Re: A few questions (fwd)

[David Lawrence <davidl@jlab.org>]

Hi Elton,

    I have included this comment in the captions of the last two 
figures. Here is the latest version of the response to question 1.

Regards,
-David

Elton Smith wrote:
> HI Elke,
>
> One note on the rates which we should add, is that the 600 KHz in the FDC
> downstream chambers corresponds to 0.6 deg (this assumes the same dead
> region all through the drift chambers. The rate for 1 degree openning is
> closer to 150 KHz maximum or a 5% aperture.
>
> This might be a number whis is useful to quote in answering the first
> question.
>
> Cheers, Elton.
>
>
>
>
> Elton Smith
> Jefferson Lab MS 12H5
> 12000 Jefferson Ave
> Suite # 16
> Newport News, VA 23606
> elton@jlab.org
> (757) 269-7625
>
> On Wed, 7 Mar 2007, Elke-Caroline Aschenauer wrote:
>
>   
>> Dear all,
>>
>> we have to find answers to this questions I suggest we discuss them in the
>> coffee break.
>> Dan I print you document on the costing of the fdc to give it to them,
>> that should answer definetely all on it for the fdc, Curtis can we give
>> them what you gave in former times and lately to elton to be included in
>> the costbook.
>>
>> For the rest I guess it should be not very difficult to find answers.
>>
>> Regards
>> elke
>>
>>
>>
>>  ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
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>>  |       `,              Elke-Caroline Aschenauer            =
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>> |  |       ;--' | Mail:  elke@jlab.org    Mobil: 001-757-256-5224   -
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>> ---------- Forwarded message ----------
>> Date: Wed, 07 Mar 2007 08:02:21 -0600
>> From: David Christian <dcc@fnal.gov>
>> To: elke@jlab.org
>> Cc: David Christian <dcc@fnal.gov>, brooksw@jlab.org, whitlock@jlab.org
>> Subject: A few questions
>>
>> Dear Elke,
>>
>> After yesterday's session, we have a few questions the answers to which
>> would help us as we consider what to write in a report.  I would
>> appreciate it if you could respond today:
>>
>> 1) What calculation/simulation has been done of the background processes
>> that will dominate the rate in the chambers?
>>
>> 2) It appears that the minimum allowable straw radius is set by a
>> maximum allowable rate that is calculated assuming that a dE/dx
>> measurement needs to be made in these straws.  Is this correct?  If not,
>> how was the maximum allowable rate estimated?
>>
>> 3) Do you have supporting material available for the cost estimates?
>>
>> 4) Since the configuration of magnet steel is being changed, we are
>> somewhat concerned with the fact that you do not plan to map the field.
>>   What drove this decision?
>>
>> Sincerely,
>> David Christian
>>
>>
>>
>>     
>
>   

-- 

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DCReviewReply.pdf