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Shaped Beams from Diamond Field-Emitter Array Cathodes

Journal Article · · IEEE Transactions on Plasma Science
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Euclid TechLabs LL, Bolingbrook, IL (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
  4. Illinois Inst. of Technology (IIT), Chicago, IL (United States)
+ Show Author Affiliations

Diamond field-emitter arrays (DFEAs) are arrays of diamond pyramids with exquisitely sharp tips and micrometerscale bases that produce high current densities. These arrays can be fabricated in arbitrary shapes, ranging from single tips to many millions of tips, so that they produce an inherently shaped electron beam. Each tip emits a modest current, but the large dense array can produce many Amps. We are investigating these cathodes for use in dielectric wakefield accelerators; however, they may also be applicable to vacuum microwave tubes. Recently, shaped beam production and transport have been demonstrated in the 1.3-GHz RF gun at the Argonne Cathode Test Stand at the Argonne National Laboratory. The charge was measured on a Faraday cup and the beam imaged on a YAG screen with peak electric field gradients on the cathode ranging from 12 to 35 MV/m. Three cathode geometries were tested: one 1-mm equilateral triangle with 7-μm base pyramids and 10-μm pitch, one 1-mm equilateral triangle with 10-μm base and 25-μm pitch, and one sparse 5 × 5 square array with 20-μm base and 400-μm pitch. The two triangular arrays emitted 35 nC in an RF macropulse at 35 MV/m and 13-nC charge at 27 MV/m, respectively, while the sparse array emitted 0.060-nC charge at 15 MV/m. This article presents the results of the triangular array experiments, including damage due to breakdown in the RF gun and initial models of tip-to-tip shielding.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
LDRD
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1716796
Alternate ID(s):
OSTI ID: 1530753
OSTI ID: 1765684
Report Number(s):
LA-UR--19-31870
Journal Information:
IEEE Transactions on Plasma Science, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 7 Vol. 48; ISSN 0093-3813
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Accelerator design, technology, and operations
RF-gun
UNCD
diamond
field-emission
patterned beam
shaped beam
shielding