[Gep5] Fwd: Re: leadglass recovery

[Charles F. Perdrisat]

Carlos, you  are right, I used log instead of ln. Thanks. Charles
So it iwll not look so good

-------- Original Message --------
Subject: 	Re: [Gep5] leadglass recovery
Date: 	Thu, 08 May 2014 18:03:06 -0400
From: 	Carlos Ayerbe-Gayoso <gayoso at jlab.org>
Reply-To: 	gayoso at jlab.org
To: 	Charles F. Perdrisat <perdrisa at jlab.org>



I'll repeat all calculus, but you have a mistake in the first calculation

ln 0.2 = -1.609

I think you calculate ln 0.5 = -0.69

By the way, Bogdan caught me coming to the office and told me the need 
to measure the Quantum Efficiency (I think he means gain) of the PMTs 
after UV exposure, even the PMT are off during the UV curing. I talked 
with Mark and next week we will set a DAQ for this.

Again, what's the deal asking for absorption and saying (Bogdan) that 
using transmitivity is wrong?  Well, I'll work with mine and produce both.

See you tomorrow

Carlos

El 5/8/2014 4:38 PM, Charles F. Perdrisat escribió:
> Please check it. It shows that for the assumed asymptotic, recovery 
> and initial transparencies, <1 hour is required if the time constant 
> is <3.5 hours. Assumed is 10% lost of gain in 10 hours of beam. Charles
>
>
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