the spl cryo-module v.parma, cern, te-msc msc technical meeting, cern 27 th june 2013
TRANSCRIPT
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The SPL Cryo-module
V.Parma, CERN, TE-MSC
MSC Technical Meeting, CERN 27th June 2013
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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
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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
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SPS
PS2
SPL
Linac4
PS
ISOLDE
Layout injector complex
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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
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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
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β=1 cryo-module in the linac
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From 8 to 4 cavities the Short Cryo-module
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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
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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
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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)
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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)
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SPL Cryomodule exhibition (CERN, French in-kind meeting, June 2012)
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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
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(P.Coelho)
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(P.Coelho)
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Supporting system mock-up (SMI2)
R.Bonomi, P.Coelho (former), A.Vande Craen, M.Souchet, W.Zak
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Supporting system mock-up (SMI2)
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• 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)
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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
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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
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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
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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)
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Helium vessel (CEA)
Tuners (CEA)
Cavities (BE-RF+EN-MME+TE-VSC)
Gate valves (TE-VSC)
Vacuum vessel (CNRS)
RF couplers (BE-RF)
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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)
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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)
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Assembly Tooling
Conceptual design in progress
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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
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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
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Cold magnetic shieldStatus:• Detailed design validated
Cold magnetic shield Double layer
Coupler side Tuner sideDesign by CNRS-IPNO (S.Rousselot)
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Cavity vacuum valves
• Choice made with TE-VSC (G.Vandoni) valves purchased procured
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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
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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)
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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)
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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)
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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
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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)
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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
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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
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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
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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)
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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
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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
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Master planning
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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)
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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