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I'm putting together (what I hope is a) definitive note on pile-up in high energy hadron colliders, but another issue came up recently that we should probably add to the table. From the detector standpoint, it's not just the pile-up that's important, but the *linear multiplicity density*. For example, we've been saying for the last three years that we would level the luminosity in the HL-LHC with crab cavities. Someone finally noticed that while that lowers the total pile-up, it also shortens the overlap region, so the linear density remains the same and it's just as hard to distinguish individual interactions! Now the plan is to use some other technique for leveling. We should probably say something about the bunch length for the detector simulation folks. If this turns out to be important, we could consider techniques to lengthen the bunches and mitigate the effect. Cheers, Eric On Mar 7, 2013, at 12:40 AM, Peskin, Michael E. wrote: > Dear Colleagues, > > Finally, everyone concerned has gotten back to me, and we are ready to post the > "Official Energy Frontier Facilities List". The purpose of this list is to insure that > all studies of a given machine are done with the same energy and luminosity > assumptions, and that these assumptions are reasonable. > > You can find the list at: > > http://www.snowmass2013.org/tiki-index.php?page=EF+Facilities+List > > It is linked from the top Energy Frontier page. > > I would be grateful if all of you, and especially the Technical Group, would look > at this list one more time before any errors in it become etched in stone. > > Chip and I strongly discourage the study of any machine option that is NOT > on this list. If you have a case for adding another option, please let us know. > > Thanks, > > Michael > > > ------------------------------------------------------------------------------------------- > Michael E. Peskin [log in to unmask] > HEP Theory Group, MS 81 ------- > SLAC National Accelerator Lab. phone: 1-(650)-926-3250 > 2575 Sand Hill Road fax: 1-(650)-926-2525 > Menlo Park, CA 94025 USA www.slac.stanford.edu/~mpeskin/ > --------------------------------------------------------------------------------------------- > ######################################################################## > Use REPLY-ALL to reply to list > > To unsubscribe from the SNOWMASS-EF list, click the following link: > https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=SNOWMASS-EF&A=1 ------------------------------------------------------------------- Eric Prebys, Fermi National Accelerator Laboratory Office: 630-840-8369, Email: [log in to unmask] WWW: http://home.fnal.gov/~prebys ------------------------------------------------------------------- ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the SNOWMASS-EF list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=SNOWMASS-EF&A=1