Ongoing Measurements of Univesity of Bern Neutralizer in support of IBEX

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Ongoing Measurements of Univesity of Bern
Neutralizer in support of IBEX

• Peter Wurz, Lukas Saul, Juergen Scheer, Georg
  Bodmer

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Surface Neutralizer for low energy neutral beam
production

• RECENT DEVELOPMENTS
• New ESA for energy characterization
• IBEX-LO Spare surface installed
• New beam restrictor
• In Progress Independent MCP Calibration

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Calibration of Absolute Beam Flux
Relies on MCP efficiency calibration
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MCP efficiencies from Stephen Peko 2000
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Preliminary results of Energy Analysis

• Oxygen energy loss on Tungsten is constant with
  energy at 20
• Neutral Oxygen also converted to Positive at 1
  level
• Low energy tail fits very well to Exponentially
  Modified Gaussian
• Next round CVD diamond measurements

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Compare to LO measurements of energy loss on CV
diamond
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Prelimary measurements of Ionization Efficiency
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Beam Restrictor for Angular Analysis and improved
response range
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Collimator Effect
(wide ion beam aperture)
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