Formation of Helium Ion Beams by the Injection of a Neutral Helium Beam into a Tandem Accelerator

1961 ◽  
Vol 32 (5) ◽  
pp. 568-571 ◽  
Author(s):  
P. H. Rose ◽  
A. B. Wittkower ◽  
R. P. Bastide ◽  
A. J. Gale
Keyword(s):  
Ion Beams ◽  
Tandem Accelerator ◽  
Helium Ion

scholarly journals Accelerated helium-ion beams for radiotherapy and stereotactic radiosurgery

1991 ◽  
Vol 18 (1) ◽  
pp. 36-42 ◽  
Author(s):  
Bernhard A. Ludewigt ◽  
William T. Chu ◽  
Mark H. Phillips ◽  
Timothy R. Renner
Keyword(s):  
Stereotactic Radiosurgery ◽  
Ion Beams ◽  
Helium Ion

scholarly journals Ion beam profiling from the interaction with a freestanding 2D layer

2017 ◽  
Vol 8 ◽  
pp. 682-687 ◽  
Author(s):  
Ivan Shorubalko ◽  
Kyoungjun Choi ◽  
Michael Stiefel ◽  
Hyung Gyu Park
Keyword(s):  
Focused Ion Beam ◽  
Ion Beam ◽  
Beam Current ◽  
Exposure Dose ◽  
Ion Beams ◽  
Gaussian Profile ◽  
Helium Ion ◽  
Spread Function ◽  
Sputtering Yields ◽  
Pattern Resolution

Recent years have seen a great potential of the focused ion beam (FIB) technology for the nanometer-scale patterning of a freestanding two-dimensional (2D) layer. Experimentally determined sputtering yields of the perforation process can be quantitatively explained using the binary collision theory. The main peculiarity of the interaction between the ion beams and the suspended 2D material lies in the absence of collision cascades, featured by no interaction volume. Thus, the patterning resolution is directly set by the beam diameters. Here, we demonstrate pattern resolution beyond the beam size and precise profiling of the focused ion beams. We find out that FIB exposure time of individual pixels can influence the resultant pore diameter. In return, the pore dimension as a function of the exposure dose brings out the ion beam profiles. Using this method of determining an ion-beam point spread function, we verify a Gaussian profile of focused gallium ion beams. Graphene sputtering yield is extracted from the normalization of the measured Gaussian profiles, given a total beam current. Interestingly, profiling of unbeknown helium ion beams in this way results in asymmetry of the profile. Even triangular beam shapes are observed at certain helium FIB conditions, possibly attributable to the trimer nature of the beam source. Our method of profiling ion beams with 2D-layer perforation provides more information on ion beam profiles than the conventional sharp-edge scan method does.

Radiolysis of aqueous solutions with pulsed helium ion beams—2. Yield of SO4− formed by scavenging hydrated electron as a function of S2O2−8 concentration

1999 ◽  
Vol 54 (4) ◽  
pp. 385-391 ◽  
Author(s):  
Norihisa Chitose ◽  
Yosuke Katsumura ◽  
Masafumi Domae ◽  
Zhihua Zuo ◽  
Takeshi Murakami
Keyword(s):  
Aqueous Solutions ◽  
Ion Beams ◽  
Hydrated Electron ◽  
Helium Ion

scholarly journals A novel method for assessment of nuclear interactions of therapeutic helium-ion beams using the Timepix detector

2016 ◽  
Vol 118 ◽  
pp. S45 ◽  
Author(s):  
R. Gallas ◽  
G. Arico ◽  
T. Gehrke ◽  
O. Jäkel ◽  
M. Martisikova
Keyword(s):  
Ion Beams ◽  
Helium Ion ◽  
Nuclear Interactions ◽  
Novel Method

scholarly journals Energy Loss of Hydrogen- and Helium-Ion Beams in DNA: Calculations Based on a Realistic Energy-Loss Function of the Target

2011 ◽  
Vol 175 (2) ◽  
pp. 247-255 ◽  
Author(s):  
Isabel Abril ◽  
Rafael Garcia-Molina ◽  
Cristian D. Denton ◽  
Ioanna Kyriakou ◽  
Dimitris Emfietzoglou
Keyword(s):  
Energy Loss ◽  
Loss Function ◽  
Ion Beams ◽  
Energy Loss Function ◽  
Helium Ion

Microbeam system at the Wakasa Wan Energy Research Center

2015 ◽  
Vol 25 (03n04) ◽  
pp. 227-233 ◽  
Author(s):  
Keisuke Yasuda
Keyword(s):  
Quadrupole Doublet ◽  
Ion Beams ◽  
Research Center ◽  
Tea Leaves ◽  
Energy Research ◽  
Tandem Accelerator ◽  
Magnetic Quadrupole

A microbeam system at the Wakasa Wan Energy Research Center is presented. A magnetic quadrupole doublet is used for the focusing of ion beams from a 5 MV tandem accelerator. Micro-PIXE and micro-PIGE measurements both in the vacuum and air are applicable with this system. Examples of the measurements for tooth and tea leaves are also presented.

Radiolysis of aqueous solutions with pulsed helium ion beams Yield of (SCN)2-formed by scavenging OH as a function of SCN-concentration

1997 ◽  
Vol 93 (22) ◽  
pp. 3939-3944 ◽  
Author(s):  
Norihisa Chitose ◽  
Yosuke Katsumura ◽  
Zhihua Zuo ◽  
Masafumi Domae ◽  
Kenkichi Ishigure ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Ion Beams ◽  
Helium Ion

Radiolysis of Aqueous Solutions with Pulsed Helium Ion Beams. 3. Yields of OH Radicals and the Sum of eaq-and H Atom Yields Determined in Methyl Viologen Solutions Containing Formate

1999 ◽  
Vol 103 (24) ◽  
pp. 4769-4774 ◽  
Author(s):  
Norihisa Chitose ◽  
Yosuke Katsumura ◽  
Masafumi Domae ◽  
Zhihua Zuo ◽  
Takeshi Murakami ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Methyl Viologen ◽  
Ion Beams ◽  
Oh Radicals ◽  
Helium Ion
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