3 9 GHz Cryomodule Design Preliminary Design Review

3. 9 GHz Cryomodule Design Preliminary Design Review Tom Peterson, Yun He, Matt Kramp 20 November 2015

Outline Introduction, configuration and layout Documentation list Design overview Summary Additional information Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 2

LCLS-II Linac Physics Requirements Document: “SCRF 1. 3 GHz Cryomodule, ” LCLSII-4. 1 -PR-0146. • Thirty five 1. 3 GHz 8 -cavity cryomodules • Two 3. 9 GHz 8 -cavity cryomodules • Four cold segments (L 0, L 1, L 2 and L 3) which are separated by warm beamline sections. Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 3

LCLS-II cryomodules: top level parameters Cryomodule (CM) Parameters Symbol nom. value Units Cavity operating temperature T cryo 2 K # 9 -cell cavities per cryomodule (1. 3 GHz) Ncav 8 # installed cryomodules (1. 3 GHz) NCM 35 # 3. 9 -GHz cavities per 3. 9 GHz CM 8 # 3. 9 installed GHz cryomodules 2 # installed 1. 3 GHz cryomodules in L 0 NCM 0 1 # installed 1. 3 GHz cryomodules in L 1 NCM 1 2 # installed 3. 9 -GHz cryomodules as linearizer NCMLH 2 # installed cryomodules in L 2 NCM 2 12 # installed cryomodules in L 3 NCM 3 20 Physics Requirements Document: “SCRF 1. 3 GHz Cryomodule, ” LCLSII-4. 1 -PR-0146. Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 4

Documentation: Physics & Gen’l CM requirements Document Reference Number LCLSII 1. 1 PR 0133 LCLSII 4. 1 PR 0146 LCLSII 4. 1 PR 0097 LCLSII PR 2. 4 0496 LCLSII 2. 4 PR 0081 R 0 LCLSII 2. 4 PR 0136 LCLSII 2. 5 FR 0053 LCLSII 4. 5 EN 0226 LCLSII 4. 9 IC 0058 LCLSII 4. 5 EN 0214 Document Title Physics requirements LCLS II Parameters 1. 3 GHz Cryomodule SCRF 3. 9 GHz Cryomodule Magnet Alignment Tolerances Magnets Beam Position Monitor General cryomodule requirements Functional Requirements Specification, "1. 3 GHz Cryomodule" Engineering Specifications Document, “ 1. 3 GHz Cryomodule Technical Description” Engineering Note, “Cryomodule Heat Load” Engineering Note, “Cryogenic System – Cryomodule Design Methodology” Interface Control Document, “Accelerator Systems to Cryogenic Systems” Interface Control Document, "LCLS II Cryomodule External Interfaces" (ED 0002307) Seismic Design Specification for Buildings, Structures, Equipment and Systems: 2014 Engineering Note, “Cryomodule Seismic Design Criteria” Interface Control Document, "Cryogenic Distribution System" Cryomodule Design Heat Flux for Vacuum Failures LCLSII 4. 1 FR 0096 R 0 Functional Requirements Specification, “ 3. 9 GHz Superconducting RF Cryomodule” LCLSII 4. 5 ES 0356 LCLSII 4. 5 EN 0179 LCLS II 4. 5 EN 0186 LCLSII 2. 5 IC 0056 LCLSII 4. 5 IC 0372 SLAC I 720 0 A 24 E 001 Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 5

Documentation: CM components Document Reference Number Document Title LCLSII 4. 5 ES 0411 LCLSII 4. 5 ES 0412 LCLSII 4. 5 ES 0055 LCLSII 4. 5 IC 0237 LCLSII 4. 5 EN 0221 LCLSII 4. 5 ES 0385 LCLSII 4. 5 EN 0222 About cryomodule components Fermilab Engineering Specification, "LCLS II Cryomodule Vacuum Vessel" Fermilab Engineering Specification, "LCLS II Cryomodule HGRP" Engineering Specifications Document, “Fundamental Power Coupler" Interface Control Document, “Fundamental Power Coupler” Engineering Note, “Tuner electro mechanical design” Cryomodule SRF Cavity Tuner Magnetic Shielding: Requirements and Possible Solutions Engineering Note, “A Study of Magnetic Shielding Performance of a Fermilab International Linear Collider Superconducting RF Cavity Cryomodule” Fermilab Engineering Specification, "LCLS II Prototype Cavity Magnetic Shield Specification" Engineering Specifications Document, "Cryomodule Magnet" Engineering Note, “Vacuum System Safety Plan” Interface Control Document, “Fundamental Power Coupler” Engineering Specifications Document, “CM Coaxial Cable and Connectors Specification" Engineering Specifications Document, “Prototype Cryomodule Sensors Specification" Engineering Specifications Document, “Multi pin Connectors" Engineering Specifications Document, “Prototype Cryomodule Sensor Wiring" LCLS II 1. 3 GHz Cryomodule Stand Design LCLS II 1. 3 GHz Cryomodule Transport System LCLS II Magnet Package Design, Fabrication, and tests, May 6, 2014 Cold Button Beam Position Monitor LCLS II Cold BPM Assembly Drawing LCLS II 4. 5 EN 0310 LCLSII 4. 5 ES 0413 LCLSII 4. 5 ES 0355 LCLSII EN 0286 LCLSII 4. 5 IC 0237 LCLSII 4. 5 ES 0414 LCLSII 4. 5 ES 0415 LCLSII 4. 5 ES 0416 LCLSII 4. 5 ES 0417 LCLSII 4. 5 ES 0418 LCLSII 4. 5 ES 0419 Fermilab document LCLSII 4. 5 ES 0403 F 10023160 Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 6

