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Accelerators and other things

Accelerators and other things. Roger Barlow Manchester Christmas Meeting 2005/6. Accelerators: PEPII and TURTLE. Poster at PAC05. Where do BaBar backgrounds come from?. Wake Fields. Beam particles passing through an aperture produce image charges and currents

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Accelerators and other things

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  1. Accelerators and other things Roger Barlow Manchester Christmas Meeting 2005/6

  2. Accelerators: PEPII and TURTLE Poster at PAC05 Where do BaBar backgrounds come from? Roger Barlow

  3. Wake Fields • Beam particles passing through an aperture produce image charges and currents • Image charges and currents push beam particles around • Big concern for Linear Collider Roger Barlow

  4. Wake fields Predict experimental results if 5th order used Roger Barlow

  5. More Wake Fields Circular Aperture:Kick on one particle due to another (mrmr’mWm(s)Cos m-’) Wake effect can be coded as m(trailing particle)xAperture(s)x(Leading slice) What about rectangular aperture?? Complicated Roger Barlow

  6. BaBar splitoff software Complicated Try out simple implementation of Debbie Bard’s photon/splitoff Neural Net discriminator All cluster-pair masses (E>0.5 GeV) and those for which either has quality<0.5 Roger Barlow

  7. BaBar analysis t± 3p±p0n over to Tim – who promised a talk! Roger Barlow

  8. BaBar Grid - utilitiesWrapper for unmemorable ldap bash-2.05b$ BbgWho Names of BaBar VO members =========================== Artem Trunov Walter Toki Dr J A Nash Dominique Boutigny … bash-2.05b$ BbgWhere List of all sites available to the BaBar VO ====================================== gridce.sns.it: with 10 CPUs available gridba2.ba.infn.it: with 88 CPUs available ce3.egee.unile.it: with 3 CPUs available Grid10.fe.infn.it: with 20 CPUs available lcg-gridka-ce.fzk.de: with 1145 CPUs available …………….. Roger Barlow

  9. BbgCERNUI Sets up the user interface even in a grid-free environment (e.g.SLAC) [noric08]~/analysis25 > grid-proxy-init grid-proxy-init: Command not found. [noric08]~/analysis25 > source BbgUtils/BbgCERNUI your operating system is sl3 your shell is tcsh [noric08]~/analysis25 > grid-proxy-init Your identity: /O=Grid/O=UKHEP/OU=hep.man.ac.uk/CN=Roger Barlow Enter GRID pass phrase for this identity: Roger Barlow

  10. BaBar+Grid Idiot-proofing James’ easyroot: analysis of TauUser ntuples using the local BaBar farm via the grid We have disk space and CPUs and the knowledge and the need… Roger Barlow

  11. BaBar Statistics As of Dec 05 - joint convenor of BaBar Statistics Working Group (with Ilya Narsky). Rôle in encouraging good practice Roger Barlow

  12. Asymmetric Errors • Shows bias resulting from combination of 2 typical asymmetric (Poisson) results using 8 different methods • ‘Standard’ method is clearly not the best • See PHYSTAT05 Roger Barlow

  13. D ln L=-1/2? • Error estimates for a lifetime measurement from a small number of results • Solid line is correct. Dashed line is usual. Dotted is Bartlett Approximation Roger Barlow

  14. Coverage… • How I spent the Xmas break.. • To appear in PHYSTAT05 proceedings Roger Barlow

  15. CALICE R and D towards a very high granularity Silicon/Tungsten ECAL for the Linear Collider Also HCAL designs being considered Very nice detector Mainstream design Manchester in at the start Roger Barlow

  16. Bid to PPARC • Went to PPARC in February • Asked for £2.5M over the next 3 years for 5 workpackages • Iterations between committees • Emerge with delayed scheme costing £2.7M over the next 4 years • EuDet makes up a lot of the shortfall Roger Barlow

  17. Workpackage 4: Thermal+Mechanical • Manchester with Roger Barlow in charge • Work with École Polytechnique (and Lyon?) • Glue studies (literature + ageing). Radiation? • Thermal simulations – need information on design details • Thermal measurements to validate simulations + cooling design • Assembly robot: pattern recognition and placing for 24,000,000 pads Roger Barlow

  18. In the UK CALICE project we WP4, the Thermal and Mechanical Work Package, and part of WP2, the DAQ package. Roger Barlow

  19. CALICE - Mechanical • Work started (Ray Thompson, Julian Freestone) • Literature being looked at • Glue currently used is Epotech E4110 (used by GLAST) Thermal Cycling: we have the programmable oven Roger Barlow

  20. HEPP+EPS • Finished term as IoP HEPP group chair • 3 good conferences (Durham, Birmingham, Dublin) • Started new no-losers HEPP prize for Particle Physics • Re-started Newsletter (help from Christina) • Vibrant series of half day conferences (including Manchester last November) • EPS conference HEPP2007 on the way Roger Barlow

  21. Next Year The mixture as before plus: • Accelerator projects: Super B, ATF2, FFAG • Statistics: BaBar SWG + Banff workshop. Asymmetric Errors • CALICE: Get busy (+ Dave Bailey) • BaBar Grid: now in demand Roger Barlow

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