on behalf of Barrel RPC Collaboration RPC Technical Trigger Flavio Loddo I.N.F.N. Bari on behalf of Barrel RPC Collaboration CMS Week 14-16 March 2005 F. Loddo INFN-Bari

CMS Week 14-16 March 2005 F. Loddo INFN-Bari RPC Technical Trigger Phase I: Sector Trigger for testing RPC (and DT) during Commissioning RBC (RPC Balcony Collector) RPC Cosmic trigger Phase II: Technical trigger to be used during off-beam periods for RPC (and other detectors) calibration RBC + TTU (Technical Trigger Unit) CMS Week 14-16 March 2005 F. Loddo INFN-Bari

Block Diagram of RPC DAQ CMS Week 14-16 March 2005 F. Loddo INFN-Bari

RPC LBBox In Barrel LBBox it is unused It can provide the OR of 96 strips (half RPC) CMS Week 14-16 March 2005 F. Loddo INFN-Bari

Phase I: RBC (RPC Balcony Collector) Main Features Generic Barrel Sector Receive 2x13 (or 15) ORs from LB (LVDS) (OR of 96 strips (1 bi-gap = half RPC)) Produce Sector Trigger Mask noisy/dead Ors Force selected ORs to be in the coincidence to increase trigger selectivity Majority level selectable between 1 and 6 I2C Interface Re-Transmit input OR electrically (LVDS) to TDC Transmit input OR optically to Counting Room (GOL) RB4 RB3 RB2_OUT RB2_IN RB1_OUT RB1_IN CMS Week 14-16 March 2005 F. Loddo INFN-Bari

CMS Week 14-16 March 2005 F. Loddo INFN-Bari RBC Block Diagram CMOS-LVDS Driver FPGA (Spartan IIE) to TDC LVDS-CMOS converter 13 (15) ORs Programmable Majority Logic From 2 LBBoxes Trigger 1 (2 sectors) 13 (15) ORs Trigger 2 Controller GOL Reconf HFE4383 ( Reconfigure FPGA every ~ 5 mins to recover eventual SEU loss of configuration) to Optical PP QPLL Deskewed HF clock I2C (from CB) 1 RBC per 2 sectors 6 RBC/Wheel 30 RBC/Barrel 40 MHz LHC Clock (from LB) CMS Week 14-16 March 2005 F. Loddo INFN-Bari

CMS Week 14-16 March 2005 F. Loddo INFN-Bari RBC Status FPGA design is under development. What was done: I2C Interface Masking and Forcing feature Trigger generation (but I’m waiting for further input/suggestions from Users) Still to do: GOL management Board design ……………. ……………. Open issues: Board location Fibers routing and patch panels INFN Financial approval ……. CMS Week 14-16 March 2005 F. Loddo INFN-Bari

Phase !!: RPC Technical Trigger Implementation USC area UXC area TTU VME Crate LBBox RBC LBBox RBC 1 RBC/ 2 sectors Fiber Receiving panel Barrel Wheel 10 Optical Ribbons 1 Optical Ribbon/Half wheel CMS Week 14-16 March 2005 F. Loddo INFN-Bari

TTU (Technical Trigger Unit) Block Diagram (Preliminary) Receive optical link from RBCs Combine ORs from 1 Wheel (or from Half Wheel) …………………….. Programmable Majority Unit TLK2501 TLK2501 Trigger TLK2501 TLK2501 6x16 bit data TLK2501 HFBR782 6x16 bit data 6 Fibers Deskewed HF clock VME Interface QPLL TTCrx Comm. line LHC Clock CMS Week 14-16 March 2005 F. Loddo INFN-Bari

CMS Week 14-16 March 2005 F. Loddo INFN-Bari Cost Estimation RBC: QPLL+GOL+VCSEL ~ 100,00 € FPGA ~ 100,00 € PCB ~ 300,00 € Various ~ 100,00 € NRE ~1000,00 € Tot (30 RBC) ~20.000,00 € Fibers (6000 m) ~ 6000,00 € 5 TTU: ~ 15000,00 € 1 VME crate: ~ 5000,00 € 1 VME controller (V2728): ~3000,00 € CMS Week 14-16 March 2005 F. Loddo INFN-Bari