Re: [Fwd: Re: Hall D collimator cave simulation needed by RadCon](fwd)

[Alexander Somov <somov@jlab.org>]

Plots from Pavel.





---------- Forwarded message ----------
Date: Tue, 26 May 2009 13:40:25 -0400
From: Pavel Degtiarenko <pavel@jlab.org>
To: Dianne Napier <dnapier@jlab.org>
Cc: Jim Stewart <jstewart@jlab.org>, Tim Whitlatch <whitey@jlab.org>,
     Alexander Somov <somov@jlab.org>, Keith Welch <welch@jlab.org>,
     vylet@jlab.org
Subject: Re: [Fwd: Re: Hall D collimator cave simulation needed by RadCon]

Hi Dianne,
The revised calculation results for dose rates in the Hall D and inside
the cave may be found in the attached file "hd2009_v01.pdf", in the same
format as the previous set of plots made about a year ago (file
"hd2008_v01.pdf"). The new set is done using the new GEANT geometry
files that Alexander had sent me recently. The result is that the new
geometry provides more shielding for the beam line entering the Hall,
thus decreasing dose rates in the Hall to a minimum, mostly determined
by the inevitable scattering in the target, and backscattering from the
photon dump. Change of the average dose rates inside the cave is small.
Regards,
Pavel



Dianne Napier wrote:
>
> Sincerely,
>
> Dianne Napier
> dnapier@jlab.org
> 12GeV Integration Engineer
> Ph:   757-269-7475
> Cell: 757-768-8539
> Pgr:  757-584-7475
> Fax:  757-269-7691
>
> Pavel,
>
> Please let me know the status of this simulation.  do you plan to have
> it finished by the end of this month?
>
> thanks,
>
> dianne napier
> 12GeV integration engineer
>
>>
>>
>> -------- Original Message --------
>> Subject: 	Re: Hall D collimator cave simulation needed by RadCon
>> Date: 	Wed, 29 Apr 2009 10:44:01 -0400
>> From: 	Pavel Degtiarenko <pavel@jlab.org>
>> To: 	welch@jlab.org
>> CC: 	Dianne Napier <dnapier@jlab.org>, Vashek Vylet <vylet@jlab.org>
>> References: 	<49F846DE.3020106@jlab.org>
>> <55374.129.57.72.84.1241014949.squirrel@webmail.jlab.org>
>>
>>
>>
>> Hi Keith
>> I believe the redesign mostly relates to shielding arrangements
>> inside the cave and it will not change dramatically dose rates in the
>> Hall. It wasn't supposed to affect civil layouts. I will try to run
>> their new geometry and get some answers by mid-May.
>> Regards,
>> Pavel
>>
>>
>> welch@jlab.org wrote:
>>> Pavel,
>>>
>>> Didn't we (you) explain this to somebody a while back, that the final
>>> design was based on imput based on the  modeling of the precursor design?
>>>
>>> Or is this something new - have they actually done a real "redesign" that
>>> we need to have a look at?
>>>
>>> Keith
>>>
>>>
>>>> Pavel/Keith,
>>>>
>>>> I have been working intensely with Hall D as they are the first up for
>>>> installation.
>>>>
>>>> There is an open issue concerning the collimator cave redesign.
>>>>
>>>> Hall D has mentioned that you previously did a simulation on a previous
>>>> design, but a new simulation on the new layout is still needed.
>>>>
>>>> The current Shield document  doesn't match the new layout/design.
>>>>
>>>> As well, requirement changes resulting from a new simulation could
>>>> affect materials and additional shielding or relocation of equipment.
>>>> And may also affect outside shielding being done by the Civil portion of
>>>> this project.  At best, there will be minimal to no changes with the new
>>>> layout. But any changes must be know as soon as possible so scope
>>>> changes can be requested and processed in time to meet any new
>>>> requirements.
>>>>
>>>> Hall D has stated that they have previously sent you the geometry files
>>>> for the simulation of the detector that is needed for this new layout
>>>> radiation simulation.
>>>>
>>>> Please let me know the status/ where this is at on your list and if
>>>> there is any additional information needed from hall d or myself to help
>>>> push this along.
>>>>
>>>>
>>>> --
>>>> Sincerely,
>>>>
>>>> Dianne Napier
>>>> dnapier@jlab.org
>>>> 12GeV Integration Engineer
>>>> Ph:   757-269-7475
>>>> Cell: 757-768-8539
>>>> Pgr:  757-584-7475
>>>> Fax:  757-269-7691
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>
>>
>> --
>> Sincerely,
>>
>> Dianne Napier
>> dnapier@jlab.org
>> 12GeV Integration Engineer
>> Ph:   757-269-7475
>> Cell: 757-768-8539
>> Pgr:  757-584-7475
>> Fax:  757-269-7691

hd2008_v01.pdf

hd2009_v01.pdf