Subject:
Minutes of APD meeting 05/16/07
From:
Vladimir Shiltsev <shiltsev@fnal.gov>
Date:
Thu, 17 May 2007 10:07:55 -0500
To:
Vladimir Shiltsev <alexahin@fnal.gov>, Dixon Bogert <bogert@fnal.gov>, Jean-Paul Carneiro <carneiro@fnal.gov>, church@Fnal.gov, David Johnson <dej@fnal.gov>, Alexandre Drozhdin <drozhdin@fnal.gov>, Eliana Gianfelice <eliana@fnal.gov>, gelfand@fnal.gov, Gennady Kuznetsov <gkuznetsov@fnal.gov>, "John A. Johnstone" <jjohnstone@fnal.gov>, Michael Kriss <kriss@fnal.gov>, Dave Wildman <wildman@fnal.gov>, Nikolai Mokhov <mokhov@fnal.gov>, Noriaki Nakao <nakao@fnal.gov>, Francois Ostiguy <ostiguy@fnal.gov>, piot@fnal.gov, Igor Rakhno <rakhno@fnal.gov>, Bob Zwaska <zwaska@fnal.gov>, Jean Slaughter <slaughter@fnal.gov>, Sergei Striganov <strigano@fnal.gov>, Tanaji Sen <tsen@fnal.gov>, Vsevolod Kamerdzhiev <vsevolod@fnal.gov>, Bob Webber <webber@fnal.gov>, Vladimir Shiltsev <alvin@fnal.gov>, Giorgio Apollinari <apollina@fnal.gov>, Vladimir Shiltsev <burov@fnal.gov>, Cheng-Yang Tan <cytan@fnal.gov>, "Elvin Harms, Jr." <harms@fnal.gov>, Andreas Jansson <jansson@fnal.gov>, Elliott McCrory <mccrory@fnal.gov>, Sergei Nagaitsev <nsergei@fnal.gov>, "Ostroumov, Peter N." <ostroumov@anl.gov>, "Roger L. Dixon" <roger@fnal.gov>, Michael Syphers <syphers@fnal.gov>, vs <val@fnal.gov>, Alexander Valishev <valishev@fnal.gov>, James T Volk <volk@fnal.gov>, Shavkat Singatulan <singatul@fnal.gov>, Vaia Papadimitriou <vaia@fnal.gov>

1. Bob Zwaska recently attended Ecloud'07 in Korea where several interesting results were reported:
a) grooved beam pipe was tested at PEP-II and did NOT suppress ecloud; b) irradition of surface by few kV electrons (mC to C/mm2) greatly reduced SEY - at PSI and KEK; c) long-living electrons (~100us instead of typical 10 ns) detected in LANL PSI quadrupoles. Bob plans to upgrade e-cloud detectors in MI and install ~1m long beam pipe with suppression electrode at the bottom - to test the idea.

2. GL reports :a) Nikolai - MI Lambertson septa loss simulated and orbit bump suggested (S.D.), MTA 400MeV target (NM); K.Goudima(visitor, just left) has built quark-gluon stream model into MARS; N.M. gives 1-day MARS tutorial 05/24; b) Yuri - L.V. runs ORBIT to model PSR and Booster; new helix was introduced in the Tev at 150 GeV to improve lifetime after sextupole modifications; YA works on muon cooling channel code; c) Mike C. - there will be an ILC accelerator school at the end of July - sign up, please!; d) Tanaji - HJKim simulates RHIC wire experiments; JJ considers possibilities of slim magnets for LHC upgrades; TS works on Diffraction Radition monitor idea.

3. Dave Wildman reported successful results of MI studies with 7kV 400 ns barrier buckets (one stationary, another slips 42rfc/Booster tick) - 2,6,8,10 Booster batches were injected and
adiabatically captured by 53MHz RF. The method is alternative to Slip-Stacking and promises
possibility of 12-13 batch injection (vs 11 in SS), less losses at the start of MI acceleration and
looks very suitable for RR in NoVA era. Next steps - inject with more (than 1) Booster turns and attempt acceleration.

4. Francois discovered a way to increase speed of high order map mxyzpltk simulations by factor of 100-1000 using monomial indexing. Now 8th order Booster map calculation takes only 365 sec on a good PC. It's a big boost for CHEF.

all slides available in beams-doc-2780