Magnetics Business & Technology - July/August 2020 - 17

RESEARCH & DEVELOPMENT
The winding system has electronically controlled winding speed
and conductor tension. A tension force of 45 N was selected.
This is within the allowable level for the conductor size, and
ensures no liftoff of the conductor from the winding bobbin under
the maximum operating conditions, since liftoff could result in a
quench or mechanical damage.
The winding proceeded relatively smoothly. The main challenges
were associated with ensuring the uniformity of the conductor tape. Since the tape thickness is only 0.1 mm, it was quite
difficult to discern thickness uniformity across its 12-mm width
on a single tape. After winding about 50 turns, it was discovered
that the conductor was thinner on the edges by about 0.006 mm
compared to the central section. To adjust for this difference in
thickness, the edges were intermittently shimmed in the radial
direction with polyimide tape.

cal support. It was demonstrated during testing that the radial
and lateral shimming with proper shimming material did not
reduce the performance of the magnet.
The completed coil provides magnetic flux density greater than
6 Tesla on-axis within the 4-cm warm bore when operated at
4K-15K. It is one of the first in the world for a conductively cooled
HTS magnet operated at high current (up to 700 amperes). Figure 3 shows a close up of the bore.

After depositing about 20 turns past the first splice, it was discovered that the second section of the conductor tape was narrower
by ~0.1mm. This led to the formation of a step on the face of
the coil pack. Leaving the step in place would have resulted in a
lack of lateral support in this section of the winding, which would
further lead to mechanical damage to the conductor. In addition, because the magnet is conductively cooled from chill plates
clamped on the end-faces of the magnet, the clamping force
would not be constant in places where the tape was narrower,
creating a thermal deficiency for cooling and causing potential
damage to the conductor from the uneven clamping force.
To overcome this issue, lateral shims made of thermally conductive polyimide tapes (Kapton MP) were introduced to even out
the surface and assure a good thermal path and lateral mechani-

www.MagneticsMag.com

Figure 3. A close-up of the 4-cm warm bore.

July/August 2020 * Magnetics Business & Technology

17


http://www.MagneticsMag.com

Magnetics Business & Technology - July/August 2020

Table of Contents for the Digital Edition of Magnetics Business & Technology - July/August 2020

Magnetics Business & Technology - July/August 2020
Editor’s Choice/ Features
Norwegian Electric Systems Electrifies Work Ships & Ferries for Rugged Northern Seas
Goudsmit Develops Steel Sheet Separator with Fail-Safe Magnet & Assists Hyperloop Project in Netherlands
Development of a High-Field, Non-Insulated, High Temperature Superconducting Magnet for Fusion Research and Other Applications
Research & Development
Product News
Industry News
Events Calendar/ Advertising Index
Penn State Scientists Develop a New Mechanism to Harvest Stray Magnetic Fields
Visions
Magnetics Business & Technology - July/August 2020 - Magnetics Business & Technology - July/August 2020
Magnetics Business & Technology - July/August 2020 - Cover2
Magnetics Business & Technology - July/August 2020 - 3
Magnetics Business & Technology - July/August 2020 - Editor’s Choice/ Features
Magnetics Business & Technology - July/August 2020 - 5
Magnetics Business & Technology - July/August 2020 - Norwegian Electric Systems Electrifies Work Ships & Ferries for Rugged Northern Seas
Magnetics Business & Technology - July/August 2020 - 7
Magnetics Business & Technology - July/August 2020 - Goudsmit Develops Steel Sheet Separator with Fail-Safe Magnet & Assists Hyperloop Project in Netherlands
Magnetics Business & Technology - July/August 2020 - 9
Magnetics Business & Technology - July/August 2020 - 10
Magnetics Business & Technology - July/August 2020 - 11
Magnetics Business & Technology - July/August 2020 - 12
Magnetics Business & Technology - July/August 2020 - 13
Magnetics Business & Technology - July/August 2020 - 14
Magnetics Business & Technology - July/August 2020 - 15
Magnetics Business & Technology - July/August 2020 - Research & Development
Magnetics Business & Technology - July/August 2020 - 17
Magnetics Business & Technology - July/August 2020 - 18
Magnetics Business & Technology - July/August 2020 - 19
Magnetics Business & Technology - July/August 2020 - Product News
Magnetics Business & Technology - July/August 2020 - 21
Magnetics Business & Technology - July/August 2020 - 22
Magnetics Business & Technology - July/August 2020 - 23
Magnetics Business & Technology - July/August 2020 - Industry News
Magnetics Business & Technology - July/August 2020 - 25
Magnetics Business & Technology - July/August 2020 - 26
Magnetics Business & Technology - July/August 2020 - 27
Magnetics Business & Technology - July/August 2020 - Events Calendar/ Advertising Index
Magnetics Business & Technology - July/August 2020 - 29
Magnetics Business & Technology - July/August 2020 - Visions
Magnetics Business & Technology - July/August 2020 - Cover3
Magnetics Business & Technology - July/August 2020 - Cover4
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