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Hi everyone,</div>
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I just updated the Figure-of-Merit section of the jeopardy document, comparing NH3 with the PAC39-approved version of HD. According to their report, the requirement was a "...spin relaxation time of 50 days with a beam current of 1 nA." So I used those numbers
to generate the table. Please take a look and let me know if it does not make sense.</div>
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Thanks,</div>
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Chris</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Clas12_rgh <clas12_rgh-bounces@jlab.org> on behalf of Volker Burkert via Clas12_rgh <clas12_rgh@jlab.org><br>
<b>Sent:</b> Sunday, April 7, 2024 10:41 AM<br>
<b>To:</b> silvia@jlab.org <silvia@jlab.org>; Anselm Vossen, Ph.D. <anselm.vossen@duke.edu><br>
<b>Cc:</b> clas12_rgh@jlab.org <clas12_rgh@jlab.org><br>
<b>Subject:</b> Re: [Clas12_rgh] [EXTERNAL] RGH Jeopardy document</font>
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Hi Anselm,</div>
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<br>
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My understanding is that the number Sylvia came up with is a process-independent evaluation. However, if you want to measure
<b>polarized target</b> asymmetries you will have to take into account that of the 17 nucleons in NH3 only the 3 protons in the hydrogen are polarized. Then it depends how well you can separate the process you are interested from the background contributions,
what the <b>effective luminosity</b> is. For <b>SIDIS,</b> if you are able to identify that the reaction occured on a proton, the reduction is 3/10. If you cannot separate reactions on
<b>free</b> (polarized) protons from<b> bound</b> (unpolarized) protons (which may be possible at some level for an exclusive process like DVCS, but may be difficult in SIDIS), you would have to make a subtraction of measurements on an unpolarized target,
e.g. carbon-12, from the NH3 data, which will also significantly affect the sensitivity. </div>
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Of course, RG-C had to deal with the same subtraction procedure it would be best to get input from the RG-C folks (Sebastian, Harut,Sylvia,...). </div>
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In any case, the <b>detector luminosity</b> is the number ~5x10^33 (unless we find some improved shielding for the background; this should be explored further), but the
<b>effective</b> luminosity, which determines the sensitivity of your reaction, is significantly reduced from the unpolarized part of the target, and is process dependent. </div>
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Cheers,</div>
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Volker</div>
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<b>From:</b> silvia@jlab.org <silvia@jlab.org><br>
<b>Sent:</b> Sunday, April 7, 2024 5:34 AM<br>
<b>To:</b> Anselm Vossen, Ph.D. <anselm.vossen@duke.edu><br>
<b>Cc:</b> Volker Burkert <burkert@jlab.org>; clas12_rgh@jlab.org <clas12_rgh@jlab.org><br>
<b>Subject:</b> Re: [Clas12_rgh] [EXTERNAL] RGH Jeopardy document</div>
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<div style="font-size:11pt">Hi Anselm,<br>
in our DVCS count-rate estimate we are taking RGA Fall18 data for pDVCS<br>
and rescaling them by a RGH/RGA acceptance ratio (from gemc simulations of<br>
the two run periods), times a ratio of the luminosities and beam times of<br>
the two RGs. For RGH we have used 5*10^33 lumi and 100 days of beam time.<br>
For RGA we have been having a hard time getting feedback from various RGA<br>
members on how many PAC days Fall18 corresponds to. We were finally given<br>
the integrated charge. Assuming a luminosity of 0.8*10^35 for RGA, we<br>
deduced roughly 10 days of beam time for the inbending dataset.<br>
So the lumi factor RGH/RGA comes out to be 100/10*(5*10^33/0.8*10^35)=0.6.<br>
Then you need to fold in the acceptance ratio, which depends on your<br>
reaction.<br>
Best regards,<br>
Silvia<br>
<br>
<br>
> Dear All,<br>
><br>
> Matthew worked on SIDIS simulations that he will show Monday.<br>
> He will look at single and di-hadron asymmetries.<br>
> I talked to Andreas Metz from Temple who I work with on EIC impact studies<br>
> and he told me that they can try to come up with impact studies using RGH<br>
> pseudodata in the next two weeks (but no promises).<br>
><br>
> I also promised Marco to work on the SIDIS part in the next few days.<br>
><br>
> One question though about the anticipated statistics: I see the dilution<br>
> and polarization factors for the target in the document but it is not<br>
> clear to me how the anticipated integrated luminosity compares to a given<br>
> RGA period.<br>
><br>
> From the conservative luminosity estimate, I would get a factor 20 less<br>
> but how much running time is requested? Is 1/20th of the RGA statistics<br>
