HF Slice test box installation HF ECR follow

HF “Slice test box” installation HF ECR follow up, Dec 3, 2010 Ianos Schmidt 1

Slice test readout box Replaces eight lowest eta PMT’s with Hamamatsu R 7600 U-200 -M 4 PMT’s Existing “plate 2” Existing PMT shields For 16 standard HF PMT’s Base board for new PMT’s: • • Conventional resistive bases provides“Reference” signals for QIE Ground connections to shields Safety ground “Mini Plate 2” New PMT shields 2

Slice box assembly cross-section for R 7600 U PMT’s Shield Ground strap Base board Plate II Kapton insulator PMT “Iron” shield ~17 mm PMT to light guide Optical coupling (“sleeve”) Plate I Light guide mirror Light guide assembly (part of wedge) 3

Readout box with shields • Shields plug into existing readout box “Plate 1” 4

R 7600 U PMT’s and base board 5

Slice test box with new shields and base board 6

Box tested in BAT 904 Test setup: • Slice box • HF front end crate + Calibration Unit • HF LASER/LED light distribution fibers and CLI • HF front end cables • HF HV supply + CAEN supply • HV adapter cable, later installed in USC TESTS: • Laser/LED • Channel mapping verification • HV mapping • Gain/single PE • CAEN HV supply test • HV cable adapter test • Pedestal and light tightness * Big thanks to Halil Saka for his work in 904 HF ROB test unit Simulates calibration light distribution of HF wedge 7

Location of new PMT’s IPHI 67 Covered PMT (IETA 29, short) New PMT’s are located on HF+ at IPHI 67 and cover towers IETA 29 to IETA 32 8

Locations of interventions Spare HV cable routing (from cable storage near rack X 3 U 72 to IPHI 67) Light guide Mirror replacement IPHI=3 Removal of position measurement arm Readout box replacement IPHI=67 9

HF+ IPHI 3 light guide mirrors replaced BEFORE AFTER 10

Sleeves in IPHI 3, IETA 29 “Telescopic” Sleeve made of 3 M radiant mirror film (“HEM”). Non conductive. TEFLON IETA 29 S Mirror Light guide tube IETA 29 L TYVEK In HF+ IPHI 3 all mirrors were replaced with standard “German Mylar”. HEM sleeves were installed everywhere except IETA 29 S and IETA 29 L which have Teflon and Tyvec sleeves respectively. 11