Long term projections summary€¦ · Guy Wormser, Background workshop 24 Sep 2003 Long term...

Guy Wormser, Background workshop 24 Sep 2003

Long term projections summary

zThe background projectionszBABAR scorecard for today, 2004, 2006,

2009zInjection issueszData quality issueszConclusionsGuy Wormser, LAL Orsay


The background projections

z All based on Feb 2002 dedicated data takingyProved essential for understanding and planning. Need to be

redone before end of 2003. Data taking program and procedures need to be carefully planned

z Parametrizations not yet fully uniform across subdetectors: We will getthere!y « Creative » DCH parametrization leads to ~25% overestimate OK

z How to describe (and extrapolate) the residual term:Background-single Her-single ler-lumi?y Existence of a linear cross termy Beam-beam effects

z Very successful description of background from Feb 2002 to April 2003y New tunes led to extra luminosity (+30%) and extra backgrounds(+50-100%)

⌧ Problem : The consequences of this step are just found now!

z We have always to consider worst case scenarios: safety factor is needed


BABAR scorecard today

TODAYRadiation damage Operation Data Quality

SVT x xDCHDRC fixedEMC - ?IFR x x xTRGDAQSVTRAD x x

X: visible effect with non-zero impact - : visible effect with no impact

? : yet unknown fixed: det upgrade to fix a significant issue


MID Dose Rates until 2009Use Seeman model for beam currents to predict dose rates:

Dose rates do not looking forbiddingly highRates peak at roughly the current soft abort limits- DQ should still be reasonable


Non-MID Dose Rates until 2009

• For TOP and BTM diodes both 2002 and 2001 models were used

• The 2001 models with second order terms are up to 100%

• Effect on integrated doses will be less than 30%

• Use 2002 model for prediction non-MID diode doses


Midplane Doses until 2009• Module exchange in 2005 looks well timed with 4 Mrad budget

• One rotation in 2007 should be able to keep MID modules installed in 2005 below 5 Mrad

A rotation will move the high dose in FE:MIDto other module


BABAR scorecard July 2004

July 2004Radiation damage Operation Data Quality

SVT X? xDCH XDRC fixedEMC - ??IFR x X XTRGDAQSVTRAD x improved


IFR issues


Beam-Beam issues in IFR


IFR and beam loss monitor


DCH data rate issue


BABAR scorecard July 2006

July 2006Radiation damage Operation Data Quality

SVT fixed xxDCH TO BE FIXEDDRC fixedEMC - ???IFR fixed fixed fixedTRGDAQSVTRAD fixed fixed


BABAR scorecard 20092009

Radiation damage Operation Data QualitySVT X xxxDCH fixedDRC fixedEMC X ????IFR X X XTRG XDAQ XSVTRAD fixed fixed



Injection issues

zDoseszAbortsyLost lumiyextra doses!

zDurationszQuality measurement zOffile studies


Injection issues


2003 Doses in Numbers

FW FE BW BET O P 8 1 ( 1 4 % ) 52 (41%) 1 0 0 ( 9 % )MID 374 (63%) 333 (67%) 488 (66%) 215 (65%)BTM 9 0 ( 3 0 % ) 5 9 ( 3 8 % ) 82 (20%) 58 (45%)

25 (55% )

Numbers are in krad, (%) is of dose in stable beams

• Dose during stable beam is almost completely in MID plane

• Radiation comes from lost particles

• Injections tend to have more uniform radiation pattern

• Mainly coming from HER injection and into west diodes

Radiation doses from January to June 2003:


Data quality issues

zFaster feedback on PHYSICS quantitiesy« Intermediate » physicsy« Journal quality » results

zDefine criteriazEMC-related analysis still lackingzHave long term physics goals in mindy( Trigger, EMC, etc..)





Conclusions

z We have to look far ahead: Minimum 3 yearsz Look for worst case scenarios!z Look for end-product effects!z BABAR issuesy Immediate concern: SVT ATOM chipyNext on-line: DCH DAQy Longer term issues: SVT and EMC in 2008

z Changes in background issuesy Beam-beam tailsy injectionsy trapped events

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Long term projections summary€¦ · Guy Wormser, Background workshop 24 Sep 2003 Long term...

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