1. Effect of reconstruction filter on image in dental cone beam computed tomography Yuuki Houno 2. Characteristics of image in dual-energy computed tomography(CT) imaging Dae Hong Kim 3. Verification of lateral biological dose distribution with microdosimetric kinetic model in carbon-ion radiotherapy Mikoto Tamura 4. The imparct of secondary particles on in-beam PET imaging for dose verificatio...

A new scheme for the two-dimensional cooling of ion beams in storage rings is suggested in which ions interact with a counterpropagating broad-band laser beam. The interaction region in the direction of the ion movement is much less then the wavelength of the ion betatron oscillations. The laser beam in the orbit plane has sharp flat edge directed to the ion beam and the width of the laser beam...

“ -‘ One can use a feedback system to suppress the fmt ion instability. However, the feedback noise (and also other sources of noise in the machine) c-ontinously excites the transient oscillations in the electron beam that are m“plified through the electron interaction with the ions. We calculate the equilibrium level of these oscillations under the influence of the feedback and show how they g...

The High Current Experiment (HCX) is being built to explore heavy-ion beam transport at a scale appropriate to the low-energy end of a driver for fusion energy production. The primary mission of this experiment is to investigate aperture fill factors acceptable for the transport of space-charge dominated heavy-ion beams at high space-charge intensity (line-charge density ~ 0.2 μC/m) over long p...

introduction: natural organic matters (noms) existing in water resources led to various problems such as formation of disinfectant by-products (dbps). humic matters like humic acid (ha) are component of noms that should be removed from water. advanced oxidation process (aops) is one of the noms removal methods. the aim of this study was to survey the degradation of humic acid by electron beam i...

A Li vapor cell has successfully converted a He ion beam to a He ion beam by double charge exchange reaction. Emittance of the He ion beam and that of the He beam were independently measured to study emittance growth during the passage of the charge exchange cell. Each component was seperated by electrostatic deection after passing through a beam shaping slit. The result had shown that the emi...

Supersonic ion beam formation has been observed in a geometrically expanding low-pressure inductively coupled argon plasma. It is found that the ion beam is only observed below 3 mTorr and only when the discharge is operated in inductive mode. The geometrical expansion of the plasma induces density and potential gradients leading to the ion beam formation. The ion beam energy increases with dec...

The Budker-Chirikov instability (BCI) in a two-beam electron-ion system is researched. The BCI is due to the interaction of the slow cyclotron wave of the electron beam with the fast betatron wave of the ion beam. The electron-ion system consists of a high current relativistic electron beam propagating co-axially with a nonrelativistic ion beam in a drift tube. The external radii of the electro...

A neutron radiography facility utilizing a 28 GHz superconducting electron cyclotron resonance (ECR) ion source and a heavy ion accelerator is now under construction at Korea Basic Science Institute (KSBI). In order to generate a proper energy distribution of neutron, a lithium ion beam is considered. It will be accelerated up to the energy of 2.7 MeV/u by using a radio frequency quadrupole (RF...

Weak vertical coupled bunch instability with oscillation amplitude at μm level has been observed in SPEAR3. The instability becomes stronger when there is a vacuum pressure rise by partially turning off vacuum pumps and it becomes weaker when the vertical beam emittance is increased by turning off the skew quadrupole magnets. These confirmed that the instability was driven by ions in the vacuum...