From jonesdc at jlab.org  Thu Jul  9 15:53:07 2026
From: jonesdc at jlab.org (Donald Jones)
Date: Thu, 9 Jul 2026 19:53:07 +0000
Subject: [Halla_molpol] Moller polarimetry beam requirements for MOLLER
Message-ID: <SA1PR09MB114140568DD7157E7CAD26265D1FE2@SA1PR09MB11414.namprd09.prod.outlook.com>

Hi Folks,
I have been asked to present at next Tuesday's B-team meeting providing the beam requirements we have for polarimetry during MOLLER.
I have made up a few slides (attached). I'm not sure yet whether or not I will be available on Monday for a meeting so if anyone wants to discuss the content or missing material from my slides please let me know. If I am onsite Monday, I will send out a meeting invite Monday morning.
-Don

Donald Jones
Hall A/C Staff Scientist
Jefferson Lab
Newport News, VA
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From tuf43817 at temple.edu  Fri Jul 10 06:15:34 2026
From: tuf43817 at temple.edu (Jim Napolitano)
Date: Fri, 10 Jul 2026 10:15:34 +0000
Subject: [Halla_molpol] [External] Moller polarimetry beam requirements
 for MOLLER
In-Reply-To: <SA1PR09MB114140568DD7157E7CAD26265D1FE2@SA1PR09MB11414.namprd09.prod.outlook.com>
References: <SA1PR09MB114140568DD7157E7CAD26265D1FE2@SA1PR09MB11414.namprd09.prod.outlook.com>
Message-ID: <5E30FC98-E023-4DB1-AED6-15BDBC9EEEE9@temple.edu>

Thanks, Don. All of these points sound important to me.

I wonder if there are any issues to consider with transverse polarization. Are we safe to assume that when MOLLER is running, the beam will be maximized longitudinal polarization to Hall A regardless of whatever is running in the other halls?

Bye for now,
Jim

On Jul 9, 2026, at 3:53?PM, Donald Jones <jonesdc at jlab.org> wrote:

Hi Folks,
I have been asked to present at next Tuesday's B-team meeting providing the beam requirements we have for polarimetry during MOLLER.
I have made up a few slides (attached). I'm not sure yet whether or not I will be available on Monday for a meeting so if anyone wants to discuss the content or missing material from my slides please let me know. If I am onsite Monday, I will send out a meeting invite Monday morning.
-Don

Donald Jones
Hall A/C Staff Scientist
Jefferson Lab
Newport News, VA
<MollerBeamRequirementsforMOLLER.pptx>--
Halla_molpol mailing list
Halla_molpol at jlab.org<mailto:Halla_molpol at jlab.org>
https://mailman.jlab.org/mailman/listinfo/halla_molpol 


Jim Napolitano (he/him/his)
<tuf43817 at temple.edu>
Department of Physics
Temple University
215-204-7827
Web page<https://urldefense.proofpoint.com/v2/url?u=https-3A__faculty.cst.temple.edu_-7Etuf43817_&d=DwIGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Uhm07ntnI_AcTpLqPSRANRc0D3STzirDu-mmtSQ7G4w&m=0NJTz_YJJZKZhvHvCAs6pzXzE6bVJRRrFwcgK-y3msiDem7gupoLx_B0EPZzW7Ot&s=7sQ_rZFyRyB4pla5H-x1xTYQfY5dgnfrBgflUkCToZE&e= >

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From jonesdc at jlab.org  Fri Jul 10 07:28:32 2026
From: jonesdc at jlab.org (Donald Jones)
Date: Fri, 10 Jul 2026 11:28:32 +0000
Subject: [Halla_molpol] [External] Moller polarimetry beam requirements
 for MOLLER
In-Reply-To: <5E30FC98-E023-4DB1-AED6-15BDBC9EEEE9@temple.edu>
References: <SA1PR09MB114140568DD7157E7CAD26265D1FE2@SA1PR09MB11414.namprd09.prod.outlook.com>
 <5E30FC98-E023-4DB1-AED6-15BDBC9EEEE9@temple.edu>
Message-ID: <SA1PR09MB1141498CA1C87B30751CA777CD1FD2@SA1PR09MB11414.namprd09.prod.outlook.com>

Hi Jim,
We will be feeding back on the horizontal transverse because it drifts with energy. I assume that means tweaking the H Wien angle not the energy. The vertical polarization doesn't drift but it will need to be accurately zeroed perhaps with a spin dance initially and then more precisely by removing the left-right asymmetry on the detectors. I don't think this is related to Moller polarimetry requirements though.

