Subject:
Minutes of APD mtg 1/24/07
From:
Vladimir Shiltsev <shiltsev@fnal.gov>
Date:
Thu, 25 Jan 2007 17:08:18 -0600
To:
Vladimir Shiltsev <alexahin@fnal.gov>, Dixon Bogert <bogert@fnal.gov>, 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>, mauede <mauede@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>, wildman@fnal.gov
CC:
Vladimir Shiltsev <alvin@fnal.gov>, 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>, lebrun@fnal.gov

1. Vladimir informed about e-cloud workshop in Indiana Univ (Mar 12-15, 2007) http://physics.indiana.edu/~shylee/ap/mwapc/epws.html (let me know if you're interested).

2. Paul Lebrun shared his impressions of the ILC LET (low emittance transport) workshop which took place last week in the UK :
the 5 GeV  LET should be stable to 7nT @ few kHz, static main linac beam alignment is Ok but dynamic simulations (things change in time) still need to be done; results of linac simuations by CHEF somehwat disagree with other 5 codes - Francois and others are looking into that (see doc-2589).

3. GL reports: a) Yuri - TEL2 studies continue and get more encouraging data, Eliana worked out low alpha MC lattice with 108 deg/cell; Yuri found space-charge compensation in the Booster not very encouraging with just 1 or 2 electron lenses - lattice perturbations too large (will look into 3 TELs or whether faster gamma-t quads can help); b) Mike C. - Tan works on dark current kicker, Francois looks into wakefield problems in the ILC cavities; 25% ILC cost reduction was reported at the recent MAC - due to fewer DRs (2 vs 3) and only 1 DR tunnel vs 2; c) Bob W. - 325 MHz klystron modulator  in MDB works( ! ), so far at 2kV out of 10 max; Jean Paul will give AD seminar Feb 8; d) Tanaji - LHC@FNAL will be open Feb 8 (ceremony Feb 12; John Johnstone
found some problems in the LHC Q0 IR upgrade design.

4. Sergei Striganov reported his recent work (doc-2623): a) he studied muon background in the ILC BDS, looked into possibility
of using 11 smaller (4m long) and cheap donut muon spoilers instead of few really big ones - it seems to be OK, special arttention to disagreement between MARS and another (simpler?) Lu Keller's code (difference ~x7 in the bending sections) - to be resolved; b) simulations for MERIT experiment which employes 1cm dia liquid Hg target  placed across 4MW proton beam at 100mrad angle in 15 T magnetic field to generate ~0.1 muon/proton - energy spectra calculated, possibilities for diagnostic devices proposed.