Re: Power disipation of SiPM's (fwd from Lolos)

[Elton Smith <elton@jlab.org>]

Hall D barrel calorimeter:



---------- Forwarded message ----------
Date: Wed, 28 Feb 2007 02:30:02 -0600
From: George Lolos <George.Lolos@uregina.ca>
To: elton@jlab.org
Cc: ptsmith@indiana.edu, Zisis Papandreou <Zisis.Papandreou@uregina.ca>
Subject: Re: Power disipation of SiPM's

Hi Elton:

I don't have much time to reply now because I'm packing for the long
trip back home, but here are some latest updates:

We had long and detailed discussions with SensL on the electronics and
cooling.  The latter is indeed not the most efficient cooling device
they can use because it was designed for single SiPM's and therefore
heat was not an issue.  We believe that with improvements in DR,
modification of number of arrays from 16 to 12 and cooling to just above
freezing to avoid condensation in a cooled and dehumidified environment,
the cooling power will be an integrated system approach not single
detector-based and thus reduce power requirements and heat dissipation.
There's also an open question how much and if any amplification we need
and here Paul's raw measurements will help, as will the cosmic ray tests
with SA's and the green module by early spring.

I would then suggest that the power requirements without the local
cooling are taken as the basis, in which case the overall heat is indeed
minimal.

More next Tuesday,

George

>>> Elton Smith <elton@jlab.org> 02/27/07 9:46 AM >>>

Hi George,

Just to clarify the meaning of the numbers: I assume they refer to a
single channel. Therefore

1 ch of detector is 300 uW (negligible)
1 ch of electronics (room temp) = 60mW
1 ch of electronics (cooled -20deg?) = 600mW = 0.6 W

Since we are assuming the SiPMs will be cooled, we take the last number.
For 3072 ch of Bcal readout this gives 1.8KW. This is about 3-4 times
the
power in the FDC preamps. Is this the correct way to understand these
numbers?

Thanks, Elton.

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

On Tue, 27 Feb 2007, George Lolos wrote:

> Hi Elton:
>
> Here's the feedback from SensL, with and without cooling.  I hope this
> answers your question?
>
> From Padraig:
>
> In answer to your question, the energy dissipation from the detector
is
> minimal - 300uW based on a 30V bias with upto say 10uA current draw.
> This scales with number of detectors.
>
> For the electronics
> At room temp 6-7mA of current draw at 5V gives about 60mW
> Cooled this goes up by an order of magnitude.
>
>
> Cheers,
>
> George
>