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

2. 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

3. 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)

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

5. R7600U PMT’s and base board

6. Slice test box with new shields and base board

7. 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

8. 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

9. 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

10. HF+ IPHI 3 light guide mirrors replaced
AFTER
BEFORE

11. 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.