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["Montag, Christoph" <montagc AT bnl.gov>]

All,

Please find attached a set of slides on transverse electron tails that I presented at an IR design meeting last summer. This is for a linear one-turn matrix with beam-beam and synchrotron radiation damping/quantum excitation, no beam-gas yet.

A nominal 15 sigma aperture seems to accommodate "all" tails in most cases, but I do not know yet how to interpret most of those contour plots. At some point, contours simply seem to have "zero" distance in certain areas of the amplitude space, but I don't see any physics that would result in a sharp "edge".

The code has been benchmarked against a published result for PEP (or PEP-II - don't remember right now?), and there the contours are clearly separated. In that case, the beam was much flatter at the IP, which may or may not explain the qualitative difference between EIC and PEP. I will generate a set of plots while scanning the "flatness" in the EIC case; maybe that will shed some light on the issue of contour lines collapsing into a single one.

Christoph

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From: E-rhic-ir-l <e-rhic-ir-l-bounces AT lists.bnl.gov> on behalf of Kyle Capobianco-Hogan via E-rhic-ir-l <e-rhic-ir-l AT lists.bnl.gov>
Sent: Friday, January 17, 2020 5:11 PM
To: eRHIC IR Mailing List <e-rhic-ir-l AT lists.bnl.gov>
Subject: [E-rhic-ir-l] eRHIC IR Design Meeting, Friday, January 17, 2019

 

Attached are the draft minutes from today's eRHIC IR Design Meeting (also available on SharePoint).

Regards,

Kyle

Kyle G. Capobianco-Hogan | Applications Analyst

ph: (631) 344-4695

Brookhaven National Laboratory

Superconducting Magnet Division

Bldg. 902 - P.O. Box 5000

Upton, NY 11973-5000

Attachment: electron-tails-26July2019.pdf
Description: electron-tails-26July2019.pdf