MEG PMT cryogenic test PURPOSES SYSTEMATIC TEST OF

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 PMT PHASE 2 MANUAL OPERATION WITHOUT LXe EMPTING PHASE 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 1 1

MEG – PMTct – Cryogenic/Vacuum Diagram PSI - February 3, 2003 2 2

MEG – PMTct - Cryostat PSI - February 3, 2003 3 3

MEG – PMTct - Cryostat REFERENCE PMT HAMAMATSU R 6041 Q PSI - February 3, 2003 4 4

MEG – PMTct - Cryostat TRIGGER PMT HAMAMATSU R 7400 U -09 a, b PSI - February 3, 2003 5 SOURCE HOLDER 5

MEG – PMTct - Cryostat FIXED SUPPORT FLANGE FOR REFERENCE PMT AND SOURCE HOLDER REFERENCE PMT HAMAMATSU R 6041 Q SOURCE AND TRIGGER PMT HOLDER PSI - February 3, 2003 6 6

MEG – PMTct - Cryostat REMOVABLE SUPPORT FLANGE FOR PMT UNDER TEST INSERT HERE GATE VALVES + LINEAR VERTICAL MOVEMENT (PHASE 2 -3) TEST PMT HAMAMATSU R 6041 Q REFERENCE PMT HAMAMATSU R 6041 Q SOURCE AND TRIGGER PMT HOLDER PSI - February 3, 2003 7 7

MEG – PMTct - Cryostat CRYOSTAT HEAD FLANGE PSI - February 3, 2003 8 8

MEG – PMTct - Cryostat INNER VESSEL (LIQUID Xenon) PSI - February 3, 2003 9 9

MEG – PMTct - Cryostat HEAT EXCHANGER COPPER BODY PSI - February 3, 2003 10 10

MEG – PMTct - Cryostat N 2 OUT LN 2 IN LXe TEMPERATURE CONTROLLED HEATING RESISTORS LN 2 HEAT EXCHANGER COIL PSI - February 3, 2003 11 11

MEG – PMTct - Cryostat VACUUM CHAMBER PSI - February 3, 2003 12 12

MEG – PMTct - Cryostat PSI - February 3, 2003 13 13

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 PSI - February 3, 2003 14 14