A transverse emittance and acceptance measurement system in a low-energy beam transport line

A transverse beam emittance and acceptance measurement system has been developed to visualize the relationship between the injected beam emittance and the acceptance of a cyclotron. The system is composed of a steering magnet, two pairs of slits to limit the horizontal and vertical phase-space, a be...

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Bibliographic Details
Published in:Review of scientific instruments 2014-02, Vol.85 (2), p.02A735
Main Authors: Kashiwagi, H, Miyawaki, N, Kurashima, S, Okumura, S
Format: Article
Language:English
Subjects:
BEAM EMITTANCE
BEAM INJECTION
BEAM TRANSPORT
CYCLOTRONS
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ION BEAMS
KEV RANGE
MAGNETS
OXYGEN 16
PARTICLE ACCELERATORS
PHASE SPACE
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Summary:A transverse beam emittance and acceptance measurement system has been developed to visualize the relationship between the injected beam emittance and the acceptance of a cyclotron. The system is composed of a steering magnet, two pairs of slits to limit the horizontal and vertical phase-space, a beam intensity detector just behind the slits for the emittance measurement, and a beam intensity detector in the cyclotron for the acceptance measurement. The emittance is obtained by scanning the slits and measuring the beam intensity distribution. The acceptance is obtained by measuring the distribution of relative beam transmission by injecting small emittance beams at various positions in a transverse phase-space using the slits. In the acceptance measurement, the beam from an ion source is deflected to the defined region by the slits using the steering magnet so that measurable acceptance area covers a region outside the injection beam emittance. Measurement tests were carried out under the condition of accelerating a beam of (16)O(6+) from 50.2 keV to 160 MeV. The emittance of the injected beam and the acceptance for accelerating and transporting the beam to the entrance of the extraction deflector were successfully measured. The relationship between the emittance and acceptance is visualized by displaying the results in the same phase-plane.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4858175