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Real time performance estimates of the LHC BPM and BLM system

Real time performance estimates of the LHC BPM and BLM system. SL/BI. Contents. BLM/BPM System Layout. BLM/BPM Functionality Requested. BLM/BPM Real Time Behavior. First Conclusions. Open Issues. The Beam Position Monitors (BPM) (cf. LHC BI Conceptual Design Report).

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Real time performance estimates of the LHC BPM and BLM system

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  1. Real time performance estimates of the LHC BPM and BLM system SL/BI

  2. Contents • BLM/BPM System Layout. • BLM/BPM Functionality Requested. • BLM/BPM Real Time Behavior. • First Conclusions. • Open Issues. SLTC

  3. The Beam Position Monitors (BPM)(cf. LHC BI Conceptual Design Report) • For eachtransfer line26 H and 27 V 106 monitors. • For themain ringsabout 1000 monitors(H & V). • The specifications for the rings and transfer lines beam position systems are very similar a common approach for the readout electronics and for the calibration system is planned. TI8 BPMs and CO Infrastructure (Timing, Network, Middleware…) have to be ready in TI8 for February 2004 injection test.  A prototype digital acquisition board (DAB) is in development at TRIUMF (part of Canadian contribution to LHC funded until May 2000). It will be delivered and tested in the SPS (BA4) this summer. SLTC

  4. The Beam Loss Monitors (BLM) (cf. LHC BI Conceptual Design Report) • The beam halos will be cleaned by means of multiple collimators in the two insertions at IP3 and IP7. The dedicated BLMs will NOT be housed in the BPM crates. • The tertiary halo which will escape from the cleaning insertions will be concentrated around the quadrupoles. 3000 BLMs will be located close to the quadrupoles and housed in the BPM crates. • All BLMs will be permanently surveyed in order to dump the beam to prevent magnet quenches. SLTC

  5. ? 1 Mbits/s WorldFIP segments (each handling up to 6 crates) are considered for transmitting the RT data-flow via the ATM gateways to the PCR. ? BPM/BLM System Layout (1/2) BPM ~ 500 PUs (H and V) distributed around each ring. Housed in 250 crates around tunnel4 PUs per cratewith their 40 MHz processing electronics (analogue and digital). BLM 6 detectors per QD/QF quadrupole pair ( 3 detecting losses from each ring) Those share the 250 BPM crates 12 detectors per cratewith theirelectronics measuring loss rates individually for each of the 12 batches. To ensure enough bandwidth to readout non RT data-sets (multi-turn data, post mortem data, etc.), a standard 10 Mbit/s Ethernet connection for each station via ATM gateways to the PCR has been proposed. SLTC

  6. BST Master (? TTC ?) Ctrl Station(PPC) Remote Console Local BST Drivers Remote Reboot R.Reboot R.Console R.Reboot R.Console PCR WorkStation/PPC (HPUX, LinuX, NT…) BI WorldFIP Master * 2 BLM/BPM Crate ... BLM/BPM Crate Network Switch (GigaEth) Network Switch (ATM) Network Switch (10 Mbits/s) <= Up to 850 m. => PCR US/UJ/RE (* 24) Ring (* 250) -> Up to 6 crates per Wfip Bus, 4 BPMs & 16 BLMs per crate BLM/BPM System Layout (2/2) Ethernet: General purpose (Mass data retrieval, setting...). ATM : RT communications between PCR and US/UJ/RE. WorldFIP: - 10Hz RT Orbit Correction (Front End->US/UJ). - Beam Loss Monitoring(Front End->US/UJ). BST: - 11kHz. Turn clock (Main Signal) - All Synchronization signals. (fast timing 40 MHz) - All Synchronous commands. SLTC

  7. BI Crate Layout (if VME is chosen) SLTC

  8. BLM/BPM VME Crate (if VME is chosen) SLTC

  9. For thepost mortem (frozen by beam dump), the circular storage in the DAB of about the last second of orbit data is currently considered. ? ? Beam Orbit Measurement Functionality For theglobal orbit feedbackwith closed loop bandwidth of 1 Hz a readout of average orbit data at 10 Hz is foreseen. For the other applications (1000 turns, Optic Measurements…) it will be possible to trigger on request the acquisition of N consecutive turns of any M bunches, where N x M may not exceed 64000. SLTC

  10. If data has to be concentrated to apply beam abort algorithm, we will need to transmit to PCR at least beam average rates at 100 Hz. ? ? Forthepost mortem (frozen by beam dump), we could maintain locally parallel circular buffers at 100 Hz and 1 Hz (e.g. could have last 256 s every 1 s and 2.56 s every 10 ms for each detector and batch). ? ? Beam Loss Monitors Functionality To prevent magnet quenches, the BLM electronics will measure loss rates individually for each of the 12 batches integrated over 10 ms  100 Hz measurement rate. SLTC

  11. SLTC

  12. First Conclusions • Every single piece of the puzzle is feasible, BUT we must keep in mind that the assembly, tuning and commissioning of the entire system will be a verydifficult task that will need time, collaboration, competence and experience. • We need the TI8 BPM system to be ready for February 2004. Due to this, we have to define and chose the HW (VME, Wfip 2.5Mb/s, ATM, Optic Fiber ,…) and SW (PPC, LynxOS, ...) development platform this summer and stick to it. • We need answers to the open issues in the coming months. ... SLTC

  13. Why So Early • Radiation qualification problems may induce long delays. • People availability. • We will have to deal with a very complicated system. SLTC

  14. Open Issues • LHC Front End Platform... • Beam Dump… (When, How…) • Post Mortem… (When, What...) • BLM/BPM acquisition RT transmission… • Optic Fiber in the Tunnel... • BST … (What, How…) • BLM/BPM/WorldFIP/ATM synchronization… • Absolute time stamp... SLTC

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