Absorber R&D and Instrumentation MICE Meeting at FNAL, Jun 8-11, 2006 Shigeru Ishimoto KEK and MICE Japan “Sakuraso” Japanese Primula and Green House

L-H2 Level Sensor CX-1050-SD MICE Absorber (present version) 2-Heaters HTR L-H2 IN L-H2 OUT Room Temp. Magnet Bore L-He/N2 OUT L-He/N2 IN Thermometers CX-1050-SD (20 L)

Absorber Test Cryostat & Test Absorber

Condenser & Level Sensor KF40 L=100 Pipe For Test (0.2 L) pin feedthrough on KF40

L-H2/LHe Level sensor in absorber CX-1050-SD DC ~mA V4V4 V3V3  DC Current for L-H2/LHe should be optimized (KEK R&D). LHe LH2 

LH2/He Level Sensor KF pin feedthrough KF40 L=100 Extension Tube CX-1050-SD X5 (serial) CX-1050-SD X1 calibrated (4 wires) 2 cm

LH2 Condenser LH2 IN/OUT Heat Links Cryocooler & Condenser Condenser Heater HTR (100W) LH2/He Level Sensor In Extension KF pin feedthrough 1 st stage 2 nd stage

Absorber Test Cryostat MLIH2 TANK 2m 3 ( bar) ~1 L

LakeShore 218S Keithley 2700 DMM Cernox x8 MKS Torr Level #1-5 VAC. Gauge... MONITOR (LabView) Shoji Suzuki LakeShore 218 Keithley 2700 DMM Absorber DAQ System

0.368 l/h  (3.23 W) (MICE; 57 hr for 20 l) 0.20 l/h  (1.77 W) Cryocooler OFF Cryostat Test Results 4 hrs; 300K  20 K Empty

Level Sensor Test Results X100

L-H2 Level Sensor Test ~ 3 mW each ~ 0.75 mW ~ 0.2 mW Good linearity in L-H2 It will be tested in gas phase Thermometer 0.01mA

Changed or new parts Transition Joint  Mini flange with In-seal G-10 support of absorber & pipes 30 pin feedthrough at LH2 Inlet pipe L-He IN & OUT; straight pipes Assemble & welding method of pipes Revision of Absorber Parts Effect of cryocooler selection Smaller packing size Easy setup Wiring path near absorber Remove risk of transition joint Accuracy of pipe assemble Motivation 1 more joint between cryocooler and absorber without transition joint

G-10 Support Absorber & Pipes Mini In-Flange 30 Pin Feedthrough Tee  L-H2 IN G-H2 OUT He/N2 OUT He/N2 IN

A-A’ (22.5 deg.) G-H2 OUT  L-H2 IN He/N2 OUT He/N2 IN Straight Pipes Tee 30 Pin Feedthrough

No-Transition cut after welding Mini In-Flange G-10 Support Absorber & Pipes Heater  L-H2 IN

LH2 IN/OUT He IN/OUT Mini In-Flange; SS/Al joints In SS AL Mini Rotational Flange If it needs rotation

G-10 x8 t=1, W=25, L=90 mm Total ~ 0.2 W SS, t=1 Screws on AFC Magnet SS  15.7 AL  G-10 Support From Absorber

30 Pin Feedthrough In

Wiring of thermometers, level sensor & heaters  4 wires measurement for thermometers and heaters  LakeShare x2 218S Max. 16 Cernox 6 for absorber (2 on top )  5 8 wires for level sensors Total 32 wires inside absorber  28 2 for windows 2 for LH2 pipes 2 for C-He pipes 3 for Cryocooler  2 1 for magnet bore 3 heaters Total 52 wires in vacuum 30 Pin Feedthrough 48 Pin Feedthrough at Vacuum

PC / WS MICE absorber monitor/control (plan) IEEE-488 Keithley/ADCAC Bridge 370SDCPS READ OUTS 16 CX-1050SD’s DMR HTR 5-CX-1050 P&VAC&LEVEL Sensors Abs. HTR-UP CRYOCOOL HTR Programmable Controller or LOGIC DIO ALRAM, VALVES, CRYOCOOLER-OFF, HEATER-OFF… DCPS Abs. HTR-DWN LAN Abs. LEVEL CX-1050 cc 1mA DIRECT CONTROL CRYOSTAT Inside Abs. Contacts 2CH

(EXCEL FILE)

Thermometers in absorber AC Bridge 370S CX-1050-SD 3716; 16ch Scanner

LakeShore Cartridge Heater

Detail heater assemble for MICE absorber STOPPER HTR ¼” Hole

Digital meter relay for MICE Absorber/Cryocooler DMR; DIGITAL METER RELAY (Digital comparator) Watanabe (Japan) for example INPUT WSM-452HR-R3NNNX-22VD ; DC mV WSM-452HR-R3NNNX-32VD ; DC V WSM-452HR-R3NNNX-42VD ; DC V WSM-452HR-R3NNNX-52VD ; DC V OUTPUT( 4.5 digit set) HI-relay (NC, HO) LO-relay (NC, NO) Scaling; A-B (V)  C-D (Unit) DC24V

(1)Absorber R&D at KEK - Level sensor test is going - Absorber L-H2 cooling will start soon (2)Revision of Absorber Parts - New parts Mini In-Flanges, G-10, feedthrough, tee … - Pipe assemble, installation tools (3) Absorber Instrumentation Detail - Selection of Cernox read out, with or without heater control - Needs monitor/control program Summary