1. J. Varela, LIP-Lisbon/CERN LEADE WG Meeting CERN, 29 March 2004 Requirements of CMS on the BST J. Varela LIP Lisbon / CERN LHC Experiment Accelerator Data Exchange Working Group 1. Trigger Fast Control 2. Detector Control System 3. Requirements on BST

2. J. Varela, LIP-Lisbon/CERN LEADE WG Meeting CERN, 29 March 2004 Trigger Fast Control Global Trigger TTCmi DAQ Event Managers Partition Control TTCrx FrontEnd Partition Control TTCrx FrontEnd Partition Control TTC sTTS TTC sTTS TTC sTTS TTCrx FrontEnd Central Control aTTS LHC-BST GPS Local Control Local Triggers BST

3. J. Varela, LIP-Lisbon/CERN LEADE WG Meeting CERN, 29 March 2004 GLOBAL TRIGGER CRATE C P U int T T C ci T T C ex TTC TTS From/To SUBDETECTOR FRONTEND CRATES TTS Link TTC Link Local Triggers LTCLTC TTC TTS... Fast Merging Module Local Trigger Controller SYNC TTS FMM Central Trigger Control (x 32) TTCmi To EVM To/from aTTS Clock Orbit Trigger Control Components Subdetector Master TTC Crate BST link FMMFMM FMMFMM

4. J. Varela, LIP-Lisbon/CERN LEADE WG Meeting CERN, 29 March 2004 TTCci Module Interface to TTC optical distribution Replaces TTCvi TTCci Functions:  Selecting Central or Local control  Internal storage of B commands  Timing of B commands  Internal Trigger generation  L1A and B-data transmission Development by Tony Rohlev (Wisconsin/CERN)

5. J. Varela, LIP-Lisbon/CERN LEADE WG Meeting CERN, 29 March 2004 Trigger Record to EVM: (Included in Event Record) Begin of event 64 bits //Trigg type, Eventnr, BCnr, SourceID.. Trigger number 24 of 32 //Nr of all L1A hex= „00NN NNNN“ DAQ#+ TriggType + BCnr 20 bits of 32 // 4+4+12 bits, hex=„00DT 0BBB“ Subdetector partitions 32 bits // 1= partition is connected, 0= not connected Event Number 24 bits of 32 // hex= „00NN NNNN“ Orbit number 32 bits Technical trigger bits 32 bits Algo bits_0 32 bits Physics trigger algorithm bits 0...31 Algo bits_1 32 bits Physics trigger algorithm bits 32...63 Algo bits_2 32 bits Physics trigger algorithm bits 64...95 Algo bits_3 32 bits Physics trigger algorithm bits 96...127 Algo bits_4 32 bits reserved for optional upgrade Algo bits_5 32 bits reserved for optional upgrade GPS time_0 32 bits // bytes 0-3 GPS time_1 32 bits // bytes 4-7 End of Event 64 bits //Event length, CRC.. (as for DAQ) Trigger Interface to DAQ

6. J. Varela, LIP-Lisbon/CERN LEADE WG Meeting CERN, 29 March 2004 Detector Control System Detector subsystems -HV/LV -Fluids and environment -Cooling -Racks/Crates -Temperatures -Infrastructures -Test systems (Laser, LED, alignment camera etc..) Detector safety (DSS) -Temperature -Gas -Radiation Experiment supervision -DCS Resources handling -Alarm and loggings -History data base -External systems communication. GPS Time allows to correlate Event Data with Detector Control Data

7. J. Varela, LIP-Lisbon/CERN LEADE WG Meeting CERN, 29 March 2004 Interface to LHC BST LHC Beam Synchronous Timing System (BST) > BST used to synchronize LHC beam instrumentation > Distribution of BST messages (once per orbit) uses TTC > BST message: 32 bytes, of which 8 bytes for GPS Time Usage in CMS: GPS Time added to Event Record: BST/TTC link to Central Trigger Control (1 link) BST/TTC link to Local Trigger Controllers (10 links) GPS Time and LHC Data added to DCS Data: BST/TTC link to central VME receiver (BOBR) (complementary to access to LHC data via DIP)

8. J. Varela, LIP-Lisbon/CERN LEADE WG Meeting CERN, 29 March 2004 time granularity of 1ms time granularity of 1turn BST Message Contents

9. J. Varela, LIP-Lisbon/CERN LEADE WG Meeting CERN, 29 March 2004 BST MESSAGE ASSEMBLER TTC Encoder & Optical Transmit. Bunch & Turn Clocks TTC Optical Network Universal time Machine Events (?) Beam Parameters Real-time commands Hardware triggers BOBR TTCrx BST MESSAGE RECEIVER Clocks Data Bytes CTC TTCrx LTC TTCrx 10 1 1 BST Overview CMS specific BST items should be located in racks S1 E 8-10 (LHC, BPTX, BPM) Located in Central Trigger and TTC racks (S1 E 2-4)

10. J. Varela, LIP-Lisbon/CERN LEADE WG Meeting CERN, 29 March 2004 Summary of Requirements to BST Distribution of BST messages to the experiment Final specification of BST message content and format Specification of BST/TTC message protocol and timing Update of GPS time once per 10 orbits (or better) CMS specific BST items should be located in racks LHC, BPTX or BPM (S1 E 8-10)