Documentation: CM details, analyses, compliance Document Reference Number Document Title F 10009945 F 10022915 ED 0001152 ED 0001995 ED 0002339 ED 0002337 ED 0002396 ED 0002383 ED 0002112 ED 0002026 ED 0002454 ED 0002638 ED 0002593 ED 0002453 ED 0002406 ED 0002405 ED 0002404 ED 0002962 ED 0002403 ED 0002340 EN 0001803 Fermilab draft document ANL/Fermilab document LCLSII 4. 5 EN 0430 LCLSII 4. 9 EN 0253 LCLSII 4. 9 EN 0255 EN 01774 EN 01748 Cryomodule engineering details, analyses, and compliance documents Assembly, 1. 3 GHz Cryomodule LCLS II (model) LCLS II Prototype Cryomodule P&ID (drawing) Master Spreadsheet 1. 3 GHz CM LCLS II (cryomodule dimensional details) LCLS II CDS Relief System Analysis Fermilab Engineering Note, LCLS II Cryomodule Vacuum Vessel (FESHM conformance) Fermilab Engineering Note LCLS II Vacuum Vessel FEA Structural Analysis Cryomodule vacuum vessel venting calculation Procedure for Support Post Traction Test (Draft) Fermilab Engineering Specification, LCLS II Cryomodule Beam Pipe Copper Plating Assembly Procedure for LCLS II Support Post (Draft) LCLS II 1. 3 GHz Prototype Cryomodule Instrumentation List P&ID (instrumentation) tag name list Inter connect assembly procedures JT valve sizing and flow calculation Cool down valve sizing and flow calculation Cryomodule two phase pipe pressure, vapor velocity, and venting calculation Cryomodule cooldown line pressure, flow, and venting calculation Cryomodule cavity helium circuits Cryomodule two phase pipe valve sizing calculation LCLS II Inter module bellows unit specification Cryomodule piping engineering note (FESHM piping standard) Electric heater sizing, design, implementation engineering note Thermal intercept analyses (ANL effort) Stress Analysis of LCLS II Cryomodule for Seismic Load CDS/Cryomodule What If Analysis CDS/Cryomodule Failure Mode and Effects Analysis Dressed cavity helium vessel engineering note (cavity AES 035, FESHM conformance) Dressed cavity helium vessel engineering note (cavity AES 027, FESHM conformance) Fermilab Engineering Specification, "LCLS II Cryomodule Cold Mass Upper Sub assembly" ED 0003252 Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 7

Documentation: CM other references docs & pubs Document Reference Number Document Title Other reference documents and publications “Notes about the Limits of Heat Transport from a TESLA Helium Vessel with a TESLA report #94 18 (June, 1994). Nearly Closed Saturated Bath of Helium II”, by Tom Peterson, Fermilab O. Kugeler, A. Neumann, W. Anders, and J. Knobloch, Helmholtz Zentrum REVIEW OF SCIENTIFIC INSTRUMENTS 81, Berlin (HZB), 12489 Berlin, Germany, “Adapting TESLA technology for future 074701 (2010). cw light sources using Ho. Bi. Ca. T” "Latest Developments on He II Co current Two phase Flow Studies, " by B. Advances in Cryogenic Engineering, Vol 43 B, pp. Rousset, A. Gauthier, L. Grimaud, and R. van Weelderen, in Advances in 1441 1448 Cryogenic Engineering, Vol 43 B (1997 Cryogenic Engineering Conference). Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 8

Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 9

“First Light”, 1 cryoplant with 2 cryomodule strings CP-1 Early “First Light” CP-2 Normal Beam Operations U tube TL Jumper Connections Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 10

Normal beam operations 2 cryogenic plants with 2 cryomodule strings CP-1 Normal Beam Operations CP-2 Normal Beam Operations U tube Jumper Connections removed Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 11

3. 9 GHz cryomodule (two needed) Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 12

Design strategy Build on successful implementation now in operation at FLASH • Many lessons learned and subsequently applied XFEL experience • LASA, Milano has adapted our design and used us as a resource including test verification • reciprocal collaboration in progress Apply LCLS II 1. 3 GHz CM as much as possible • lower risk, but sequential (series) design process • will supplement plans for Design Verification Common procurements e. g. instrumentation Common transport fixture CMTS can accommodate both types of CM’s Primary design issues • • Tuner (modification to add piezos to existing blade tuner design) RF Power Input Coupler for CW operation Cavity dynamic heat – larger diameter 2 phase chimney Reduce trapped modes – minor change to ends, but not cavity Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 13

