lucio rossi cern videoconference usa-jp of 26 july 2011

FP7 Eucard2 – WP on HTS Magnets (including results from 22 July meeting

EU partners)term of reference: edms doc. 1152224

Lucio RossiCERN

Videoconference USA-JP of 26 July 2011

Lucio Rossi @ videoconference for Eucardf2-Magnet

2

Use of Bi-2212 and YBCO: both are promising so far

10

100

1,000

10,000

0 5 10 15 20 25 30 35 40 45

J E(A

/mm

²)

Applied Field (T)

YBCO: Parallel to tape plane, 4.2 KYBCO: Perpendicular to tape plane, 4.2 K2212: Round wire, 4.2 K

Nb3Sn: High Energy Physics, 4.2 KNb-Ti (LHC) 1.9 K

YBCO B|| Tape Plane

YBCO B|_ Tape Plane

2212RRP Nb3SnNb-Ti, 1.9 K

Maximal JE for entire LHC Nb Ti strand

production (–) CERN-T. Boutboul '07, and (- -) <5 T data from Boutboul et al. MT-19, IEEE-TASC’06)

Compiled from ASC'02 and ICMC'03

papers (J. Parrell OI-

ST)

427 filament OI-ST strand with Ag

alloy outer sheath tested at NHMFL

SuperPower "Turbo"

Double Layer Tape

26 July 2011


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The goal is a dipole of 20 T designed @ 25 T short sample (4.2 K)

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

Material N. turns Coil fraction Peak field Joverall (A/mm2) Nb-Ti 41 27% 8 380 Nb3Sn (high Jc) 55 37% 13 380 Nb3Sn (Low Jc) 30 20% 15 190 HTS 24 16% 20.5 380

By Ezio Todesco, Malta workshop on HE-LHC

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Why we need to decide it now

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The scientific aim:first Superconductor

1) Development of 10 kA – 20 T class HTS superconductor with collider characteristics: a. JE of 5-600 A/mm2 at 20-25 T in the wire/tape to allow effectively 400 /mm2 in the coil

package (Joverall). Characterization at variable temperatures from 1.9 to 80 K. b. Compaction factor: > 85% c. Ramp characteristics: effective filament size < 70 m , losses < 0.01 W/m (with ramp of

1 mT/s), suppression of inter-strand current (metallic or ceramic interleave) d. Ability to withstand high transverse stress of 120-130 MPa (development of

reinforcement). Moderate creep and hysteresis. e. Homogeneity between strands (round or flat): better than 5% over long length and 10%

between different units. f. Long term stability of the physics characteristics in reasonable environment.

26 July 2011

10mT/s


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The scientific aim : develop a real Accelerator Magnets at modest field

1) Design and construction of a 10 kA demonstrator collider magnet, capable of central field B > 5 T in a useful bore of 40 mm.

a. Margins: in Ic > 20%, and better than 10 mJ as MQE. b. Full bore for the beam: evaluation and tests of both cos ends and flat race-track with

flare ends c. Geometric field accuracy: better than 0.05%. d. Full support of the forces by thin structure e. Precise alignment f. Protection as single magnet with only external quench heater (condition of the

machine)

g. Designed to be used also as insert of a 20 T

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The scientific aim: the addition that can make the difference

1) Test the demo magnet as insert of an existing magnet (FRESCA2 or another more suitable magnet) to prove the concept of boosting the field of a Nb3Sn dipole from 15 to 20 T (present HE-LHC baseline)

a. Design of force and stress containment b. Design of protection: operation with separated power supply and protection by passive

and active device.

c. Test at different temperature

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Participation of EU industry

• Bruker HTS: OK probably on the fiorm of « beneficiary », i.e. full participants in EU language. YBCO

• Nexans : they discontinued Bi-2212 wire production. However they are among the main providers of Bi-2212 powder to OST!A program to boost the « leadership » of EU in the domain of the powder is desirable

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Possible cost breakdowndraft after first EU meeting of 22 July

Table of cost of 8-10 years experience staffDirect Staff cost 8-10 years (k€/y)

Coeff. overheads (%)

TOTAL Staff cost (k€/y)

CH 97.50 160.00 156.00FR 65.40 160.00 104.64DE 64.60 160.00 103.36IT 41.97 160.00 67.15NL 71.06 160.00 113.70UK 67.66 160.00 108.26

TABLE at 45% reimbursement rate (except CERN)

NationPerson-months FTE-y

Direct Personnel Cost (k€/y)

Total cost personnel (k€/y) 1.6 OH

Cost Material (k€) TOT cost

EU request %

EU request k€

CERN INO 95.00 7.92 771.85 1,234.97 400.00 1,634.97 25.00 408.74CEA FR 60.00 5.00 326.99 523.18 180.00 703.18 45.00 316.43CNRS FR 21.00 1.75 114.45 183.11 70.00 253.11 45.00 113.90INFN IT 38.00 3.17 132.90 212.64 160.00 372.64 45.00 167.69KIT DE 24.00 2.00 129.20 206.72 80.00 286.72 45.00 129.02UniSouth UK 18.00 1.50 67.66 108.26 50.00 158.26 45.00 71.22UniGE CH 18.00 1.50 97.50 156.00 50.00 206.00 45.00 92.70UniTwe NL 21.00 1.75 124.36 198.98 70.00 268.98 45.00 121.04Bruker HTS DE 18.00 1.00 64.60 103.36 500.00 603.36 45.00 271.51TOT 313.00 25.58 1,829.50 2,927.20 1,560.00 4,487.20 42.78 1,692.25CERN will do the 100 k€ order to HTS industry.Cost breakdown by Institute including already overheads in Personnel (60%) and Material(20%):

This allocation is just a first guess.Each figure must be substantiated by a real work, accepted by taks leader and WP leader.

