Abstract
| In this work, we extend the experimental demonstration of partially-insulated, ultra-radiation transparent detector
magnet technology based on a 3D-printed aluminium alloy support
structure containing 10% of silicon. This demonstrator magnet has
a bore diameter of 390 mm, effective wall thickness of 3.7 mm, and
it has 15 turns corresponding to 19 meters of HTS conductor. The
HTS conductor of the magnet consists of a stack of four ReBCO
tapes with a width of 4 mm. We measured the magnet to be fully
superconducting at 4.2 K with an operating current of 4.5 kA. A
time constant of the magnetic field delay to a current step measured
was 83 s. This detector magnet technology may be used in future
particle detector magnets, such as the AMS-100 solenoid, where
one of the key design requirement is a passive self-protection by
partial-insulation which ensures continuous operation and stable
magnetic field even with a locally damaged conductor. |