High-Current Analysis Magnet

Categories: Beam diagnostics Ion species separation
Manufacturer: DREEBIT GmbH
The High-Current Analysis Magnet is a double focussing dipole magnet designed to bend ion beams by 90° for charge-to-mass ratio analysis of the ion beam components. The compact design is tailored for high-current medium-emittance beams such as mA currents from high-power electron cyclotron resonance (ECR) ion sources.
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Description

The High-Current Analysis Magnet is a double focussing dipole magnet designed to bend ion beams by 90° for charge-to-mass ratio analysis of the ion beam components. The compact design is tailored for high-current medium-emittance beams such as mA currents from high-power electron cyclotron resonance (ECR) ion sources.

In detail, the vacuum chamber of the magnet has a minimal inner width of 60 mm by 60 mm allowing for broad beams to pass without losses. The ion travel distance inside the magnet was minimized by using a magnet bending radius of only 250 mm in order to keep space charge effects small but still achieve a reasonable solution for mass-to-charge analysis.

The special design of the vacuum chamber includes water-cooled copper plates alongside the ideal ion trajectory where ion beam components are dumped which are separated from the ion species of choice bent at exactly 90°. The copper plates are designed to dissipate heat from ion beams of up to 300 W. They can easily be removed and exchanged when worn-out.

Parameters

Magnet Parameters
bending radius of charged particle beam 250 mm
bending angle 90°
pole shoe angles at beam entry / exit 33°
pole shoe gap 80 mm
shape of pole shoe edges at beam entrance / exit approx. Rogowski
max. magnetic induction at ion trajectory 0.55 T
effective magnetic length 394 mm
General Parameters
dimensions (length x width x height) 480 mm x 530 mm x 320 mm
weight 370 kg (820 lbs)
magnet yoke shape H-type
coil material water cooled hollow conductor
number of turns 180 (2 coils, 90 turns each)
beam dump elements water cooled copper plates
beamline flanges DN 100 CF, other flange types available
beam dump insertion flanges DN 63 CF
alignment windows DN 35 CF
Infrastructural Requirements
vacuum conditions during operation suitable from 1e-10 mbar up to atmospheric pressure
magnet and beam dump cooling type water cooling, 1.5 l / min at 3 bar each
proposed power supply 60 V / 200 A

Scope of Delivery

  • magnet yoke
  • water cooled coils incl. connectors for attachment of water hoses
  • vacuum chamber incl. water cooled copper plates for high-current ion beam power absorption

Optional Equipment

  • power supplies for operation of the magnet incl. tailored cables
  • support stand for the magnet incl. space to build in the magnet power supplies
  • electrical insulation to allow setting the vacuum chamber (as part of a customer beam line) on high voltage while magnet and power supplies remain on ground potential
  • water flow meter to guarantee sufficient water cooling
  • hall probe set to measure magnetic induction between the poles

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