Download John`s AMS Instrument Developoment

Performance Upgrades
• High throughput lens, designed, needs to be
built, requires V301
• Converging inlet, tested to increase transmission
of larger particles
• Conversion dynode, tested Balzers SEV218,
mass bias eliminated, but ion collection
efficiency reduced.
• Restek (glass) coating on detection cylinder,
implemented, not yet quantified, may reduce
water and organic background.
Upgrade Plots Summary
• Converging Nozzle Plot
• Essentially a cone to channel larger
particles
• Conversion dynode plot SI vs. Ion mass
• ETP has mass bias, esp. above 100 amu,
but SEM218 doesn’t
• Approaching ng m-3 detection limits but IE
10-5 may be the limit (max)
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