[Rich] DREAM tests

[Serguei Kuleshov]

               Dear All,
I am very surprised with the terminology and an exotic method for the timing measurement in this report.
I think that statements "we estimate an intrinsic DREAM time resolution of the order of 1.2ns" and then "This is not sufficient for the RICH application, that requires resolutions below 1ns" are a little bit strange.
There is very simple and standard method to measure "intrinsic time resolution" with the charge injection. And I would recommend to use this method.
Ideally the time resolution or the jitter of a chip depends from the noise of the chip, and the noise depends from input capacitance on the chip. I think that somebody has done such measurements for DREAM chip.
And the question is about a combination of MAPMT and the chip. If a realistic composition of the PMT anode with a connection to the chip provides too large input capacitance for DREAM chip it could be a reason for rejection of this chip from the consideration. 
 

Sergey Kuleshov
 
________________________________________
From: rich-bounces at jlab.org [rich-bounces at jlab.org] on behalf of Marco Mirazita [Marco.Mirazita at lnf.infn.it]
Sent: 21 January 2014 12:24
To: rich at jlab.org
Subject: [Rich] DREAM tests

Hi all,
based on the results I showed at the RICH meeting of a couple of weeks
ago, I wrote a report on our tests of the DREAM, you can find it in the
RICH wiki page:
https://clasweb.jlab.org/wiki/index.php/RICH_Technical_Notes
Comments are welcome.
Marco

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