AT/ECR CRYOGENICS

Organisation, Procedures and Communication with TCR

Presentation for TCR-ECR-ACRMeeting 2003 by K. Barth

Presentation Outline

• Cryogenics in General• Cryogenics at CERN• AT/ECR Cryogenics

Organisation, inventory & geographic location

• Alarming procedures and contacts• Summary

Cryogenics in general• Low temperatures (120 K <)

• Provide cooling of superconducting magnets and cavities at temperatures down to 1.8 K

• Refrigerators at low temperatures inefficient

• Magnets have big “cold mass” and can quench

• External heat load

CRYOGENICS IS A SPECIAL UTILITY, WHICH TAKES LONG TO RECOVER! (1 hour stop needs 5 hours recovery)

Helium Cryogenics• He4 (atomic mass 4) exists in air

(concentration 5.3 x 10-6)

• He4 is at room temperature ideal gas

• He4 is not solidifying

• Very weak formation enthalpy

• Density of LHe: 125 g/liter1 kg He = 8 liters LHe = 6 m3 GHecost approximately 30.- CHF

• He4 gets superfluid @ 2.17K, 50 kPa

• Main properties of superfluid:Volumetric mass: 145 g/literCapacity to transfer heat is very highViscosity is very low

Cryogenics at CERN• Cooling of superconducting magnets of the

LHC accelerator

• Cooling of superconducting cavities of the LHC accelerator

• Cooling of the superconducting magnets and calorimeters installed in particle detectors for LHC and other experiments

• Cooling of test benches for LHC magnets and superconducting cables

Organisation (ECR / ACR cryogenics)

• ECR cryogenics for experiments and (some) LHC test facilities

• ACR cryogenics for accelerators and SM18/PM18 LHC test facilities

• Operation and Maintenance of all ACR & ECR cryogenic installation is done via an industrial contract (C169) by the consortium AIR LIQUIDE/ LINDE / SERCO (ALLS)

AT - ECR Organisation

VIDE MECANIQUEELEC. &

INSTRUM.PLANIF. MAINT.

ACHATSCRYOLAB

W7ZONE NORD

W1ZONE OUEST

W2

J. MORENO F. BARACCO J. KASPRZYCKI D. JOUVE

J. BOUTTAZ S. CALLEJA C. MIZRAHI

G. CLERC B. DEFINOD

L. MURAT

R. CHANUT

ORGANISATION AIR LIQUIDE-LINDE-SERCO

ORGANISATION CERN

K. BARTHL. STEWART

R. GIRARDOTC. PIVIDORIF. METRAL

D. DELIKARIS

R. CONSENTINO L. STEWART S. JUNKER

H. BERG (LINDE)M. MIGEVANT (AL)D. MITCHELL (SERCO)

MAINTENANCEO. GEHU / F. BARACCO

OPERATIONSM. CUGNET

I. SOURISSEAU

J. M. CHAVEROU

M. JOLY-POTTUZ

L. ALAUXS. RAMBAUD

C. LUGUET

S. PROST-TOURNIER

P. CLER

N. LEDUC

J.C. CARRERE

S. GUIDO

• North Area Fixed Target Experiments:COMPASS, NA49 (2), ATLAS/H8, CMS/RD5

• NA LHC magnet test facility block4

• CERN Axion Solar Telescope PA8

• LHC Cable Test Facility Meyrin bldg. 163

• Cryolab Central Liquefier Meyrin, bldg. 165

• ATLAS Magnet Test Facility Meyrin, West Area Hall 180BT magnet test bench (1.2 kW plant)Solenoid test bench (BOC plant)

• COLDEX, SPS BA4

LHC8TCF200CERN Axion SolarTelescope (CAST)

LHC5CMS CRYO

LHC7

LHC3

ATLASLHC1

LHC2

LHC6

1 km

SPS

CERN LAB 1Meyrin

CERN LAB 2Prevessin

LHC4

NA CRYOCrtl. Room

CRYOLABCrtl. Room

WA CRYOCrtl. Room

ATLAS MagnetTest Facility2 cryoplants (1.2 kW + BOC)

LHC SC Cablet Test FacilityCentral Liquefier2 cryoplants (TCF50)

SPS Fixed Target Exp.:NA49COMPASSCMS/RD5ATLAS/H85 cryoplants (CNA100)LHC/Bl.4 Test Facility (CNA100)

Cryoplants in operation for Experiments & Test Facilitiesat CERN (2003)

AT/ECR 12 Cryoplants in operation (2003)

Alarming (TCR Procedure)

• Standby duty (piquet) operator for each cryo zone / control room• Surveillance of the general alarm transmitted automatically from the ABB

monitoring and supervisory system of the zone to the automatic alarm notification system (ANS) and in parallel to the alarm monitoring system of the technical control room (TCR)

• In case of a an alarm without a feedback of the responsible on-call operator (within 15 minutes), TCR operators try to reach cryogenics responsibles, respecting the following priority order:1.) Call ALLS on-call operator of the zone (GSM & private number), if not reachable2.) call ALLS on-call engineer (160683), if not reachable3.) call CERN responsible technician of the zone, if not reachable4.) call CERN responsible engineer

K. Barth (163204, private tel. +33 (04) 50 20 88 45)

Alarming (ANS configuration 1)

• North Area zone (Prevessin Site)COMPASS, NA48 (LN2), NA49 (2), ATLAS/H8, CMS/RD5, LHC/Block 4Crtl. Room: 76821, On-Call: 160041, CERN Resp.: L. Stewart (160720) ALARME CRYOGENIE ZONE NORD LEP 1 Fault family: CRYO_GENERAL_PREFault member: CRYO-6Fault code: 20Fault description: DEFAUT GENERAL

• CERN Axion Solar Telescope (CAST) – LHC Point 8CRYO REFRIG LHC CAST_COLDBOX /SR8 2875R DEFAUT GENERALCrtl. Room: 76821, On-Call: 160041, CERN Resp.: L. Stewart (160720) Fault family: CRYO_REFRIG_LHCFault member: CAST_COLDBOXFault code: 20Fault description: DEFAUT GENERAL

Alarming (ANS configuration 2)

• Cryolab zone: 163, 165, 253, 243 (Meyrin Site)LHC Cable Test Facility (bldg. 163), Central Liquefier (bldg. 165), Helium Gas Management & Recovery (bldg. 243 & 253)Crtl. Room: 78802, On-Call: 164270, CERN Resp.: R. Consentino (160713) ALARME CRYOGENIE BAT 163, 165, 253Fault family: SERV_DIVERS_MEYFault member: RDP-X25Fault code: 1640Fault description: COMMANDE BEEP BOITE FROIDE

• ATLAS WA zone: Hall 180 (Meyrin Site)ATLAS BT magnet test bench, Solenoid test benchCrtl. Room: 72365, On-Call: 160124, CERN Resp.: S. Junker (164184)

Summary

• ECR cryogenics operation relies on good & fast communications with TCR in case of alarms

• While ANS is not working, calls from TCR is the only way to know about alarms, occurring outside normal working hours

• When ANS is working, calls from TCR will assure that cryo alarms have been noticed

• TCR is the communication interface to/from the users for information concerning cryogenics

• TCR is the co-ordination interface to the other external utilities (electricity, cooling and ventilation) required by cryogenics