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Title: Mapping photocathode quantum efficiency with ghost imaging

Abstract

Measuring the quantum efficiency (QE) map of a photocathode injector typically requires laser scanning, an invasive operation that involves modifying the injector laser focus and rastering the focused laser spot across the photocathode surface. Raster scanning interrupts normal operation and takes considerable time to setup. In this paper, we demonstrate a novel method of measuring the QE map using a ghost imaging framework that correlates the injector laser spatial variation over time with the total charge yield. Ghost imaging enables passive, real-time monitoring of the QE map without manually modifying the injector laser or interrupting injector operation. We first demonstrate the method at the UCLA Pegasus photoinjector with the help of a digital micromirror device (DMD) and a piezoelectric mirror to increase our control of the overall transverse variance of the illumination profile. The reconstruction algorithm parameters are fine-tuned using simulations and the results are validated against the ground truth map acquired using the traditional rastering method. Finally, we apply the technique to data acquired parasitically from the LCLS photoinjector, showing the feasibility of this method to retrieve a QE map without interrupting normal operation.

Authors:
ORCiD logo; ORCiD logo; ORCiD logo; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1599524
Alternate Identifier(s):
OSTI ID: 1604896
Grant/Contract Number:  
AC02-76SF00515; DMR-1548924
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 23 Journal Issue: 2; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Kabra, K., Li, S., Cropp, F., Lane, Thomas J., Musumeci, P., and Ratner, D. Mapping photocathode quantum efficiency with ghost imaging. United States: N. p., 2020. Web. doi:10.1103/PhysRevAccelBeams.23.022803.
Kabra, K., Li, S., Cropp, F., Lane, Thomas J., Musumeci, P., & Ratner, D. Mapping photocathode quantum efficiency with ghost imaging. United States. doi:10.1103/PhysRevAccelBeams.23.022803.
Kabra, K., Li, S., Cropp, F., Lane, Thomas J., Musumeci, P., and Ratner, D. Wed . "Mapping photocathode quantum efficiency with ghost imaging". United States. doi:10.1103/PhysRevAccelBeams.23.022803.
@article{osti_1599524,
title = {Mapping photocathode quantum efficiency with ghost imaging},
author = {Kabra, K. and Li, S. and Cropp, F. and Lane, Thomas J. and Musumeci, P. and Ratner, D.},
abstractNote = {Measuring the quantum efficiency (QE) map of a photocathode injector typically requires laser scanning, an invasive operation that involves modifying the injector laser focus and rastering the focused laser spot across the photocathode surface. Raster scanning interrupts normal operation and takes considerable time to setup. In this paper, we demonstrate a novel method of measuring the QE map using a ghost imaging framework that correlates the injector laser spatial variation over time with the total charge yield. Ghost imaging enables passive, real-time monitoring of the QE map without manually modifying the injector laser or interrupting injector operation. We first demonstrate the method at the UCLA Pegasus photoinjector with the help of a digital micromirror device (DMD) and a piezoelectric mirror to increase our control of the overall transverse variance of the illumination profile. The reconstruction algorithm parameters are fine-tuned using simulations and the results are validated against the ground truth map acquired using the traditional rastering method. Finally, we apply the technique to data acquired parasitically from the LCLS photoinjector, showing the feasibility of this method to retrieve a QE map without interrupting normal operation.},
doi = {10.1103/PhysRevAccelBeams.23.022803},
journal = {Physical Review Accelerators and Beams},
number = 2,
volume = 23,
place = {United States},
year = {2020},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.23.022803

Citation Metrics:
Cited by: 1 work
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