[Halld-pid] Fwd: PMT choice for TOF

[Mark M. Ito]

Folks,

Yesterday Beni sent out an email summarizing thinking on the choice of 
phototubes for the TOF (see below).

Recall that there is a problem with PMT lifetime for the high rate 
counters near the beamline, especially at 10^8 photons/s. The choice of 
PMT's is central to how we deal with this problem.

Please have a look. He is asking for feedback so that we can make a 
decision soon.

   -- Mark

-------- Original Message --------
Subject: 	[Halld-pid] PMT choice for TOF
Date: 	Mon, 12 Dec 2011 12:01:22 -0500
From: 	Beni Zihlmann <zihlmann at jlab.org>
To: 	halld-pid at jlab.org, Elton Smith <elton at jlab.org>, "Fernando J. 
Barbosa" <barbosa at jlab.org>



Dear colleagues,
In order to make a final decision on the choice and strategy with regard to
the PMTs for the TOF I put together a few facts and findings and ask for
your
opinion.
Please read the attached outline set in 4 main paragraphs:
Purpose, Facts, Calculations and Strategies

I am advocating strategy a) where we go with a two phase approach.

Let me know what you think and what makes the most sense. Depending
on your answers we will either take a decision right away or I will call
for a meeting at end of this week (beginning next) so that we can take a
decision on this matter before Christmas.


thanks everybody,
Beni





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