Dynamitron
A dynamitron is a DC voltage accelerator for electrons or ions .
function
As with the Cockcroft-Walton generator, the acceleration high voltage is generated by rectifier elements connected in series. The supply of the individual stages with alternating voltage does not take place in series as there, but in parallel. For this purpose, two large, semi-cylindrical electrodes are located in the accelerator tank concentrically around the acceleration tube. They form the capacity of a parallel resonant circuit that is supplied with power by a high-frequency oscillator with a frequency of 100 kHz. Between these electrodes and the acceleration tube there are further, semi-circular electrodes into which the high-frequency power is capacitively coupled. The half-rings are connected to one another by rectifier diodes so that the direct voltages add up. The pressure tank is filled with sulfur hexafluoride gas to avoid electrical flashovers.
Dynamitrons are built for acceleration voltages of up to about 4 MV and deliver beam currents around 1 mA, in the most powerful devices up to 10 mA electrons and 100 mA ions.
The parallel feed of the rectifier stages has the advantage of lower stored energy over the series feed, so that possible discharges cause less damage.
development
The Dynamitron was developed in the 1960s by the company Radiation Dynamics . A further development is the tandetron , in which both ends of the acceleration section are at earth potential. Tandetrons are z. B. used in proton implants.
literature
F. Hinterberger: Physics of Particle Accelerators and Ion Optics . 2nd edition, Springer 2008, ISBN 978-3-540-75281-3
R. Hellborg (Ed.): Electrostatic Accelerators . Springer Verlag, 2005, ISBN 3-540-23983-9 . Page 106 f.
