j. varela, lip-lisbon/cern leade wg meeting cern, 29 march 2004 requirements of cms on the bst j....

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


Trigger Fast Control

Global Trigger Global Trigger TTCmiTTCmi DAQ Event Managers

DAQ Event Managers

Partition ControlPartition Control

TTCrxTTCrx

FrontEnd


TTCrxTTCrx

FrontEnd


TTCTTC sTTSsTTS TTCTTC sTTSsTTS TTCTTC sTTSsTTS

TTCrxTTCrx

FrontEnd

Central Control aTTSaTTSLHC-BST

GPS

LHC-BST GPS

Local Control

Local Control

Local Control

Local Control

Local Control

Local Control

Local Triggers

BST


GLOBAL TRIGGER CRATE

CPU

int

TTCci

TTCex

TTCTTS

From/To SUBDETECTOR FRONTEND CRATES

TTS Link

TTC Link

Local Triggers

LTC TTC

TTS

... ...

Fast Merging Module

Local Trigger Controller

SYNC TTS

FMM

Central Trigger Control

(x 32) (x 32)

TTCmi

To EVM

To/from aTTS

ClockOrbit

Trigger Control Components

Subdetector Master TTC Crate

BST link

FMM

FMM

BST link


TTCci Module

Interface to TTC optical distributionReplaces 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 byTony Rohlev (Wisconsin/CERN)


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 bitsTechnical trigger bits 32 bitsAlgo 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


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 correlateEvent Data withDetector Control Data


Interface to LHC BSTLHC 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)


Bytes Description Data format Updated every

0 Machine Mode Enumerated type: No beam, filling, ramping, physic,É On change

1 Beam Type Enumerated type: Ion, Proton,É 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







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, É 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,É.

24 BI devices dedicated Bytes








time granularity of 1ms

time granularity of 1turn

BST Message Contents


BST

MESSAGE

ASSEMBLER

TTCEncoder

&Optical

Transmit.

Bunch & Turn Clocks

TTC Optical Network

Universal time

MachineEvents (?)

BeamParameters

Real-timecommands

Hardware triggers

BOBR

TTCrx BSTMESSAGERECEIVER

Clocks

Data

Bytes

CTCTTCrx

LTCTTCrx

10

1

1

BST Overview

CMS specific BST itemsshould be located in racks S1 E 8-10 (LHC, BPTX, BPM)

Located in Central Trigger and TTC racks (S1 E 2-4)


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)

j. varela, lip-lisbon/cern leade wg meeting cern, 29 march 2004 requirements of cms on the bst j....

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