Design and characterization of a versatile Faraday cup

Journal Article · Mon Feb 01 04:00:00 EST 1993 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1144216· OSTI ID:6944897

Seamans, J F; Kimura, W D ^[1]

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1. STI Optronics, Inc., 2755 Northup Way, Bellevue, Washington 98004-1495 (United States)

The design and characterization of a Faraday cup utilizing modular components are presented. Design specifications were primarily tailored to satisfy the specific electron beam ([ital e]-beam) energy ([similar to]375 keV), rise time ([similar to]60 ns), and magnitude (30 A/cm[sup 2], peak) used in this work and permit convenient sampling of large [ital e]-beam areas up to 7 cm[times]7 cm. Characterization during evacuated conditions included [ital Z]-dependence measurements using beryllium, carbon, aluminum, and lead collector plates. Electron beam transmission measurements were made utilizing combinations of various metal screens and Kapton foils in both gas and evacuated conditions. Gas environments tested were air, krypton, and a Kr/Ar mixture. An attacher gas, SF[sub 6], was also added inside the Faraday cup. Results reveal decreasing current densities with increasing gas stopping power and increasing electron propagation distance in a gas. Employing a carbon collector plate and a 25-[mu]m Kapton foil insulator, current densities measured through a 3.6-cm thick 760 Torr air slab are reduced [le]6% from the evacuated Kapton-free condition. Applying profile and full-aperture Faraday cup measurements, a consistent description of the [ital e]-beam is also presented.

• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6944897
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 64:2; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

440800* -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
BEAM MONITORS
BEAMS
DESIGN
ELECTRON BEAMS
FARADAY CUPS
LASL
LEPTON BEAMS
MEASURING INSTRUMENTS
MONITORS
NATIONAL ORGANIZATIONS
OPERATION
PARTICLE BEAMS
US AEC
US DOE
US ERDA
US ORGANIZATIONS