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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/44118
Record Status
Checked
Record Id
44118
Title
Thermal emittance measurements from negative electron affinity photocathodes
Contributors
IV Bazarov (Cornell U.)
,
BM Dunham (Cornell U.)
,
F Hannon (Lancaster U.)
,
Y Li (Cornell U.)
,
X Liu (Cornell U.)
,
T Miyajima (Cornell U.)
,
DG Ouzounov (Cornell U.)
,
CK Sinclair (Cornell U.)
Abstract
Recent computational optimizations have demonstrated that it should be possible to construct electron injectors based on photoemission cathodes in very high voltage DC electron guns in which the beam emittance is dominated by the thermal emittance from the cathode. Negative electron affinity (NEA) photocathodes are known to have a naturally low thermal emittance. However, the thermal emittance depends on the illuminating wavelength, the degree of negative affinity, and the band structure of the photocathode material. As part of the development of a high brightness, high average current photoemission electron gun for the injector of an ERL light source, we have measured the thermal emittance from negative affinity GaAs and GaAsP photocathodes. The measurements were made by obtaining the electron beam spot size downstream of a counter-wound solenoid lens as a function of the lens strength. Electron beam spot sizes were measured by two techniques: a 20 μm wire scanner, and a BeO screen. Excellent agreement in measured emittance has been obtained between these two methods and direct transverse phase space mapping using a 20 μm slit and the screen. Results are presented for both cathode types. The Cornell ERL injector performance is evaluated based on the results of these measurements.
Organisation
CCLRC
,
CI
Keywords
physics
Funding Information
Related Research Object(s):
34175447
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Preprint
CI Preprints
Cockcroft 07-50 2007. Submitted to: Particle Accelerator Conference 2007 (PAC07), Albuquerque, New Mexico, USA, 25-29 Jun 2007
Cockcroft-07-50.pdf
2007
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