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Re: [Fwd: Re: Hall D collimator cave simulation needed by RadCon]
Thanks a lot Pavel !
It seems that fluxes of all particle types are very small
(I will compare them with the fluxes I've obtained using
our Geant; as expected, they look very similar).
I will post your slides to the GlueX wiki page.
Cheers,
Sascha
On Thu, 28 May 2009, Pavel Degtiarenko wrote:
> Hi Alex,
> Attached please find the plots for radial flux distribution at the plane
> z=-90 cm, both incoming and outgoing. Unless something is totally wrong, it
> seems that the new design of the beam line have killed essentially all
> background coming from the cave, compared with the backscattering. Neutron
> statistics is poor, I would need a new MC run with cross sections amplified
> to see neutrons better. -- After I'm back at JLab in mid-June.
> Regards,
> Pavel
>
>
>
> Alexander Somov wrote:
>>
>> 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
>>>
>>>
>
>