[Halld-cps] [EXTERNAL] Re: Hall D CPS meeting on Monday

[Hovanes Egiyan]

Hi Vitaly,

If we take the data in the EPICS archiver for GlueX and scale the beam current to 5uA, then we get that the radiation dose rate near the electronic racks in the tagger hall will be about 10 rem/hour as detected by the gamma radiation probe (the neutron probe indicates a factor of 50x smaller dose rate).  The gamma probe, I believe,  is somewhere on the floor. Pavel’s simulation estimates from his preprint are 5-20 rem/hour for total rates, depending on the z-coordinate, for a similar radiator thickness. This means that 200 rem/hour is approximately 10 to 40 times more (depending what number we exactly compare to) than what we would get with 5uA beam and the nominal GlueX radiator without extra shielding.

I believe that we should aim to be below 20 rem/hour in the tagger hall with the CPS setup to be able to be consistent with what we argued in the proposal.

Hovanes.


From: Vitaly Baturin<mailto:vitbaturin01 at gmail.com>
Sent: Tuesday, December 6, 2022 5:52 PM
To: Hovanes Egiyan<mailto:hovanes at jlab.org>
Cc: halld-cps at jlab.org<mailto:halld-cps at jlab.org>
Subject: [EXTERNAL] Re: [Halld-cps] Hall D CPS meeting on Monday

Dear Colleagues
My note concerns the maximum dose rate  around the CPS.
>From  Fig.16 of our technical note

https://www.overleaf.com/project/62acf5358f0842034a10659b<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.overleaf.com_project_62acf5358f0842034a10659b&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=LSns0Jn-3qapUiEIcy9zXPfty-CatLIPNx9zyzVp3-s&m=a-8S-9wmnLdz42aA7mS5Ege0zd8-pIs740NzGFiNWMEe483DAy0uontT9vp3_Foz&s=Zl5xZxgCuH7-7r41GdU1kOjhMdTe88kqFWuq9eYPOPI&e=>

we find that the maximum "PROMPT DOSE EQUIVALENT" is ~200 rem/hr. This quantity includes biological effects.
>From Fig.17 of the same document we read "PROMPT DOSE" of 10 rad/hr. which does not include biological effects.
----------------------
Dr. Vitaly Baturin,
OCNPS 2103A, Old Dominion University,
4600 Elkhorn Ave,  Norfolk,
VA 23529 USA.
757 633 5669

----------------------
Off:     (757) 683 5807
Mob:   (757) 633 5669
Skype: vitaly.baturin


On Fri, Dec 2, 2022 at 8:33 PM Hovanes Egiyan <hovanes at jlab.org<mailto:hovanes at jlab.org>> wrote:
Hi all,
Since we could not go over all the topics during our last meeting, let’s have an extra CPS meeting coming Monday, December 5th, at 1:30pm JLAB time using Zoom to discuss CPS design for Hall D.  The preliminary agenda is posted at :
https://wiki.jlab.org/klproject/index.php/CPS_meeting_-_December_5,_2022

Feel free to add more discussion items.
Zoom Meeting ID: 160 854 7409
Passcode: 454278
URL:  https://jlab-org.zoomgov.com/j/1608547409?pwd=bWhpZG1yWVk1TWlEb3BjUW9DdmVLZz09<https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1608547409-3Fpwd-3DbWhpZG1yWVk1TWlEb3BjUW9DdmVLZz09&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=LSns0Jn-3qapUiEIcy9zXPfty-CatLIPNx9zyzVp3-s&m=a-8S-9wmnLdz42aA7mS5Ege0zd8-pIs740NzGFiNWMEe483DAy0uontT9vp3_Foz&s=7CnzFikALdhim33vukpYyWR1tCX3XuW9zgzBb0tQCC8&e=>

Best,
   Hovanes.


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