Initial rough Background comparisons between Run5 and Run 4 Guy Wormser LAL Orsay.

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Presentation transcript:

Initial rough Background comparisons between Run5 and Run 4 Guy Wormser LAL Orsay

Samples Run5 : April 17 0h00 to April 19, 8h00 unless specified otherwise –First good shifts (100 pb-1) –L>3 10**33 –Mostly 4 packet bunch spacing Run 4 random choice July 17/July 19 : typical high lumi smooth running

Sample characteristics Black LER Red HER Green Lumi Run 5 April 17/19Run 4 July 17/19

Pumps reponse LER VP2045 Red 2005 Black 2004 LER current nTorr Factor still 1.5 to go

More LER IR2 Pumps VP2074 VP2144 VP2097 VP2176

More LER pumps VP3054 VP3115 VP3131 VP3075

More LER pumps

HER pumps

Background in BABAR subdetectors DCH DRC Vs HER DCH Vs LUMI DRC Vs LUMI Vs LER

Forward neutron

SVTMid FW TRG

Last minute update up to April 22 0h00 2 bunch spacing VP2045 VP2074

Conclusions HER vacuum almost similar to Run4 LER vacuum situation is contrasted from pump to pump. DCH, DRC background levels similar to Run4 although currents and lumi are lower SVT background somewhat higher than Run4 Neutron background scales as in Run4