Re: temperature test

[Elton Smith <elton@jlab.org>]

HI Beni,

You should have a source (anything will do) that runs the pmts at the
rates expected for the experiment.

Cheers, Elton.




Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave
Suite # 16
Newport News, VA 23606
elton@jlab.org
(757) 269-7625
(757) 269-6331 fax

On Thu, 31 Jan 2008, beni zihlmann wrote:

> Hi Tim,
> here some pictures of the temperature test setup. I hope that gives
> a better idea what this test is worth (or not).
> I checked on Elke's concern that the PMTs might not really draw
> that much power because if there are no signals then the PMT does
> not have to do any "work" hence less power consumption.
> I do see signals because there is enough light leakage that the PMT
> does some "work". However I found out that exactly the PMT/BASE where
> I put the temperature probe in stopped working at some point. So
> I put the temperature probe into the hole of a pmt that works for a
> fast test and also there I see no  obvious temperature change.
> Also the test with putting a  cover  (garbage bin) over the whole assembly
> is not as good a check as I thouth because that shields also the light
> and the PMTs have much less to do.
> Any suggestions what I might "improve" to get a kine of "worst case
> szenario"
> are appriciated.
>
>
> cheers,
> Beni
>