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Title: Compact mass spectrometer for plasma discharge ion analysis

A mass spectrometer and methods for mass spectrometry which are useful in characterizing a plasma. This mass spectrometer for determining type and quantity of ions present in a plasma is simple, compact, and inexpensive. It accomplishes mass analysis in a single step, rather than the usual two-step process comprised of ion extraction followed by mass filtering. Ions are captured by a measuring element placed in a plasma and accelerated by a known applied voltage. Captured ions are bent into near-circular orbits by a magnetic field such that they strike a collector, producing an electric current. Ion orbits vary with applied voltage and proton mass ratio of the ions, so that ion species may be identified. Current flow provides an indication of quantity of ions striking the collector.
Inventors:
 [1]
  1. (Los Alamos, NM)
Issue Date:
OSTI Identifier:
871061
Assignee:
Regents of University of California (Los Alamos, NM) LANL
Patent Number(s):
US 5650618
Contract Number:
W-7405-ENG-36
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Country of Publication:
United States
Language:
English
Subject:
compact; mass; spectrometer; plasma; discharge; analysis; methods; spectrometry; useful; characterizing; determining; type; quantity; simple; inexpensive; accomplishes; single; step; two-step; process; comprised; extraction; followed; filtering; captured; measuring; element; placed; accelerated; applied; voltage; bent; near-circular; orbits; magnetic; field; strike; collector; producing; electric; current; vary; proton; ratio; species; identified; flow; provides; indication; striking; mass filter; single step; plasma discharge; electric current; mass spectrometer; magnetic field; current flow; mass spectrometry; applied voltage; two-step process; step process; flow provides; mass analysis; element placed; /250/