CW Cryomodules for Project X Yuriy Orlov, Tom Nicol, and Tom Peterson Cryomodules for Project X, 14 June 2013Page 1

Design Requirements and Challenges Minimize vibration and coupling of external sources to cavities. Ensure good pressure stability to reduce microphonics. Provide good cavity and magnet alignment (~0.5 mm RMS). Provide removal of up to ~25 W per cavity at 2.0 K per cryomodule. Protect helium and vacuum spaces from exceeding allowable pressures. Provide ~5 K and ~80 K intercepts (no 5 K thermal shield, only intercept flow). Design must perform reliably after repeated thermal cycles. Provide excellent magnetic shielding for high Q 0. Minimize construction and operational costs. Conform to applicable functional requirements and Fermilab engineering and safety standards. Cryomodules for Project X, 14 June 2013Page 2

Initial Configuration Concept Stand-alone cryomodules. Warm-to-cold transitions at each end. Internal cold magnetic elements in low beta region. External magnetic elements and beam line instrumentation in warm space between cryomodules in high beta region. 2.0 K – 4.5 K heat exchanger at each cryomodule. Cool-down and operational control valves at each cryomodule. Quick disconnect and cryomodule removal using bayonet-style transfer line connections. Access ports for tuner repair or replacement. Cryomodules for Project X, 14 June 2013Page 3

650 MHz (ß=0.9) Cryomodule End flanges with beam pipe (~100mm-ID) Heat exchanger & check valve Bayonet connections and cryogenic valves Power couplers Ports for access tuner motors Support posts Vacuum vessel (pipe: 48”-OD Cryomodules for Project X, 14 June 2013Page 4

650MHz Cryomodule Layout Overall length (CS-Flange to Flange)-12415mm (8)/9477mm (6) Number of cavitis-8 (6) Distance between couplers-1468mm 1 gate valve for each end of beam pipe (cold) Number of support posts-3 (1-fixed, 2-sliding) 300mm pipe (concept) serves as strong back, as the 2-phase helium pipe, provides a large vapor buffer volume for pressure stability and enables the use of existing tooling (Big Bertha). Heat exchanger + check valve Insulation vacuum relief valve Page 5Cryomodules for Project X, 14 June 2013

650MHz (ß=0.9) Cold Mass 300mm pipe with support bearing system for cavity string Invar rod (keeps the z-distance between cavities) Thermal shrinkage compensator (bellows) Cavity string with cold gate valves Page 6Cryomodules for Project X, 14 June K shield with Al extrusions not shown 5K piping with thermal intercepts (Blade tuners were replaced by end-lever tuners.) (we are plan to use transition joint between Ti-St. Steel.)

SSR1 Cryomodule Page 7Cryomodules for Project X, 14 June 2013 End flanges with beam pipe (~40mm-ID) Power couplers Tuner access ports Solenoid Current leads Heat exchanger and Check valve Bayonet connections, cryogenic valve control system Optical windows

SSR1 Cryomodule Layout Page 8Cryomodules for Project X, 14 June 2013 Overall length (CS-Flange to Flange)-5300mm Number of resonators-8 Numbers of solenoids-4 Resonator spacing-450/800mm Solenoid spacing-1250mm Beam pipe ID-40mm 1 gate valve for each end of Beam Pipe (warm) Number of support posts-12 (1 per resonator/solenoid) Warm strong back Heat exchanger & check valve 2-phase pipe

SSR1 Cold Mass Page 9Cryomodules for Project X, 14 June phase He pipe Cavity-solenoids string with GV on the ends Current leads with intercept 5K piping with thermal intercepts 80K shield with Al extrusions (top not shown) Al strong back with support post’s

Page 10Cryomodules for Project X, 14 June 2013 Thank You!

Back-up slides 11Cryomodules for Project X, 14 June 2013

Design considerations – thermal Removal of large 2 K heat load within 2 K heat flux limits Cooling arrangement for integration into cryo system –Temperature and pressure levels for supply and return Large dynamic heat load implies less emphasis on minimizing static (passive) heat load –No 5 Kelvin thermal radiation shield –However, keep 5 Kelvin thermal circuit for 5 K thermal intercepts on input couplers, intercepts on warm-cold transitions, etc. –Closed vacuum vessel ends, warm-cold transitions Options for handling 4.5 K (or perhaps 5 K - 8 K) thermal intercept flow and nominally 70 K (typically in range 30 K to 80 K) thermal intercept flow –Pipe routing and thermal intercept conductive element design, avoid dynamic thermal effects on support structure Cryomodules for Project X, 14 June 2013Page 12

Design considerations – cryo piping Pipes must be sized for –Steady-state heat transport (2.0 K heat flux limits) – heat transport to 2.0 K liquid surface may set helium port diameter –Steady-state helium flow, low pressure drops –Non-steady-state conditions, e.g., emergency venting Low allowable pressure on RF cavity may be significant constraint on piping due to high volumetric flows for loss of vacuum venting Vapor velocity over liquid in the 2-phase system must be low so as not to entrain liquid droplets (<5 meters/sec) Cryomodules for Project X, 14 June 2013Page 13

TESLA CM for reference Cryomodules for Project X, 14 June 2013 Provides nomenclature for pipes Page 14

650 MHz Cryomodule cooling scheme Page 15Cryomodules for Project X, 14 June 2013 HX

SSR Cryomodule Cooling Scheme Cryomodules for Project X, 14 June 2013Page 16

SSR1 Cryomodule Functional Requirements Specification Cryomodules for Project X, 14 June

SSR1 Cryomodule (section) Cryomodules for Project X, 14 June 2013Page 18

SSR1 Cryomodule. Strong Back assembly `1 Cryomodules for Project X, 14 June 2013Page 19

SSR1 Cryomodule. Cavity String Cryomodules for Project X, 14 June 2013Page 20

SSR1 Cryomodule. Cavity String Cryomodules for Project X, 14 June 2013Page 21

CM650MHz Cryomodule (section) Cryomodules for Project X, 14 June 2013Page 22