DriptaB, TonyS, RickS
The following commands were executed to update the calibrations of the Pcal Tx and Rx laser power sensors at both end stations:
caput H1:CAL-PCALX_FORCE_COEFF_RHO_T 8334.52
caput H1:CAL-PCALX_FORCE_COEFF_RHO_R 10692.3
caput H1:CAL-PCALY_FORCE_COEFF_RHO_T 7157.80
caput H1:CAL-PCALY_FORCE_COEFF_RHO_R 10652.5
These changes increase the calibrations of the Pcal sensors (ct/W) by 0.603 % in response to recent calibration of Pcal transfer standards by NIST and PTB in Germany. Details of the rationale for the update can be found in LIGO-G2300471, slides 13-18.
This change will result in a 0.063% increase in inspiral range (about 0.84 Mpc).
The changes have been accepted in SDF.
There's a typo in Rick's statement This change will result in a 0.063% increase in inspiral range (about 0.84 Mpc). It should read This change will result in a 0.603% increase in inspiral range (about 0.84 Mpc). Where I confirm this with other statements in the aLOG: (a) assuming that he quotes our range at 140 Mpc, and thus the 0.84 Mpc parenthetical above is from 140 Mpc * 0.603% = 140 Mpc * 0.00603 = 0.84 Mpc (b) the statement just prior, saying "These changes increase the calibrations of the Pcal sensors (ct/W) by 0.603 %" and that the math checks out -- that an increase in PCAL force coefficient translates to an increase in detector sensitivity -- based on historical educational material in LHO:52837.