> reasonable?<br>
><br>
> What are the DVCS projections using?<br>
><br>
> Thanks,<br>
><br>
> Anselm<br>
><br>
><br>
><br>
> ________________________________________<br>
> From: Clas12_rgh <clas12_rgh-bounces@jlab.org> on behalf of Silvia<br>
> Niccolai via Clas12_rgh <clas12_rgh@jlab.org><br>
> Sent: Saturday, April 6, 2024 12:40 PM<br>
> To: Volker Burkert<br>
> Cc: clas12_rgh@jlab.org<br>
> Subject: Re: [Clas12_rgh] [EXTERNAL] RGH Jeopardy document<br>
><br>
> Hello all,<br>
> Sebastian, Adam and I are working on DVCS projections, I’ll include them<br>
> tomorrow and update the text accordingly.<br>
> Best regards,<br>
> Silvia<br>
> Sent from my iPhone<br>
><br>
> On 6 Apr 2024, at 18:25, Volker Burkert via Clas12_rgh<br>
> <clas12_rgh@jlab.org> wrote:<br>
><br>
> <br>
> Thank you Chris!<br>
> Much improved on the polarized target.<br>
> Volker<br>
><br>
> ________________________________<br>
> From: Christopher Keith <ckeith@jlab.org><br>
> Sent: Saturday, April 6, 2024 9:10 AM<br>
> To: clas12_rgh@jlab.org <clas12_rgh@jlab.org>; mcontalb@fe.infn.it<br>
> <mcontalb@fe.infn.it>; Volker Burkert <burkert@jlab.org><br>
> Subject: Re: [Clas12_rgh] [EXTERNAL] RGH Jeopardy document<br>
><br>
> Hi Volker,<br>
> Take a look at the jeopardy document again. I did some editing yesterday<br>
> afternoon. There is a new, longer Target section, and references to the<br>
> bulk superconducting magnet and Hall C magnet have been commented out.<br>
><br>
> Chris<br>
> ________________________________<br>
> From: Clas12_rgh <clas12_rgh-bounces@jlab.org> on behalf of Volker Burkert<br>
> via Clas12_rgh <clas12_rgh@jlab.org><br>
> Sent: Friday, April 5, 2024 10:27 PM<br>
> To: clas12_rgh@jlab.org <clas12_rgh@jlab.org>; mcontalb@fe.infn.it<br>
> <mcontalb@fe.infn.it><br>
> Subject: Re: [Clas12_rgh] [EXTERNAL] RGH Jeopardy document<br>
><br>
> Dear Marco,<br>
><br>
> I have read the draft and have a few comments that I list here.<br>
><br>
><br>
> 1.<br>
> In section 2 Physics highlights under GPD E it says that "Its measurement<br>
> in ... DVCS requires a transversely polarized proton target as a<br>
> complementary approach to the beam spin asymmetry of an unpolarized<br>
> neutron target" I think this formulation is misleading as it could be<br>
> interpreted that a measurement on a transverse polarized proton target is<br>
> equivalent to a measurement of the beam spin asymmetry on an unpolarized<br>
> neutron target. This would be incorrect as the measurement on a neutron<br>
> target measures E^n, while the transverse proton target measures E^p.<br>
> These are obviously different quantities.<br>
><br>
> 2.<br>
> Section 3.3 - Bulk Magnet. I am not sure if we should include a fairly<br>
> long section into the discussion, as this was only relevant for the HDIce<br>
> option.<br>
><br>
> 3.<br>
> I have some concern on including anything on the Hall C polarized target<br>
> in the presentation. It could cause a discussion that we not necessarily<br>
> want as it just distracts from focusing on our solution to the HDIce<br>
> problem. If for some reason anyone would bring it up we should be prepared<br>
> to address it.<br>
><br>
> 4.<br>
> Minor typos: Section 4.1. The luminosity 10x10^35 = 10^36 should be just<br>
> 10^35. The "1 mrad in azimuthal angle" should be " 1 mrad in polar<br>
> angle".<br>
><br>
> 5.<br>
> Section 5 Physics Observables. I suggest to replace 12 GeV with 10.6 GeV<br>
> or 11 GeV.<br>
><br>
><br>
> Best regards,<br>
> Volker<br>
><br>
><br>
> ________________________________<br>
> From: Clas12_rgh <clas12_rgh-bounces@jlab.org> on behalf of Marco<br>
> Contalbrigo via Clas12_rgh <clas12_rgh@jlab.org><br>
> Sent: Monday, April 1, 2024 7:15 AM<br>
> To: clas12_rgh@jlab.org <clas12_rgh@jlab.org><br>
> Subject: [Clas12_rgh] [EXTERNAL] RGH Jeopardy document<br>
><br>
> Dear all,<br>
> a draft of the RGH jeopardy document has been opened<br>
> on overleaf. You can access it via<br>
><br>
> <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.overleaf.com_read_hsmmsyrcbrbm-23a78ab6&d=DwIBAg&c=CJqEzB1piLOyyvZjb8YUQw&r=QWa4FYrGl2z7tyOHBIYcegdYaNKy_NApZOlUL0J3DAI&m=U0h7CvSrGo84Dcp2l9ksvTIjRAz93gEI1DoJYrNskJW6O3n-D4BvXACmk7_lCVox&s=oHCIemsXaYK6DXaH6ufh-8_RnQqK55wLu2t54a3xanU&e=" id="OWAfdaec954-2e9d-803b-58a5-c06a1c5da97c" class="x_OWAAutoLink" data-auth="NotApplicable">
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.overleaf.com_read_hsmmsyrcbrbm-23a78ab6&d=DwIBAg&c=CJqEzB1piLOyyvZjb8YUQw&r=QWa4FYrGl2z7tyOHBIYcegdYaNKy_NApZOlUL0J3DAI&m=U0h7CvSrGo84Dcp2l9ksvTIjRAz93gEI1DoJYrNskJW6O3n-D4BvXACmk7_lCVox&s=oHCIemsXaYK6DXaH6ufh-8_RnQqK55wLu2t54a3xanU&e=</a><br>
><br>
> Comments and suggestions are welcome. If you like to<br>
> have writing permission, just let me know.<br>
><br>
> Thanks, Marco.<br>
><br>
> _______________________________________________<br>
> Clas12_rgh mailing list<br>
> Clas12_rgh@jlab.org<br>
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