[Halld-klf-beam] [EXTERNAL] Re: KLF beamline meeting on Thursday, December 12th

[Amaryan, Moskov]

Hi Hovanes,

Thanks for your comments.
I was assuming linear dependence of K_L cross section and
didn't took into account lead absorber listed in Table II of the
SLAC paper. There they listed 147.1 g/cm^2 for tungsten
and 173.0 g/cm^2 for lead. I recalculated Y(K) according
to the formula on the page 712 of the SLAC paper and found that the ratio of 14cm
tungsten plug compared to the SLAC W+Pb (for now I ignored
 the low atomic mass absorbers) is about 4 times in favor of KLF.
which means my 1.2x10^4 K_L/s will increase and rise to 9.6 K_L/s.
This means that even if we don't increase r.l. of radiator and use 10% r.l. We will still have
4.8 K_L/s on cryo targets of KLF even with 5cm beam diameter.

The question about electro- vs photo-production is simple as we are using their  calculated
yield and using essentially electroproduction  in a two step processes to estimate the yield of K_L.



Best regards,
Moskov.




 Dr. Moskov Amaryan
Eminent Scholar and Professor of Physics
Old Dominion University
Norfolk, VA 23529​

Phone: 757-683-4614
    Fax: 757-683-3038
________________________________
From: Hovanes Egiyan <hovanes at jlab.org>
Sent: Sunday, December 15, 2024 5:37 PM
To: Amaryan, Moskov <MAmaryan at odu.edu>; halld-klf-beam at jlab.org <halld-klf-beam at jlab.org>
Subject: Re: KLF beamline meeting on Thursday, December 12th


EXTERNAL to ODU: This email is not from an ODU account. Do not click links or open attachments unless you recognize the sender and know the content is safe.

Hi Moskov,

I have a couple of comments about the estimate of kaon flux using the electroproduction article from SLAC.


  1.
I think it is a very good idea to link our kaon flux estimate to real data. The SLAC article in Ref [2] of your PDF file is about electroproduction, while the only factor in your estimate that tries to account for the fact that we are doing photoproduction with a 20% radiator is that factor of 0.2. I think the proper way to use these data to predict photoproduction yields would be to have an electroproduction model that reproduces or fits these SLAC data, then try to use the amplitudes or structure functions in this model for photoproduction case. Otherwise, it is hard to be confident that we will get the right answer within a factor of two by simply guessing a correction factor. Another thing that could be done, although I am not sure if it is doable since I have never done it myself, is to integrate the virtual photon flux Γ in electroproduction within some reasonable range of small Q2 and some W-range that are applicable to the SLAC experiment to try to relate these data to photoproduction with a know photon flux.
  2.
The difference in the tungsten plug thickness of a factor of 2 will result in a kaon flux reduction/increase factor of e2~7.4 , as the flux depends exponentially on the thickness of the tungsten (see formula for the yield YK(pK) in that SLAC article). But my impression was that they had multiple absorbers at the same time, including 27 radiation lengths of lead. So I do not think our absorber is thicker than what SLAC had.

Best,
      Hovanes.


________________________________
From: Amaryan, Moskov <MAmaryan at odu.edu>
Sent: Sunday, December 15, 2024 2:01 PM
To: Hovanes Egiyan <hovanes at jlab.org>; halld-klf-beam at jlab.org <halld-klf-beam at jlab.org>
Subject: [EXTERNAL] Re: KLF beamline meeting on Thursday, December 12th

Dear all,

I tried to make some estimation of
the KL flux based on SLAC measurements.
Please see my file in the attachment.
If I am correct then the proposed flux of
~10^4 is achievable.
Please let me know if I am missing something.

Best regards,
Moskov.

 Dr. Moskov Amaryan
Eminent Scholar and Professor of Physics
Old Dominion University
Norfolk, VA 23529​

Phone: 757-683-4614
    Fax: 757-683-3038

________________________________
From: Halld-klf-beam <halld-klf-beam-bounces at jlab.org> on behalf of Hovanes Egiyan <hovanes at jlab.org>
Sent: Thursday, December 12, 2024 9:06 PM
To: halld-klf-beam at jlab.org <halld-klf-beam at jlab.org>
Subject: Re: [Halld-klf-beam] KLF beamline meeting on Thursday, December 12th


EXTERNAL to ODU: This email is not from an ODU account. Do not click links or open attachments unless you recognize the sender and know the content is safe.

Hi,

I posted munutes of today's meeting on the wiki.

https://wiki.jlab.org/klproject/index.php/KLF_beamline_meeting_-_December_12,_2024#Minutes

Best,
      Hovanes.

________________________________
From: Halld-klf-beam <halld-klf-beam-bounces at jlab.org> on behalf of Hovanes Egiyan <hovanes at jlab.org>
Sent: Tuesday, December 10, 2024 9:06 AM
To: halld-klf-beam at jlab.org <halld-klf-beam at jlab.org>
Subject: [Halld-klf-beam] KLF beamline meeting on Thursday, December 12th

Hi,

We will have a KLF beamline meeting on Thursday, December 12th , at 9am using Zoom (see information below). I posted the preliminary agenda of the meeting on the KLF wiki:

https://wiki.jlab.org/klproject/index.php/KLF_beamline_meeting_-_December_12,_2024#Agenda

Please, feel free to add items to the agenda or let me know if you would like to discuss a topic.

Best,
      Hovanes.


Join ZoomGov Meeting
https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1606674688-3Fpwd-3Db3dnTzJWVEtxZExGRnFoY29PSGkxQT09&d=DwIGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=J4JUozS2XNDIF5fcVFTrIgIEo_WrVT6dPBhfLrnkU9k&m=XOu63AA4nGPbg_do8rHQq0DHGiFNxfMkBodSR6ECpQy3mDHGmlyLMF42tevQsp1-&s=ZdSkV8mbTn_HasXG40P9d726pQyLFzJMsJi2UyOGMYg&e= 

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