40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  Engineering group Lab elog  Not logged in ELOG logo
Message ID: 238     Entry time: Thu Feb 27 11:50:02 2020
Author: Marie K. 
Type: Progress 
Category: BS BRDs 
Subject: BRD9_V5 and BRD10_v5 installed today on BS 

BRD9_v5 and BRD10_v5 were remeasured and tuned yesterday (see elog 235).

I double checked the tuning right before installing the BRDs on the BS. Only BRD10 Roll mode was out of the 1% range (F = 24.05 Hz, too low), so I retuned it.

For reference, the final tuning is:

=================================

BRD9_v5 - Bounce Mode

Measurement # Frequency [Hz] Q
57 16.656 78
58 16.656 83
59 16.656 80
Mean 16.656 80

Tuning is 0.2%

BRD9_v5 - Roll Mode

Measurement # Frequency [Hz] Q
60 24.469 59
61 24.453 55
62 24.406 -
Mean 24.443 57

Tuning is 0.4%

================================

BRD10_v5 - Bounce Mode

Measurement # Frequency [Hz] Q
12 16.672 81
13 16.656 69
14 16.688 -
Mean 16.672 75

Tuning is 0.1%

BRD10_v5 - Roll Mode

Measurement # Frequency [Hz] Q
21 24.281 -
22 24.297 -
23 24.250 -
Mean 24.276 -

Tuning is 0.3%

ELOG V3.1.3-