Cryomodule prototype Yun He, Dan Sabol, Joe Conway On behalf of Matthias Liepe, Eric Smith, James Sears, Peter Quigley, Tim O’Connell, Ralf Eichhorn, Georg Hoffstaetter

Prototype cryomodule 2 Differences of Prototype Module from Linac Module Flange-to-flange length: 10.4 m Prototype moduleLinac module Cryogenic feedingFront cryo-feed cap Side cryo-feed module Cryogenic pipingWith flange/elbow pre-welded Straight Welded in-situ Wire position monitorYesNo Connection between HGRP & 2 phaseMiddle & endMiddle SC magnets/BPMsNoYes Beamline warm-cold transitionYesNo Intermodule unitReplaced by end capYes Cryo-feed cap End cap Yun HE, MLC External Review10/3/2012

3 End caps for prototype testing Cryo-feed cap End cap Cryo feed head from heat exchanger Bellows section allows for displacements of beamline at cold Vertical: 1.2 mm Longitudinal: 8 mm (half length) Blanked off HGRP 5K (supply & return) 1.8 K 40 K return 40K delivery & supply lines connected by ½” tubing Yun HE, MLC External Review10/3/2012

Yun HE, MLC External Review4 Cooling pipes Flanges/elbows to connect to cryo-feed head are pre-welded

Heat treated CuBe wire ( ɸ 0.5 mm) is stretched parallel to the beam axis providing a position reference Sensors attached to end flange of cavity LHe vessel For prototype module only Mounted on end cap flanges (room temperature), thus the wire position is not influenced by cool-down A WPM sensor consists of four striplines spaced 90° apart 5 Wire position monitor Two sensors for 1 st, 3 rd, 5 th cavities One sensor for each of the rest three cavities Yun HE, MLC External Review10/3/2012

6  For prototype, a second connection provides cooling of the second half section of HGRP  Will add a bellows section  This applies to the last cryomodule in the linac string Cooling of 2 nd half of HGRP for prototype module Yun HE, MLC External Review10/3/2012

7 Beamline warm-cold transitions for prototype Gate valves will be at 80 K Replacement of SC magnets Warm-cold transition Will have two-bellows in each pipe Yun HE, MLC External Review10/3/2012