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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. - PowerPoint PPT Presentation
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19 November 2001 LHC-BI Review Workshop J.J. Savioz SL/BI
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LHC-BI Review WorkshopMonday, 19 November 2001
• Beam Instrumentation Timing Requirements
• Main Features & Component requirements
• Use of the Timing Trigger & Control (TTC) system
• Present Status, Planning & Issues
Beam Synchronous Timing ( BST )
19 November 2001 LHC-BI Review Workshop J.J. Savioz SL/BI
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> 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 ? )
19 November 2001 LHC-BI Review Workshop J.J. Savioz SL/BI
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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.
• Use of the Timing Trigger & Control (TTC) system
FrameEncoder
Multiplexer
L1Trigger
LHC ClockBroadcast CommandsAddressed parameters
LASER
TREE COUPLER
TTCrx
optical fibre network
Recovered signals:- Delayed LHC Clock- Level 1 Trigger- Broadcast commands- Addressed parameters- Transmission status-….
19 November 2001 LHC-BI Review Workshop J.J. Savioz SL/BI
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• 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.
• Use of the TTC system ( How to provide it ? )
19 November 2001 LHC-BI Review Workshop J.J. Savioz SL/BI
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• 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.
• Use of the TTC system ( How to provide it ? )
19 November 2001 LHC-BI Review Workshop J.J. Savioz SL/BI
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Bytes Description Data format Updated every
0 Machine Mode Enumerated type: No beam, filling, ramping, physic,… On change
1 Beam Type Enumerated type: Ion, Proton,… On change
2 Beam Energy 2 bytes in GEV On change
3 Beam Energy
4 Mean Current per Bunch 2 Bytes * 10E11 ppp
5 Mean Current per Bunch
6 Number of injected Bunches 2 Bytes integer On change
7 Number of injected Bunches
8 Next Batch to Inject 0 for no beam or 1 .. 12 On change
9 GPS Absolute Time 64 bits UTC format On change
10 GPS Absolute Time
11 GPS Absolute Time
12 GPS Absolute Time
13 GPS Absolute Time
14 GPS Absolute Time
15 GPS Absolute Time
16 GPS Absolute Time
17 Last Machine Timing Event 2 Bytes : Machine Timing Event number On reception
18 Last Machine Timing Event
19 BI Predefined received Events 2 bytes : corresponding to 16 predefined events table On reception
20 BI Predefined received Events
21 Main Trigger Byte 8 X 1 bit dedicated Trigger: warning injection, start post-mortem, … 1 Turn
22 BI devices dedicated Bytes 10 Bytes device dedicated commands or triggers : 1 Turn
23 BI devices dedicated Bytes Closed orbit capture, Single Turn trajectory measurement,….
24 BI devices dedicated Bytes
25 BI devices dedicated Bytes
26 BI devices dedicated Bytes
27 BI devices dedicated Bytes
28 BI devices dedicated Bytes
29 BI devices dedicated Bytes
30 BI devices dedicated Bytes
31 BI devices dedicated Bytes
BST Message Contents
19 November 2001 LHC-BI Review Workshop J.J. Savioz SL/BI
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Message Transmission
BST
MESSAGE
PROCESSOR
TTCVI
FIFO
TTC
TransmitterCRATE
LHC Clock40 MHz
Orbit Turn Clock 11 KHz
MachineEvents
BeamParameters
ProcessRequest
OpticalDistribution
• Main Features & Component requirements
19 November 2001 LHC-BI Review Workshop J.J. Savioz SL/BI
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Message Reception > TTCbi
VME BUS
HardwareSignalsTTC
OpticalInput
PMCPCI
I/O
Front End Controller VME
CPU Board
• Main Features & Component requirements
19 November 2001 LHC-BI Review Workshop J.J. Savioz SL/BI
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TTCbi Bloc Diagram
TTCrx
DeskewedCLOCK
L1A trigger OUT
EVENT COUNT
SUB ADDR
DATA
STATUS
I2C
OpticalInput
I2C BusInterface
40 MHzClock
Dual Ported
Memory
PCIBus
Interface
&
Controllogic
&
Hardware output
IRQ
PCIBUS
Coarse Delay LocalTurn Clock
Selected outputs
Message Generator
• Main Features & Component requirements
19 November 2001 LHC-BI Review Workshop J.J. Savioz SL/BI
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• 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
19 November 2001 LHC-BI Review Workshop J.J. Savioz SL/BI
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• Main Features & Component requirements
Encoder&
Transmitter
1:32 S.M. Tree Coupler
TTC Repeater
To experiments
TTCvi
TTCRx
To all Acquisition Crates
BSTMASTER
S.M.F.O
Network
TTCbi
M.M. F.O.Network
Buildings :LHC Px,SPS BAx, Lab,...
PCR
Optical Att.
Same structure for the 3 BST systems.
RF Signals
19 November 2001 LHC-BI Review Workshop J.J. Savioz SL/BI
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• Main Features & Component requirements
> Transmitter Crate : 5 (2)
> Repeater Crate : 40 (11)
TTCmx module : 100 (29)
TTCvi : 5 (2)
Including Spare parts (x)
> Receiver TTCbi : 300 (55)
TTCrx : 600 (300)TTCrx
19 November 2001 LHC-BI Review Workshop J.J. Savioz SL/BI
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• 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
• Present Status, Planning & Issues
19 November 2001 LHC-BI Review Workshop J.J. Savioz SL/BI
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> 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 ?
• Present Status, Planning & Issues