scholarly journals Some initial results of simulating a positron beam system by using SIMION

2021 ◽  
Vol 7 (3) ◽  
pp. 17-24
Author(s):  
Thanh Long Cao ◽  
Trung Hieu Nguyen ◽  
Quoc Dung Tran ◽  
Dong Phuong Huynh
Keyword(s):  
Magnetic Field ◽  
Positron Beam ◽  
Material Research ◽  
Slow Positron ◽  
Beam Trajectory ◽  
Beam System ◽  
Simulation Results ◽  
Initial Results

Slow Positron Beam (PB) is an important device in the study of positron physics andtechniques, especially in material research. For the purpose of conceptual designing a PB system, we have simulated a PB system with the parameters of an existing system – SPONSOR, using SIMION software. The simulation results have been compared with the SPONSOR published results. The effect of magnetic field in controlling beam trajectory has been investigated in the preaccelerated and accelerated stages. The simulation results of using steering coils to adjust the beam trajectory are also presented in this report.

Slow Positron Beam with Small Energy Spread in the Magnetic Field Using Reflection Type Remoderator

1997 ◽  
Vol 255-257 ◽  
pp. 677-679 ◽  
Author(s):  
Yoshihide Honda ◽  
Masaki Maekawa ◽  
N. Kimura ◽  
T. Kozawa ◽  
S. Nishijima ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Positron Beam ◽  
Energy Spread ◽  
Small Energy ◽  
Slow Positron ◽  
The Magnetic Field

The Construction of Slow Positron Beam System in Kriss

1994 ◽  
Vol 175-178 ◽  
pp. 145-148
Author(s):  
Yang Koo Cho ◽  
Yong Il Kim ◽  
Chang Soo Kim
Keyword(s):  
Positron Beam ◽  
Slow Positron ◽  
Beam System

scholarly journals A total reflection high-energy positron diffraction station at the KEK-SPF

2014 ◽  
Vol 70 (a1) ◽  
pp. C1613-C1613
Author(s):  
Ken Wada ◽  
Masaki Maekawa ◽  
Yuki Fukaya ◽  
Izumi Mochizuki ◽  
Toshio Hyodo ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Large Diameter ◽  
Small Diameter ◽  
Positron Beam ◽  
High Energy ◽  
Total Reflection ◽  
Present System ◽  
Slow Positron ◽  
Reconstructed Surface ◽  
The Magnetic Field

A high-intensity mono-energetic positron beam generated by using a linear electron accelerator (linac) provides total reflection high-energy positron diffraction (TRHEPD) researches at Slow Positron Facility (SPF), KEK [1,2]. A pulsed 50-Hz electron beam generated with a dedicated linac (operated at 55 MeV, 0.6 kW) is injected on a Ta converter and causes fast positron-electron pair creation through bremsstrahlung. The positrons showering down on 25 μm-thick W foils, are moderated to thermal energy, and a fraction spontaneously comes out of the foils with an energy of 3 eV owing to the negative work function. The positron converter/moderator assembly is held at an electrostatic voltage of 15 kV for TRHEPD experiment. The emitted positrons are consequently accelerated to 15 keV as they enter the grounded beam-line and are guided by the magnetic field of about 0.015 T to the TRHEPD station. For diffraction experiments, positrons transported by the magnetic field have to be first released into a nonmagnetic region. Since the released positron beam has a large diameter, a brightness-enhancement unit is effectively used to achieve a small-diameter and highly-parallel beam with a sufficient flux. The linac-based positron beam gives about 60 times intensified diffraction pattern from a Si(111)-7x7 reconstructed surface compared to a previous result with a Na-22-based positron beam [3]. An improved signal-to-noise ratio in the obtained pattern due to the intensified beam allowed an observation of clear fractional-order spots in the higher Laue-zones, which had not been observed previously. The much intensified beam with the present system allows adjustment of the sample orientation without accumulating the positron signals. With the brightness enhanced beam, several remarkable results have been obtained efficiently by users of this facility. (Everybody is invited to use KEK Slow Positron Facility through approval of his/her research proposal.)

Development of the slow positron beam system as a commercial prototype

1994 ◽  
Author(s):  
Hikaru Ueno ◽  
Osamu Azuma ◽  
Takafumi Ogawa ◽  
Takashi Sato ◽  
Tatsumi Kawaratani ◽  
...  
Keyword(s):  
Positron Beam ◽  
Slow Positron ◽  
Beam System

scholarly journals Development of a Slow Positron Beam System for in-situ Lifetime Measurements During Ion Beam Irradiation

2012 ◽  
Vol 35 ◽  
pp. 111-116 ◽  
Author(s):  
A. Kinomura ◽  
R. Suzuki ◽  
T. Ohdaira ◽  
N. Oshima ◽  
B.E. O’Rourke ◽  
...  
Keyword(s):  
Ion Beam ◽  
Positron Beam ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Lifetime Measurements ◽  
Slow Positron ◽  
Beam System

scholarly journals Conceptual designing of a slow positron beam system using Simion simulation program

2019 ◽  
Vol 9 (2) ◽  
pp. 45-51
Author(s):  
Thanh Long Cao ◽  
Dong Phuong Huynh ◽  
Trung Hieu Nguyen ◽  
Quoc Dung Tran
Keyword(s):  
Charged Particles ◽  
Positron Beam ◽  
Simulation Program ◽  
Design Models ◽  
Slow Positron ◽  
Trajectory Calculation ◽  
Trajectory Simulation ◽  
Beam System ◽  
Materials Research ◽  
Simion Simulation

The slow positron beam system is an important device in the study of positron physics and techniques, especially in materials research. This paper presents obtained results in studying and applying a charged particles trajectory simulation program – Simion for building feasible design models for the system. The built models with different designs based on reference designs of some typical systems include a straight-shaped model, a 500 bent-shaped model and a 900 bent-shaped model. Some positron beam trajectory calculation tests have been performed for comparison between the models. From the tests, the 500 bent-shaped model has been proposed as a conceptual design for building a real slow positron beam system in the future in Vietnam.

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