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Test page……………………………………………………………………………....Test page. TEST PAGE. Test page……………………………………………………………………………....Test page. Assessing the safety of the beam energy tracking system (BETS). David Jones david.huw.jones@cern.ch.

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slide1

Test page……………………………………………………………………………....Test page

TEST PAGE

Test page……………………………………………………………………………....Test page

assessing the safety of the beam energy tracking system bets

Assessing the safety of the beam energy tracking system (BETS)

David Jones

david.huw.jones@cern.ch

slide4

What may happen if something goes wrong

Hole in Copper

450GeV p+ beam

Verena Kain

slide6

Sub-System

function

Sub-System

function

Sub-System

function

Sub-System

function

Sub-System

function

Sub-System

function

Sub-System

function

Sub-System

function

Sub-System

function

Sub-System

function

Sub-System

function

Assessing safety

Function description of system – Correct operation

Function description of subsystems

System function

System function

Sub-System

function

Sub-System

function

slide9

X3

X1

X0

X2

Assessing the safety of BETS

AVAILABLE

FAILED SAFE

X3

X1

X0

X2

Internal Dump Request

Common-mode failure across all of

Common-mode failure across all of

the BEM surveillance mechanisms

the BEA cards, resulting in an

on both cards

undetected failure

- watchdog timer, CRC check etc

X4

X2

X1

X3

AVAILABLE

FAILED SILENT

No Surveillance

Common-mode failure of part of the

BEM functionality, on both cards

slide10

Conclusions

    • The BETS system is a safety critical component of the LHC
    • Progress is being made towards assessing how safe it is