The Paul trap: A radiofrequency-quadrupole ion trap for precision studies

2012 ◽  
Vol 681 ◽  
pp. 94-100 ◽  
Author(s):  
N.D. Scielzo ◽  
G. Li ◽  
M.G. Sternberg ◽  
G. Savard ◽  
P.F. Bertone ◽  
...  
Keyword(s):  
Ion Trap ◽  
Paul Trap ◽  
Quadrupole Ion Trap ◽  
Radiofrequency Quadrupole

The rotating-saddle trap: a mechanical analogy to RF-electric-quadrupole ion trapping?

2002 ◽  
Vol 80 (12) ◽  
pp. 1433-1448 ◽  
Author(s):  
R I Thompson ◽  
T J Harmon ◽  
M G Ball
Keyword(s):  
Ion Trap ◽  
Paul Trap ◽  
Electric Quadrupole ◽  
Quadrupole Ion Trap ◽  
Ion Trapping ◽  
University Of Calgary ◽  
Mechanical Analogue ◽  
Technical Details ◽  
The University ◽  
Excellent Tool

The rotating-saddle potential ball-bearing trap has long been used as a mechanical analogue to explain the operating principles of the Paul-type RF-electric-quadrupole ion trap. This paper outlines the shortcomings of this analogy, as well as explaining how and why this system remains an excellent tool for explaining ion-trap operation. The basic theory of the operating principles of the rotating-saddle trap is provided, which, unlike the Paul Trap is analytically solvable in the friction-free regime. In addition, some extensions to this theory are presented to examine such effects as friction. These results are compared with the equivalent results for Paul-Trap theory, as well as to experimental results measured with a rotating-saddle trap constructed at the University of Calgary. The technical details of this trap, an excellent tool for either lecture demonstrations or teaching laboratory experiments, are also presented, as well as some comments on building such a trap. PACS Nos.: 45.50-j, 01.50Pa, 32.80Pj

scholarly journals A linear radiofrequency quadrupole ion trap for the cooling and bunching of radioactive ion beams

2002 ◽  
Vol 701 (1-4) ◽  
pp. 565-569 ◽  
Author(s):  
A. Kellerbauer ◽  
G. Bollen ◽  
J. Dilling ◽  
S. Henry ◽  
F. Herfurth ◽  
...  
Keyword(s):  
Ion Trap ◽  
Quadrupole Ion Trap ◽  
Ion Beams ◽  
Radioactive Ion Beams ◽  
Radiofrequency Quadrupole

scholarly journals Quadrupole Ion Trap Mass Spectrometer for Ice Giant Atmospheres Exploration

2021 ◽  
Vol 217 (1) ◽  
Author(s):  
J. Simcic ◽  
D. Nikolić ◽  
A. Belousov ◽  
D. Atkinson ◽  
C. Lee ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Ion Trap ◽  
Quadrupole Ion Trap ◽  
Atomic Mass ◽  
Charge Ratio ◽  
Inlet System ◽  
Mass Spectrometers ◽  
Ion Trap Mass Spectrometer ◽  
Entry Probe ◽  
Composition Measurements

AbstractTo date, a variety of different types of mass spectrometers have been utilized on missions to study the composition of atmospheres of solar system bodies, including Venus, Mars, Jupiter, Titan, the moon, and several comets. With the increasing interest in future small probe missions, mass spectrometers need to become even more versatile, lightweight, compact, and sensitive.For in situ exploration of ice giant atmospheres, the highest priority composition measurements are helium and the other noble gases, noble gas isotopes, including 3He/4He, and other key isotopes like D/H. Other important but lower priority composition measurements include abundances of volatiles C, N, S, and P; isotopes 13C/12C, 15N/14N, 18O/17O/16O; and disequilibrium species PH3, CO, AsH3, GeH4, and SiH4. Required measurement accuracies are largely defined by the accuracies achieved by the Galileo (Jupiter) probe Neutral Mass Spectrometer and Helium Abundance Detectors, and current measurement accuracies of solar abundances.An inherent challenge of planetary entry probe mass spectrometers is the introduction of material to be sampled (gas, solid, or liquid) into the instrument interior, which operates at a vacuum level. Atmospheric entry probe mass spectrometers typically require a specially designed sample inlet system, which ideally provides highly choked, nearly constant mass-flow intake over a large range of ambient pressures. An ice giant descent probe would have to operate for 1-2 hours over a range of atmospheric pressures, possibly covering 2 or more orders of magnitude, from the tropopause near 100 mbar to at least 10 bars, in an atmospheric layer of depth beneath the tropopause of about 120 km at Neptune and about 150 km at Uranus.The Jet Propulsion Laboratory’s Quadrupole Ion Trap Mass Spectrometer (QITMS) is being developed to achieve all of these requirements. A compact, wireless instrument with a mass of only 7.5 kg, and a volume of 7 liters (7U), the JPL QITMS is currently the smallest flight mass spectrometer available for possible use on planetary descent probes as well as small bodies, including comet landers and surface sample return missions. The QITMS is capable of making measurements of all required constituents in the mass range of 1–600 atomic mass units (u) at a typical speed of 50 mass spectra per second, with a sensitivity of up to $10^{13}$ 10 13  counts/mbar/sec and mass resolution of $m/\Delta m=18000$ m / Δ m = 18000 at m/q = 40. (Throughout this paper we use the unit of m/q = u/e for the mass-to-charge ratio, where atomic mass unit and elementary charge are $1~\text{u} = 1.66\times 10^{-27}~\text{kg}$ 1 u = 1.66 × 10 − 27 kg and $1\text{e} = 1.6\times 10^{-19}$ 1 e = 1.6 × 10 − 19 C, respectively.) The QITMS features a novel MEMS-based inlet system driven by a piezoelectric actuator that continuously regulates gas flow at inlet pressures of up to 100 bar.In this paper, we present an overview of the QITMS capabilities, including instrument design and characteristics of the inlet system, as well as the most recent results from laboratory measurements in different modes of operation, especially suitable for ice giant atmospheres exploration.

Axial ion motion within the quadrupole ion trap elucidated by dc pulse tomography

2000 ◽  
Vol 194 (2-3) ◽  
pp. 225-234 ◽  
Author(s):  
Carsten Weil ◽  
J.Mitchell Wells ◽  
H Wollnik ◽  
R.Graham Cooks
Keyword(s):  
Ion Trap ◽  
Quadrupole Ion Trap ◽  
Ion Motion

Stability of ion motion in the quadrupole ion trap driven by rectangular waveform voltages

2003 ◽  
Vol 230 (1) ◽  
pp. 65-70 ◽  
Author(s):  
Won-Wook Lee ◽  
Soon-Ki Min ◽  
Cha-Hwan Oh ◽  
Pill-Soo Kim ◽  
Seok-Ho Song ◽  
...  
Keyword(s):  
Ion Trap ◽  
Quadrupole Ion Trap ◽  
Ion Motion ◽  
Rectangular Waveform
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