The 45% target reimbursement, 25% form CERN, is relatively high. Institutes must be ready to go down to 40 or 35% (minimum) in case EU will cut its contribution

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WP leader and Task 1(Lucio Rossi - CERN)

Task1. Coordination and Communication. Task leader : CERN Participants: CEA, INFN, ??

Coordination and scheduling of the WP tasks

monitoring the work, informing the project management and participants within the JRA

WP budget follow-up

The WP COLMAG is composed by Collimation and Magnet : the share of the 2.5 M€ (fixed by ESGARD)to requires to EU funds is: 0.8 M € collimation and 1.7 M€ MagnetsTher deputy WP will be a person from Collimation.

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Task 2(Luca Bottura - CERN)

Task 2. 10 KA - 20T class superconductor development. Task leader : CERN Participants: CNRS, KIT, INFN, UniSouthampton, UniGeneva, UT

Development of Bi-2212 strands with suitable basic characteristics (see IV. 1)

Development of 10 kA cable in Bi-2212 with controlled inter-strand resistance Rc, high compaction factor and stress reinforcement.

Development of YBCO tapes with suitable basic characteristics (see IV. 1)

Development of 10 kA cable in YBCO with controlled inter-strand resistance Rc, high compaction factor and stress reinforcement.

Characterisation of the strands, tapes and cable at cryogenic temperature

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Task 3(Jean Michel Rey – CEA Saclay)

Task 3. 5 T HTS dipole magnet.

Task Leader : CEA Participants: CERN, INFN, ...

Design of the 20 T HTS insert for HE-LHC magnet, with definition of possible range of suitable parameter : J, magnetization, Rc, geometrical tolerance (random and systematic), strain level.

Design the 5 T dipole model – 45 mm free bore, 0.5 to 1 m long with the same conductor characteristics of the 20 T insert. Evaluate cos vs. race track topology, protection, etc...

Study of all components (insulations, mechanical, etc.) and tooling

Manufacture the cold mass and derive all mechanical parameters by means of the dummy coils; manufacture of different coils in Bi-2212 and YBCO

Completion of the dipole by assembly of the coil variants in the mechanical structure

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Task 4(Giovanni Volpini –INFN Milano)

Task 4. HTS Dipole Magnet cold test insert and test characterization. Task Leader INFN Participants: CEA, CERN, ...

Define the test programme and Instrumentation (linked to task.3)

Adaptation of the test facility and preparation for test

Power test and Characterization

Analysis and feed back to design (task2 and task 3)

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Task 5(Gijs de Rijk - CERN

Task 5. Very High Field TestParticipants: Task Leader: CERN Participants: CEA, ...

Design the modification to make the coils working as insert in one High Field facility: EuCARD Fresca2 dipole; high field large bore US dipole; Edipo dipole at EPFL-Villingen. Mechanics, protection, interface, multiple power supply operation, field correction.

Assembly of the modified 5 T HTS dipole inside the selected High field facility

Col power test and evaluation of quench behaviour and dynamic field correction by multiple power supply.

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Description of point of strenghts

• UNI Geneva (Carmine Senatore)– Capability of fabrication of Bi-2212 for study– Meas. Jc vs l and t in field and variable temp (gas flow) fro wire and tapes,

multiturn (80 cm)– Set up for th. Cond.– Magn. vs. tzime to study relaxation and ramp induced phenomena

• KIT Karlsruhe (Wilfried Goldacker)– Tensile strength faciltiy till 3 kA at LN – Continous bending test faciltiy till 300 A LN– Investigate cable topology properties with extend bending experiment in

different geometry– Study bending properties vs. Twist pitch for Roebled cable (flat ends, flare

ends, cos

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Items from 22 July Meeting

• Advice to do 4 year program rather than 3• Add a subtask on perspective of possible use of HTS AccMag

and how to implement it• Keep a close contact with Fusion community to share

technology and progress and industrial effort. Possible close collaboration also for test (EDIPO?)

• Keep a close collaboration with USA and JP partners: most probably the accent in EU will be on YBCO. For Bi-2212 EU (especially CERN) want to be fully on board but the main research wuill be probably in the USA.

• Only YBCO is fully produced in EU (tape) and is following the decision of Eucard to do the insert in YBCO

26 July 2011

lucio rossi cern videoconference usa-jp of 26 july 2011

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