Reports until 14:09, Tuesday 27 September 2022
H1 CDS (AWC, ISC, SQZ, SUS)
filiberto.clara@LIGO.ORG - posted 14:09, Tuesday 27 September 2022 (65129)
HAM7 Ground Loop Checks

D2000202 A+ SUS HAM 7 System Wiring Diagram
T1200131 Grounding and Shielding at LIGO
D1900511 ISC/SQZ Wiring Diagram

Ground loop checks for HAM7 complete. Issues found on SF1 and ZM3. Both issues addressed.

  1. ZM3 cable modified per E2100504. This addressed known in-chamber short.
  2. Camilla eliminated short by moving cables inside chamber, alog 65128.

Some of the new ISC/SQZ cables don’t follow our standard cable termination as described in T1200131. Pin 13/backshell/shield normally tied together. New cables tie the shield to the backshell, but not to pin 13. Leaving cables as is, pin 13 and backshell are tied together when connected to the chassis.

A list of cable tested and some notes:

Description Cable Location Notes
FC1 TOP SUS_FC1_001 SUS-R4 Cable modified per E2100504 (BOSEM shorts in chamber). Pin 13 and shield lifted at cable rack side.
FC1 TOP SUS_FC1_002 SUS-R4 Cable modified per E2100504 (BOSEM shorts in chamber). Pin 13 and shield lifted at cable rack side.
FC1 MIDDLE SUS_FC1_003 SUS-R4 Cable modified per E2100504 (BOSEM shorts in chamber). Pin 13 and shield lifted at cable rack side.
FC1 Bottom SUS_FC1_004 SUS-R4 Cable modified per E2100504 (BOSEM shorts in chamber). Pin 13 and shield lifted at cable rack side.
VOPO SUS_OPO_001 SUS-R4  
VOPO SUS_OPO_002 SUS-R4  
ZM1-M1 SUS_ZM1_001 SUS-R4 Cable modified per E2100504 (BOSEM shorts in chamber). Pin 13 and shield lifted at cable rack side.
ZM1-M2 Dither SUS_ZM1_006 SUS-M1 DB15 cable on rack side
ZM2-M1 SUS_ZM2_001 SUS-R4 Cable modified per E2100504 (BOSEM shorts in chamber). Pin 13 and shield lifted at cable rack side.
ZM2-M2 PSAMS AWC_ZM2_006 SQZ-R1  
ZM3-M1 SUS_ZM3_001 SUS-R4 Cable modified per E2100504 (BOSEM shorts in chamber). Pin 13 and shield lifted at cable rack side.
ZM3 M2 Dither SUS_ZM3_006 SUS-M1 DB15 cable on rack side
ZM4-M1 SUS_ZM4_001 SUS-R4 Cable modified per E2100504 (BOSEM shorts in chamber). Pin 13 and shield lifted at cable rack side.
ZM4-M2 PSAMS AWC_ZM4_006 SQZ-R1  
ZM5-M1 SUS_SQ_002 SUS-R4 Cable modified per E2100504 (BOSEM shorts in chamber). Pin 13 and shield lifted at cable rack side. Cable labeled SUS_ZM5_001 in VEA
ZM5-M2 PSAMS AWC_ZM5_006 SQZ-R1  
Oven Trans/Cav Piezo ISC_SQ_303 SQZ-R2  
SQZ Thermistor & TEC ISC_SQ_304 SQZ-R2  
SQZ DCPD & LENS Trans ISC_SQ_305 SQZ-R2  
Picomotor ISC_SQ_470 ISCT7 Pin 13/Backshell/Shield NOT tied together
Picomotor ISC-SQ_471 ISCT7 Pin 13/Backshell/Shield NOT tied together
SQZ-FC_QPD_A ISC_SQ_479 SQZ-R1 Pin 13/Backshell/Shield NOT tied together
SQZ-FC_QPD_B ISC_SQ_480 SQZ-R1 Pin 13/Backshell/Shield NOT tied together
OFI2 ISC_SQ_482 SQZ-R2 Pin 13/Backshell/Shield NOT tied together
SF1 ISC_SQ_483 SQZ-R2 Pin 13/Backshell/Shield NOT tied together
SF2 ISC_SQ_484 SQZ-R2 Pin 13/Backshell/Shield NOT tied together

F. Clara, C. Compton