US Construction Project: SSs, PRY, Cavities and test program MICE Project Board and RLSR – November 17, 2014 Alan Bross1

Outline Spectrometer Solenoids – Quick update Magnetic mitigation Status of Step IV PRY Cooling step configuration & performance RF Modules – 2 needed for the final MICE step – Status and outlook MICE Project Board and RLSR – November 17, 2014 Alan Bross2

Spectrometer Solenoids MICE Project Board and RLSR – November 17, 2014 Alan Bross Both SSs passed all qualification tests at the vendor, were fully mapped and shipped to RAL. LBNL team scheduled to visit 4/26-5/9 – Final work prior to cool down 3

Step IV Partial Return Yoke Step IV PRY complete – South Wall installed – North & end walls at sea MICE Project Board and RLSR – November 17, 2014 Alan Bross Center sections (independent removal) 4

South Wall install MICE Project Board and RLSR – November 17, 2014 Alan Bross Installation took ~ 3 1/2 days Some issues with access – Into hall – Interference with S. Mezzanine No major issues, however North & end walls will not have in- hall access issue 5

PRY Performance: Steel Comparison with JFE-EFE (targeted values) Measured Target Mechanically PRY meets all specs Performance then depends on – Steel – Reliability of simulations MICE Project Board and RLSR – November 17, 2014 Alan Bross6

Comparison with JFE-EFE (targeted values) Important for shielding performance MICE Project Board and RLSR – November 17, 2014 Alan Bross7

Field at R1.5m (Beam Height) MICE Step IV 240 MeV Flip MICE Project Board and RLSR – November 17, 2014 Alan Bross8

Machined vs. Un-machined Several samples cut and measured by KJS Associates, Indiana Machining does change material properties Waterjet-cutting was sensible decision MICE Project Board and RLSR – November 17, 2014 Alan Bross9

Machined+Annealed vs. Unmachined Annealing restores properties MICE Project Board and RLSR – November 17, 2014 Alan Bross10

Step IV PRY Conclusions JFE-EFE steel performs exactly as expected With our own data on magnetic properties of the steel, performance will meet expectations No stray-field issue in the Hall and certainly NONE anywhere within the ISIS facilities MICE Project Board and RLSR – November 17, 2014 Alan Bross11

Cooling Demo PRY Straightforward extension of Step IV configuration MICE Project Board and RLSR – November 17, 2014 Alan Bross12

MICE Project Board and RLSR – November 17, 2014 Alan Bross Blue – 5G Red – 10G 13

PRY Extension for Cooling Demo There are no engineering issues w/r to the mods needed for the PRY for final step. Steel for extension has been ordered – Delivery (FOB Philadelphia) now July (2 months early) Wall extension straightforward extrapolation from Step IV design Need for “Top-Hat” not likely – Vacuum issue with RF module appears to be resolved MICE Project Board and RLSR – November 17, 2014 Alan Bross14

RF Modules and Tests

MICE RF Modules MICE Step V’ needs two RF modules Each RF module has – One 201 MHz RF cavity – Two Beryllium windows – Two RF couplers – One vacuum vessel host the RF cavity – Six tuner arms and six actuators – Cavity support struts – Vacuum pump system and water cooling MICE Project Board and RLSR – November 17, 2014 Alan Bross16

RF in MICE The RF modules in the final step in MICE will be near duplicates of the Single Cavity Test System (SCTS) that is currently being used in the MuCool Test Area at Fermilab MICE Project Board and RLSR – November 17, 2014 Alan Bross17

Tests B=0 >350 hrs, >6M pulses 0.5M+ pulses at 11+ MV/m – Dose rate at this gradient < 2 mR/h on-axis at ~ 1.9m from cavity center (and < 0.6 mR/h at ~ 3m) Ran up to ~14 MV/m for short periods – Limited by RF power source stability No breakdown events or other operational issues with the cavity observed Tests in magnetic field beginning this week MICE Project Board and RLSR – November 17, 2014 Alan Bross18