That got me thinking. The plan for setting up fully transverse is to do a spin dance and measure where the minimum or zero of the asymmetry vs Wien angle using Azz. I wonder if we could also rotate the target by 7 degrees and turn the field down to 0.3T so we have almost no out of plane foil polarization and mostly in-plane target polarization. We might be able to directly measure the transverse asymmetry. It would be more out of curiosity  to see if we can see it since measuring the zero of a large signal (using Azz) would be far more accurate than the maximum of a tiny signal (with Axx). The transverse asymmetry would be ~0.75% assuming a 7% target polarization like they used to get with a slanted foil target.
-Don

Donald Jones
Hall A/C Staff Scientist
Jefferson Lab
Newport News, VA
________________________________
From: Jim Napolitano <tuf43817 at temple.edu>
Sent: Friday, July 10, 2026 6:15 AM
To: Donald Jones <jonesdc at jlab.org>
Cc: Jim Napolitano <tuf43817 at temple.edu>; halla_molpol at jlab.org <halla_molpol at jlab.org>
Subject: Re: [External] [Halla_molpol] Moller polarimetry beam requirements for MOLLER

Thanks, Don. All of these points sound important to me.

I wonder if there are any issues to consider with transverse polarization. Are we safe to assume that when MOLLER is running, the beam will be maximized longitudinal polarization to Hall A regardless of whatever is running in the other halls?

Bye for now,
Jim

On Jul 9, 2026, at 3:53?PM, Donald Jones <jonesdc at jlab.org> wrote:

Hi Folks,
I have been asked to present at next Tuesday's B-team meeting providing the beam requirements we have for polarimetry during MOLLER.
I have made up a few slides (attached). I'm not sure yet whether or not I will be available on Monday for a meeting so if anyone wants to discuss the content or missing material from my slides please let me know. If I am onsite Monday, I will send out a meeting invite Monday morning.
-Don

Donald Jones
Hall A/C Staff Scientist
Jefferson Lab
Newport News, VA
<MollerBeamRequirementsforMOLLER.pptx>--
Halla_molpol mailing list
Halla_molpol at jlab.org<mailto:Halla_molpol at jlab.org>
https://mailman.jlab.org/mailman/listinfo/halla_molpol


Jim Napolitano (he/him/his)
<tuf43817 at temple.edu>
Department of Physics
Temple University
215-204-7827
Web page<https://urldefense.proofpoint.com/v2/url?u=https-3A__faculty.cst.temple.edu_-7Etuf43817_&d=DwMGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=AXckDBOfcV0X04QaFReyEPPLFDdhHhekx_NSHHvYfcE&m=QD5CB8hcmWhrBvd-DMpOUTN5iHNb17iWPxx7WkRycINvq0oUuL6q0iKjwbzyN-QQ&s=mLWAgczZ47FXqwcJuKUSnbxIwAncWMj3dMq9liDrnQU&e=>

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From jonesdc at jlab.org  Mon Jul 13 06:58:46 2026
From: jonesdc at jlab.org (Donald Jones)
Date: Mon, 13 Jul 2026 10:58:46 +0000
Subject: [Halla_molpol] no Hall A Moller polarimetry meeting today
Message-ID: <SA1PR09MB11414567015AE5AC30D5DB851D1FA2@SA1PR09MB11414.namprd09.prod.outlook.com>

Hi Folks,
Due to a one-time conflict, I have decided to cancel the Moller polarimeter meeting today. See you next week.
-Don

Donald Jones
Hall A/C Staff Scientist
Jefferson Lab
Newport News, VA
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From jonesdc at jlab.org  Mon Jul 20 08:07:41 2026
From: jonesdc at jlab.org (Donald Jones)
Date: Mon, 20 Jul 2026 12:07:41 +0000
Subject: [Halla_molpol] Hall A Moller polarimetry meeting at 1PM today
Message-ID: <SA1PR09MB11414DD9EB024661EC600EDB7D1C32@SA1PR09MB11414.namprd09.prod.outlook.com>

Hi Folks,
We will have our weekly Hall A Moller polarimetry meeting at 1PM today. See you there.
https://jlab-org.zoomgov.com/j/1606426957
Passcode 314159
-Don

Donald Jones
Hall A/C Staff Scientist
Jefferson Lab
Newport News, VA
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From jonesdc at jlab.org  Mon Jul 27 09:31:21 2026
From: jonesdc at jlab.org (Donald Jones)
Date: Mon, 27 Jul 2026 13:31:21 +0000
Subject: [Halla_molpol] No Hall A Moller polarimetry meeting today
Message-ID: <SA1PR09MB114144B287A5449DB9600885DD1CC2@SA1PR09MB11414.namprd09.prod.outlook.com>

Hi Folks,
I know of nothing pressing or new to discuss so I am cancelling today's polarimetry meeting.
-Don

Donald Jones
Hall A/C Staff Scientist
Jefferson Lab
Newport News, VA
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