Report from Session 2 Main Dipoles
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Transcript of Report from Session 2 Main Dipoles
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Report from Session 2 Main Dipoles
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Bi-2212(YBCO)
NbTi
?
Nb3Sn
Bi-2212(YBCO)
NbTi
?
Nb3Sn
P. McIntyre 2005 – 24T ss Tripler, a lot of Bi-2212 , Je = 800 A/mm2
0
20
40
60
80
0 20 40 60 80 100 120
y (m
m)
x (mm)
HTS
HTS
Nb3Snlow j
Nb-Ti
Nb-TiNb3Snlow j
Nb3Snlow j
Nb3Snhigh j
Nb3Snhigh j
Nb3Snhigh j
Nb3Snhigh j E. Todesco 2010
20 T, 80% ss30% NbTi55 %NbSn15 %HTS All Je < 400 A/mm2
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Conductor• NbSn: 15- 16 T (80% ss !!)
– Developed, existing in moderastre quantities (tons); for ITER (less Jc) 400 tons
– Needs improvement in mechanical, stability– Instability is an issue but we can manage– A reduction 2 in – projected- cost is an asset– 2 manufacturers only: 1 at good level, 1 near
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Bi-2212
Ic=348A
Ic=186A
Ic=438A
Ic=488A
Without insulation With insulation
Coil section 1 Coil section 2
Short samples
HTS (Bi-2212): needed for B > 16 T (at 80%) 40% cost of material for 20% fieldJe = 100-200 A/mm2 today; difficult material; HEP is almost only client…Either a strong program or very likely to be abandoned
Ts
T1
Tp
Rc2R
c3
Rc1
Rc4
Time,h
Tem
pera
ture
,o C
Key step!
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YBCO
YBCO: may be a great hope: many developersCost is –still- stellarLack of multikA compact cable may be a killer…
The many developers guidfed by othertr applications (Power, electrical devices…)
If we want gain we need to choose between Bi-2212 and Ybco, then push and guide development
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New ideas needed…what do they need to be developed?
We might go far to eliminate all of these problems if we could fully texture the powder in the subelements:
But how to do it?
6 mm
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Magnet Development Chart
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LBL:16 T reached with bladder system…
D20 RD3 HD1
“common-coil”“cos-theta” “block”
13.8T, 199750mm bore
14.5T, 2001 16T, 2003
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Adding a bore…
6
7
8
9
10
11
12
13
14
15
16
0 5 10 15 20 25 30 35 40 45 50
Bore
fiel
d (T
)
Training quench #
HD2a
HD2b
HD2c
HD2d
HD2e
Short sample limit
HD2: 43 mm boreTarget @ 4.2 K : 15.6 T
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Extensive investigation of superconductor and classical structure
15000
17000
19000
21000
23000
25000
0 10 20 30 40 50 60 70 80
Quench Number
Que
nch
Cur
rent
[A]
Iq(Inner)
Iq(outer)
dI/dt>20
PIT Models: Bmax=9.4/10.2T @4.5/2.2K (100% of SSL).RRP-108/127 coil: Bmax= 11.4T @4.5 K (97% of SSL)
instabilities at ~21kA
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Conclusion from NbSn US program…
• @ FERMI• 20 dipole and 35 quadrupole 1-m long coils• Reasonable size reproducibility • Short fabrication time• 2 dipole and 14 quadrupole 4-m long coils• From CORE programs + LARP• 11 T in dipoles and quadrupoles: we can count on
it (but development on conductor and structure still needed…)
• 13-15 T in view, but 3 years needed…
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Getting acquainted with HTS in special applications: BNL
• We have successfully designed, built and tested a large number of HTS coils and magnets:– Number of HTS coils built: ~100– Number of magnet structures built and tested: ~10
• We are performing HTS magnet R&D on a wide range of programs: – High T, low B (several, in house)– Medium T, medium B (3 funded programs)– Low T, high B (>20 T, 2 funded programs)
FRIB
Main coil: layer woundBucking: double pancake
YBCO: 25 T – 100 mm solenoids for SMES…
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KEK : Nb3Al and more…
Nb3Sn
Compressive Load
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Europe: Fresca-2 (2013)
• Making a detailed 3D model is important: the devil is in the detail
• 3D turn by turn model
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Hot points…• Radiation facility (HiRadMat @ CERN)• Design : for B>13-14 T consensus toward block design. Proved ? Not yet!• Aperture: needs more than educated guess (small aperture favor block vs
cos)• CONDUCTOR
– Is the performance driver– Is the cost driver– 20 T: 4 G(CHF-$-€)
• Mitigation measure: 15-16 T range• Assess real margin (80%, 90%?)• Needs to drive (and finance) development: Ybco > Bi-2212
• HL-LHC (11 T DS dipole, IR magnets @ 13 T) is a valid test bed• Other specific issues: protection & powering, stress management, small
aperture, two-in-one design