E-93026 Efficiency

GEn01 Performance

Below the plots of various performance variables vs. time. The plots for Q2=1 get their information from the runlist which is maintained by the shift crew and are updated automatically every night.

ND3 Efficiency

Plotted is the ND3 efficiency vs time. ND3 efficiency is defined as pure data taking time on polarized ND3 divided by the time that passes by. Reason for inefficiency is any kind of downtime (LCW leaks, machine, equipment, holidays ...) and other activities as target anneals, calibrations, moller runs etc. Days is the number of days passed since the scheduled start of the experiment.

Start of Q2=1 run: Oct 18, 2001 -- End run: Dec 21, 2001

Start of Q2=0.5 run: July 17, 2001 -- End run: Sep 14, 2001

Target Polarization

Plotted is the ND3 Polarization vs time. The ND3 Polarization is the charge weighted average target polarization for each day. These are online target polarizations!

Start of Q2=1 run: Oct 18, 2001 -- End run: Dec 21, 2001

Start of Q2=0.5 run: July 17, 2001 -- End run: Sep 14, 2001

Figure of Merit

Plotted is the Figure of Merit (FOM) vs time. FOM is the product of average target polarization and square root of accumulated charge.

Start of Q2=1 run: Oct 18, 2001 -- End run: Dec 21, 2001

Start of Q2=0.5 run: July 17, 2001 -- End run: Sep 14, 2001

Running Error

Plotted is the running relative error vs time. It is purely statistical and assumes GEn = Galster. Further assumptions are made on neutron rate and physics asymmetry which are not known to better than 20%. Finally all the polarizations are online values. So this is a rough estimate only.

Start of Q2=1 run: Oct 18, 2001 -- End run: Dec 21, 2001

Start of Q2=0.5 run: July 17, 2001 -- End run: Sep 14, 2001

Marko Zeier Markus.Zeier@unibas.ch