[Halld-pid] TDCs for TOF

[Paul Eugenio]

Hi,

I think the physics justification should be straight forward.  Sasha or I should be able to write up a short summary of the TDC performance and comparison studies performed at FSU.  I get back from the PWA workshop on monday and we will take this up.

Paul

--
Paul Eugenio


On Jun 21, 2012, at 5:17 PM, Eugene Chudakov <gen at jlab.org> wrote:

> Sasha is right.  The 1290A uses 4 chips (the chip has 32 channels with
> a 100ps resolution).  I confused it with the 1290N (16 channels, 2
> chips, I suppose).
> 
> The real resolution of the 1290A is about 35-39ps, accordingly to
> Sergey Boyarinov. Hall B has a lot of experience with 1290A.  They are
> using them in VME-64 crates along with the discriminators. They
> also have a board for the clock distribution (I do not know if it
> needs modifications for our environment).  The readout rate is
> somewhat (25% ?) lower than for the F1 TDC.  This means one needs 25%
> more crates.
> 
> The cost increase would be approximately $50k (please correct me if
> you know better). This is better than 100k, but still needs a physics
> justification, Please let me know if someone is willing to work on it.
> 
> Regards,
> Eugene
> 
> On Wed, 20 Jun 2012, Alexander Ostrovidov wrote:
> 
>> On Wednesday, June 20, 2012, Eugene Chudakov wrote:
>>> Hi,
>>> 
>>> The TDC selection (the CAEN ones against the F1 ones) should be
>>> addressed at some moment before ordering the F1 TDCs.
>>> 
>>> I have a simple estimate (please give me another one if you know
>>> better):
>>> 
>>> CAEN 16 ch/module => 12 modules (perhaps 13) * $9k=117k.
>>> F1 32ch/module => 7 modules * 3k = 21k.
>> 
>> CAEN VX1290A TDC also has 32 channels per module, not 16.
>> So, 176 TOF channels will require 6 modules of either CAEN or F1.
>> With one spare module, the total cost of CAEN is $63k
>> 
>> Sasha
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