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

Ryoji Nagai, Ryoichi Hajima, Nobuyuki Nishimori

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number123303
JournalReview of Scientific Instruments
Volume83
Issue number12
DOIs
Publication statusPublished - 2012 Dec 1

ASJC Scopus subject areas

  • Instrumentation

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