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Reports until 09:25, Tuesday 27 June 2023
H1 AOS (ISC)
craig.cahillane@LIGO.ORG - posted 09:25, Tuesday 27 June 2023 (70865)
Mod depth test with hot OM2 and 60W input
Here are the results of the June 27 2023 mod depth up down test 60 W:


Power-recycling gains for sidebands and carrier

9 MHz PRG = 68.7
45 MHz PRG = 30.2
Carrier PRG = 50.6

Reflection ratios for sidebands and carrier

9 MHz reflection ratio = 0.219
45 MHz reflection ratio = 0.214
Carrier reflection ratio = 0.064


It appears the carrier PRG and PRG9 is recovered significantly compared to 75 W alog 69023, or 78 W alog 68696.
The PRG45 is also higher, but it's hard to trust that POP A LF 45 is telling us anything super robust with < 1% of the power there coming from 45.

The carrier PRG is higher at 60 W than at 25 W in alog 68696 after MOVE_SPOTS, which is unusual but the total PRG is also higher now (Total PRG = 50.6).  

Table of relative powers:
Channels9 MHz45 MHzCarrier
H1:IMC-PWR_IN_OUT160.0130.0150.971
H1:IMC-IM4_TRANS_NSUM_OUT160.0130.0150.972
H1:LSC-REFL_A_LF_OUT160.0420.0460.912
H1:LSC-REFL_B_LF_OUT160.0400.0430.917
H1:LSC-POP_A_LF_OUT160.0180.0090.973
H1:ASC-POP_A_NSUM_OUT160.0170.0090.974
H1:ASC-POP_B_NSUM_OUT160.0170.0090.974
H1:ASC-AS_C_NSUM_OUT160.1640.4990.337
H1:ASC-OMC_A_NSUM_OUT160.1670.5470.286
H1:ASC-OMC_B_NSUM_OUT160.1770.6200.203
H1:ASC-X_TR_A_NSUM_OUT160.0050.0070.988
H1:ASC-X_TR_B_NSUM_OUT160.0050.0070.988
H1:ASC-Y_TR_A_NSUM_OUT160.0050.0070.988
H1:ASC-Y_TR_B_NSUM_OUT160.0050.0070.988
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