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Simple radio-frequency power source for ion guides and ion traps Ronald M. Jones
 

Summary: Simple radio-frequency power source for ion guides and ion traps
Ronald M. Jones
Department of Chemistry, University of Utah, Salt Lake City, Utah 84112
Dieter Gerlich
Institut fu¨r Physik, Technische Universita¨t, Chemnitz-Zwickau 09107, Germany
Scott L. Andersona)
Department of Chemistry, University of Utah, Salt Lake City, Utah 84112
Received 12 May 1997; accepted for publication 9 June 1997
A high power oscillator circuit, designed to power radio-frequency rf ion guides and traps, is
described. The rf circuit is directly coupled to the guide/trap electrodes, and no frequency or
impedance matching is required. The design provides precisely adjustable rf amplitudes from 50
to 600 V, either under manual or computer control. The operating frequency can be varied from 1
to 30 MHz to allow best trapping conditions for different ion mass ranges. Provisions are made
for balancing the rf amplitude to compensate for small load asymmetries. The rf can be switched off
and on under control of a transistor­transistor logic signal, and the rise and fall time for the rf
amplitude can be manually controlled from a few rf cycles to milliseconds. Provisions are made for
applying both direct current dc difference and dc float potentials to the ion guide. The design is
easily constructed from readily available parts. © 1997 American Institute of Physics.
S0034-6748 97 01809-1
I. INTRODUCTION

  

Source: Anderson, Scott L. - Department of Chemistry, University of Utah

 

Collections: Energy Storage, Conversion and Utilization; Materials Science; Chemistry