PSI - February 3, 2003 1 F. Sergiampietri

MEG – PMT cryogenic test: PURPOSES

- SYSTEMATIC TEST OF THE PMT’s FOR MEG IN OPERATING CONDITIONS

- BUILD AN EVOLUTIVE CRYOSTAT:

PHASE 1 MANUAL OPERATION WITH LXe EMPTING/FILLING FOR EACH PMTPHASE 2 MANUAL OPERATION WITHOUT LXe EMPTINGPHASE 3 TEST OF CARTRIDGE OF PMT’s WITHOUT LXe EMPTING

- SETUP A CRYOGENIC LABORATORY AT INFN-PISA

- GET EXPERIENCE IN HANDLING LXe

- OTHER MEASUREMENTS ON LXe

- TESTS ON OTHER PMT’s AND OTHER DEVICES (APD’s, …)

FOR THE MOMENT … PHASE 1

PSI - February 3, 2003 2 F. Sergiampietri

MEG – PMTct – Cryogenic/Vacuum Diagram

PSI - February 3, 2003 3 F. Sergiampietri

MEG – PMTct - Cryostat

PSI - February 3, 2003 4 F. Sergiampietri

MEG – PMTct - Cryostat

REFERENCE PMTHAMAMATSU R6041Q

PSI - February 3, 2003 5 F. Sergiampietri

MEG – PMTct - Cryostat

TRIGGER PMT HAMAMATSU R7400U-09

, SOURCE HOLDER

PSI - February 3, 2003 6 F. Sergiampietri

MEG – PMTct - Cryostat

FIXED SUPPORT FLANGE FOR REFERENCE PMT AND SOURCE

HOLDER

REFERENCE PMTHAMAMATSU R6041Q SOURCE AND TRIGGER PMT

HOLDER

PSI - February 3, 2003 7 F. Sergiampietri

MEG – PMTct - Cryostat

INSERT HEREGATE VALVES + LINEAR VERTICAL MOVEMENT(PHASE 2-3)

REMOVABLE SUPPORT FLANGE FOR PMT UNDER TEST

TEST PMTHAMAMATSU R6041Q

REFERENCE PMTHAMAMATSU R6041Q SOURCE AND TRIGGER PMT

HOLDER

PSI - February 3, 2003 8 F. Sergiampietri

MEG – PMTct - Cryostat

CRYOSTAT HEAD FLANGE

PSI - February 3, 2003 9 F. Sergiampietri

MEG – PMTct - Cryostat

INNER VESSEL (LIQUID Xenon)

PSI - February 3, 2003 10 F. Sergiampietri

MEG – PMTct - Cryostat

HEAT EXCHANGER COPPER BODY

PSI - February 3, 2003 11 F. Sergiampietri

MEG – PMTct - Cryostat

LN2 IN N2 OUT

LN2 HEAT EXCHANGER COIL

LXe TEMPERATURE CONTROLLED

HEATING RESISTORS

PSI - February 3, 2003 12 F. Sergiampietri

MEG – PMTct - Cryostat

VACUUM CHAMBER

PSI - February 3, 2003 13 F. Sergiampietri

MEG – PMTct - Cryostat

PSI - February 3, 2003 14 F. Sergiampietri

MEG – PMTct – Status of Phase 1 Cryostat

- FULL DESIGN AND MECHANICAL DRAWINGS COMPLETED

- CALL FOR TENDERS MADE AND JOB ASSIGNED TO THE COMPANY CINEL-Vigonza (PD), Italy

- CRYOSTAT DELIVERY EXPECTED BY THE END OF FEBRUARY

- ORDERS MADE FOR DRY UHV PUMPING GROUP, LEAK DETECTOR, UHV COMPONENTS, CRYOGENIC BOTTLE, PMT’s …

- LABORATORY PREPARATION UNDER WAY