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Real time. 4 meetings so far. Consensus: Real-time will be required to operate the LHC. The demands on speed appear to be reasonable, and data acquisition, or measure & correct appear to be necessary at a maximum of 10 Hz. Bandwidth requirements are also moderate.

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Real time
Real time

  • 4 meetings so far.

    • Consensus: Real-time will be required to operate the LHC.

  • The demands on speed appear to be reasonable, and data acquisition, or measure & correct appear to be necessary at a maximum of 10 Hz. Bandwidth requirements are also moderate.

  • Aim to provide a global real-time framework to support the multiple input, multiple output requirements foreseen.


Rt requirements ii
RT requirements II

Response limited by PC/magnet


Latencies
Latencies

Which should allow 10 Hz


Control assumptions
Control: assumptions

  • Snap-back and low energy provide the challenge

  • Nominal is the worse case...

  • The “multipole factory” takes care of at least 80% of the effect i.e.

    • magnetic measurements

    • non-linear models

    • on-line reference magnets

  • Characteristic frequency of snap-back slow & not changed by feed-forward from “multipole factory”

  • Corrections to:

  • horiz. orbit correctors (b1) & tuning quads. (b2)

    • sextupole (b3) and decapole (b5) spool pieces

70 s

Characteristic frequency is low


Reference magnets
Reference magnets

SM18 Magnet

Test Benches

WorldFIP

fieldbus

Instrumented Magnet

C

Power

Converter

FB

I

MCCS

Gateway

Multipoles

Factory

DB

3-10Hz

Real-time LHC controls network

Real-Time

LHC Control

System


Power converters
Power Converters

  • Major system - all magnets - set, ramp, trim etc. etc. Offering RT control at 100 Hz (whether you need it or not!)

  • Digital controllers:- CERN design, manufactured by industry. Prototypes for String II.

  • Gateways:- standard SL-CO - Power PC running LynxOS

  • Fieldbus: WorldFIP from CEGELEC

  • Timing: via an IRIG-B receiver card

MCCS Server

RT LHC Network

Gateway

Gateway

Gateway

Gateway

~80 Gateways

Up to 30 Digital Controllers Per WorldFIP fieldbus

~1700 Digital Controllers


Real time1
Real time

Beam Instrumentation and Power Converter systems are

planning on providing

real-time acquisition and correction from the front-ends

to at least the gateway level.

Ethernet by appears to be capable of providing

the necessary level of performance via dedicated Gigabit Ethernet

A real-time environment will be necessary at the high-level.

A logical architecture is required to allow the implementation

of a well-designed, integrated system

A generic approach will be adopted to provide standard facilities.