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Entry  Fri Jun 11 20:19:50 2021, Koji, Summary, BHD, BHD OMC invacuum wiring 40mBHD_OMC_wiring.pdf
    Reply  Thu Sep 9 09:54:41 2021, Stephen, Summary, BHD, BHD OMC invacuum wiring - cable lengths bhd_cable_length_check_cable_bracket_to_components.pngbhd_cable_length_check_flange_to_cable_bracket.pngbhd_cable_length_check_cable_bracket_to_omc_bracket.png
Message ID: 16318     Entry time: Thu Sep 9 09:54:41 2021     In reply to: 16198
Author: Stephen 
Type: Summary 
Category: BHD 
Subject: BHD OMC invacuum wiring - cable lengths 

[Koji, Stephen - updated 30 September]

Cable lengths task - in vacuum cabling for the green section (new, custom for 40m) and yellow section (per aLIGO, except likely with cheaper FEP ribbon cable material) from 40m/16198. These arethe myriad of cables extending from the in vacuum flange to the aLIGO-style on-table Cable Stand (think, for example, D1001347), then from the cable stand to the OMCs.

a) select a position for the cable stand.

 - Koji and I discussed and elected to place in the (-X, -Y) corner of the table (Northwest in the typical diagram) and near the table edge. This is adjacent to the intended exit flange for the last cable.

b) measure distances and cable routing approximations for cable bracket junctions

- Near OMC bracket to the cable stand, point to point = 17.2, routing estimate = 24.4.
- Far OMC bracket to the cable stand, point to point = 20.5, routing estimate = 32.2.

  - Recommendation = 48" for all green section cables (using one length for each OMC, with extra slack to account for routing variation).

c) (outdated - see item (b) and attachment 3) measure distances (point to point) and cable routing approximations for all items.

 +X OMC (long edge aligned with +Y beam axis) (overview image in Attachment 1)

- QPDs to the cable stand, point to point = 12, routing estimate = 20.
- DCPDs to the cable stand, point to point = 25, routing estimate = 32.
- PZTs to the cable stand, point to point = 21, routing estimate = 32.

+Y OMC (long edge aligned with +Y beam axis) (overview image in Attachment 1)

- QPDs to the cable stand, point to point = 16, routing estimate = 23.
- DCPDs to the cable stand, point to point = 26, routing estimate = 38.
- PZTs to the cable stand, point to point = 24, routing estimate = 33.

Cable stand to flange (Attachment 2) (specific image in Attachment 2)

- point to point = 35, routing estimate = 42

  - Recommendation = 120" for all yellow section cables, per Koji's preferences for zigzag cable routing on stack and coiling of slack.

Attachment 1: bhd_cable_length_check_cable_bracket_to_components.png  207 kB  Uploaded Thu Sep 9 16:50:06 2021  | Hide | Hide all
bhd_cable_length_check_cable_bracket_to_components.png
Attachment 2: bhd_cable_length_check_flange_to_cable_bracket.png  120 kB  Uploaded Thu Sep 9 16:50:15 2021  | Hide | Hide all
bhd_cable_length_check_flange_to_cable_bracket.png
Attachment 3: bhd_cable_length_check_cable_bracket_to_omc_bracket.png  242 kB  Uploaded Thu Sep 30 16:55:03 2021  | Hide | Hide all
bhd_cable_length_check_cable_bracket_to_omc_bracket.png
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