QMS in the Third Stability Zone with a Transverse Magnetic Field Applied

Syed, Sarfaraz U. A. H.; Sreekumar, J.; Gibson, John R.; Taylor, Stephen

doi:10.1007/s13361-011-0153-5

Cited by 5 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previously published experimental and theoretical results for QMF operating in stability zone 1 showed: the effect of a transverse magnetic field on the resolution of QMF, the effect of a static magnetic field on the ion trajectories and the effect of an axial magnetic field on the performance of a QMF . For QMF operating in stability zone 3, previous work had shown the effect of transverse magnetic field on resolution . In this paper, therefore, we present new experimental and simulation results explaining the performance of QMF operating in stability zones 1 and 3 under the influence of magnetic field in detail.…”

Section: Introductionmentioning

confidence: 82%

“…An option of introducing magnetic in all the three directions (B x , B y , B z ) , along the whole length of the mass filter, is also incorporated. The original model has been upgraded to provide: improved sensitivity (using a larger number of steps along the mass scale), to include large number of ions at each point on the mass scale and to simulate a QMF with a very large number of rf cycles.…”

Section: Softwarementioning

confidence: 99%

“…The effect of transverse magnetic field on the performance of a QMF operating at the upper tip of stability region 3 has been described in detail previously. Figure , reproduced from illustrates the effect of transverse magnetic field on the performance of a QMF operating at the upper tip of stability zone 3. Figure a shows the behavior of the resolution, measured at 10% peak height as a function of transverse magnetic field for two different values of U/V ratio, 104.81% (solid line) and 104.82% (dotted line).…”

Section: Quadrupole Mass Spectrometer In the Third Stability Zone Witmentioning

confidence: 99%

See 2 more Smart Citations

Quadrupole mass filter operation under the influence of magnetic field

2013

View full text Add to dashboard Cite

This work demonstrates resolution enhancement of a quadrupole mass filter (QMF) under the influence of a static magnetic field. Generally, QMF resolution can be improved by increasing the number of rf cycles an ion experiences when passing through the mass filter. In order to improve the resolution, the dimensions of the QMF or the operating parameters need to be changed. However, geometric modifications to improve performance increase the manufacturing cost and usually the size of the instrument. By applying a magnetic field, a low-cost, small footprint instrument with reduced power requirements can be realized. Significant improvement in QMF resolution was observed experimentally for certain magnetic field conditions, and these have been explained in terms of our theoretical model developed at the University of Liverpool. This model is capable of accurate simulation of spectra allowing the user to specify different values of mass spectrometer dimensions and applied input signals. The model predicts enhanced instrument resolution R>26,000 for a CO2 and N2 mixture with a 200-mm long mass filter operating in stability zone 3 via application of an axial magnetic field.

show abstract

Section: Introductionmentioning

confidence: 82%

Section: Softwarementioning

confidence: 99%

Section: Quadrupole Mass Spectrometer In the Third Stability Zone Witmentioning

confidence: 99%

See 1 more Smart Citation

Quadrupole mass filter operation under the influence of magnetic field

2013

View full text Add to dashboard Cite

show abstract

“…The application of a static axial magnetic field along the mass filter increases the resolution of a quadrupole mass filter with hyperbolic-shaped electrodes [17]. Quadrupole mass filter with hyperbolic electrodes operated in zone 3 of the Mathieu stability diagram could achieve the resolution of the low mass isotopes such as HT-D2, separated by 0.004125 u [18,19]. The implementation of RGA concerns a very wide application range.…”

Section: B the Chosen Mass Spectrometermentioning

confidence: 99%

On-Line Mass Spectrometry Measurement of Fission Gas Release From Nuclear Fuel Submitted to Thermal Transients

Guigues

Janulyte

Zerega

et al. 2016

IEEE Trans. Nucl. Sci.

View full text Add to dashboard Cite

The MERARG device-implemented at the LECA-STAR Hot Laboratory, at the CEA Cadarache-allows characterizing nuclear fuels with respect to the behaviour of fission gases during thermal transients representative of normal or off normal operating nuclear power plant conditions. The fuel is heated in order to extract a part or the total gas inventory it contains. Fission Gas Release (FGR) is actually recorded by mean of both on-line gamma spectrometry station and micro gas chromatography. These two devices monitor the quantity and kinetics of fission gas release rate. They only address 85 Kr radioactive isotope and the elemental quantification of Kr, Xe and He (with a relatively low detection limit in the latter case, typically 5-10 ppm). In order to better estimate the basic mechanisms that promote fission gas release from irradiated nuclear fuels, the CEA fuel study department decided to improve its experimental facility by modifying MERARG to extend the studies of gamma emitter fission gases to all gases (including Helium) with a complete isotopic distribution capability. To match these specifications, a Residual Gas Analyser (RGA) has been chosen as mass spectrometer. This paper presents a review of the main aspects of the qualification/calibration phase of the RGA type analyser. In particular, results recorded over three mass ranges 1-10 u, 80-90 u and 120-140 u in the two classical modes of MERARG, i.e. on-line and off-line measurements are discussed. Results obtained from a standard gas bottle show that the quantitative analysis at a few ppm levels can be achieved for all isotopes of Kr and Xe, as well as masses 2 and 4 u.

show abstract

Mapping the Stability Diagram of a Quadrupole Mass Spectrometer with a Static Transverse Magnetic Field Applied

Maher

Syed

Hughes

et al. 2013

J. Am. Soc. Mass Spectrom.

View full text Add to dashboard Cite

Previous experimental and theoretical work identified that the application of a static magnetic (B) field can improve the resolution of a quadrupole mass spectrometer (QMS) and this simple method of performance enhancement offers advantages for field deployment. Presented here are further data showing the effect of the transverse magnetic field upon the QMS performance. For the first time, the asymmetry in QMS operation with B x and B y is considered and explained in terms of operation in the fourth quadrant of the stability diagram. The results may be explained by considering the additional Lorentz force (v x B) experienced by the ion trajectories in each case. Using our numerical approach, we model not only the individual ion trajectories for a transverse B field applied in x and y but also the mass spectra and the effect of the magnetic field upon the stability diagram. Our theoretical findings, confirmed by experiment, show an improvement in resolution and ion transmission by application of magnetic field for certain operating conditions.

show abstract

QMS in the Third Stability Zone with a Transverse Magnetic Field Applied

Cited by 5 publications

References 20 publications

Quadrupole mass filter operation under the influence of magnetic field

Quadrupole mass filter operation under the influence of magnetic field

On-Line Mass Spectrometry Measurement of Fission Gas Release From Nuclear Fuel Submitted to Thermal Transients

Mapping the Stability Diagram of a Quadrupole Mass Spectrometer with a Static Transverse Magnetic Field Applied

Contact Info

Product

Resources

About