NDLI: Detailed photoemission modeling using the 3D finite-element PIC code MICHELLE

Content Provider	IEEE Xplore Digital Library
Author	Petillo, J.J. Jensen, K. Levush, B. Panagos, J.N.P.
Copyright Year	2007
Description	Author affiliation: SAIC, Burlington (Petillo, J.J.)
Abstract	Low emittance, high current density sources are required to achieve the small beam size needed for high frequency vacuum electronic devices and for high power free electron lasers (FELs). Emission models are of particular importance in the emittance-dominated regime, where emission non-uniformity and surface structure of the cathode can have an impact on beam characteristics. We have been developing comprehensive time-dependent photoemission models for the simulation codes that account for laser and cathode material and surface characteristics. MICHELLE* is NRLs finite-element self-consistent electrostatic time- domain code: it has the ability to import an RF field, and has unique capabilities for modeling the emission and the self fields, near the cathode. In particular, some instances of surface irregularities and emission non-uniformity (due to work function variation) leading to such effects as beam emittance and high frequency oscillations are possible to model due to the code's conformal meshing capabilities. We will present results of the implementation of the 'next generation' photoemission models in the MICHELLE code for modeling surface roughness and non-uniformity.
Starting Page	904
Ending Page	904
File Size	50708
Page Count	1
File Format	PDF
ISBN	9781424409167
DOI	10.1109/PAC.2007.4440755
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Photoelectricity Finite element methods Surface emitting lasers Cathodes Laser beams Frequency Free electron lasers Laser modes Current density Electron beams
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Electrostatic time-domain PIC simulations of RF density-modulated electron sources with MICHELLE

Time-dependent models of field-assisted photoemission

New and Improved Emission Models in the Finite-Element Gun Code MICHELLE

Scanning Photoemission Microscopy of Photo-cathode Surfaces

Relativistic acceleration and retardation effects on photoemission of intense electron short pulses, in RF-FEL photoinjectors

Experimental Validation of a Photoemission Model for End-to-End Beam Simulations and Custom Photocathode Designs

Current capabilities of the Finite-Element MICHELLE gun & collector simulation code

Development of Advanced Models for 3D Photocathode PIC Simulations

Application of a general electron emission equation to surface non-uniformity and current density variation

Detailed photoemission modeling using the 3D finite-element PIC code MICHELLE

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