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Entry  Mon Feb 2 16:58:56 2015, manasa, Update, General, RF amplifier for ALS ALSXY_outLoop.png
    Reply  Tue Feb 3 16:43:48 2015, manasa, Update, General, RF amplifier for ALS 
       Reply  Wed Feb 4 21:05:24 2015, manasa, Update, General, RF amplifier for ALS RFampBox.png
          Reply  Fri Feb 13 19:41:13 2015, ericq, Update, General, RF amplifier for ALS 
             Reply  Sat Feb 14 00:42:02 2015, Koji, Update, General, RF amplifier for ALS 
             Reply  Thu Mar 5 11:18:28 2015, manasa, Update, General, RF amplifier box 
Message ID: 11101     Entry time: Thu Mar 5 11:18:28 2015     In reply to: 11026
Author: manasa 
Type: Update 
Category: General 
Subject: RF amplifier box 

I pulled out the RF amplifier box from the IOO rack and swapped the amplifiers for FOL beat frequency amplification. The earlier gain of 62dB (ZFL500LN + ZFL500LN) was reduced to 40dB gain (ZFL500LN+ZFL2AD).

I also swapped one of the broken sma cables that was connecting the two amplifiers with a good one. Front ports of the module were relabeled and the box was put back on the rack.

During the course of this work, I had to turn OFF the green BBPDs on the PSL table to protect them and they have been powered up after putting the module back.

Quote:

As Koji found one of the spare channels of the ALS/FOL RF amplifier box nonfunctional yesterday, I pulled it out to fix it. I found that one of the sma cables did not conduct.

It was replaced with a new cable from Koji. Also, I rearranged the ports to be consistent across the box, and re-labeled with the gains I observed. 

It has been reinstalled, and the Y frequency counter that is using one of the channels shows a steady beat freq.

I cannot test the amplitude of the green X beat at this time, as Koji is on the PSL table with the PSL shutter closed, and is using the control room spectrum analyzer. However, the dataviewer trace for the fine_phase_out_Hz looks like free swinging cavity motion, so its probably ok.

 

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