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