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    User name gilman and jp chen

    Log entry time 12:24:14 on October22,2002

    Entry number 88776

    Followups:

    keyword=cryotarget - turning on deu loop

    LD2 turn on: JT valve ~27 ESR 15 watt coolant flow looks stable,
    but 4 k coolant flow is not very stable.

    When I up the fan frequency, it temporarily sends the PID power output
    way down (eg, 70 W for 10 - 12%) before stabilizing slightly lower.



    
fan 10%                       PID output 273 - 294 watts
    
fan 12%                       PID output 257 - 261 (temporarily down to ~190)
    
fan 14%                       PID output 246 - 253 (temporarily down to ~130)
    
fan 16%   43 - 44 Hz  PID output  238 - 247 (oops - phone call)
    
fan 18%   48 - 53 Hz  PID output  222 - 231 (temporarily down to ~90)
    
15 K Hall A temp goes from ~13.32-13.33, stable to 13.28-13.29 during 20% 
    
setting, also precool goes down from 42 to 30.5 K, as cleanest seen effect
    
fan 20%   52 - 55 Hz  PID output  135 - 163 (temporarily down to ~53)
    
15 K temp goes to 13.31, guess it is not stable enough for a real test...
    
fan 21%   53 - 59 Hz  PID output  90 - 103  (temporarily down to ~55 ) (15k temp=13.30)
    
fan 22%  52.5 Hz (TV, not GUI)  PID output 48 - 55 (temporarily down to 25 W)
    
fan 23%  54.8 Hz  PID output to ~0 (temp went to 22.04, PID temporarily to 0 W)
    
- temp appears stable at 22.02 - 22.03, 15K temp at 13.31, opening JT
    
valve for deuterium loop 
    
-----
    
fan 23 % 54.8 Hz, JT valve 35.4, 15K temp 13.28, PID output 170-180 W
    
fan 24 % 57.2 Hz,  15 K temp 13.31, PID out 115 - 130 W (temporarily down to 90)
    
fan 25 % 59.5 Hz,  15 K temp 13.31, PID out  65 - 90 W(temporarily down to 40 W)
    

    
Conlcusion is increasing fan from 10% to 25 % dume nearly 400 W into the target.
    

    
Also note adl screen attached at end of test, 22.1 K at top.
    


    

    
FIGURE 1