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
Entry  Mon Jan 13 14:36:32 2020, Maria G, Progress, BS BRDs, BRD 7 and 8 Drift Witnesses BRD_7_v5.xlsx
    Reply  Tue Jan 14 14:47:33 2020, Maria G, Progress, BS BRDs, BRD 7 and 8 Drift Witnesses 
Message ID: 229     Entry time: Tue Jan 14 14:47:33 2020     In reply to: 228
Author: Maria G 
Type: Progress 
Category: BS BRDs 
Subject: BRD 7 and 8 Drift Witnesses 

Today we added the masses for the Roll of BRD 8:

4.043+2.351+screw= 7.293g


We built 2 BRDs with version 5 of the blade before the break to be used as witnesses for the drift over the next weeks. BRD 8 is made with a baked blade from last summer. We didn't have time to properly tune the BRDs, but they can still be used as witnesses.

BRD 7 BRD 8 (baked)
Bounce: 4.228+4.229+screw= 9.269g Bounce: 4.221+2.42+2.35+screw= 9.843g
Roll: 4.173+2.366+screw= 7.360g Missing screw to complete

Here are the measurment results for BRD 7 before and after the break. We see a negative drift for both modes. For the roll mode the drift is -0.1% and the bounce mode is -0.3%.



ELOG V3.1.3-