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Entry  Sun May 2 17:16:43 2010, Koji, Update, SUS, How to steer the incident beam to the MC? steering.png
    Reply  Mon May 3 00:36:49 2010, Koji, Update, SUS, How to steer the incident beam to the MC? 
       Reply  Mon May 3 01:35:41 2010, Koji, Update, SUS, Lessons learned from MC spot centering 
Message ID: 2868     Entry time: Mon May 3 00:36:49 2010     In reply to: 2867     Reply to this: 2870
Author: Koji 
Type: Update 
Category: SUS 
Subject: How to steer the incident beam to the MC? 

Actually, I tried some tweaks of the input steering to get the beam being more centered on the MC mirrors on Saturday evening.

I made a mistake in the direction of the IM1Y tuning, and it made the horizontal spot position worse.

But, this also means that the opposite direction will certainly improve the horizontal beam angle.

Rotate IM1Y CCW!!!


The current setting is listed below

Alignment
MC1P 3.2531
MC1Y -0.5327
MC2P 3.3778
MC2Y -1.366
MC3P -0.5534
MC3Y -2.607


Spot positions
MC1H = +1.15 mm
MC1V = -0.13 mm
MC3H = +0.80 mm
MC3V = -0.20 mm

 

Quote:

Deviations of the MC spot from the center of the mirrors were measured.

MC1H = +0.29 mm
MC1V = -0.43 mm
MC3H = +1.16 mm
MC3V = -0.68 mm

 

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