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

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

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...

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Veröffentlicht in:Review of scientific instruments 2012-12, Vol.83 (12), p.123303-123303
Hauptverfasser: Nagai, Ryoji, Hajima, Ryoichi, Nishimori, Nobuyuki
Format: Artikel
Sprache:eng
Schlagworte:
Coiling
Direct current
Emittance
Lenses
Magnetic fields
Photocathodes
Solenoids
Yokes
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container_end_page 123303
container_issue 12
container_start_page 123303
container_title Review of scientific instruments
container_volume 83
creator Nagai, Ryoji
Hajima, Ryoichi
Nishimori, Nobuyuki
description 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.
doi_str_mv 10.1063/1.4772397
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source AIP Journals Complete; AIP Digital Archive; Alma/SFX Local Collection
subjects Coiling
Direct current
Emittance
Lenses
Magnetic fields
Photocathodes
Solenoids
Yokes
title Magnetic emittance suppression using a bucking coil for a dc photocathode electron gun
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