Use Cases - Cryo Services  Speaker: Klaus Barth on behalf of TE/CRG

TETRA ForumWednesday 09 March 2011 from 14:00 to

17:05 (Europe/Zurich) at CERN ( 503-1-001 - Council Chamber )

Outline• LHC Accelerator and Detector Cryogenics

Service– accelerator cryogenics operation – detector cryogenics operation

• Cryogenics services related to activities for other detectors and test facilities

• Outlook/Conclusion

LHC Cryogenic systemS. Claudet

Layout of LHC Accelerator Cryogenics

LHC Accelerator Cryogenics Subsystems

Point 8Storage

Sector 7-8 Sector 8-1

Surf

ace

Cave

rn

QSCA QSCB

QSRB

QURC

QUIC

QURA

Shaf

t

QSCC QSCC

Tunn

elQURC

QSRA

Review for Alarms handlingSC - 09Mar'11

How are alarms originated ?Global overview, 3x8 alarms only => 24 alarms sent through cern standard infra channels

4 points - 8 sectors, organised by cryo sub-system

Status of alarms per sub-system

Thousands of individual alarms grouped with possibility to mask each one depending on operation mode or status (nominal/techstop) to end up with only 24 potential alarms transmitted via Laser to Ti, and automatic call on cern GSMs via Mobicall

W: Warning - RC: Reduced Capacity - FS: Full Stop

accelerator cryogenics operation

Review for Alarms handlingSC - 09Mar'11

How do we deal with alarms ?• Normal case:

– Taking alarm in consideration, early diagnostic– Confirming to Ti that alarm is being treated– Taking action that could lead to sending people (1 or 2) on site– Once treated, confirming to Ti that operation is back to nominal

• Abnormal case: Easy thanks to shift crew 11months/year, done at few occasions– In case of network/Laser issue, visual or verbal information Cryo shift / Ti

shift as we sit next to each other in CCC …– We can always check our supervision panels with flashing alarms !!!

Not against using a new system, but happy with present situation, and very low probability to have a GSM issue during an intervention on site putting people safety in delicate situation!

LHC Detectors (CMS/ATLAS) cryogenics operation

Magnet configuration comprises: thin superconducting solenoid surrounding theinner-detector and three large superconducting toroids (one barrel and two end-caps)

High granularity liquid-argon (LAr) electromagnetic sampling calorimeters, LAr technology is also used for the hadronic calorimeters

ATLAS

External and proximity cryogenics for the ATLAS LAr calorimeters.

External and proximity cryogenics for the ATLAS magnet system

Cryogenics services related to activities for other detectors and test facilities

• North Area fixed target experiment cryogenics (EHN1/EHN2/EHN3): NA61, NA62 (LKr calorimeter), H8 + RD5 test beams

• CAST (LHC-P8) cryogenics• SC Magnet and Cable Test Facilities @ SM18

and Meyrin Site bldg. 163• Cryolab Central LHe distribution service @

Meyrin Site bldg. 165

Organization of the cryogenics operation service CRG-OD

• Dedicated CERN operation team of 5 technicians (on-call) for LHC detector cryogenics

• FSU operation team (on-call) with CERN expert technician and engineer support for cryogenics related to activities at North Area, CAST, Meyrin Site bldg. 163/165

• FSU operation team (on-call) with CERN expert technician and engineer support for cryogenics at SM18 test facility

• Alarming (grouped and prioritized) is done via MOBICALL and the CCC-TI shift team. Works very reliable.

• Interventions of cryogenics operation team are coordinated via CCC-TI and the experiment control rooms of ATLAS/CMS

• Tech. expert support (mechanics, instrumentation, control system) can be called in by operation teams if required (on-call).

Outlook/Conclusion• The cryogenics alarming service works well and

reliable, based on several components (cryo shifter, CCC-TI, MOBICALL)

• TETRAS could be a complementary system for cryogenic services for replacing/standardising existing safety devices/procedures (ODH, “Homme Mort”)

• TETRAS could be complementary communication system giving fire brigade, CCC-TI direct access to information from cryo operation.