superconduttori e magneti a.ballarino te-msc-scd … · te-msc-scd cern, geneva . a. ballarino, ......
TRANSCRIPT
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Superconduttori e Magneti
A. Ballarino TE-MSC-SCD
CERN, Geneva
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A. Ballarino, 10/10/2014
Outline
Introduzione Superconduttivita’ e magneti per LHC Superconduttivita’ e magneti per LHC upgrades Conclusione
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A. Ballarino, 10/10/2014
Superconductivity for HE Physics The use of Superconductivity is important in the quest for higher energy
• Detector magnets provide magnetic field to determine the momentum of charged particles. Higher energies imply larger volumes and higher fields •RF cavities provide the electric field required to accelerate the beams of charged particles. Higher energies imply greater fields for a given length • Accelerator magnets provide magnetic field for bending and focusing particle beams. Higher energies imply higher fields for a given machine diameter greater energy for a given radius
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A. Ballarino, 10/10/2014
Synchrotron: E[GeV]=0.29979 B[T] R[m]
Accelerator energy and magnetic field
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A. Ballarino, 10/10/2014
Nb-Ti stand and cables for LHC
7 mm filaments
LHC inner cable
LHC outer cable cross section (15.11.48) mm2
Ic(1.9K, 10T)13750 A 7500 km (1200 tons) of Nb-Ti superconducting cables with extremely tight property control
< 1 mm 6300 filaments Ic(1.9K, 10T)510 A
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A. Ballarino, 10/10/2014
Coil winding
• Tight controls on – Winding quality – Dimensions (field quality)
• Spectacular precision (typical waviness in the range of 20 mm)
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A. Ballarino, 10/10/2014
Assemblaggio complesso
• Meccanica di precisione
• Grandi attrezzature
• Componenti speciali
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A. Ballarino, 10/10/2014
Magnet installation
• Logistic and planning
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A. Ballarino, 10/10/2014
LHC magnets LHC: 8000 magneti superconduttori 1232 dipoli (L=15 m, 35 tons) I magneti occupano 85% del tunnel LHC
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A. Ballarino, 10/10/2014
> 35% dipoli LHC fatti in Italia (ASG – Gruppo Malacalza) – 15 % del superconduttore – 20% componenti
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A. Ballarino, 10/10/2014
Barrel Toroid magnet system (bobine SC fatte in Italia, ASG)
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A. Ballarino, 10/10/2014
Alimentazione elettrica LHC
Discendenti di corrente 13 kA assemblati in CECOM, Roma
3 MA 3300 Discendenti di corrente 31 km HTS (BSCCO 2223)
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A. Ballarino, 10/10/2014
Tecnologie Sviluppo ed analisi di materiali superconducttori Assemblaggi meccanici Elettronica Sviluppo ed analisi di materiali strutturali e di isolamento Tecniche di impregnazione Criostati Elettronica Elettronica di potenza Instrumentazione Misure magnetiche Misure criogeniche …………… .............
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4 July 2012 Announcement of discovery of Higgs boson
LHC Integrated Total Luminosity
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A. Ballarino, 10/10/2014
F. Bordry, CERN Director for Accelerators and Technology
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A. Ballarino, 10/10/2014
Superconduttivita’
per Hi-Luminosity LHC
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A. Ballarino, 10/10/2014
LHC Achievements so far:
Higgs boson discovery Consolidation of Standard Model LHC expected integrated luminosity by 2020: 300 fb-1
Larger integrated luminosity required to extend the discovery potential of the LHC machine and answer to some fundamental outstanding questions
High Luminosity LHC: 3000 fb-1 in about 10 years
LHC High-Luminosity Upgrade The Physics Landscape
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SC links
IR quadrupoles in IP1 and IP5
Dipoles D1 & D2 in IP1/IP5
