KAGRA Logbook

After the last commissioning strategy meeting, I performed the recording the time for important phenomena;
1. "K1:LSC-TR_IRX_NORM_INMON" < 0.2 (LSC_LOCK guardian decorator)
2. "K1:LSC-POP_PDA2_RF90_I_NORM_MON" < 0.1 (LSC_LOCK guardian decorator)
3. |"K1:OMC-TRANS_DC_A_IN1_DQ"| > 32000 (OMC DCPD saturation abs.)
4. "K1:IMC-CAV_TRANS_OUT_DQ" (close to the LSC_LOCK guardian decorator)
5. "K1:LSC-AS_PDA1_RF17_Q_ERR_DQ" < 0.001 (checking the AS 0 cross)

All figures can be found in here(nobandpass) and here(bandpass).

(Band pass signal is quite interesting, but I will investigate them later)

In this klog post, I investigated the locked loss of input optics (IMC or PSL?)

Fig.1. showed the typical lock loss (ID2) IMC trans power became zero, then lock loss.
The timing of the IMC trans power zero, AS 0 cross and OMC DCPD saturation are same.
(Mysterious power change in previous report?)

Totally, I found the 37 locked loss by IMC lock loss.
32 locked loss are tagged [1Hz] and "NO" [EQ] flag, that imply the high ground motion affect to IMC and locked loss IMC, then lock loss IFO
2 locked loss should be tagged [1Hz] from the BLRMS seismometer, but not tagged. (ID = 38, 185)
3 locked loss, IMC locked lossed without ground motion (ID = 118, 175, 204) we should distinguish them from previous 34 locked loss.

Instead, there were 41 locked loss which tagged only [1Hz] in previous locked loss
6 locked loss should also be tagged [EQ] from the BLRMS semsmometer, lower frequency ground motion affect to locked loss before the IMC locked loss (ID = 59, 141, 168, 171, 195, 204)
1 locked loss kept the IMC lock even tagged [1Hz], but OMC DCPD saturated. (ID = 135)
1 locked loss had long term ground motion at high frequency, mysterous ground motion and locked loss (ID = 186)
1 locked loss should remove [1Hz] tag (Not online tagging error, but human error) (ID = 158)