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LHC-BI Review Workshop Monday, 19 November 2001

LHC-BI Review Workshop Monday, 19 November 2001. Beam Synchronous Timing ( BST ). Beam Instrumentation Timing Requirements. Use of the Timing Trigger & Control (TTC) system. Main Features & Component requirements. Present Status, Planning & Issues.

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LHC-BI Review Workshop Monday, 19 November 2001

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  1. LHC-BI Review WorkshopMonday, 19 November 2001 Beam Synchronous Timing ( BST ) • Beam Instrumentation Timing Requirements • Use of the Timing Trigger & Control (TTC) system • Main Features & Component requirements • Present Status, Planning & Issues LHC-BI Review Workshop J.J. Savioz SL/BI

  2. > Transmission to all acquisition crates of:1- Machine Events & Machine Status.2- Time of day. 3- Beam Synchronous Clock: - Bunch Clock (40MHz) & Turn Clock (11KHz) With a maximum overall jitter < 1 ns.( rms)4- Beam Synchronous commands: - Injection Warnings. - Acquisition triggers. - Real time settings. - Post Mortem triggers.> Use a single distribution network.> Taking account of the different propagation delays. BI Requirements ( What do we want ? ) LHC-BI Review Workshop J.J. Savioz SL/BI

  3. Use of the Timing Trigger & Control (TTC) system TTC system Overview ( What is it ?) > LHC Common Project RD12 started several years ago in order to provide all signals necessary to synchronise the detectors : LHC 40 MHz Clock, Level 1 Trigger and arbitrary commands which are all distributed on a single fibre network to end users. L1Trigger Frame Encoder Multiplexer Broadcast Commands Addressed parameters LHC Clock LASER TREE COUPLER Recovered signals: - Delayed LHC Clock - Level 1 Trigger - Broadcast commands - Addressed parameters - Transmission status -…. optical fibre network TTCrx LHC-BI Review Workshop J.J. Savioz SL/BI

  4. Use of the TTC system ( How to provide it ? ) • Motivation: • Can we use an updated LEP BST system for LHC ? > NO • Does TTC system cover Beam Instrumentation needs ? > YES • Profit from RD12 investment. • Common system for Experiments & accelerators. • Use support facilities. • Price < 1000FS / Channel (Without fibres) > > Save time & money ! • Implementation: • New LHC Beam Synchronous Timing based on T.T.C. LHC-BI Review Workshop J.J. Savioz SL/BI

  5. Use of the TTC system ( How to provide it ? ) • TTC system provides a convenient way of distributing the 40 MHz clock and the Orbit Turn Clock from the central Prevessin Control Room (PCR) to both the LHC experiments and the beam instrumentation areas around the collider. • In addition we profit from the TTC’s ability to transmit data by inserting a so-called BST message, containing commands and parameters that can be broadcast simultaneously to all instruments. • A BST message consists of 32 consecutive broadcast commands systematically transmitted at each Orbit Turn Clock. • A new TTC receiver interface for Beam Instrumentation (TTCbi), including the TTCrx chip, is being designed to recover the two distributed clocks, decode and store all BST messages and make them available to the front-end controller. LHC-BI Review Workshop J.J. Savioz SL/BI

  6. BST Message Contents LHC-BI Review Workshop J.J. Savioz SL/BI

  7. Main Features & Component requirements Message Transmission Orbit Turn Clock 11 KHz LHC Clock 40 MHz Machine Events Beam Parameters Process Request BST MESSAGE PROCESSOR TTCVI TTC Transmitter CRATE Optical Distribution FIFO LHC-BI Review Workshop J.J. Savioz SL/BI

  8. Main Features & Component requirements Message Reception > TTCbi Front End Controller VME CPU Board VME BUS PMC PCI Hardware Signals TTC Optical Input I/O LHC-BI Review Workshop J.J. Savioz SL/BI

  9. Main Features & Component requirements TTCbi Bloc Diagram TTCrx Deskewed CLOCK L1A trigger OUT EVENT COUNT SUB ADDR DATA STATUS I2C 40 MHz Clock Local Turn Clock Coarse Delay Selected outputs Hardware output PCI Bus Interface & Control logic Message Generator Optical Input IRQ & PCI BUS Dual Ported Memory I2C Bus Interface LHC-BI Review Workshop J.J. Savioz SL/BI

  10. Main Features & Component requirements BST Systems with different parameters are required • 1 for SPS & transfer lines Bunch Clock :40 MHz = 200 MHz / 5 Turn Clock : 44 KHz = 200 MHz / 924 > THE 40 MHZ WILL VARY DURING THE ACCELERATION: from 40.053 MHz at 26 GeV to 40.079 MHz at 450 GeV. ( ~ 26 KHz) • 1 for each LHC Ring: Ring 1 & Ring 2 Injection: Bunch Clock : 40 MHz = 200 MHz / 5 Turn Clock : 11 KHz = 200 MHz / 17820 Ramping : Bunch Clock : 40 MHz = 400 MHz / 10 & Collision Turn Clock : 11 KHz = 400 MHz / 35640 > THE 40 MHZ WILL VARY DURING THE ACCELERATION : from 40.0789 MHz to 40.0790 MHz at 7 TeV for protons ( ~ 100 Hz) from 40.0783 MHz to 40.0790 MHz at 7 TeV for heavy ions (~ 700 Hz) > The 2 RF signals will not be phase locked during injection phase or MDs LHC-BI Review Workshop J.J. Savioz SL/BI

  11. Main Features & Component requirements Same structure for the 3 BST systems. Encoder & Transmitter BST MASTER TTCvi RF Signals PCR 1:32 S.M. Tree Coupler S.M. F.O Network To experiments TTC Repeater Buildings : LHC Px, SPS BAx, Lab,... M.M. F.O. Network To all Acquisition Crates Optical Att. TTCbi TTCRx LHC-BI Review Workshop J.J. Savioz SL/BI

  12. Main Features & Component requirements Including Spare parts (x) > Transmitter Crate : 5 (2) TTCvi : 5 (2) > Repeater Crate : 40 (11) TTCmx module : 100 (29) > Receiver TTCbi : 300 (55) TTCrx TTCrx : 600 (300) LHC-BI Review Workshop J.J. Savioz SL/BI

  13. Present Status, Planning & Issues • Discussion within the context of Tim W.G. • TTC Transmission tested • TTC vi / BST compatibility tested • Project approval (Tim WG) ( SLTC) (BITB) • TTC transmission installed in SPS (40 MHz + Turn Clock) • TTCbi design and test ready soon • BST master design started • Software design started • 2002 : > Commissioning of all TTC & BST system in SPS • 2003: > Everything should be operational for SPS startup for extraction • 2004: > Everything should be operational for LHC ring1 > Sector 7 - 8 • 2005: > Everything should be operational for LHC ring1 & ring2 LHC-BI Review Workshop J.J. Savioz SL/BI

  14. Present Status, Planning & Issues > ATLAS and CMS have asked TTCbi modules. > EP Pool will support the TTCbi as the other TTC components. > Good example of collaboration between SL and EP divisions. > Open question : Who will operate the TTC system ? LHC-BI Review Workshop J.J. Savioz SL/BI

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