= 40m Lab Maintenance =

We list regular/semi-regular/irregular maintenance items with cost here.

== Regular maintenance ==

Regular (annual/monthly) costs

|| Item        || Description || Frequency || Cost per period ||
|| Storage Area || || || ||
|| Zero-Grade Air Cylinders|| Airgas Part #:UZI300 || 4 Cylinders each Vent || $164.67/Cylinder ~ $658.68/Vent ||

Obsolete
|| Nitrogen Cylinders || Airgas Part #:NI 300|| 8 Cylinders per month || $159.56/Month ||


== Semi-regular maintenance ==

We know someday we will need replacement. Maintenance records should be kept in an independent page

|| Item        || Description || Frequency || Cost per replacement || ELOG Link ||
|| Oplev lasers || Lumentum 1103P || [[https://www.edmundoptics.com/p/model-1103p-2mw-linear-polarization-lumentum-hene-laser/18816/|Lumentum 1103P]] || ~ $900 - $1000 || ||
|| UPS batteries || RBC55 (For reference, PO #S625443) || [[https://www.bhphotovideo.com/c/product/1117506-REG/apc_rbc55_replacement_battery_cartridge_55.html| APC Replacement Battery Cartridge]] || ~$420 || ||
|| SR560 batteries ||  || Link here || ??? || ||

== Broken instruments 2025 List ==

|| TP2 Agilent V-70D / TwisTorr 74 || Does not run also the controller has no serial connection || || ~$9000 || ||


== Broken instruments 2024 List ==

Here are instruments in the 40m Lab the need maintenance. Some of these instruments cost more to fix than to purchase a new instrument with the Same function.


|| Item        || Description || Last maintenance date || RMA && Estimated Cost of Repair   || ELOG Link ||
|| NPRO || || || || ||
|| HVAC || || || || ||
|| SR785 #1 (SN:46756 && Property Tag: C32239)|| High Voltage leakage into CH2. elog 18006  || This was repaired on July 1, 2024 || ECA05082446756 && $2,152.50 || https://nodus.ligo.caltech.edu:8081/40m/18006 ||
|| SR785 #2 (SN:46020 && Property Tag: C21593)|| CH1 input is flakey AND Input range does not get down below -14dB|| || ECA05082446020 && $2,152.50|| ||
|| SRS DS345 (SN:40166) || “Offset o Error” displays on screen. Only Offset increases but does not generate a signal. Output is broken. || || ECA05082440166 && $1,537.50 || ||
|| DC supply || KEPCO || Cooling Fan is Shattered and Power Supply is Burnt. elog 16779 eWasted 2025/7/2|| || https://nodus.ligo.caltech.edu:8081/40m/16779||
|| HV supplies || KEPCO || || || ||
|| Yarm LSC DC supply || A 15V KEPCO Broken - replaced with Sorensen. A spare KEPCO in VOPO lab || || || ||
|| Tektronix TDS3034B || Screen glitches out during usage elog 18050 || || https://nodus.ligo.caltech.edu:8081/40m/18050 ||
|| 1201 Low Noise Pre Ampl. || || || || ||
|| Phillips PM5183 Signal Gen. (NC: 9445 051 93708 && PropertyTag: C20365 || eWasted 2025/7/2 || || || ||