Showing papers by "Alexander Vodopyanov published in 2002"
TL;DR: In this article, two new approaches of ECR devices are proposed to produce high currents of pulsed heavy ion beams dedicated to synchrotron injection, and two experiments are in progress at ISN/Grenoblea and IAP/Nizhny Novgorod.
Abstract: In order to study the possibilities to produce high currents of pulsed heavy ion beams dedicated to synchrotron injection, two new approaches of ECR devices are now underway. The basic principle consists in maintaining a functioning point of the source with the highest density as possible and a minimum confinement time for the production of a given charge state. It means that for a constant neτi product we try to maximize ne and minimize τi. For this purpose two experiments are in progress at ISN/Grenoblea and IAP/Nizhny Novgorod.b The first one consists of using a minimum |B| magnetic structure with a 1.8 mirror ratio characteristic value with a 28 GHz frequency injection. In this case we explore different functioning points up to 10 kW of UHF power. The second one consists of a simple mirror magnetic system (simple mirror ion source, SMIS) working at 37.5 GHz with a mirror ratio up to 3 (2.5 T) where we study discharges with a peak power up to 100 kW. We will show that, in spite of a very short rising t...
17 citations
TL;DR: In this article, it was shown that the x-ray flux produced at subharmonic resonance is five times higher than that produced at cyclotron resonance, the photon energy being higher.
Abstract: Described in the present paper is the observation of a resonant increase of x-ray emission in a microwave discharge at half-gyrofrequency, where the equality ω=12ωBe is satisfied (here, ω is the microwave frequency and ωBe is the gyrofrequency of electrons). These experiments show, for the first time, that the x-ray flux produced at subharmonic resonance is five times higher than that produced at the cyclotron resonance, the photon energy being higher.
2 citations
25 Feb 2002
TL;DR: In this paper, a review of the most advanced devices for production of stable gaseous and metallic ions and specially the high frequency studies dedicated to the ion sources using a 28 GHz gyrotron or higher.
Abstract: There are now two main fields of the ECR ion sources development. The first one consists in going on the upgrade of the current delivered by the sources, mainly in connection with the production of secondary beams. The second one is the study of the improvement of the particle efficiency of sources for the ionization of rare radioactive species. We will make a review of the most advanced devices for production of stable gaseous and metallic ions and specially the high frequency studies dedicated to the ion sources using a 28 GHz gyrotron or higher. We will see that for cyclotrons, the main demand consists in upgrading the current of relatively low charge state ions like in GANIL or MSU. The second aspect is the use of ECR ion sources as high efficiency charge breeder for radioactive ions. This method, called “1+/n+”, consists in injecting and decelerating a monocharged beam extracted from a simple radioactive source and then, in re-extracting the highest number of injected ions as multicharged ions. We wi...
1 citations