[Clas12_verystrange] Affected runs - momentum offset

[nicholas]

> Begin forwarded message:
> 
> From: Raffaella De Vita <Raffaella.Devita at ge.infn.it>
> Subject: Re: [Clas12_calcom] CALCOM Meeting Friday Mar. 6
> Date: 8 March 2020 at 16:05:14 GMT
> To: "clas12_calcom at jlab.org" <clas12_calcom at jlab.org>
> Cc: Daniel Carman <carman at jlab.org>, Nick Zachariou <nick.zachariou at york.ac.uk>, Geraint Clash <gc1108 at york.ac.uk>
> 
> Dear All,
> Following thee discussion we had on Friday about a possible shift of reconstructed momenta in the RG-A Fall18 outbending data, I checked the torus settings from the Mya archive. As you can see from the plot below, it seems that between 11/6/2018 and 11/12/2018, even if the torus current setpoint was -3770 A as usual, the MPS readback was -3800 and the hall probe read back was about-3796 A instead of the usual 3766. This is about 1% difference that would explain the missing mass shift observed by Geraint in the 2pi channel and the sampling fraction shift observed by Cole.
> From Mya, it seems everything went back to normal on 11/12 at 1pm. The runs affected by this potential shift are 5422 to 5476. 
> Best regards,
> 	Raffaella
> 
> 
> 
> 
>> On 4 Mar 2020, at 10:51, Daniel Carman <carman at jlab.org <mailto:carman at jlab.org>> wrote:
>> 
>> Dear All,
>> 
>> There will be a CALCOM meeting this Friday, Mar. 6 at 10 a.m. EST. The preliminary agenda is available at 
>> https://clasweb.jlab.org/wiki/index.php/2020_Meetings <https://clasweb.jlab.org/wiki/index.php/2020_Meetings>. Let me know if you have other topics to discuss or 
>> updates that you would like to give. If you have slides to show please link them to the wiki.
>> 
>> The meeting will be in B207 for people on site. Remote participants can connect via bluejeans following the 
>> instructions given below.
>> 
>> Regards,
>> Daniel
>> 
>> BlueJeans meeting information:
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>> Meeting Id:    502085879 <>
>> 
>> Dial into the meeting :
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>> ***************************************************************************
>> *                                                                                                 
>> * Dr. Daniel S. Carman                  e-mail : carman at jlab.org <mailto:carman at jlab.org> 
>> * Staff Scientist                          office : (757)-269-5586
>> * Jefferson Laboratory                web: http://userweb.jlab.org/~carman <http://userweb.jlab.org/~carman>  
>> *                                                                                                                  
>> ***************************************************************************
>> 
>> 
>> 
>> 
>> 
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