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

Replaces eight lowest eta PMT’s with Hamamatsu R7600U-200-M4 PMT’s Slice test readout box Replaces eight lowest eta PMT’s with Hamamatsu R7600U-200-M4 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

Slice box assembly cross-section for R7600U PMT’s Shield Ground strap Base board Plate II PMT Kapton insulator “Iron” shield ~17mm PMT to light guide Optical coupling (“sleeve”) Plate I Light guide mirror Light guide assembly (part of wedge)

Readout box with shields Shields plug into existing readout box “Plate1”

R7600U PMT’s and base board

Slice test box with new shields and base board

Box tested in BAT904 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 HF ROB test unit Simulates calibration light distribution of HF wedge * Big thanks to Halil Saka for his work in 904

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

Locations of interventions Spare HV cable routing (from cable storage near rack X3U72 to IPHI 67) Light guide Mirror replacement IPHI=3 Removal of position measurement arm Readout box replacement IPHI=67

HF+ IPHI 3 light guide mirrors replaced AFTER BEFORE

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