Matching section Q4 in
IP1/IP5
Collimation units (11 T MB) in IP2, possibly IP7/IP1/IP5
LHC High-Luminosity Upgrade
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LS2 - 2018
LS3 - 2023
11 T Dipoles , P2/P7 HTS SC Links P7/P1/P5
P1 and P5 11 T Dipoles and Triplets D1+ D2+Q4+ Correctors
HTS SC Links
L. Rossi, CERN ATS 2012-236
LS1
LHC High-Luminosity Upgrade: time frame
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A. Ballarino, 10/10/2014
Superconductivity for LHC-Hi Luminosity upgrade
Nb3Sn for high-field magnets (Bpeak12 T) MgB2 and HTS for power transmission lines
+ Nb-Ti for magnets
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A. Ballarino, 10/10/2014
Nb3Sn for LHC-Hi Luminosity upgrade
JC (kA/mm2)
Dfil (mm) RRR (-)
Performance Peak field
Cost
Stability Protection
Magnetization Field Quality
Stability
2.5
2
1.5
3
3.5
1
4
200
150
100
50
10
20
50 100
PIT
RRP
target
Nb3Sn wire JC(12 T)> 2.5 kA/mm2
Dfil < 50 mm RRR > 150
PIT 192 RRP 108/127
RRP 150/169
Nb3Sn cable
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A. Ballarino, 10/10/2014
Nb3Sn at 4.2 K
Nb-Ti at 1.9 K
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A. Ballarino, 10/10/2014
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A. Ballarino, 10/10/2014
• Nb3Sn coil – Reaction completed
• Nb3Sn coil – Winding/curing completed
Nb3Sn quadrupoles for LHC-Hi Luminosity upgrade
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A. Ballarino, 10/10/2014
Superconducting Links at LHC P1 and P5
80 m
LHC Tunnel
8-12 SC Links L300 m Up to 63 cables Icable up to 20 kA I=150-200 kA
Linee di trasferimento di corrente
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A. Ballarino, 10/10/2014
wire = 0.99 mm 30 MgB2 filaments Twisted filaments (LT=100 mm) eq_MgB2 = 62 mm ACu 5 % Awire
wire = 0.85 mm 37 MgB2 filaments Twisted filaments (LT=100 mm) eq_MgB2 = 56 mm ACu 5 % Awire (th=30 mm) Sn coating of Cu surface
Cu
Cu
MgB2 round wires
Fili prodotti da Columbus Superconductors, Genova
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A. Ballarino, 10/10/2014
20 kA Six cables, = 19.5 mm
Concentric 3 kA Seven cables, = 8.4 mm
0.4 kA Six cables
0.12 kA Eighteen cables
ext 65 mm
Superconducting Links, LHC P1 and P5
18 MgB2 wires = 6.5 mm
Cu
MgB2 , = 0.85 mm
44 MgB2 Cables
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A. Ballarino, 10/10/2014
Mass 11 kg/m (880 kg for H=80 m)
Itot= 150 kA
H=80 m L 24 cm
RB1.5 m
Semi-flexible cryostat external diameter = 220 mm
Superconducting Links, LHC P1 and P5
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H 4 m L = 20 m ext = 163 mm
Stazione di misura SM-18
Superconducting Links for LHC
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A. Ballarino, 10/10/2014
Superconducting Links, LHC P1 and P5
Criostati per Superconducting Links
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A. Ballarino, 10/10/2014
Superconduttivita’ e magneti
Dopo Hi-Luminosity LHC?
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A. Ballarino, 10/10/2014
The next step – hadron colliders
LHC 27 km, 8.33 T
14 TeV (c.o.m.)
VHE-LHC
80 km, 20 T 100 TeV (c.o.m.)
HE-LHC
27 km, 20 T 33 TeV (c.o.m.)
VHE-LHC
100 km, 16 T 100 TeV (c.o.m.)
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A. Ballarino, 10/10/2014
16 T or 20 T– First a question of conductor
T=4.2 K
LTS
BSCCO 2212
BSCCO 2223
Nb-Ti at 1.9 K
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A. Ballarino, 10/10/2014
16 T or 20 T– First a question of conductor
Nb3Sn
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Then of magnet technology
Courtesy of L. Bottura
16 T
Flat racetracks no bore
Record fields Practical magnets
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A. Ballarino, 10/10/2014
Superconduttivita’: cuore della ricerca della fisica delle alte energie Ampia gamma di tecnologie pertinenti a vari settori di ricerca L’upgrade in Luminosita’ di LHC dipende da sviluppi di tecnologie nell’ambito della superconduttivita’ – cosi’ come potenziali futuri upgrades in energia dell’acceleratore
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A. Ballarino, 10/10/2014
Grazie per la vostra attenzione !