High Field Magnet R&D with YBCO
-
Upload
templeton-luka -
Category
Documents
-
view
26 -
download
1
description
Transcript of High Field Magnet R&D with YBCO
Superconducting Magnet Division
Ramesh Gupta High Field Magnet R&D with YBCO July 26, 2011 Slide No. 1EUCARD2 VIDEO CONFERENCE
High Field Magnet
R&D with YBCORamesh Gupta
Brookhaven National LaboratoryNew York, USA
Superconducting Magnet Division
Ramesh Gupta High Field Magnet R&D with YBCO July 26, 2011 Slide No. 2EUCARD2 VIDEO CONFERENCE
Relevance of HTS R&D at BNL to LHC-HE
BNL has a significant HTS R&D program with a large portion of it directly
related to high field magnets
At this early stage, the question is: Can we learn to use HTS (which is very
different from LTS) to make high field magnets (irrespective of the geometry)
Can HTS magnets (with different quench properties) with large stored energy
be protected? A million dollar question with a million dollar R&D program
Currently funded programs for next 2 years with sizable YBCO coils:
20+ T HTS (then more) with number of coils using ~3 km of YBCO tape
~25 T large bore magnet using about a million dollars of YBCO
8 racetrack coils, each using ~1 km, 4 mm equivalent tape
Join us NOW to get real experience and help make above programs successful
Superconducting Magnet Division
Ramesh Gupta High Field Magnet R&D with YBCO July 26, 2011 Slide No. 3EUCARD2 VIDEO CONFERENCE
BNL/PBL SBIR for High Field Solenoid (Ultimate Goal ~40 T)
• Required coils with 2G HTS built and tested in LN2
• Technology proved for 20+T with background field@NHMFL
• Next phase:
• Demonstrate a well protected 20+ T HTS magnet
• Demonstrate higher fields with LTS & background field
Join us now for remaining challenging tasks
0
10
20
30
40
50
60
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Ic (
A)
Coil I.D.
Proof: Coils with the second generation HTS Can be Built and Tested Consistently without Degradation
Field parallel ~0.5 T; field perpendicular ~0.3 T @40 A
Superconducting Magnet Division
Ramesh Gupta High Field Magnet R&D with YBCO July 26, 2011 Slide No. 4EUCARD2 VIDEO CONFERENCE
High Field HTS Magnet for SMES
(Partners: BNL, SuperPower & ABB)
Field: ~25 T
Inner Diameter : ~100 mm
Conductor: ~10 km, 12 mm wide 2G tape
Stored Energy: 2.5 MJ
Ramp up and ramp down time : 10 minutes
Large bore HTS Magnet for Superconducting Magnetic Energy Storage (SMES)
• Conductor: Develop 600 A (~500 A/mm2) at 30 T in any field direction• Magnet/coil technology: Very large stress and strain on conductor• Quench protection: Self stated overall risk rating to program – high
Many questions are similar to accelerator magnets
High risk, high reward R&D with several challenges – join us now
Superconducting Magnet Division
Ramesh Gupta High Field Magnet R&D with YBCO July 26, 2011 Slide No. 5EUCARD2 VIDEO CONFERENCE
HTS Quench Protection R&D at BNL (development of hardware and understanding)
We recognize that quench protection in HTS poses a major challenge.
Significant R&D program on hardware, software, measurements for scientific
understanding, etc. is underway with funding from several sources:
• SMES
• FRIB
• PBL/BNL SBIR
• Base program
• LDRD (funding decision awaited)
A budget of ~1 M$ shows the level of interest.
But all areas are still not covered.
We welcome collaborations.
Superconducting Magnet Division
Ramesh Gupta High Field Magnet R&D with YBCO July 26, 2011 Slide No. 6EUCARD2 VIDEO CONFERENCE
Large Racetrack Coils with YBCO
0
1000
2000
3000
4000
5000
6000
7000
8000
0 20 40 60 80 100 120 140 160 180 200 220
Coi
l Vol
tage
(mV
)
Current (A)
• The baseline design of Quadrupoles for the Facility for Rare Isotope Beams (FRIB) consists of significant size HTS racetrack coils
Each coil uses over 1 km equivalent of standard 4 mm 2G HTS tape
• Unique opportunity to test large 2G HTS coils made with tape from multiple US vendors
• 8 coils built (4 with SuperPower and 4 with ASC)
• Successful construction, test and demo of quench protection of large HTS coils should be useful to LHC upgrade.
• The current plan, however, is limited to medium field ~40 K testing (FRIB need).
• Additional 4K high field tests of these large size HTS racetrack coils could provide useful technical data for LHC.
Coil with 4 ply 2G ASC Tape
Superconducting Magnet Division
Ramesh Gupta High Field Magnet R&D with YBCO July 26, 2011 Slide No. 7EUCARD2 VIDEO CONFERENCE
A Magnet for Background Field Coil Testing
• A magnet has been designed and built with a large clear space for efficient
testing of HTS insert coils in high background field (no need to disassemble)• Major difference from preparing a magnet every time for each insert coil test• Large clear space: ~240 mm high, ~30 mm wide, ~500 mm long• Successfully tested at self-field of 10.4 T (higher field with insert coils)
This unique magnet is safely stored – can be brought into service with proper collaboration/funding
Superconducting Magnet Division
Ramesh Gupta High Field Magnet R&D with YBCO July 26, 2011 Slide No. 8EUCARD2 VIDEO CONFERENCE
Alternate Approach for Magnets with 2212 Rutherford Cable:
React & Wind
Wire: Showa, Cable: LBL, Reaction: Showa, Test: BNL
0
500
1000
1500
2000
2500
3000
3500
4000
4500
0 1 2 3 4 5 6 7 8 9
HTS Coil Production No.
I c (
4K,s
elf
fiel
d),
Am
ps
Ic
Earlier coils <1 kA (~2001)
Later coils 4.3 kA (10/03)
Self-field <0.05 T
Self-field ~ 1.85 T
R&W Bi2212 cables, coils & magnets carried significant current (still record?)
Coil wound and tested@BNL in a common coil magnet
Two approaches:• Develop conductor to do what we are used
to• Develop magnet designs to fit the
conductor
Ultimate goal is to develop accelerator technology to do physics (not certain type of conductors or magnets). We (both magnet scientists and machine physicists) have time to learn how to use these new conductors.
Recall history: Copper Vs. SC magnets
Superconducting Magnet Division
Ramesh Gupta High Field Magnet R&D with YBCO July 26, 2011 Slide No. 9EUCARD2 VIDEO CONFERENCE
SUMMARY
• BNL has a significant HTS R&D program which covers a wide range. A large
part of it will directly benefit LHC-HE upgrade with high field magnets.
• All are invited join us in this exciting R&D
Benefit to participants: real hands on experience beyond paper studies.
Benefit to us: extra support and your intellectual contribution.
• We don’t have extra funding to provide direct support but believe at present
we have several programs to provide early opportunity to understand the
challenges associated with high field HTS magnets and develop technology for
future.
• At an individual level, collaborators will find unique challenges and be able to
make contributions of lifetime. Such opportunities don’t come too often.