Full Content is available to subscribers

Subscribe/Learn More  >
Proceedings Article

Physics of high-intensity nanosecond electron source

[+] Author Affiliations
Alberto Herrera-Gomez, William E. Spicer

Stanford Univ. (USA)

Proc. SPIE 2022, Photodetectors and Power Meters, 51 (October 15, 1993); doi:10.1117/12.158588
Text Size: A A A
From Conference Volume 2022

  • Photodetectors and Power Meters
  • Kenneth J. Kaufmann
  • San Diego, CA | July 11, 1993

abstract

A new high intensity, short time electron source is now being used at the Stanford Lineal Accelerator Center (SLAC). By using a GaAs negative affinity semiconductor in the construction of the cathode, it was possible to fulfill the operation requirements, such as peak currents of tens of amperes, peak widths of the order of nanoseconds, hundreds of hours of operation stability, and electron spin polarization. The cathode is illuminated with high intensity laser pulses, and photoemitted electrons constitute the yield. Because of the high currents, some non-linear effects are present. Very noticeable is the so called Charge Limit (CL) effect, which consist of a limit on the total charge in each pulse, that is, the total bunch charge stops increasing as the light pulse total energy increases. In this paper we will explain the mechanism of the CL and how it is caused by the photovoltaic effect. The treatment is based on the Three Step model of photoemission. We will relate the CL to the characteristics of the surface and bulk of the semiconductor, such as doping, band bending, surface vacuum level, and density of surface states. We also discuss possible ways to prevent the CL to take place.

© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Alberto Herrera-Gomez and William E. Spicer
"Physics of high-intensity nanosecond electron source", Proc. SPIE 2022, Photodetectors and Power Meters, 51 (October 15, 1993); doi:10.1117/12.158588; http://dx.doi.org/10.1117/12.158588


Access This Proceeding
Sign in or Create a personal account to Buy this proceeding ($15 for members, $18 for non-members).

Figures

Tables

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Proceeding
Sign in or Create a personal account to Buy this proceeding ($15 for members, $18 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.