| TOF PID/Crosstalk/Noise |
| TOF PID Comparisons: PR01 and PR03 | |
| PID for PR03: changes in processing T0 information. | |
| Options to reduce cross talk | |
| Final remark: moving the T0 counters |
| TOF PID for PR01 |
| Road to PID in PR03 |
| The PID limit achieved in PR01 is 2.25 GeV/c for protons. | |
| The resolution in PR03 is dominated by the T0 correlations (which limits the accuracy with which the collision time can be determined). | |
| Switching from using individual T0s to determine the collision time to using the ORs is non-trivial (e.g. all our automatic monitoring monitors individual T0/TOF channels, not trigger bits). |
| Road to PID in PR03 |
| Modifications to DV are in progress, which will allow us to monitor the T0 OR stability at an increased resolution. | |
| Implementation of the collision time based on the T0 OR is the first priority. | |
| Improving the T0 OR resolution, by using the measured hit distribution and/or using the T0 OR information recorded with the VME TDC, is second priority. | |
| Trying to implement a multi-dimensional calibration matrix is last on the priority list. | |
| Road to PID in PR03 |
| Tasks: | ||
| TOF DST production: Erik | ||
| T0 collision time based on OR: Frank | ||
| T0 collision time optimization: Nazim | ||
| TOF tracking/ntuple production: Erik | ||
| Modifications to DV: Frank | ||
| Issues to be addressed: | ||
| Understanding difference between TOF residual from Rochester analysis and other analyses (important implications for Au+Au). | ||
| Replace T0 cables in order to eliminate cross talk. | ||
| Study of pedestal noise in the trigger/TOF/T0 counters. | ||
| Cable options
considered (single twinax cables) |
| Cheminax: | ||
| Model 0022E0311 | ||
| Conductor # 22 | ||
| Attenuation = 20 dB/100Õ (@ 400 MHz) | ||
| Capacitance: 13.5 pF/ft | ||
| Cost: $ 1,700.00/1000Õ | ||
| Belden: | ||
| Model 7837A (Paired T1 cable) | ||
| Conductor # 22 | ||
| Attenuation = 4.3 dB/100Õ (@ 0.77 MHz) | ||
| Capacitance: 14.5 pF/ft | ||
| Cost: $ 146.90/1000Õ | ||
| Belden: | ||
| Model 7837A (Paired T1 cable) | ||
| Conductor # 20 | ||
| Attenuation = 10.2 dB/100Õ (@ 400 MHz) | ||
| Capacitance: 14.5 pF/ft | ||
| Cost: $ 242.82/1000Õ | ||
| Thermax: | ||
| Model E100-1934(2)AMAXE | ||
| Conductor # 22 | ||
| Attenuation = 12 dB/100Õ (@ 400 MHz) | ||
| Capacitance: ?? pF/ft | ||
| Cost: $ 2,223.00/1000Õ | ||
| Final remark |
| At the end of the pp run, the T0 counters will need to be removed to allow the installation of the beam-pipe protection system. | |
| Nazim and Erik signed up for shifts at the end of the p+p run and will remove the T0 counters as soon as there is access at the end of the p+p run. | |
| We propose to reinstall the T0 counters behind ring 3 on both P and N sides (which is their appropriate location for the Au+Au run). |