The SPL Cryo-module
V.Parma, CERN, TE-MSC
MSC Technical Meeting, CERN 27th June 2013
Outline• Introduction to the SPL study• Goals of the SPL cryo-module• 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
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)
Length: ~540 m
Ejec
tion
to
Euris
ol
High b cryomodules
12 x 8b=1
cavities
Medium b cryomodule
High b cryomodules
Ejec
tion
20 x 3b=0.65 cavities
5 x 8b=1 cavities
6 x 8b=1 cavities
TT6
toIS
OLD
E
Debunchers
To fi
xed
targ
et/μ
fact
ory
High b cryomodules
From
Lin
ac4
0 m0.16 GeV
110 m0.79 GeV
186 m1.4 GeV
~300 m2.5 GeV
HP-SPL beam characteristics
~500 m5 GeV
SPS
PS2
SPL
Linac4
PS
ISOLDE
Layout injector complex
The SPL study: a new orientation
New objective of the SPL study (after Chamonix 2010 + 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
Short cryo-module: Goal & MotivationGoal:• 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
β=1 cryo-module in the linac
From 8 to 4 cavities the Short Cryo-module
Short cryomodule: schematic layout
Connection to cryo distribution line
CW transition
RF coupler, bottom left sideCavity additional support
1.7% Slope (adjustable 0-2%)
Cryo fill line (Y), top left Technical Service Module
EndModule
Phase sep.
Inter-cavity supportNow suppressed
Now suppressed
System/Component/Activity Person(s) in charge Lab
Cavities/He vessel/tuner construction
O. CapatinaT. RenagliaF. PillonN. ValverdeI. AvilesG. Devanz
CERN, EN-MMECERN, EN-MMECERN, EN-MMECERN/ESSCERN/ESSCEA-Saclay
SRF, magnetic shielding, Clean-Room activities, RF test stations (SM18)
T. JungingerK. ShirmJ. ChambrillonO. Brunner
CERN, BE-RFCERN, BE-RFCERN, BE-RFCERN, BE-RF
RF Power Coupler E. Montesinos, G. Devanz
CERN, BE-RFCEA-Saclay
Vacuum systemsCavity Surface preparation
G. VandoniS.Calatroni & Co.
CERN, TE-VSCCERN, TE-VSC
Cryogenics (& cryo infrastructure SM18)O. PirotteR. Van WeelderenT. Koettig
CERN, TE-CRGCERN, TE-CRGCERN/ESS
Survey and alignment P. Bestman CERN, BE-ABP
Cryo-module conceptual design
R. BonomiP. CoelhoV. ParmaD. PerezA. Vande CraenW. Zak
CERN/ESSCERN/ESS formerCERN, TE-MSCCERN formerCERN, TE-MSCCERN/ESS
Cryo-module detailed design & Integration & Cryostat assembly tooling
P. DambreP. DuthilP. DuchesneS. RousselotD. Reynet
CNRS/IPNO-OrsayCNRS/IPNO-OrsayCNRS/IPNO-OrsayCNRS/IPNO-OrsayCNRS/IPNO-Orsay
Cryo-module Technical Coordination V. Parma CERN
SPL Cryo-module Team
SPL Cryomodule Workspace
https://espace.cern.ch/spl-cryomodule/default.aspx (managed by R.Bonomi)
Cryo-module design presented/discussed in about 15 workshops, reviews and seminarsfrom 2009 to date (all information available on Indico)
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)
SPL Cryomodule exhibition (CERN, French in-kind meeting, June 2012)
RF Power Coupler
Bulk Niobium 5Cells cavity
Helium Tank
CEA’s tuner
Hom Coupler
Bi-phase helium tube
Magnetic shielding
Inter-cavity support
Bellows
Double walled tube
SS CF UHV DN100
(P.Coelho)
(P.Coelho)
Supporting system mock-up (SMI2)
R.Bonomi, P.Coelho (former), A.Vande Craen, M.Souchet, W.Zak
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
Supporting system mock-up (SMI2)
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)
Stretched wire Opto-coupler sensors
Last cavity support
This R&D can be useful to other applications for magnets
Photo-interrupter as displacement measurement devices:
R&D in progress
Typical RT response and linearity curves (TJ0006 sensor, 1 mm wire) (courtesy: J.C.Perez)
