A Pulsed Neutron TOF Facility at Chiang Mai

Vilaithong, T.; Singkarat, S.; Pairsuwan, W.; Král, J.; Boonyawan, Dheerawan; Suwannakachorn, D.; Konklong, S.; Kanjanarat, Penkarn; Hoyes, G.

doi:10.1007/978-3-642-58113-7_138

Cited by 3 publications

(5 citation statements)

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“…10 A schematic diagram of the experimental set up is shown in Fig 1. A cylindrical sample of 209 Bi, 3 cm in diameter and 7 cm long, was positioned at 90 o relative to the incident deuteron beam with its axis along the axis Monte Carlo calculation indicates that effect due to in-scattered neutrons is less than 1%. 11 The neutron detector was housed in a temperature controlled room to minimize photomultipher tube gain drift.…”

Section: Methodsmentioning

confidence: 99%

“…10 Only a brief description will be given here. A pulse-shape discrimination system (PSD) based on a zero-cross over method was incorporated into the main electronic system to reduce the gamma-ray background.…”

Section: Methodsmentioning

confidence: 99%

“…The experimental procedure and data reduction is similar to that described in details elsewhere. 10 The correction for multiple scattering, flux attenuation and contamination of low energy neutrons in the incident neutron spectrum was performed using a Monte Carlo computer code SYNTHIA developed by Baba et al 13 at Tohoku University. The DDX data were converted from the laboratory system to the center-of-mass system (CM), by assuming the kinematics of two body reaction.…”

Section: Data Reductionmentioning

confidence: 99%

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Vilaithong¹,

Tippawan²,

Singkarat³

et al. 1999

ScienceAsia

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The energy and angular distributions of neutrons above 3 MeV emitted from collisions of 14.1 MeV neutrons with bismuth target were measured using the high resolution time-of-flight (TOF) facility at Chiang Mai University. The results are compared with the most recent measurements and with the calculated spectra based on the statistical multistep model code EXIFON. The angular distributions of the secondary neutrons were analyzed by the Kalbach-Mann systematics using the more recent coefficients of Kumabe et al. In the case of bismuth, the measured and calculated spectra only agree in the limited energy region between 6 and 12 MeV.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Data Reductionmentioning

confidence: 99%

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Vilaithong¹,

Tippawan²,

Singkarat³

et al. 1999

ScienceAsia

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“…A medium-energy is suitable for this technique without damaging the surface of the sample. The existing accelerator [1] at FNRF of Chiang Mai University is upgraded to be more efficient. The helium ion pulsed beam with 280 keV was suitable for components in the accelerator.…”

Section: Introductionmentioning

confidence: 99%

Bunch Compression of a Non-Relativistic 280-keV-He<sup>+</sup> Beam

Junphong

Ano²,

Lekprasert³

et al. 2005

SSP

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At 150 kV-pulsed neutron generator at the Fast Neutron Researh Facility is being upgraded to produce a 280-kV-pulsed-He beam for Time-of-Flight Rutherford Backscattering Spectrometry (TOF RBS). Modification are being done by replacing the existing beamline elements by a 400-kV accelerating tube, 45o-double focusing dipole magnet and quadrupole lens. The beam transport system has to be redesigned based on the new elements. The important part of a good pulsed beam depends on the pulsing system. The two main parts are the chopper and buncher. Radiofrequency (RF) of 2 MHz is used for the chopper and 4 MHz for the buncher. For the buncher the RF amplitude of 13 kV is applied to two gaps, so that the ion pulse is compressed twice. An optimized geometry for the 280-keV pulsed helium ion beam is presented in this paper,. The PARMELA code has been used to optimize the space-charge effect, resulting in a excitated pulse width of less than 2 ns at a target. The calculated distance from a buncher to the target is 4.6 m. Effects of energy spread and phase angle between the chopper and buncher have been included in the optimization of the bunch lengh.

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“…In low energy ion beam deposition processes, very low energy spread is required in order to separate and focus the ions properly [3]. In neutron time-of-flight experiments, a low energy-spread beam is needed to obtain a well defined short pulse [4]. This article reviews different techniques for measuring the axial ion energy spread of the multicusp ion source.…”

Section: Introductionmentioning

confidence: 99%

Very-low-energy-spread ion sources

Lee

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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Axial ion energy spread of multicusp sources has been measured by three different techniques: an electrostatic energy analyzer for plasma ion measurement at the source exit; a magnetic deflection spectrometer; and a retarding-field energy analyzer for measurement of the accelerated beam. By introducing a magnetic filter inside the multicusp source chamber, it is shown that the energy spread of positive hydrogen ions can be reduced to approximately 1eV. The energy-spread values for H -ions are lower. New ion source configurations are now being investigated to further reduce the ion energy spread to below 1 eV and maximize source performance reliability and lifetime.

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A Pulsed Neutron TOF Facility at Chiang Mai

Cited by 3 publications

References 1 publication

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Bunch Compression of a Non-Relativistic 280-keV-He<sup>+</sup> Beam

Very-low-energy-spread ion sources

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