Accelerators and other things

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?
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

4
Wake fields
Predict experimental results if 5th order used
5
More Wake Fields

• Circular ApertureKick on one particle due to
  another
• ?(?mrmrmWm(s)Cos m??-??)
• Wake effect can be coded as
• ?m(trailing particle)xAperture(s)x(Leading slice)
• What about rectangular aperture??

Complicated
6
BaBar splitoff software
Complicated

• Try out simple implementation of Debbie Bards
  photon/splitoff Neural Net discriminator
• All cluster-pair masses (Egt0.5 GeV) and those for
  which either has qualitylt0.5

7
BaBar analysis

• t ? 3pp0n over to Tim
• who promised a talk!

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 ..
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BbgCERNUI

• Sets up the user interface even in a grid-free
  environment (e.g.SLAC)
• noric08/analysis25 gt grid-proxy-init
• grid-proxy-init Command not found.
• noric08/analysis25 gt source BbgUtils/BbgCERNUI
• your operating system is sl3
• your shell is tcsh
• noric08/analysis25 gt grid-proxy-init
• Your identity /OGrid/OUKHEP/OUhep.man.ac.uk/CN
  Roger Barlow
• Enter GRID pass phrase for this identity

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BaBarGrid
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
11
BaBar Statistics

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

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

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

14
Coverage

• How I spent the Xmas break..
• To appear in PHYSTAT05 proceedings

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
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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

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Workpackage 4 ThermalMechanical

• 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

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

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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

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HEPPEPS

• 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

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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