Cavity Bodies Selected four best cavities (two spares) from nine cavity bodies based on inner surface finish & frequency measurements of the cavity bodies and Be windows Four cavities have been Electro-polished (EP) Nine beryllium windows available MICE Project Board and RLSR – November 17, 2014 Alan Bross19

Vacuum Vessel Design RFM Vacuum conceptual design review held on Jan , 2015 at LBNL Design requirements – Good vacuum inside RF cavity ~ Torr – No force on the beryllium windows – Exterior vacuum connecting to the rest of MICE cooling channel ~ to Torr New vacuum vessel design – Isolate cavity vacuum from the external channel – Direct cavity port-pump connection with bellows – Burst disc/pressure valve to protect Be windows 3D model complete, preliminary drawings generated Fabrication readiness review: Apr. 30 and May 1 MICE Project Board and RLSR – November 17, 2014 Alan Bross20

The Vacuum Vessel Design MICE Project Board and RLSR – November 17, 2014 Alan Bross21

Modification to RF Coupler The RF Coupler Cooling Tube Slots Will Need To Be Covered MICE Project Board and RLSR – November 17, 2014 Alan Bross22

RF Coupler Modification II Once the tubes are in their final position the cover plate is pushed into its final position The plate is welded to the coax tube Test welding complete  vacuum leak tight MICE Project Board and RLSR – November 17, 2014 Alan Bross23

RF Coupler Modification III Low temperature solder was used, Pre-heat the Cu tubing to 200C Tin the cover plate Welding using the low temperature solder Vacuum leak tight No-discoloration of the TiN coating Coupler materials to be ordered next week MICE Project Board and RLSR – November 17, 2014 Alan Bross24

RF Coupler Modification IV The Coupler Flange will have a lip to capture the cavity flange This flange lip will fit over the cavity flange O.D. to provide a connection for rotating the coupler (modification to the vacuum vessel) The cavity flange remains un-modified MICE Project Board and RLSR – November 17, 2014 Alan Bross25

RF Coupler Modification V New Design Will Use A Standard Off-The-Shelf Clamp A prototype coupler flange has been fabricated Fits the canted spring very well Clamps have been ordered for testing 7-10 weeks lead time MICE Project Board and RLSR – November 17, 2014 Alan Bross26

Extra Ports for RF Coupler Port will look in from above and below on the coupler to cavity joint MICE Project Board and RLSR – November 17, 2014 Alan Bross27

New Actuator Design Re-use bellows we already have Simpler parts to make Easier assembly  More reliable operation Old design MICE Project Board and RLSR – November 17, 2014 Alan Bross28

Functional Test of Actuator Prototype actuator is complete Functional testing complete Successfully stretch and squeeze as designed Testing of the actuator lifetime in progress Testing plan to be defined MICE Project Board and RLSR – November 17, 2014 Alan Bross29

RF Module: Summary RF module design and fabrication progressing well Delivery date of two RF modules to RAL – Mid-May 2016 (details in MICE WBS) – Modules to be delivered to RAL fully assembled Low-level RF & vacuum tests done at LBNL Bake and backfill with N 2 – RF module assembly starts in the fall of 2015 All hardware components ready by Oct – RF module vessel fabrication readiness review April 30 and May 1, 2015 – RF coupler materials to be ordered next week Design modifications complete Fabrication of major parts will start soon One set (final production version) to be tested in MTA – Cavity (with beryllium windows) selection and EP complete – Production of actuators Prototype complete and lifetime testing to begin soon MICE Project Board and RLSR – November 17, 2014 Alan Bross30

Conclusions Spectrometer solenoids are complete and installed Step IV PRY complete – South wall installed – North and end walls in route to RAL PRY extension has no significant engineering issues – But some conceptual details need to be worked out before full design engineering can proceed RF modules will be almost identical to SCTS currently under test in MTA – Vacuum system update should lead to excellent differential pumping RF Module and PRY extension are ahead of the critical path at this point. MICE Project Board and RLSR – November 17, 2014 Alan Bross31