Intensity distributions of reflected surface channeling protons scattered on surfaces of electron-bombarded alkali halide crystals

Fukazawa, Yuuko; Kihara, K.; Iwamoto, K.; Susuki, Yasufumi

doi:10.1016/j.nimb.2013.04.088

Cited by 3 publications

(5 citation statements)

References 12 publications

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“…The convenience our system provides is the use of a ‰uorescent screen to observe the scattering patterns and a commercial digital camera to obtain yield measurements. In this experiment using keV proton beam, the beam current is very stable as compared with that of sub-MeV proton beam from an accelerator 12,13) . This can be attributed to small beam losses during transport in this system.…”

Section: Resultsmentioning

confidence: 94%

“…At the entrance of the UHV chamber, the electron beam was collimated by a 1.5×10 mm 2 slit and horizontally scanned by a 260-Hz magneticˆeld. The electron beam was also scanned vertically by another 22-Hz magnetiĉ eld to produce uniform irradiation (modulated line scan) 12,13) . The electron beam in front of the sample was spread over 30×30 mm 2 by the scanning magneticˆelds.…”

Section: Preparation Of the Experimental Apparatusmentioning

confidence: 99%

“…The intensity distributions of the scattered patterns were obtained from B values of the RGB color values of the images. It required 13 min to take each distribution set for the irradiation ‰uence 12,13) . Since the numbers of the incident particle to MCP were large compared with the counting rates of MCP that are generally used as particle detection measurements, the bias voltage to the MCP was suppressed.…”

Section: Preparation Of the Experimental Apparatusmentioning

confidence: 99%

“…The damping oscillations have also been shown for typical situations but not shown as a systematic compilation. We recently measured re‰ected protons at electronbombarded KBr(001) surfaces with grazing incidence and have observed specular oscillations by the layer-bylayer desorption 12,13) . In previous works we used 550 keV protons from an accelerator.…”

Section: Introductionmentioning

confidence: 99%

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Detection System for KeV Proton Beam Scattered from an ESD-surface with Monolayer Pits of Alkali Halide Crystal

2017

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To observe specular oscillations in ion-surface scattering originating from layer-by-layer desorption of an electron stimulated desorbed (ESD) surface, a 15 keV proton beam was impinged on the surface with an angle of incidence less than 1°. We prepared an experimental system to examine the scattering yields of re‰ecting protons by conveniently employing a ‰uorescent screen to view scattering yields (scattering patterns) and a commercial digital camera for yield measurements. Because the present energy of the proton beam was too low to illuminate the screen, a micro-channel plate was inserted in front of the screen. Measurements with electron irradiation show obvious damping specular oscillations; the widths of angular distributions of scattered protons simultaneously oscillated with increasing electron ‰uence. From the measured periods of the oscillations, the ESD rates of thermal desorption from KBr(001) at 1.5 keV electrons irradiation were obtained for sample temperatures.

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Section: Resultsmentioning

confidence: 94%

Section: Preparation Of the Experimental Apparatusmentioning

confidence: 99%

Section: Preparation Of the Experimental Apparatusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Detection System for KeV Proton Beam Scattered from an ESD-surface with Monolayer Pits of Alkali Halide Crystal

2017

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“…We have previously studied the surface morphologies of electron-irradiated alkali halides via surface channeling of MeV proton beams [1][2][3][4] . To investigate the surface morphologies of various sample species, we employed a keV-proton beam using a facile apparatus.…”

Section: Introductionmentioning

confidence: 99%

A Simple Image Intensifier Prepared for the Transport of Nano-Ampere keV Ion Beams

2015

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We introduce our handmade image intensiˆer for visualizing the beam proˆles of accelerated ion beams having energy and current in the order of keV and nano-amperes, respectively. The simple image intensiˆer comprising stainless steel meshes and a ‰uorescent screen has been designed for the transport of mm-size ion beams. The intensiˆer is easy to install in the beamline of a vacuum setup, because it is designed to attach on a con‰at ‰ange of ICF70. We have used the image intensiˆer to observe the beam proˆles of the ion beams transported from the ion source to an ultra-high vacuum chamber. Through the use of the image intensiˆer, bright images were obtained, and it was concluded that the intensiˆer is useful for observing the proˆles of the beams having current densities greater than 0.1 nA mm-2 .

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Oscillating behavior of proton scattering amplitude on an electron-stimulated-desorbed surface of KBr by keV electrons

Fukazawa

Tasaki

Susuki

2020

Nuclear Instruments and Methods in Physics Research Section B:

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Intensity distributions of reflected surface channeling protons scattered on surfaces of electron-bombarded alkali halide crystals

Cited by 3 publications

References 12 publications

Detection System for KeV Proton Beam Scattered from an ESD-surface with Monolayer Pits of Alkali Halide Crystal

Detection System for KeV Proton Beam Scattered from an ESD-surface with Monolayer Pits of Alkali Halide Crystal

A Simple Image Intensifier Prepared for the Transport of Nano-Ampere keV Ion Beams

Oscillating behavior of proton scattering amplitude on an electron-stimulated-desorbed surface of KBr by keV electrons

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