3. 9 GHz cryomodule flow scheme Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 14

3. 9 GHz cryomodules – prior experience 4 cavity 3. 9 GHz cryomodule designed and built at Fermilab for FLASH at DESY, in operation. Shown here in the linac. Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 3. 9 GHz cryomodule for XFEL design by INFN 15

3. 9 GHz RF dressed cavity model Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 16

Tuner - design § ‘Slim’ blade tuner design is preferred to minimize significant re engineering of the dressed cavity/helium vessel while providing room for a larger 2 phase chimney § Designed and built by LASA/INFN, Encapsulated piezo Milano for the 3. 9 GHz cavities stack for Fast tuner fabricated for the XFEL project § Modified to allow fast tuning by means of piezo tuners § Encapsulated piezo designed for the LCLS II 1. 3 GHz cavities will well fit for this task § Experienced LLRF & microphonics Modification of the LASA/INFN tuner by team at Fermilab adding 2 encapsulated piezo stacks Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 17

3 rd harmonic cavity Power Coupler Q: TD_SCRFLCLS II3 rd_HarmonicCoupler MAIN COUPLER_ASSEMBLY_3 9 GHZ. sat Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 For LCLS II three modifications of existing design will provide safe margin for operation at 2 k. W cw power: § Shortening antenna to provide Qext~2. 5 e 7 § Decrease length of two SS bellows in inner conductor (warm part) from 20 convolutions to 10 convolutions § 150 microns Cu plating of inner conductor (instead of 30 microns in current design) § Also considering other options for copper 18

3. 9 GHz cryomodule support system Fixed support post Invar rod fixed to HGRP at the location under fixed support post Slide able support post Cavity support system Cavity helium tank anchored to Invar rod Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 19

Constraints in increasing the chimney size • • Tuner ring at edge of helium tank 3 mm for tack welding 14 mm between welds Needle bearing clamps Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 • • Support hanger between chimney and tuner Need to shift cavity string during cold mass assembling

3. 9 GHz cryomodule cavity string (note alternating input coupler positions) Cavity even: F 10048832 Cavity odd: F 10048834 Chimney: ID 60. 198 mm, OD 63. 5 mm Cavity rotated by 180°wrt helium tank 2 phase pipe: ID 97. 3836 mm, OD 101. 6 mm Flange Reducer F 10002532 Φ 38 mm to Φ 78 mm, 18 mm THK 607. 92 mm Chimney tee to HGRP Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 cavity string F 10014812 BPM spool F 10023168

3. 9 GHz cryomodule assembly Less Instrumentation flanges (no magnets) Identical inter module bellows Identical piping Beams Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 6. 1219 m 22

3. 9 GHz cryomodule external physical interfaces Port for roughing pump & gauge Fixed support post Pressure relief Sliding support post 2 Instrumentation ports Insulating vac pump out port 4 couplers on both sides of module 8 pairs of instrumentation ports Survey fiducials On both sides of 2 post ports 2 support feet Module pickup bushing hoist rings Pre cool valve JT Valve Access to cryogenic valve welds to piping lines Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 2 LHe level instrumentation ports

3. 9 GHz cryomodule overall dimensions Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 24

Cryomodule cross sections Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 25

Liquid helium levels in the 2 -phase pipe with LCLS-II tunnel slope ~0. 5% Upstream end Beam Downstream end 5250 mm Shorter cryomodule results in less impact of slope on liquid helium elevation issue in the 2 phase pipe. Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 26

2 K heat in first few cryomodules From LCLScryo. Heat 18 Sep 2015. xlsx 3. 9 GHz cryomodule heat load is incorporated into Cryogenic Heat Load, LCLSII 4. 5 EN 0179 A small revision is required for 3. 9 GHz: 14 cavities operating at 13. 4 MV/m Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 27

3. 9 GHz cryomodule summary LCLS II 3. 9 GHz Harmonic Linearizer consists of two 8 cavity cryomodules Parameter set determined Design issues identified and being addressed Design work begun & accelerating some work • 1. 3 GHz design & commonalities • collaborations – XFEL, ANL, etc. Schedule in place • Driven by Project decisions (after 1. 3 GHz) • 1. 3 GHz effort now focusing on procurements Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 28

Acknowledgments This presentation includes information from many people at Fermilab, Jlab, and SLAC involved in cryomodule design, cryogenic distribution design, and overall cryogenic system design. Special thanks to Camille Ginsburg, Chuck Grimm, Elvin Harms, Yuriy Orlov, and Yuriy Pischalnikov who provided information and slides for this presentation. Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 29

Backup slides, additional information Peterson, 3. 9 GHz CM Design, PDR, 20 Nov 2015 30