Long term projections summary

Transcription

1 Long term projections summary The background projections BABAR scorecard for today, 2004, 2006, 2009 Injection issues Data quality issues ConclusionsGuy Wormser, LAL Orsay

2 The background projections All based on Feb 2002 dedicated data taking Proved essential for understanding and planning. Need to be redone before end of Data taking program and procedures need to be carefully planned Parametrizations not yet fully uniform across subdetectors: We will get there! «Creative» DCH parametrization leads to ~25% overestimate OK How to describe (and extrapolate) the residual term:background-single Her-single ler-lumi? Existence of a linear cross term Beam-beam effects Very successful description of background from Feb 2002 to April 2003 New tunes led to extra luminosity (+30%) and extra backgrounds( %) Problem : The consequences of this step are just found now! We have always to consider worst case scenarios: safety factor is needed

3 BABAR scorecard today TODAY Radiation damage Operation Data Quality SVT x x DCH DRC fixed EMC -? IFR x x x TRG DAQ SVTRAD x x X: visible effect with non-zero impact - : visible effect with no impact? : yet unknown fixed: det upgrade to fix a significant issue

4 MID Dose Rates until 2009 Use Seeman model for beam currents to predict dose rates: Dose rates do not looking forbiddingly high Rates peak at roughly the current soft abort limits - DQ should still be reasonable

5 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

6 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:MID to other module

7 BABAR scorecard July 2004 July 2004 Radiation damage Operation Data Quality SVT X? x DCH X DRC fixed EMC -?? IFR x X X TRG DAQ SVTRAD x improved

8 IFR issues

9 Beam-Beam issues in IFR

10 IFR and beam loss monitor

11 DCH data rate issue

12 2006 July 2006 Radiation damage Operation Data Quality SVT fixed xx DCH TO BE FIXED DRC fixed EMC -??? IFR fixed fixed fixed TRG DAQ SVTRAD fixed fixed

13 BABAR scorecard Radiation damage Operation Data Quality SVT X xxx DCH fixed DRC fixed EMC X???? IFR X X X TRG X DAQ X SVTRAD fixed fixed

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15 Injection issues Doses Aborts Lost lumi extra doses! Durations Quality measurement Offile studies

16 Injection issues

17 2003 Doses in Numbers Radiation doses from January to June 2003: FW FE BW BE TOP 81 (14%) 52 (41%) 100 (9%) 25 (55%) MID 374 (63%) 333 (67%) 488 (66%) 215 (65%) BTM 90 (30%) 59 (38%) 82 (20%) 58 (45%) 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

18 Data quality issues Faster feedback on PHYSICS quantities «Intermediate» physics «Journal quality» results Define criteria EMC-related analysis still lacking Have long term physics goals in mind ( Trigger, EMC, etc..)

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22 Conclusions We have to look far ahead: Minimum 3 years Look for worst case scenarios! Look for end-product effects! BABAR issues Immediate concern: SVT ATOM chip Next on-line: DCH DAQ Longer term issues: SVT and EMC in 2008 Changes in background issues Beam-beam tails injections trapped events