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Entry  Thu Aug 10 13:36:08 2017, Gabriele, Zach, Mechanics, Configuration, ESD moved closer to disk in CR0 
    Reply  Fri Aug 11 09:22:21 2017, Gabriele, Mechanics, Configuration, ESD moved closer to disk in CR0 esd_ampl.pngesd_snr.png
Message ID: 405     Entry time: Thu Aug 10 13:36:08 2017     Reply to this: 406
Author: Gabriele, Zach 
Type: Mechanics 
Category: Configuration 
Subject: ESD moved closer to disk in CR0 

We first measured the distance of the ESD from the disk in the test chamber (CR0). We had to remove the retaining ring to have reliable measurements

  • distance between top of the ESD and mounting plate: 12.30 mm
  • distance between top of the disk and mounting plate: 10.53 mm
  • ESD thickness: 0.55 mm

So initially the distance between disk and ESD is 1.22 mm

We re-aligned the optical setup to a horizontal reference, and moved down the ESD as much as we could. It's not completely clear if the ESD is touching the disk. We'll see after pump down. The new distance from the top of the ESD to the mounting plate is about 11.80 mm, so we should have moved the ESD 0.5mm closer to the disk.

Pump down started at ~1:30pm

Excitations

  • Old configuration, 1.2mm distance ESD-disk:
    • GPS before exc. 1186417492 
    • GPS after exc. 1186417546
  • New configuration, 0.7mm distance ESD-disk
    • GPS before exc. 
    • GPS after exc.
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