[Halld-tracking-hw] Preamps

[Curtis A. Meyer]

Monday at 10:00am would be great!   Curtis
On 6/9/10 2:31 PM, Fernando J. Barbosa wrote:
> Hi Curtis,
>
> Would Monday @ 10  next week work for everyone?
>
> Best regards,
> Fernando
>
>
>
> Curtis A. Meyer wrote:
>> 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/