[Halld-pid] TDCs for TOF

[Eugene Chudakov]

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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