1. 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

2. 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

3. Test setup
17 July 2002
Lecce - RPC meeting

4. 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

5. 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

6. 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

7. 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 = V, e ~ 97%
17 July 2002
Lecce - RPC meeting