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Collisions Rates and Background Signals: MLK Weekend and RHIC Vacuum Problem

This data report analyzes the collisions rates and background signals during the MLK weekend in 2010, as well as the issues related to rebucketing and stochastic cooling in Yellow. It also highlights the impact of varying conditions on shift crew efficiencies and the need for more stores with moderate cooling.

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Collisions Rates and Background Signals: MLK Weekend and RHIC Vacuum Problem

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  1. Collisions rates, and few background signals, 1/15 -1/18, 2010 (MLK wkend) BBC coincidence rate Yellow Beam background Blue Beam background ZDC coincidence rate No rebucketing and no stochastic cooling. STAR tuned for optimum data taking efficiency. Shift crews work on efficient data taking.

  2. Collisions rates, and few background signals, 1/22 -1/25, 2010 Rebucketing with new lattice RHIC Vacuum problem BBC coincidence rate Yellow Beam background Blue Beam background ZDC coincidence rate With rebucketing and stochastic cooling in Yellow.

  3. Collisions rates, and few background signals, 1/25, 2010 Star requests more stores like this (Moderate cooling?) Monday morning store Monday afternoon store BBC coincidence rate Yellow Beam background Blue Beam background ZDC coincidence rate The large backgrounds lead STAR to decrease the rate that we take events by up to ~ 40%. The varying conditions lead to Shift crew inefficiencies as they work to adapt to dynamic conditions.

  4. Collisions rates, and few background signals, 1/25, 2010 Star requests more stores like this (Moderate cooling?) BBC coincidence rate Yellow Beam background Blue Beam background ZDC coincidence rate • The large backgrounds lead STAR to decrease the rate that we take events by up to ~ 40%. • The varying conditions lead to Shift crew inefficiencies as they work to adapt to dynamic conditions.

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