Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Harries, J.; Crespo Lpez-Urrutia, J.*
no journal, ,
The use of electron-beam ion traps at synchrotron and free-electron laser lightsources has been demonstrated to be a fruitful direction of study in the field of highly-charged ion spectroscopy, and the study of their interaction with short-wavelength radiation. To date studies have used a full-size, liquid-helium cooled, super-conducting magnet EBIT. To enable more widespread use a new compact electron-beam ion trap using NdFeB permanent magnets has been designed and constructed. The magnetic field at the centre of the trap can reach over 1 T, and operation with several milliamps of current at energies of a few keV has been demonstrated. The production of low charge states of noble gas ions has been confirmed, and work is currently underway to reach lower background pressures to allow highly-charged ions to be produced and trapped. For optimal use at a beamline an off-axis electron gun has been designed and is currently under construction.
森林 健悟
no journal, ,
Radial dose has been employed in the treatment planning system for heavy particle cancer therapy in order to estimate the cell survival after the exposure to a heavy particle. The two models for radial dose have been available. However, both of these two models have very roughly treated the region near the trajectory of an incident heavy particle, although this region is very important to estimate the biological effect. There are no studies involving the detailed examination of the physical phenomena that occur near the trajectory of an incident ion before ours. The progresses of atomic collision physics and computers allow us to obtain radial dose closer to reality. We may succeed to the point that our model sufficiently reproduces the trend allowing us to select the better one between the two conventional models according to incident ion energies automatically. We think that our simulation model is the only way to analyze physical phenomena near the trajectory of an incident ion in detail at present.