Panofsky magnet for the beam extraction from the synchrotron using a fast Q-magnet and RF-knockout

The fast control of the beam spill extracted from a synchrotron is a key function for the spot scanning irradiation in cancer therapy application. The authors propose an extraction method which uses the quadruple field of fast response, as well as the RF-knockout. A Panofsky magnet was developed as...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2011-12, Vol.269 (24), p.2911-2914
Main Authors: Masubuchi, S., Nakanishi, T.
Format: Article
Language:English
Subjects:
Apertures
Beams (radiation)
Cancer therapy
Coils
Eddy currents
Extraction
Ferrite
Magnetic fields
Quadruple magnet
Synchrotron
Synchrotrons
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Summary:The fast control of the beam spill extracted from a synchrotron is a key function for the spot scanning irradiation in cancer therapy application. The authors propose an extraction method which uses the quadruple field of fast response, as well as the RF-knockout. A Panofsky magnet was developed as a quadruple magnet, with a frequency response of around 10 kHz. The Panofsky magnet has a rectangular beam aperture and plate coils attached to the pole face. A model magnet has been manufactured with ferrite, and static and dynamic magnetic fields were measured. From the measurement we observed that the effects of eddy current in the plate coils were large and the uniformity of the magnetic field gradient in the beam aperture was worse than ±5% with a plate thickness of 0.02 cm and a frequency of current of 10 kHz. For the future, in a detailed design the eddy current effects have to be taken into account.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2011.04.038