[Halld-tracking-hw] Preamps

[Curtis A. Meyer]

Hi Fernando

   the next tracking meeting is not until June 23, so if we wait until 
then to discuss this
issue, we will certainly fail to meet your deadline of June 25. It also 
takes several days
of cosmic running to get a data point, so checking anything also takes 
time. If there is any
way that we could have a meeting next week, it would help speed things 
along.

   thanks - Curtis


On 6/9/10 12:55 PM, Fernando J. Barbosa wrote:
> Hi Naomi,
>
> I suggest we reserve part of the next tracking meeting to discuss 
> these issues.
>
> Let me also take the opportunity to emphasize that the CDC and the FDC 
> groups must finalize their measurements so that the procurement of the 
> ASICs is not impacted. This means that I would like to close this 
> project by 25 June 2010.
>
> Thanks and best regards,
> Fernando
>
>
> Naomi Jarvis wrote:
>>
>> Good morning!
>>
>> I would like to talk about the new preamp but I don't think there 
>> will be enough time in our tracking mtg this morning.
>> The concerns are that the preamp output is topping out at around 500 
>> mV even with the cosmics, and the gain for cosmics seems to have 
>> increased, whereas for Fe55 it was ~1/3 less.
>>
>> I put one page on the wiki      
>> http://www.jlab.org/Hall-D/software/wiki/index.php/CDC#Preamp4_.28GlueXdoc1364_Tbl_2_Row_2.29 
>>
>> The recent cosmic runs there took a week each, and were with the 
>> chamber flat, ie 90 degree cosmics.   I'll add more data as it 
>> becomes available;  at present it is counting at 2kV.
>> Can we set up a time to talk about this next week?   (The rest of 
>> this week is out for us; I think the only times we cannot do next 
>> week are 1pm Tues + the regular mtg on Wed).
>>
>> Thanks,
>>
>> Naomi.


-- 
Prof. Curtis A. Meyer		Department of Physics
Phone:	(412) 268-2745		Carnegie Mellon University
Fax:	(412) 681-0648		Pittsburgh PA 15213-3890
cmeyer at ernest.phys.cmu.edu	http://www.curtismeyer.com/