HQ TEST PLANS @ CERN

by Marta BajkoCERN TE-MSC TF

For Hi Lumi and LARP the 16th of November 2011 CERN

Summary

• Cryogenic test station status at CERN• Which cryostat we can use? Characteristics• Which measurements can be done?

– Electrical integrity (HiPot, Insulation, Continuity)– RRR during cool down and warm up– Splice resistance measurements– Inductance measurements– Powering test at 1.9 K and quench localization– Protection heater study if required– Ram Rate dependence study– Mechanical measurements with strain gauges– Magnetic measurements

• When the cold test can take place?

Cryogenic test station at CERN till 2010

A. Test station with 4 vertical cryostats for stand alone magnets located in Prevessin (building 892)

B . Tests station with 10 benches in horizontal position, optimized for the main LHC magnets located in point 18 (building 2173)

Cryogenic test station at CERN from 2011Tests station with 10 benches in horizontal position, optimized for the main LHC magnets, 3 vertical cryostats and supercritical test station located in point 18 (building 2173 called SM18)

Cryogenic test station SM18 layout

Horizontal test benchesVertical test benches

General View of the Vertical TEST station

HFM test cryostat

Long Cryostat

Diodes and Current Lead Cryostat

Super critical He Feedbox

Auxyliary cryostat

Sc Link

20 kA power ConverterDump Resistor

Control Room

Valve box

DAQ, Control and Cryo rack

With more details on the vertical cryostats

OPERATIONAL !!!….also working in

conditionsLHe( 4.2K and 1.9K)

and He gas with accuracy of <1 Kand up to 17 kAOPERATIONAL !!!First test at

13kA and 4.3K on the 11/11/11 done!

Cryostat design advanced ,

Current lead specification

should be started soon!!!

We plan to fabricate a new additional insert for long cryostat to get read of “dead time” ( change of magnets, installation

de-insatallation…)

The vertical cryostats characteristicsCryostat 1 (LONG)(existing in bl 4)

Cryostat 2(existing in bl 4)

Cryostat 3 ( FRESCA 2 )

Cryostat 3bis(existing in bl 4)

Useful length (mm) 3800 1600 3400-4000 1400Useful diameter (mm) 600 500 1800 800Cooling time 4.2 K (h) 44 5 32Cooling time 1.9 K (h) 12 2.5 8Consumption (l) 7300/8100 1100 4500/5030Consumption rate(l/h) 95/115 75 56/80Working temp (K) 1.9 4.2 1.9 and 4.2 1.9Working pressure (mbar) 1250 1250 1250 1250Max weight (t) 6 1.5 27-30 3Max energy (kJ) Tested: 500 7000Nr of current leads 2 x 13 kA +1 x 6 kA 2 x 15 kA 2 x 20 kA 2x 18 kA or 4x 200 A + 4 x 1200 ANr. of available inserts 1 1 1 2

The LONG cryostat that we will use for the HQ test

Magnet diameter 570 mm for a cryostat of 600 mm !!!

MAGNET SUSPENSION

Holes for CERNSupport rods fromlambda plate-20 mm thru-holes on 400 mm bolt-circle (shown)-To be designed by CERN.

MAGNET SUSPENSIONADAPTER PLATE(SUPPLIED BY CERN)

FOUR SHORTSUSPENSION RODS(SUPPLIED BY CERN)- Distance between adapter plate and pizzabox = 149 mm.- Rod diameter = 19.05 mm- Thread length on rods allows up to 44.5 mm thick plate.

Courtesy of Ray Hafalia LBNL

Which measurements we can do?

– Electrical integrity (HiPot, Insulation, Continuity)– RRR during cool down and warm up– Splice resistance measurements ( up to a minimum of 1 nOhm)– Inductance measurements( with di/dt)– Powering test at 1.9 K and quench localization with V taps ( eventually also quench

antenna but it represent an important extra work) – Protection heater study if required ( we need to know the time constant or the deposited

energy on the heaters to set up the circuits; we have up to 400 V or lower and fixed capacitor benches with units of 14 mF)

– Ram Rate dependence study ( min RR=15 A/s if Imax > 15 kA)– Mechanical measurements with strain gauges ( with the LBNL system )– Magnetic measurements ( See details with S. Russenschuck)

When we can test?

• We expect the magnet at CERN end of November 2011• Eventually to be installed in the insert end of December 2011• Test at warm and instrumentation; protection set up beginning

of January 2012• Cryo will start 16th of January 2012• Magnet test start 20th of January 2012