US Magnet Development Program Bi-2212 WG meeting, Sept 2, 2021

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US MDP Bi-2212 WG meeting

Tengming Shen, Laura Garcia Fajardo

Lawrence Berkeley National Laboratory

Ernesto Bosque, Jun Lu, Lamar English, Daniel Davis, Jianyi Jiang, Youngjae Kim, Ulf Trociewitz, Eric Hellstrom, David Larbalestier

National High Magnetic Field Laboratory

Emmanuela Barzi, Alexander Zlobin

Fermi National Accelerator Lab

Outline

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• US MDP Bi-2212 WG meeting: Monthly or once every two months?

• Bi-CCT1/SMCT first mirror magnet coil production schedule and coordination with RENEGADE commissioning.

• The gap between the magnet performance and the wire plateau JE(B).

Coil size – growing in sizes - Bi-CCT1 and Bi-CCT2 – an overview3

BIN5

0.4 m long2.5 T dipole

Bi-CCT1/2

0.9 m long5/7 T dipole

Bi-CCT1 + Nb3Sn CCT6 or SMCT11T

11 T and above

2212CCT

We are here.

BIN5 + CCT5

RENEGADE, 1.2 m x 250 mm dia. homogeneity zone, 50 bar cold wallUlf Trociewitz on commissioning

Bi-CCT1

CAD by R. Hafalia Jr.

85 cm

Bi-CCT1 production schedule (tentative)

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Time Budget estimation for Bi-CCT1 (MDP2020, task Alla-M3a), Tengming Shen

Step # TaskDuration (months) Completion date

1 PO submission2 Wire fabrication 6 Completed3 Wire characterization 3 Next steps4 Cable fabrication 35 Cable insulation 1 May-216 Mandrel fabrication 2 Oct-217 Mandrel preperation 2 Dec-218 Winding + package for shipping 1 Jan-229 Reaction - OPHT 3.5 May-22

10 Instrumentation 1 Jun-2211 Impregnation 2 Jul-2212 Magnet assembly 2 Sep-2213 Magnet test 1 Oct-22

Sum - duration (months) 27.5Sum -completed (months) 13

• Mandrel pre-oxidation treatment – which furnace?• RENEGADE operation readiness. • Bi-CCT coil reaction (01/15/2022 to 05/01/2022)

• Is it feasible and how to prepare?

• SMCT coil reaction in the range of January 2022 too?

The magnetic design of the BIN5c1: Magnetic field profile

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Field constant = 1.6414 T/3.6 kA = 0.4559 T/kA.

CCT BIN5c_1 and _2 Layer 1 Layer 2

Mandrel OD (mm) 47.3 64.7

Mandrel ID (mm) 30.8 51.3Mandrel length (cm) 39 39

Turn No. 16 16

Cable length per coil (m) 5.7 8

Dipole field in the bore (T)

2.5 T@5580A

• Suitable as an insert in 90 mm bore Nb3Sn CCT5.

Strand Ic data by Jianyi Jiang of NHMFL

BIN5c1 performance compared to other coils – a gap exists between coil performance and that expected from the plateau wire JE(B)

6T. Shen, and L. Garcia Fajardo, Instruments 2020, 4(2), 17;

Gap

The Lollapalooza Effect – how to quantify and address?

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• The DELTECH homogeneity zone too short?

o Might be the case for BIN5aOL. One of the three witness samples had a Ic(5 T) of about 350 A.

o Will go away soon.

• Cabling degradation?

o Make sense to react 2 m long barrel samples of (Rutherford cable) extracted strands, two each at one

Tmax

and five Tmax

from 885C to 895C? (2 x 5 samples – 10 samples)

o Compare Ic(B) between kinks and straight sections.

• Insulation poisoning and leakage?

o Make sense to react 2 m long barrel samples of (Rutherford cable) extracted strands, with TiO2

coating

and mullite insulation. (2 x 3 samples – 6 samples?)

• The role of wire architecture – 55x18, 0.8 mm diameter versus 37x18, 0.8 mm diameter.

• The TiO2 shelf life (for protecting strands against leakage)?

• The ‘exacerbated sausage effect’ in OPHT Rutherford cable?

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Sample needed for the barrel samples on the previous slide - 2 m long 17-strand Rutherford cable (LBNL1109 (PMM180207, its sister cable LBNL1110 was used in RC7n8 and will be used in Fermilab’s SMCT magnet. two pieces left(38 m and 28 m). Cable length per coil is 35 m and 23 mJ

o Preferred to be cut after the winding of Bi-CCT1 in Jan 2021, o Or take the risk of cutting short the cable. It is immediately available.

• 17 x 2.4 m cabling remnants (round PMM180207, 55x18, 0.8 mm, Engi-Mat lot 103) available for wire rolling experiment.

Other topics

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• US MDP Bi-2212 WG meeting: Monthly or once every two months?

• 3D printing Inconel.

• A follow up meeting in 2 weeks – Wed at 4 pm eastern time?