KAGRA Logbook

Reports 1-1 of 1

PEM (Center)

takaaki.yokozawa - 13:55 Sunday 06 April 2025 (33273)

PEM injection 250406

I performed the PEM injection around PR3
related klog : klog33254

2025/04/06 13:00:00 - 13:31:00 Shaker injection PR3 #1
Excitation : K1:PEM-EXCITATION_MCF0_RACK_7_EXC
50 - 200 Hz , 1Hz resolution, 10 s in each measurement, 100 cnt

2025/04/06 13:00:00 - 13:31:00 Shaker injection PR3 #2
Excitation : K1:PEM-EXCITATION_MCF0_RACK_8_EXC
50 - 200 Hz , 1Hz resolution, 10 s in each measurement, 100 cnt
During this measurement, locked loss happened.

Comments to this report:

tatsuki.washimi - 12:28 Tuesday 08 April 2025 (33304)

I analyzed the data of the shaker injection at PR3 ground.

At the time of the around 192Hz injection, the strain spectrum was noisy.

The projection, by assuming these noises were caused by the injection, was much smaller than the current sensitivity.

Images attached to this comment

33304_1744082529_PR3_shaker_2025-04-06_GND_scan-005.png

33304_1744082536_PR3_shaker_2025-04-06_GND_scan-006.png

33304_1744082544_PR3_shaker_2025-04-06_GND_scan-007.png

33304_1744082550_PR3_shaker_2025-04-06_GND_scan-008.png

33304_1744082557_PR3_shaker_2025-04-06_GND_scan-009.png

33304_1744082563_PR3_shaker_2025-04-06_GND_scan-010.png

33304_1744082574_PR3_shaker_2025-04-06_GND_scan-011.png

33304_1744082583_PR3_shaker_2025-04-06_GND_scan-012.png

33304_1744082605_PR3_shaker_2025-04-06_GND_scan-013.png

tatsuki.washimi - 13:30 Tuesday 08 April 2025 (33305)

I also analyzed the data of the shaker injection at the PR3 beam-duct.

Similar to the ground shaking, the strain spectrum around 80Hz got noisy when the shaker vibrated around 190Hz (and around 173Hz).

At 89 Hz, a liner-like response was found.

Images attached to this comment

33305_1744086157_PR3_shaker_2025-04-06_Duct_scan-009.png

33305_1744086161_PR3_shaker_2025-04-06_Duct_scan-010.png

33305_1744086166_PR3_shaker_2025-04-06_Duct_scan-011.png

33305_1744086173_PR3_shaker_2025-04-06_Duct_scan-012.png

33305_1744086181_PR3_shaker_2025-04-06_Duct_scan-013.png

33305_1744086187_PR3_shaker_2025-04-06_Duct_scan-014.png

33305_1744086265_PR3_shaker_2025-04-06_Duct_scan-025.png

33305_1744086271_PR3_shaker_2025-04-06_Duct_scan-026.png

33305_1744086275_PR3_shaker_2025-04-06_Duct_scan-027.png

33305_1744086280_PR3_shaker_2025-04-06_Duct_scan-028.png

33305_1744086286_PR3_shaker_2025-04-06_Duct_scan-029.png

33305_1744086292_PR3_shaker_2025-04-06_Duct_scan-030.png

33305_1744086300_PR3_shaker_2025-04-06_Duct_scan-031.png

33305_1744086308_PR3_shaker_2025-04-06_Duct_scan-032.png

33305_1744086316_PR3_shaker_2025-04-06_Duct_scan-033.png

33305_1744086396_PR3_shaker_2025-04-06_Duct_scan-110.png

33305_1744086399_PR3_shaker_2025-04-06_Duct_scan-111.png

33305_1744086403_PR3_shaker_2025-04-06_Duct_scan-112.png

takaaki.yokozawa - 8:53 Wednesday 09 April 2025 (33316)

I tried to inject the 192 Hz to same shaker 8:47 - 8:52 today, but no significant excess can be seen in DARM signal.
So, that excess would be the chance coincidence of glich which appeared in other reason.

Images attached to this comment