Reports until 15:42, Monday 09 February 2026
H1 ISC (ISC)
marc.pirello@LIGO.ORG - posted 15:42, Monday 09 February 2026 - last comment - 16:19, Monday 09 February 2026(89090)
EX Ion Pump X-8 Scanned

Per WP13021

I have scanned the disabled SHV cable from EX Ion Pump X-8.  Using a 10' launch cable, on DTF setting, with bandpass set from 10MHz to 50MHz.

The attached plot is from the scan., the following aberations appeared on the cable run:
73m = 1st interface/reflection
130m = 2nd interface/reflection
361m = 3rd interface/reflection
456m = 4th interface/reflection

There were no other reflections beyond 456m.  All scans were done at C=1.

M. Pirello, G. Moreno

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marc.pirello@LIGO.ORG - 16:19, Monday 09 February 2026 (89091)
Link

Cable length is ~250m, assuming cable speed of about 0.5C.  Ignore every reflection after 250m.

Reflection marking end of cable is 130m from launch -10m for launch = 120m

Speed of cable = 120m/250m = 0.48C

First reflection in cable is at (73m-10m)*0.48 = 30.24m  There is likely a defect in the cable at this point due to the magnitude of the reflection here.