MSC Technical Meeting, CERN 27th June 2013 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 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

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

Layout injector complex SPS PS2 ISOLDE PS SPL Linac4

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 & 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

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 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

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

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 seminars from 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)

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

(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)

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

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

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)

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

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

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

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 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)

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 Effect of a gap at closure 242mm 1.2mm rattrapé par 2 vis contigües CNRS-IPNO, P.Duchesne, P.Duthil

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

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

Cryogenic Scheme Short Cryomodule XB 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

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)

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)

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

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 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)

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

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

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

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)

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

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

Master planning

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

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