Paths of Charged Particles in Electric and Magnetic Fields

Bartky, W.; Dempster, A. J.

doi:10.1103/physrev.33.1019

Cited by 50 publications

(12 citation statements)

References 2 publications

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“…In order to remove the thermionic current, we are planning to install a Wien filter in our beam line. 12 Removing the thermionic current is an effective way to improve the trapping efficiency.…”

Section: B Preliminary Optimization Using Rb Ion Beammentioning

confidence: 99%

Radioactive ion beam transportation for the fundamental symmetry study with laser-trapped atoms

Arikawa

Ando

Aoki

et al. 2014

Review of Scientific Instruments

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The search for the violation of the fundamental symmetry in a radioactive atom is the promising candidate for precision tests of the standard model and its possible extensions. The subtle signal arising from the symmetry violation is enhanced in heavy atoms, such as a francium (Fr). To realize high precision measurements, a large amount of radioactive isotopes is required. The Fr is produced via a nuclear fusion reaction using a melted gold target with a (18)O primary beam at Cyclotron and Radioisotope Center, Tohoku University. The maximum extraction efficiency of the Fr ion was achieved at approximately 35%. The beam line consists of an electrostatic deflector, three electrostatic quadrupole triplets to the measurement area at 10 m away from the reaction point, and several beam diagnosis systems. We optimized parameters of the beam line.

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Section: B Preliminary Optimization Using Rb Ion Beammentioning

confidence: 99%

Radioactive ion beam transportation for the fundamental symmetry study with laser-trapped atoms

Arikawa

Ando

Aoki

et al. 2014

Review of Scientific Instruments

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“…These so-called dynamic tunes originated with the U.S. EPA and are specific to the analysis of groups of analytes called volatiles and semivolatiles in various matrices from drinking water to extracts from liquid pools and soil found at U.S. EPA Super Fund sites. These tunes are based on bromofluorobenzene (BFB) [24] and decafluorotriphenyl phosphine (DFTPP) [25]. Modern instruments have tune routines that use PFTBA or PFK to make adjustments so that when BFB or DFTPP is analyzed, the spectra meet the U.S. EPA tune require ments for specific methods.…”

Section: 8 T U N I N G T H E M a S S S P E C T R O M E T E Rmentioning

confidence: 99%

“…24 is an EI mass spectrum of PFTBA. The double-focusing mass spectrometer does not have a linear m/z scale because it operates at a constant resolving power rather than a constant resolution.…”

mentioning

confidence: 99%

Mass Spectrometry Instrumentation

Sparkman¹,

Penton²,

Kitson³

2011

Gas Chromatography and Mass Spectrometry: A Practical Guide

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“…In this design, the radial electric field of cylindrical symmetry is superimposed at right angles to the homogeneous magnetic field, and double focusing is achieved only with a special ratio of E/B. Bartky and Dempster [13] were the first to propose such an arrangement for the specific case of a homogeneous magnetic field placed perpendicular to a cylindrical condenser, with ions travelling through the crossed fields and focusing at a deflection angle of /ͱ2 rad (127.3°). Based on this design, Bondy and Popper [14] built a 127.3°superimposed ExB mass spectrometer having the detector and the ion source located at the field boundaries.…”

Section: Introductionmentioning

confidence: 99%

Sub-miniature ExB sector-field mass spectrometer

Diaz

Giese

Gentry

2001

J. Am. Soc. Mass Spectrom.

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A novel sub-miniature double-focusing sector-field mass spectrometer has been fabricated at the University of Minnesota using a combination of conventional machining methods and thin film patterning techniques typically used in the sensor technology industry. Its design is based on the mass separation capabilities of a 90°cylindrical crossed electric and magnetic sector-field analyzer with a 2-cm radius, which under proper conditions is able to effectively cancel the angular and chromatic dispersion of the ion beam, thus improving the resolving power of the instrument. Simulations using finite element analysis and computer modeling were employed to verify and optimize the performance of the proposed instrument before and during its fabrication. The prototype was able to attain a resolving power of 106 full-width at half-maximum (FWHM), a detection limit close to 10 parts per million, a dynamic range of 5 orders of magnitude and a mass range up to 103 Da. Its overall size, including the magnet assembly, is 3.5 cm wide, 6 cm long and 7.5 cm tall, it weighs 0.8 kg, and its power consumption was measured to be 2.5 W. The performance of the instrument was found to be comparable to that of commercial residual gas analyzers, at a fraction of the cost. All these characteristics make this miniature mass spectrometer suitable for portable and low-cost analytical instrumentation. A mong all the possible analytical instruments, few are more powerful and have a wider range of applications than mass spectrometers. Despite all their capabilities, traditional mass spectrometers do have several limitations. The major disadvantage of mass spectrometry as an analytical technique is the complexity of the instrumentation required and its associated cost. Although some special-purpose mass spectrometers are available with prices in the $5,000 range, as in the case of Residual Gas Analyzers (RGA), the typical cost of a general-purpose analytical mass spectrometer is $25,000 to $150,000 in the case of very high resolution instruments. The components, such as sample inlet, ion source, mass analyzer, detector housing, and vacuum envelope are typically manufactured by conventional machining techniques, assembled and aligned manually, and finally each one is individually tuned and calibrated to meet the manufacturer's product specification. Due to the number of independent pieces and the elaborate geometry of a typical instrument, the manufacturing process is not compatible with mass production techniques. Also, commercially available instruments require high vacuum systems to operate, and usually have high power requirements. Such requirements hinder the use of this powerful technique in applications that require a reliable, low-cost, small and portable analytical sensor, such as environmental sampling in situ.We began this research project with the belief that the complexity, and hence the cost of analytical mass spectrometry, can be drastically reduced, to permit this powerful technique to be used in applications where it has previously...

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Paths of Charged Particles in Electric and Magnetic Fields

Cited by 50 publications

References 2 publications

Radioactive ion beam transportation for the fundamental symmetry study with laser-trapped atoms

Radioactive ion beam transportation for the fundamental symmetry study with laser-trapped atoms

Mass Spectrometry Instrumentation

Sub-miniature ExB sector-field mass spectrometer

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