Multiple interrupters examples
First tests in LN2
SC CavitiesParameter Units Beta = 1 (nominal/ultimate)Cavity bath temperature [K] 2.0 Frequency [MHz] 704.4Accelerating 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 curveQoQR
accVPd
/
2
Power dissipation
Heat loads estimates
Note: Instrumentation not included
STATIC HEAT LOADS(1) RF off, DWT cool off(2) RF off, DWT cool onDYNAMIC HEAT LOADS(3) RF on, DWT cool on(4) RF on, DWT cool off
(R.Bonomi)
Helium vessel (CEA)
Tuners (CEA)
Cavities (BE-RF+EN-MME+TE-VSC)
Gate valves (TE-VSC)
Vacuum vessel (CNRS)
RF couplers (BE-RF)
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)
Assembly sequence
1- String of cavities outside the clean room2- Mounting of the magnetic shields4- Mounting of the cryogenic distribution3- Mounting of the tuners and inter-cavity connections 5- Mounting of the coupler cooling line6- Mounting of the thermal shield7- Insertion in the vacuum vessel8- Closing the vacuum vessel
Design by CNRS-IPNO (S.Rousselot)
Assembly Tooling
Conceptual design in progress
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
Mechanical analysis at CNRS
Loads when closing
242mm
1.2mm rattrapé par 2 vis contigüesEffect of a gap at closure
CNRS-IPNO, P.Duchesne, P.Duthil
Cold magnetic shieldStatus:• Detailed design validated
Cold magnetic shield Double layer
Coupler side Tuner sideDesign by CNRS-IPNO (S.Rousselot)
Cavity vacuum valves
• Choice made with TE-VSC (G.Vandoni) valves purchased procured
Cryogenic Scheme Short Cryomodule
EE’ C
C2
XB
X YC3C1
LZ
Additional valves/level gauges to test feasibility of 2 K supply scheme
Cool down valves;tests should show if necessary
Cryogenic distribution
xy
z
Pumping line (XB)
To cold box
and SM18
2 phase tube(line X)
Vapours collectorLiquid container
LHe Level gauge
Courtesy CNRS-IPNO (S.Rousselot, P.Duthil)
Technical Service module: features
4.5 K vapor generatorreservoir (with elect.heater)
standard support
Last cavity IC support
Ph.Separator pot
DN80 gate valve (single valve)
CWT 50 K heat intercept
(views S.Rousselot, IPN-Orsay)
Cooling, Filling, level gauges filling line
X
Z
YY
Z
X
X
Z
Y
Filling line shifted from the cavity bath
INLET OUTLET
(views IPN-Orsay)
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
Valve boxStatus:• 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)
From SM18
To CM
Vacuum barrierVacuum vessel
Thermal shield
Courtesy CNRS-IPNO (S.Rousselot, P.Duthil)
Cryo-module instrumentation
~100 T gauges
10 Elec.heaters
4 He level gauges
4 Piezos, tuners,HOM
Pressure gaugesOptical Wire Position Monitor
- Choice to be finalised- pending procurement
Bunker integration studies at CERN
SM18 bunker
Valve box
RF distribution
Cryo line interface
Cryo-module
Study by P. Martinez Yanez and B.Riffaud, EN-MME
SPECIAL LENGTH CORRESPONDING TO CRYOMODULE ANGLE
Study by P. Martinez Yanez and B.Riffaud, EN-MME
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
Bunker integration studies at CERN
CRYOMODULE 2% INCLINATION
ISO 5 ISO 4
ISO 4 ISO
5
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
Upgrade of SM18 clean-room
(J. Chambrillon CERN-BE-RF)
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
Niobium cavity at CERN
Spinning of 2 half-cells and 1 beam tube at HEGGLI for testing
Dim
ensi
onal
con
trol
by
CMM
RF measurements.
I. Aviles & N. Valverde, EN-MME
Master planning
Human Resources
• 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
(as in apt)
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