Guy Wormser, MDI BABAR France 20 Nov 2003 PEP-II et BABAR zMotivations zLétat actuel de PEP-II zLes problèmes liés au bruit de fond machine zQuelques résultats récents sur la machine zConclusions

Guy Wormser, MDI BABAR France 20 Nov 2003 Motivations zEté 2003: Retard significatif de BABAR/PEP-II par rapport à BELLE/KEKB yLuminosité pic (10**33) 10.2 vs 6.5 yLuminosité intégrée(fb-1) 160 vs 130 yLumintégrée par jour (pb-1) 500 vs 300 zLa qualité du détecteur BABAR ou lingénuité de ses physiciens ne peut pas rattaper un décalage important en statistique! zEffort indispensable maintenant (ou jamais)

Guy Wormser, MDI BABAR France 20 Nov 2003

Guy Wormser, MDI BABAR France 20 Nov 2003

Guy Wormser, MDI BABAR France 20 Nov 2003 SLAC/PEP-II/BABAR réagissent zCréation de la PEP-II evaluation task force yPlans à court, moyen et long terme pour PEP-II yLutte contre tous les facteurs dinefficacité, fiabilité zConvocation dun Machine Advisory Committee (8-10 Octobre 2003) zCréation du groupe Machine Detector Interface dans la structure de BABAR et de PEP-II (Witold Kozanecki et GW) y(Re)création dun groupe bruit de fond dans BABAR yBABAR background workshop (22-24 Septembre) xhttp:// 03_workshop/agenda_items/agenda.html zRenforcement du groupe PEP-II zIngénieurs opérationnels (RF, vacuum,..) zexperts machine (exemple:J. Gao, LAL)

Guy Wormser, MDI BABAR France 20 Nov 2003 PEP-II Mid-Project Evaluation Resources Ewan Paterson, TD Persis Drell, RD Bill Wisniewski, Babar Resources Ewan Paterson, TD Persis Drell, RD Bill Wisniewski, Babar Parameters, L dt Parameters, L dt John Seeman, Stan Ecklund Jonathan Dorfan, Co-ordinator Lattice/Model Tor Raubenheimer Uli Wienands Vacuum Systems Nadine Kurita Scott DeBarger RF System Ron Akre Ray Larsen Feedback Systems Eric Colby Dmitry Teytelman Reliability/Uptime Roger Erickson Name #2 Machine/Detector Interface Witold Kozanecki Guy Wormser New IR Design Mike Sullivan Name #2 Diagnostics Mark Ross Steve Smith Injection Franz-Josef Decker Name #2 Controls Tom Himel Rusty Humphrey stricly speaking

Guy Wormser, MDI BABAR France 20 Nov 2003 Le plan pour rattraper BELLE

Guy Wormser, MDI BABAR France 20 Nov 2003 Les efforts commencent à payer

Guy Wormser, MDI BABAR France 20 Nov 2003 Létat actuel de PEP-II zTransition importante le au by-2 pattern zCourants importants mais gain en luminosité pas encore complet yEffet faisceau-faisceau en début de fill zNombreux records battus récemment zTest de trickle injection sur 600 pb-1

Guy Wormser, MDI BABAR France 20 Nov 2003

Guy Wormser, MDI BABAR France 20 Nov 2003

Guy Wormser, MDI BABAR France 20 Nov 2003 Pourquoi BABAR doit simpliquer? zBABAR constitue inévitablement un frein à la montée de la luminosité de la machine quil faut limiter au maximum yProtection du détecteur yQualité des données zBABAR engendre une perte defficacité opérationnelle pour la machine quil faut analyser et réduire ySVT aborts, injection inhibits zLes physiciens de BABAR peuvent apporter une aide précieuse à PEP-II yAnalyse des données de la machine yInstrumentation nouvelle construite par des physiciens de BABAR yNouveaux diagnostics fournis par BABAR ySimulation des nouvelles configurations envisagées par PEP-II ySimulations des effets importants pour PEP-II (Touschek, beam-beam)

Guy Wormser, MDI BABAR France 20 Nov 2003 Les conclusion de la BABAR workshop zRéunion très utile zLe groupe Bruit de fond revit! zLongue liste dactions items zExposition de BABAR en fonction du temps

Guy Wormser, MDI BABAR France 20 Nov 2003 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

Guy Wormser, MDI BABAR France 20 Nov 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:MID to other module

Guy Wormser, MDI BABAR France 20 Nov 2003

Guy Wormser, MDI BABAR France 20 Nov 2003 BABAR scorecard today X: visible effect with non-zero impact - : visible effect with no impact ? : yet unknown fixed: det upgrade to fix a significant issue G. Wormser, Bgd Workshop summary, 24 Sep 03

Guy Wormser, MDI BABAR France 20 Nov 2003 BABAR scorecard July 2004 G. Wormser, Bgd Workshop summary, 24 Sep 03

Guy Wormser, MDI BABAR France 20 Nov 2003

Guy Wormser, MDI BABAR France 20 Nov 2003 BABAR scorecard July 2006 G. Wormser, Bgd Workshop summary, 24 Sep 03

Guy Wormser, MDI BABAR France 20 Nov 2003 Data quality issues zFaster feedback on PHYSICS quantities y« Intermediate » physics y« Journal quality » results zDefine criteria zEMC-related analysis still lacking zIFR being used well below its no-background capabilities (external layers off) zHave long term physics goals in mind y( Trigger, EMC, etc..)

