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Progress on MgB2 at CERN
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Transcript of Progress on MgB2 at CERN
Progress on MgB2 at CERNA. Ballarino, CERN
A. Ballarino, B. Bordini, S. Giannelli, J. Hurte, A. Jacquemod and L. Rossi
April 9th, 2014
-Electrical transmission: powering of superconducting magnet circuits via remote distance
The project: Hi-Luminosity upgrade of LHCPowering of new Hi-Luminosity magnetsPowering of existing LHC magnet circuits
Objective: provide flexibility in the location of the power converters and of the cryostats containing the current the leads in cases where space is limited and the radiation environment harsh. Use long distance superconducting links between power converters and magnets
Why MgB2 for the LHC Hi-Luminosity Upgrade
A. Ballarino, CERN
Itot 3 MA48 Cryostats1200 HTS Leads
Powering the LHC circuits
A. Ballarino, CERN
Powering the Hi-Luminosity LHC circuits
P1
P6 P4
P2
P8
P3
P5
P7
P1
P6 P4
P2
P8
P3
P5
P7
Betatron Cleaning Collimators
CMS
ATLAS
Where in the LHC ?
A. Ballarino, CERN
Superconducting Links
Superconductor operating at higher temperature: simplified (He gas) and relaxed (temperature margin) cryogenic cooling
Tunnel
Surface
1.9 K
5 K
T 25 K
Maximum operating temperature of the cable = 25 KHe gas cooling
Operation in self-field (B <1 T)
A. Ballarino, CERN
Superconducting Links Specification
A. Ballarino, CERN
-Total number of superconducting links planned to be installed in the LHC: 8
Lenght of superconducting links: 300 m to 500 m Multi-cable assembly Cable current rating: up to 20 kA Number of cables inside the link: up to 50 Total current capability: up to 150 kA
Total length of superconductor > 1000 km (7 tons)
MgB2 wire specification
Ic(20 K, 0.5 T) > 500 AIc(25 K, 0.5 T) > 400 AIc (30 K, 0.06 T) > 300 AJc,eng(20 K, 0.5 T) > 630 A/mm2
Jc,eng(25 K, 0.5 T) > 500 A/mm2
Jc,eng(30 K, 0.06 T) > 380 A/mm2
n-value (25 K, 0.5 T) > 30 Φ of strand < 1 mmCopper stabilizer 12 %RRR Copper stabilizer* > 80 Bending radius* < 100 mmCritical tensile strain (RT)* > 0.3 %Unit length 1000 m
A. Ballarino, CERN
MgB2 wire
3.60.67 mm2 1.61.6 mm2
1.11.1 mm2
Ni Matrix12 MgB2 filamentsCu core – Fe barrierff 14 %
Monel Matrix30 MgB2 filaments Nb + Ni barrierff 10.4 %- 18 %
= 0.98 mm = 0.85 mm
A. Ballarino, CERN
Wire produced at Columbus Superconductors, Genova
MgB2 wire
2012 20132008Year
+ uniform Ic+ 0.3 %+ RB 100 mm
A. Ballarino, CERN
H 4 m
L = 20 m SC Link Test Station @ CERN
A. Ballarino, CERN
MgB2 cables
20 kA Six cables, = 19.5 mm
Concentric 3 kASeven cables, = 8.4 mm
0.4 kAFour cables
0.12 kAEighteen cables
ext 65 mm
18 MgB2 wires = 6.5 mm
CuMgB2 , = 0.85 mm
Hi-current MgB2 cables – Ex LHC P1 and P5
A. Ballarino, CERN
Mass 11 kg/m(880 kg for H=80 m)
Itot= 150 kA
H=80 mL 24 cm
RB1.5 m
Semi-flexible cryostat external diameter = 220 mm
Hi-current MgB2 cables – Ex LHC P1 and P5
A. Ballarino, CERN
18 MgB2 wireswire = 0.98 mmCable = 6.5 mmTw = 400 mmLtot=210 m
LHe (L=2 m)
GHe (L=10 m)T < 1 K
+ -
5000 A
= 6.5 mm
10507 A
Measurement on MgB2 cables, 210 m
LHC Nb-Ti cable6 kA Operated at T<6 K
3 6 kA
A. Ballarino, CERN
Measurements on MgB2 cables, 220 m
Reached 20 kA at 24 K in two cables, each 20 m long, operated at CERN at 24 K in forced flow of helium gas(20th of February 2014)
Record in current in MgB2 cables
operated at higher temperature
A. Ballarino, CERN
2013 202320182017201620152014
SC Links at LHC P7
SC Links atLHC P1 and P5
Test ofhorizontal lines
Test ofvertical lines
20 m 60 m
Series P7 Series P1 and P5
Conductor for series
Timeline
A. Ballarino, CERN
Thanks for your attention !