Accelerators and other things
Roger BarlowManchester Christmas
Meeting 2005/6
Roger Barlow 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 asm(trailing particle)xAperture(s)x(Leading slice)
What about rectangular aperture??
Roger Barlow 6
BaBar splitoff software
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
± 3±0 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$ BbgWhereList 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
BbgCERNUISets up the user interface even in a grid-free
environment (e.g.SLAC)
[noric08]~/analysis25 > grid-proxy-initgrid-proxy-init: Command not found.[noric08]~/analysis25 > source BbgUtils/BbgCERNUIyour operating system is sl3your shell is tcsh[noric08]~/analysis25 > grid-proxy-initYour identity:
/O=Grid/O=UKHEP/OU=hep.man.ac.uk/CN=Roger BarlowEnter 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
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 detectorMainstream designManchester 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.
• •
•
Task People Deliverable Date Progress/remarks
Glue studies RayJulian
Report on glue availability and characteristics
Xmas
Glue Aging Ray Julian Andy
Report on aging properties found using thermal cycling in programmable oven
First results by Xmas, final by summer 06
Prototype assembly procedures
Ray Julian
Demonstrations 2006
Heat flow simulation
Steve Plots Some by Xmas, more in 2006
Awaiting data on what to simulate
Thermal Measurements
Mike Measurements to confirm simulations
2006
Assembly Robot Design
Ray Julian
Design and prototype sometime? What does the collaboration want?
Networking Studies
Marc Richard
Studies of online to offline switch performance
2006/7 Acquiring new Virtex-4 based card
Complete FPGA firmware
Marc Updated program allowing full use of memory
Spring Needed for CERN testbeam run
Cooling Ray Design(s) 2006/7
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