Test of Link and Control Boards with LHC

Test of Link and Control Boards with LHC like beam, CERN, May 2003 Karol Bunkowski Warsaw University RPC Trigger Electronics System Review, Warsaw, 08. 07. 2003 Karol Bunkowski, Warsaw University

Tested functionalities of Link System • Synchronization of signals from chambers • Histogram of signals in synchronization window • Histogram of all signals from chambers • Histogram “bx history” • “Snapshots” • Test pulses • TTCrx signals distribution • LB FPGAs loading from CB • CCU and VME interfaces RPC Trigger Electronics System Review, Warsaw, 08. 07. 2003

Test Pulses Sharpness of the Synchronization Window Test pulse directly connected to input channel with short (~5 cm) cable Test pulse Synchronization window widow open widow close The sharpness of the synchronization window edge is ~0. 3 ns (one channel) RPC Trigger Electronics System Review, Warsaw, 08. 07. 2003 Karol Bunkowski, Warsaw University

Test Pulses Input Channels Skew One test pulse directly connected to each input channel Found problem: big skew between input channels (~1 ns) Reason: differences in paths lengths on the PCB After fixing the paths lengths the skew should be reduced to ~0. 4 ns RPC Trigger Electronics System Review, Warsaw, 08. 07. 2003 Karol Bunkowski, Warsaw University

Beam tests Histograms The muon beam profile RPC Trigger Electronics System Review, Warsaw, 08. 07. 2003 The „bx history” histogram train of 48 bx’s with muons Karol Bunkowski, Warsaw University

Beam tests Window Size and Position Scans Ratio of chamber noise signals in synchronization window to all measured. RPC Trigger Electronics System Review, Warsaw, 08. 07. 2003 The beam bunch time shape scanned with 1 ns window Karol Bunkowski, Warsaw University

Beam tests Snapshots Bx Channel RB 1 RB 2 RPC Trigger Electronics System Review, Warsaw, 08. 07. 2003 Karol Bunkowski, Warsaw University

Beam tests Snapshots, Clusters Size Distribution RPC Trigger Electronics System Review, Warsaw, 08. 07. 2003 Karol Bunkowski, Warsaw University

Conclusions The histograms and snapshots work well and have proved their usefulness in testing the performance of chambers. TTCrx signals distribution, test pulses and FPGA loading work well. It should be possible to reduce the skew of input channels and output of test pulses by fixing the paths lengths on a LB PCB Optical link will be tested as soon as the quartz for the PLL is available Problems with CCU block transfer and I 2 C control of FEBs RPC Trigger Electronics System Review, Warsaw, 08. 07. 2003 Karol Bunkowski, Warsaw University