Guy Wormser, MDI BABAR France 20 Nov 2003

Guy Wormser, MDI BABAR France 20 Nov 2003 Conclusions zWe have to look far ahead: Minimum 3 years zLook for worst case scenarios! zLook for end-product effects! zBABAR issues yImmediate concern: SVT ATOM chip yNext on-line: DCH DAQ yLonger term issues: SVT and EMC in 2008 zChanges in background issues yBeam-beam tails yinjections ytrapped events

Guy Wormser, MDI BABAR France 20 Nov 2003 Activités récentes du groupe MDI zEtude des aborts SVT (seuils relevés le 14 Octobre 2003) zSuivi du bruit de fond dans les détecteurs BABAR zSimulation de PEP-II zOptimisations des collimateurs zEtudes sur la machine zInformations détaillées de BABAR transmises à PEP-II (Taille et position du faisceau, histogrammes doccupation des détecteurs, étude des données trickle)

Guy Wormser, MDI BABAR France 20 Nov 2003 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

Guy Wormser, MDI BABAR France 20 Nov 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:MID to other module

Guy Wormser, MDI BABAR France 20 Nov 2003 Conclusion zBABAR/PEP-II engagé dans une compétition difficile avec BELLE/KEKB dont lissue est encore incertaine: il faut faire pencher la balance du bon côté! zLeffort MDI est crucial, venez le renforcer yNombreux problèmes, tâches et sujets intéressants identifiés

Guy Wormser, MDI BABAR France 20 Nov 2003 SVT abort & integrated dose summary Manual radiation aborts not included B. Petersen

Guy Wormser, MDI BABAR France 20 Nov 2003 DCH background history M. Kelsey

Guy Wormser, MDI BABAR France 20 Nov 2003 Collimation test in the LER (6 Oct 03): Dmd, DIRC, DCH

Guy Wormser, MDI BABAR France 20 Nov 2003 Evolution of time to inject after an abort January-October Total restart time Tune after fill time HER Prepare to reinject HER injection LER injection LER prepare to reinject

Guy Wormser, MDI BABAR France 20 Nov 2003 Refill times distributions Total time Tune time Her inject Ler inject LER- Prep HER- prep Summary : 28(total) =9 (prep)+15 (inj)+4(tune)

Guy Wormser, MDI BABAR France 20 Nov 2003 Characterization of the injection aborts zBrian Petersen provided tools and plots allowing the statistical study of all injection aborts since January y(Reminder: injection abort is an abort that occurred while PEP state machine flag said injection on (ie no physical requirement of real injection taking place) zComparison with stable beams aborts and injection inhibits y(reminder: Injection is inhibited when a radiation burst occurs within 1 ms of the injection clock)

Guy Wormser, MDI BABAR France 20 Nov 2003 Stable beam aborts characteristics z73 such aborts between January and April z4 types: yType 1: Single peak 45 % yType 2 Peak with a precursor 26% yType 3 base level +peak 20% yType 4 stair-case 8%

Guy Wormser, MDI BABAR France 20 Nov 2003 Characterisation of injection aborts z166 such aborts between January and Oct12 (72 Jan- April,60 May-June, 34 Sept- Oct) z3 types: yType 1A: isolated events yType 1B : spike during an injection pattern yType 2: long radiation build up zStored beams can cause all types zInjection bunch can cause type 1B and 1A if the abort occurs on the first injected bunch 1A1A 1B1B 2

Guy Wormser, MDI BABAR France 20 Nov 2003 Injection 1A spike width Stable beams Injection

Guy Wormser, MDI BABAR France 20 Nov 2003 Time distribution between rad spike and injection clock (type 1B) Injection inhibits Injection aborts Grid resolution effects 30 Hz transition?? Evidence for a contribution from injected bunch and a flat component

Guy Wormser, MDI BABAR France 20 Nov 2003 Une étude des effets de la transition de bunch pattern zTransition effectuée très rapidement le 30 Octobre à 9h10 zEtude facilitée par la similitude des courants avant et après la transition zImportance cruciale de bien comprendre cette configuration car cest la route vers la haute luminosité zEffets observés: sauts dans les pompes, les senseurs de température, les beam loss monitors et BABAR

Guy Wormser, MDI BABAR France 20 Nov 2003 Beam Loss Monitor 8072 recent history Injection-time data removed

Guy Wormser, MDI BABAR France 20 Nov 2003 BABAR sensors recent history IFR DCH Si Top FW Si Top FE Witold By 2 Bunch Witol d By 2 bunch

Guy Wormser, MDI BABAR France 20 Nov 2003 A look at Straight sections pumps zMany SR pumps saw also the bunch pattern change zSR2 VP % zSR4 VP % z SR4 VP % zSR4 VP % zSR4 VP % zSR10 VP % zSR10 VP % zSR10 VP % zSR10 VP % zSR12 VP % zSR12 VP % zSR12 VP % zPumps with downwards cHANGE zSR10 VP % zSR4 VP % zSR4 VP % zSR4 VP % zSR2 VP % zSR2 VP % zSR2 VP % SR4 VP3091 SR4 VP3031

Guy Wormser, MDI BABAR France 20 Nov 2003 Some examples of steps in BLM and temerature sensors LER- Pr4- bllc30 74 Q5LV3 -10 deg Q2rv deg T3018 P deg

Guy Wormser, MDI BABAR France 20 Nov 2003 Superimposed plots (2 weeks of data 20/10-4/11) PR02-VP2074 Multipacting supression in the by-2 pattern By-3 Bye-2

Guy Wormser, MDI BABAR France 20 Nov 2003 Another example in SR4 By 3 By 2

Guy Wormser, MDI BABAR France 20 Nov 2003 Upward step in SR02 VP3054 By 2 By 3

Guy Wormser, MDI BABAR France 20 Nov 2003 First observations of temperature variations in the HER (looking at bellows) Two types of effects seen up to now: strong upward move such as this one PR02 T9092BLW +40 Deg! Pattern change

Guy Wormser, MDI BABAR France 20 Nov 2003 The temperature rise is due to resonance PR