First Iteration of TOF Calibration Procedure for E1F

4/29/07

The calibration procedure was implemented on E1F run# 37688. Calibration constants were uploaded to the database with RunIndexGohn for TDC corrections, Geometric Means, Attenuation Lengths, RF Offsets, and Paddle to Paddle Corrections. Corrections for Effective Velocity and Coupled Paddle have not yet been done, but they should be for the next iteration. Some plots from the calibration follow.

The following plot shows the RF Offset, which is given by the mean of the Gaussian fit to this distribution, giving a value of 0.001782 ns. We also see an improvement in the sigma value from the previous pass0, which had typical values of sigma above 0.18.

The TDC corrections showed a non-linear nature, leading us to believe that e1f used the old fastbus TDC's instead of the new Pipeline TDC's. This can be seen from the second plot showing delta_Tu. Can anyone verify that this is correct?