RE: TOFr HV

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From: W.J. Llope (llope_at_physics.rice.edu)
Date: Mon Apr 07 2003 - 18:09:58 EDT

hi guys

...re: the humidity suspicions... it's a brand-new & modern
power supply. somehow i just can't believe its so sensitive
to humidity under normal operating conditions.... i agree at times
trips have occurred somehow more frequently when the humidity
is high, but i can't shake the gut feeling that this is simply an
electronic problem and the humidity evidence is concidence... (?)

when geary moves to ch-3 on the pos pod we'll have add'l info
to help isolate what's really going on...
BTW a possible sensitivity of the pigtail cabling to humidity is
even harder for me to buy... we'll see...

cheers

On Mon, 7 Apr 2003, Xu, Zhangbu wrote:

> Hi, Geary:
> If it is humidity, do we need to open the pole tip to do something
> on 16/04 (more isolation on the cables?)? I am not sure what to
> do, just curious and hope the experts know.
> Thanks!
> Zhangbu
>
> -----Original Message-----
> From: Geary Eppley
> To: Xu, Zhangbu
> Cc: 'TOFp Operations '
> Sent: 4/7/2003 5:13 PM
> Subject: RE: TOFr HV
>
> Hi Zhangbu,
>
> We know that the fist output channel of the positive CAEN supply is
> bad. The second output channel is fine. The first output channel seems
> to
> trip less with the lighter load of HVB, 9 modules, than with HVA, 19
> module, load. There are some time periods of several days when the
> first positive output doesn't trip and other periods when the first
> output trips a lot. We have no real idea why some periods are worse than
> others but I was speculating on humidity.
>
> The fix on Wednesday will involve moving to the second and third outputs
> of the CAEN. We haven't tested the third output but have no reason to
> think it will be bad.
>
> Geary
> 

-- 
_________________________________________________________
W.J. Llope, Ph.D.                  Res. Assoc. Professor
                 http://wjllope.rice.edu/default.html
                 llope_at_physics.rice.edu
T.W. Bonner Nuclear Lab.     
Rice University, MS-315      
6100 S. Main                       phone: 713-348-4741  
Houston, TX 77005-1892             fax:   713-348-5215
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