple interrupters examples
Typical RT response and linearity curves (TJ0006 sensor, 1 mm wire)
(courtesy: J.C.Perez)

22. SC Cavities Parameter Units Beta = 1 (nominal/ultimate)
Cavity bath temperature
[K]
2.0
Frequency
[MHz]
704.4
Accelerating gradient
[MV/m] 25
Quality factor (x10^9), Qo
10/5
R/Q value
570
Cryogenic duty cycle
[%]
4.11/8.22
Dynamic heat load p. cavity
[W]
5.1/20.4
Nominal: 40 mA/0.4 ms beam pulse ; Ultimate: 20 mA/0.8 ms beam pulse.
Typical Qo-Eacc curve
Power dissipation

23. Heat loads estimates (R.Bonomi) Note: Instrumentation not included
STATIC HEAT LOADS
(1) RF off, DWT cool off
(2) RF off, DWT cool on
DYNAMIC HEAT LOADS
(3) RF on, DWT cool on
(4) RF on, DWT cool off
(R.Bonomi)
Note: Instrumentation not included

24. Vacuum vessel (CNRS)
Helium vessel (CEA)
Tuners (CEA)
RF couplers (BE-RF)
Cavities (BE-RF+EN-MME+TE-VSC)
Gate valves (TE-VSC)

26. Vapour cooled RF coupler for SPL
RF couplers with He gas cooled double walled tube
When RF is on, a distributed vapour cooling is essential to contain distributed RF heating (local heat intercepting can hardly provide efficient cooling)

27. Assembly sequence 6- Mounting of the thermal shield
7- Insertion in the vacuum vessel
8- Closing the vacuum vessel
5- Mounting of the coupler cooling line
3- Mounting of the tuners and inter-cavity connections
1- String of cavities outside the clean room
2- Mounting of the magnetic shields
4- Mounting of the cryogenic distribution
Design by CNRS-IPNO (S.Rousselot)

28. Assembly Tooling
Conceptual design in progress

29. 2 parts vacuum vessel Material is low-carbon steel (LHC type)
Vessel as first Earth magnetic shielding for cavities
Flanges in St.steel (304L)
Procurement by IPNO starts end July 2013

30. Mechanical analysis at CNRS
Loads when closing
Effect of a gap at closure
242mm
1.2mm rattrapé par 2 vis contigües
CNRS-IPNO, P.Duchesne, P.Duthil

31. Cold magnetic shield Status: Detailed design validated
Double layer
Coupler side
Tuner side
Design by CNRS-IPNO (S.Rousselot)

32. Cavity vacuum valves
Choice made with TE-VSC (G.Vandoni) valves purchased procured

33. Cryogenic Scheme Short CryomoduleXB X Y C3 C1 L
Additional valves/level gauges
to test feasibility of 2 K supply scheme
Cool down valves;
tests should show if necessary Z

34. Cryogenic distribution
2 phase tube
(line X)
LHe Level gauge
To cold box and SM18
Pumping line (XB)
Vapours collector
Liquid container x y z
Courtesy CNRS-IPNO (S.Rousselot, P.Duthil)

35. Technical Service module: features
Ph.Separator pot
4.5 K vapor generator
reservoir
(with elect.heater)
Last cavity
IC support
DN80 gate valve (single valve)
standard
support
CWT 50 K heat intercept
(views S.Rousselot, IPN-Orsay)

36. Cooling, Filling, level gauges
filling line
(views IPN-Orsay)
Filling line shifted from the cavity bath X Z Y
INLET
OUTLET X Z Y Y Z X

37. Valve box and cryogenic scheme in SM18
Control valves grouped in a single valve box
Valve box needed also for interfacing CM to cryogenic distribution in SM18

38. Valve box Vacuum vessel Vacuum barrier From SM18 To CM Thermal shield
Status:
Conceptual design finished, (to be handed over to CRG for supply)
Valves being ordered by TE-CRG
Heater on the thermal shield will warm up thermal shield helium to the CM needs (50K)
Vacuum vessel
Vacuum barrier
From SM18
To CM
Thermal shield
Courtesy CNRS-IPNO (S.Rousselot, P.Duthil)

39. Cryo-module instrumentation
Choice to be finalised
pending procurement
~100 T gauges
10 Elec.heaters
4 He level gauges
4 Piezos, tuners,HOM
Optical Wire Position Monitor
Pressure gauges

40. Bunker integration studies at CERN
SM18 bunker
RF distribution
Cryo-module
Valve box
Cryo line interface
Study by P. Martinez Yanez and B.Riffaud, EN-MME

41. Bunker integration studies at CERN
Study by P. Martinez Yanez and B.Riffaud, EN-MME
CRYOMODULE 2% INCLINATION
SPECIAL LENGTH CORRESPONDING TO CRYOMODULE ANGLE
Pending work (BE-RF+EN-MME):
Full integration study (access, services, safety evacuation of He, …)
Design and construction of an inclination table (0%-2%) for the cryomodule
Study the opening of the CM top part of vessel for in-situ maintenance and construction of the handling equipment

42. Upgrade of SM18 clean-room
ISO 5
ISO 4
ISO 5
ISO 4
Top view of cleanroom upgrade
Needs:
Upgrade from ISO 7 to ISO 5
Add a new ISO 4 room for HPR operation
Create a external room for cleaning of small parts (flanges, screw...)
Add HPR and UPW production
(J. Chambrillon CERN-BE-RF)

43. I. Aviles & N. Valverde, EN-MME
Niobium cavities-RI
4 niobium cavities under fabrication at RI
Delivery dates: 1st cavity end of June, last cavity end of July
Status: Dumb-bells welded
I. Aviles & N. Valverde, EN-MME

44. I. Aviles & N. Valverde, EN-MME
Niobium cavity at CERN
Spinning of 2 half-cells and 1 beam tube at HEGGLI for testing
Dimensional control by CMM
RF measurements.
I. Aviles & N. Valverde, EN-MME

45. Master planning

46. Human Resources
(as in apt)
Participation of CNRS-IPNO to follow-up of components manufacture (up to ~17 man.months) in discussion
2 FSU (mid 2014-end 2015)
Main Workshop (and “sous-traitance”) for manufacture of tooling

47. Summary Cryo-module design status:
Conceptual design: finished
Detailed design of vacuum vessel: finished, procurement start end July
Detailed design other components: in progress, to be finished by end 2013
Cryo-module assembly tooling status:
Conceptual design in progress
Detailed design to be finished by end 2013
Procurement of cryostat parts
Vacuum vessel  CNRS-IPNO
Other components  CERN (CMI) in 2014
Fabrication of assembly tooling:
By CERN from CNRS-IPNO drwgs
Assembly of cryo-module to start beginning 2015