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Message ID: 4340     Entry time: Tue Feb 22 23:40:31 2011
Author: Koji 
Type: Update 
Category: IOO 
Subject: MC mode mach improvement 

As per Kiwamu's request I made a light touch to the input steering and the mode matching lens.

Here V_ref and V_trans are C1:IOO-MC_RFPD_DCMON and C1:IOO-MC_TRANS_SUM, respectively.

Result: Visibility = 1 - V_ref(resonant) / V_ref(anti_reso) = 1 - 0.74 / 5.05 = 85%

What has been done:

  • Alignment of the steering mirrors before and after the last mode matching lens
       V_ref: 2.7 ==> 2.2, V_trans: 34000 ==> 39000
  • Moving of the last mode matching lens away from the MC (+ alignment of the steering mirrors)
       V_ref: 2.2 ==> 0.74, V_trans: 39000 ==> 55000
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IOO_MMT_110222.png
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