Characterization of Wired-OR prototype board Alberto Aloisio – Gianpaolo Carlino – Givi Sekhniaidze 200 Wired-OR boards have been produced to be used in integration test in Frascati and cabling test at CERN. Prototype tested with unshielded 16 pole flat cable. Bench test results Comparison of pulse shapes on RPC Statistical analysis on Cosmic Ray data 17 July 2002 Lecce - RPC meeting

Fast-Or board TDR analysis TDR test results: Z0 = 107 Ohm Lmin = 290ps Lmax = 320ps Line-to-line max skew is 30ps Connectors’ through holes 17 July 2002 Lecce - RPC meeting

Test setup 17 July 2002 Lecce - RPC meeting

Bench test results Input pulses in the 5 to 25 ns range (ch.1) Output pulse on the 100 Ohm load (ch.2) 17 July 2002 Lecce - RPC meeting

RPC signals without and with OR Selected pulses are acquired with a digitizing scope Scope is triggered by cosmic rays Signals from BML-D chamber equipped with final front-end boards with stretching capacitor Direct pulse Wired-OR 17 July 2002 Lecce - RPC meeting

Direct comparison Typical RPC pulses with and without OR are superimposed OR loading and multiple-reflection pattern sharpen the pulses Width and amplitude are both preserved Only few pulses acquired Statistical analysis is required to evaluate the impact on detector performances Direct pulse Wired OR 17 July 2002 Lecce - RPC meeting

Statistical analysis on Cosmic Ray events (8 strip pairs) Direct pulse Wired OR Leading edge Trailing edge Width Efficiency measured in both cases are the same VTH = -1.0 V, HV = 10400 V, e ~ 97% 17 July 2002 Lecce - RPC meeting