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Magnetic emittance suppression using a bucking coil for a dc photocathode electron gun

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3 Author(s)
Nagai, Ryoji ; Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319–1195, Japan ; Hajima, Ryoichi ; Nishimori, Nobuyuki

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Magnetic emittance suppression was demonstrated using a bucking coil for a dc photocathode electron gun. The magnetic emittance is derived from a leakage magnetic field on the cathode surface originating from a solenoid lens, and is important for realizing a high brightness dc photocathode electron gun. In order to solve this problem, a bucking coil integrated solenoid lens has been developed. The solenoid lens consists of a main coil, a bucking coil, and a pure iron yoke. The bucking coil and the main coil are integrated in the same yoke in order to prevent distortion of the magnetic field due to misalignment of the two coils. The emittance was measured and calculated as a function of the exciting current of the bucking coil and as a function of the electron beam size on the cathode.

Published in:

Review of Scientific Instruments  (Volume:83 ,  Issue: 12 )

Date of Publication:

Dec 2012

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