English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Optical fiber-based photocathode

Casandruc, A., Bücker, R., Kassier, G., & Miller, R. J. D. (2016). Optical fiber-based photocathode. Applied Physics Letters, 109(9): 091105. doi:10.1063/1.4962147.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-60CE-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-93C2-A
Genre: Journal Article

Files

show Files
hide Files
:
1.4962147.pdf (Publisher version), 777KB
Name:
1.4962147.pdf
Description:
-
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
2016
Copyright Info:
© the Author(s)
:
supplementary.pdf (Supplementary material), 478KB
Name:
supplementary.pdf
Description:
-
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
2016
Copyright Info:
© the Author(s)

Locators

show
hide
Locator:
http://dx.doi.org/10.1063/1.4962147 (Publisher version)
Description:
-

Creators

show
hide
 Creators:
Casandruc, Albert1, 2, Author              
Bücker, Robert1, 2, Author              
Kassier, Günther1, 2, Author              
Miller, R. J. Dwayne1, 2, 3, Author              
Affiliations:
1Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              
2Center for Free-Electron Laser Science (CFEL) and Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, Hamburg 22761, Germany, ou_persistent22              
3Departments of Chemistry and Physics, University of Toronto, Toronto, Ontario M5S 3H6, Canada, ou_persistent22              

Content

show
hide
Free keywords: Photocathodes; Electric measurements; Gold; Optical fiber testing; Optical coatings
 Abstract: We present the design of a back-illuminated photocathode for electron diffraction experiments based on an optical fiber, and experimental characterization of emitted electron bunches. Excitation light is guided through the fiber into the experimental vacuum chamber, eliminating typical alignment difficulties between the emitter metal and the optical trigger and position instabilities, as well as providing reliable control of the laser spot size and profile. The in-vacuum fiber end is polished and coated with a 30 nm gold (Au) layer on top of 3 nm of chromium (Cr), which emits electrons by means of single-photon photoemission when femtosecond pulses in the near ultraviolet (257 nm) are fed into the fiber on the air side. The emission area can be adjusted to any value between a few nanometers (using tapered fibers) and the size of a multi-mode fiber core (100 μm or larger). In this proof-of-principle experiment, two different types of fibers were tested, with emission spot diameters of 50 μm and 100 μm, respectively. The normalized thermal electron beam emittance (TE) was measured by means of the aperture scan technique, and a TE of 4.0 π nm was measured for the smaller spot diameter. Straightforward enhancements to the concept allowed to demonstrate operation in an electric field environment of up to 7 MV/m.

Details

show
hide
Language(s): eng - English
 Dates: 2016-06-112016-08-222016-09-022016-08-29
 Publication Status: Published in print
 Pages: 3
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1063/1.4962147
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Applied Physics Letters
  Abbreviation : Appl. Phys. Lett.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Melville, NY : American Institute of Physics
Pages: - Volume / Issue: 109 (9) Sequence Number: 091105 Start / End Page: - Identifier: Other: 0003-6951
CoNE: /journals/resource/954922836223