Reports until 23:01, Monday 12 March 2012
H2 ISC
rich.abbott@LIGO.ORG - posted 23:01, Monday 12 March 2012 (2418)
H2 TMS Cable Damage Analysis
Performed a visual and electrical analysis of a failed cable used in the Transmon ISC cabling.

Cable serial number S1104079
Part number D1000223-v1, 216 inches

The cable exhibited multiple short circuits between individual conductors and between conductors and the cable shield.  Took the cable apart and found that some of the conductors had abrasion damage that resulted in failure of the dielectric.  Other conductors showed pressure induced cold flow of the Teflon dielectric.  Also, along with substantiating evidence of this damage, it is clear that each pin is not well sized and poorly constrained within the PEEK support of the connector body.  See the pictures for a better understanding.

File 380 shows abrasion damage
File 383 shows pressure induced cold flow of Teflon
File 386 gives perspective as to where the damage physically occurred
File 385 shows how the pin diameter compares to the hole diameter (aids in understanding mating problems)
Images attached to this report