long term projections summary€¦ · guy wormser, background workshop 24 sep 2003 long term...
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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
Guy Wormser, Background workshop 24 Sep 2003
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
Guy Wormser, Background workshop 24 Sep 2003
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
Guy Wormser, Background workshop 24 Sep 2003
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
Guy Wormser, Background workshop 24 Sep 2003
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
Guy Wormser, Background workshop 24 Sep 2003
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
Guy Wormser, Background workshop 24 Sep 2003
BABAR scorecard July 2004
July 2004Radiation damage Operation Data Quality
SVT X? xDCH XDRC fixedEMC - ??IFR x X XTRGDAQSVTRAD x improved
Guy Wormser, Background workshop 24 Sep 2003
IFR issues
Guy Wormser, Background workshop 24 Sep 2003
Beam-Beam issues in IFR
Guy Wormser, Background workshop 24 Sep 2003
IFR and beam loss monitor
Guy Wormser, Background workshop 24 Sep 2003
DCH data rate issue
Guy Wormser, Background workshop 24 Sep 2003
BABAR scorecard July 2006
July 2006Radiation damage Operation Data Quality
SVT fixed xxDCH TO BE FIXEDDRC fixedEMC - ???IFR fixed fixed fixedTRGDAQSVTRAD fixed fixed
Guy Wormser, Background workshop 24 Sep 2003
BABAR scorecard 20092009
Radiation damage Operation Data QualitySVT X xxxDCH fixedDRC fixedEMC X ????IFR X X XTRG XDAQ XSVTRAD fixed fixed
Guy Wormser, Background workshop 24 Sep 2003
Guy Wormser, Background workshop 24 Sep 2003
Injection issues
zDoseszAbortsyLost lumiyextra doses!
zDurationszQuality measurement zOffile studies
Guy Wormser, Background workshop 24 Sep 2003
Injection issues
Guy Wormser, Background workshop 24 Sep 2003
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:
Guy Wormser, Background workshop 24 Sep 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..)
Guy Wormser, Background workshop 24 Sep 2003
Guy Wormser, Background workshop 24 Sep 2003
Guy Wormser, Background workshop 24 Sep 2003
Guy Wormser, Background workshop 24 Sep 2003
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