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Re: [Fwd: Re: Hall D collimator cave simulation needed by RadCon]
Hi Pavel,
Thanks a lot for very interesting plots. It seems that our
current design of the cave reduces the dose rate in the experimental
hall.
Would it be a lot of efforts for you to plot doses in front of
the GlueX detector (let's say at z=-1m) as a function of the radial
distance from the beamline ?
Thanks,
Alex
On Tue, 26 May 2009, Pavel Degtiarenko wrote:
> 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
>
>