For the 1999 e1 run period:

-30 days x 24 hours/day x 0.4 beam/CLAS availability = 288 hours of `good' beam.

-Number of Lambdas (with e', K+, p detected) = 16992 Lambdas @ 5 nA average beam.

-DAQ dead time is already accounted for in the integrated number of particles.

-Reconstruction efficiency is already accounted for in the integrated number of particles.

-Kaon decay factor is already accounted for in the integrated number of particles.

-Expected DAQ speed improvements and second level trigger efficiency improvements (x2).

Thus we can expect 33984 Lambdas and 17367 Sigmas over ALL photon energies.

We cannot expect too much above this level due to the luminosity limitations in Hall B of 1x10^34 cm^-2/sec^-1.

What are data rates at 2.4 GeV?

Study data from the e1 running period with a beam energy of 2.4 GeV and B=1500 A acquire in early 1998.

2.4 GeV Missing Mass Reconstructions (with and without background subtracted)

The Lambda and Sigma peaks have been fitted with Gaussians and these fits have been integrated to come up with the number of counts. This count rate has been divided by the average beam current of the runs studied as well as by the duration of time the run was gated on. This time interval is between the run start and run stop not including any pauses in the run. The count rate is for our final state of interest (e',K+,p).

The integrated number of Lambdas = 32.1 /nA/hr

The integrated number of Sigmas = 12.9 /nA/hr

Last modified: January 18, 1999
Daniel S. Carman