skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Demonstration Of Fast, Single-Shot Photocathode QE Mapping Method Using Mla Pattern Beam

Abstract

Quantum efficiency (QE) is the chief figure of merit in the characterization of photocathodes. Semiconductor photocathodes, especially when used in high rep-rate photoinjectors, are known to show QE degradation over time and must be replaced. The totalQE is the basic diagnosticwhich is used widely and is easy to obtain. However, a QE map indicating variations of QE across the cathode surface has greater utility. It can quickly diagnose problems of QE inhomogeneity. Most QE mapping techniques require hours to complete and are thus disruptive to a user facility schedule. A fast, single-shot method has been proposed using a micro-lens array (MLA) generated QE map. In this paper we report the implementation of the method at Argonne Wakefield Accelerator facility. A micro-lens array (MLA) is used to project an array of beamlets onto the photocathode. The resulting photoelectron beam in the form of an array of electron beamlets is imaged at a YAG screen. Four synchronized measurements are made and the results used to produce a QE map of the photocathode.

Authors:
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [4];  [5];  [5]
  1. IIT, Chicago
  2. Argonne
  3. Beijing U. of Tech.
  4. Pohang Accelerator Lab.
  5. NIU, DeKalb
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1452805
Report Number(s):
FERMILAB-CONF-18-160-AD-APC
1677251
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: 9th International Particle Accelerator Conference, Vancouver, BC Canada, 04/29-05/04/2018
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Wisniewski, E. E., Conde, M., Doran, D. S., Gai, W., Jing, C., Liu, W., Power, J. G., Whiteford, C., Gao, Q., Ha, G., Halavanau, A., and Piot, P. Demonstration Of Fast, Single-Shot Photocathode QE Mapping Method Using Mla Pattern Beam. United States: N. p., 2018. Web.
Wisniewski, E. E., Conde, M., Doran, D. S., Gai, W., Jing, C., Liu, W., Power, J. G., Whiteford, C., Gao, Q., Ha, G., Halavanau, A., & Piot, P. Demonstration Of Fast, Single-Shot Photocathode QE Mapping Method Using Mla Pattern Beam. United States.
Wisniewski, E. E., Conde, M., Doran, D. S., Gai, W., Jing, C., Liu, W., Power, J. G., Whiteford, C., Gao, Q., Ha, G., Halavanau, A., and Piot, P. Sun . "Demonstration Of Fast, Single-Shot Photocathode QE Mapping Method Using Mla Pattern Beam". United States. https://www.osti.gov/servlets/purl/1452805.
@article{osti_1452805,
title = {Demonstration Of Fast, Single-Shot Photocathode QE Mapping Method Using Mla Pattern Beam},
author = {Wisniewski, E. E. and Conde, M. and Doran, D. S. and Gai, W. and Jing, C. and Liu, W. and Power, J. G. and Whiteford, C. and Gao, Q. and Ha, G. and Halavanau, A. and Piot, P.},
abstractNote = {Quantum efficiency (QE) is the chief figure of merit in the characterization of photocathodes. Semiconductor photocathodes, especially when used in high rep-rate photoinjectors, are known to show QE degradation over time and must be replaced. The totalQE is the basic diagnosticwhich is used widely and is easy to obtain. However, a QE map indicating variations of QE across the cathode surface has greater utility. It can quickly diagnose problems of QE inhomogeneity. Most QE mapping techniques require hours to complete and are thus disruptive to a user facility schedule. A fast, single-shot method has been proposed using a micro-lens array (MLA) generated QE map. In this paper we report the implementation of the method at Argonne Wakefield Accelerator facility. A micro-lens array (MLA) is used to project an array of beamlets onto the photocathode. The resulting photoelectron beam in the form of an array of electron beamlets is imaged at a YAG screen. Four synchronized measurements are made and the results used to produce a QE map of the photocathode.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {4}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: