KAGRA Logbook

I compared the filter conditions between recent ALS_DARM_LOCK trial and O4a, based on Ushiba-san's request. The differences are listed up below.

Date and time

yesterday 2024-07-10 2:0:0 UTC
O4a: 2023-06-10 5:14:00 UTC
At yesterday, the LSC_LOCK state was in ALS_DARM_LOCKED(300). At O4a, the LSC_LOCK state was in FIND_IR_RESONANCES(305).

Filter conditions

K1ALS-X_DRIFT_SERVO
- yesterday: FM 1, 3 were on, gain=1
- O4a: FM 1, 3 were on, gain=1 --> no difference
- Filter coefficients in FM 1, 3 have no difference.
K1ALS-Y_DRIFT_SERVO
- yesterday: FM 1, 3 were on, gain=1
- O4a: FM 1, 3 were on, gain=1 --> no difference
- Filter coefficients in FM 1, 3 have no difference.
K1LSC-ALS_DARM
- yesterday: FM 1, 7, 8, 9 were on, gain=1
- O4a: FM 2, 7, 8, 9 were on, gain=1 --> switches are different
- Filter coefficients in FM 1, 2, 7, 8, 9 have no difference.
K1LSC-DARM1
- yesterday: FM 1, 3, 8 were on, gain=1
- O4a: FM 2, 3, 8 were on, gain=1 --> switches are different
- Filter coefficients in FM 1, 2, 3, 8 have no difference.
K1LSC-DARM2
- yesterday: FM 5, 8, 9 were on, gain=-1
- O4a: FM 5, 8, 9 were on, gain=-1 --> no difference
- Filter coefficients in FM 5, 8, 9 have no difference.
VIS ETMX MN LOCK FILTERS (LENGTH)
- yesterday: FM 2, 5, 9, 10 were on, gain=1.66
- O4a: FM 2, 5, 9, 10 were on, gain=1 --> no difference on the switches. Gain is different
- Filter coefficients in FM 2, 5, 9, 10 have no difference.
VIS ETMX IM LOCK FILTERS (LENGTH)
- yesterday: FM 4, 5, 7, 9, 10 were on, gain=1.84
- O4a: FM 5, 7, 9, 10 were on, gain=1 --> the switches and filters are different. Gain is different
- Filter coefficients in FM 2, 5, 9, 10 have no difference.
- Filter coefficients in FM 5, 9 are different.
VIS ETMX TM LOCK FILTERS (LENGTH)
- yesterday: FM 3, 5, 9 were on, gain=1.62
- O4a: FM 4, 5, 9 were on, gain=1 --> the switches and filters are different. Gain is different
- Filter coefficients in FM 3 was not implemented in O4a.
- Filter coefficients in FM 4, 9 have no difference.
- Filter coefficients in FM 5 are different.
VIS ETMX TM ISCINF FILTERS (LENGTH)
- yesterday: all switches were off, gain=1
- O4a: all switches were off, gain=1 --> no difference on the switches