40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Tue Aug 25 11:02:39 2009, rana, Summary, PSL, Temperature Box D980400-B.pdf
    Reply  Tue Aug 25 18:42:42 2009, steve, Update, PSL, reference cavity temp box temporarly out of order 
       Reply  Tue Aug 25 21:36:28 2009, Alberto, Update, PSL, reference cavity temp box temporarly out of order 2009-08-25_PSLtrend.png
       Reply  Tue Aug 25 21:55:11 2009, rana, Update, PSL, reference cavity temp box temporarly out of order Untitled.pngrc-heater.jpg
          Reply  Wed Aug 26 15:42:17 2009, Alberto, Update, PSL, reference cavity temp box temporarly out of order 
             Reply  Wed Aug 26 16:11:41 2009, Alberto, Update, PSL, reference cavity temp box temporarly out of order 
                Reply  Wed Aug 26 16:31:34 2009, steve, Update, PSL, reference cavity temp box temporarly out of order 
Message ID: 1952     Entry time: Wed Aug 26 16:31:34 2009     In reply to: 1951
Author: steve 
Type: Update 
Category: PSL 
Subject: reference cavity temp box temporarly out of order 

Quote:

It turned out that half an hour was too long. In less than that the reference cavity temperature passed the critical point when the temperature controller (located just below the ref cav power supply in the same rack) disables the input power to the reference cavity power supply.

The controller's display in the front shows two numbers. The first goes with the temperature of the reference cavity; the second is a threshold set for the first number. The power supply gets enabled only when the first number comes under the threshold value.

Now the cavity is cooling down and it will take about another hour for its temperature to be low enough and for the heater power supply to be powered.

 The cavity temp cooled below SP2 set point 0.1  The Minco SP1 (present temp in Volts) now reading -0.037 so DC power supply was turned on and set to 12V 1A  

 

 

ELOG V3.1.3-