[Rgc_analysis] [EXTERNAL] [Rgc] cooked runs & RGC-analysis meeting tomorrow

Mon Apr 10 11:13:20 EDT 2023

Dear Timothy,

what I had in mind is based on the derivations in Section III of this document:
https://userweb.jlab.org/~kuhn/RGC/RunPlan_FTon2.pdf
Admittedly, it is a bit awkward to have this attached to the run plan for 2023, but the basic ideas are there:
Use MEASURED yields from ALL targets (including empty without LHe - foils only -, empty WITH LHe, C, CH2, CD2 as well as NH3 and ND3) to extract the dilution factor experimentally. That way, it’s not necessary to have a specific model or reaction in mind - just use the same analysis code for those different targets to accumulate counts in the same relevant bins to get the dilution factor in each bin. (It may be true that more complicated final states with many-dimensional bins have to modify this somewhat to get enough statistics).

2 caveats:
1) I haven’t included the thickness l and density rho for the CD2 powder in my table on p. 8 - we will have to ask the target group to give us their best estimate for these. Otherwise, treating dilution for ND3 is the same as Eq. 13, simply replacing CD for CH and ND3 for “A” (ammonia).
2) In principle, the measured counts would have to be corrected for different amounts of pre-scattering radiative energy losses of the incoming electron, as well as radiative losses for the outgoing electron, since not all auxiliary targets have the same radiation thickness as the ammonia ones (we tried to keep C, CH2 and CD2 close, though). These corrections could come from a full-blown GEMC simulation with a radiated generator and initial electron energy distribution. However, the effect should be small, especially for exclusive channels.

Let me know if anything is unclear or you have more questions.

Greetings - Sebastian

On Apr 10, 2023, at 8:13 AM, Hayward, Timothy <timothy.hayward at uconn.edu<mailto:timothy.hayward at uconn.edu>> wrote:

Dear Sebastian,

I was wondering if you could expand a little bit on what you had in mind for #3 “Generic dilution factor code”, specifically the “generic” part. Won’t everyone want to check the factor for their specific analysis? I think this is something I would be interested in contributing to when I understand your ideas a little better.

Best,
Timothy

On Apr 3, 2023, at 11:29 AM, Sebastian Kuhn via Rgc_analysis <rgc_analysis at jlab.org<mailto:rgc_analysis at jlab.org>> wrote:

*Message sent from a system outside of UConn.*

Thank you, Silvia,

Can I piggyback on this email to request that ALL potentially interested RG-C analyzers, whether they can attend tomorrow’s meeting or not, send a few lines expressing their interest (what channels they want to analyze, who they are working with), including whether this is a thesis project, and their availability to help with general RG-C calibration and analysis tasks.

Here are some examples of the latter from my parochial point of view - please add whatever else you can think of:
1) Complete NMR polarization history for all NH3 and ND3 targets
2) Raster calibration
3) Generic dilution factor code
4) Beam charge asymmetry and FC readout issues

- Sebastian

On Apr 3, 2023, at 10:05 AM, Silvia Niccolai via Rgc <rgc at jlab.org<mailto:rgc at jlab.org>> wrote:

Dear all,
the NH3 (+carbon) runs that were requested at last week's meeting were
cooked and can be found in:
/volatile/clas12/rg-c/production/dst/8.7.0_TBT/
The trains will soon also be copied to the /cache/hallb/scratch/rg-b/ to
avoid losing them once that they're erased from /volatile/

Tomorrow (Tuesday April 4th) we'll have our RGC-analysis meeting, at
8:30AM Jlab time, zoom: https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjlab-org.zoomgov.com%2Fj%2F1601890334&data=05%7C01%7Ctimothy.hayward%40uconn.edu%7Ca53a9dc78d154e5e9a5008db34584990%7C17f1a87e2a254eaab9df9d439034b080%7C0%7C0%7C638161326023723419%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Te%2Bf0jNvd4Nwum%2Fhk1nIwtfIshpu2c47BLjVbP1M4EE%3D&reserved=0<https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1601890334&d=DwMGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=cvGaa-sH-cjAi4BvycGtCA&m=7aUmVg3API7HSSe10Ann8_jFHfP7jMGjhqN83dDU4WanHWFAFjIwnyoEaP95118y&s=5CdHE5C_uIcKVyW4Zngtlt1ORyDqOI3UVdleXOnb4xk&e=>
Please let me know if you plan to present/discuss anything. And if you do,
please upload your material on our wiki at the link:
https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fclasweb.jlab.org%2Fwiki%2Findex.php%2FRGC_Apr4&data=05%7C01%7Ctimothy.hayward%40uconn.edu%7Ca53a9dc78d154e5e9a5008db34584990%7C17f1a87e2a254eaab9df9d439034b080%7C0%7C0%7C638161326023723419%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=wMFr3bEh3vvZtv%2BsaELXL4WF3k1Zn89srRJJkW5W5ww%3D&reserved=0<https://clasweb.jlab.org/wiki/index.php/RGC_Apr4>

See you tomorrow.
Best regards,
Silvia

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