Production of pulsed sodium ion beams from anode plasma initiated by photon irradiation

Kitamura, Akira; Mitsuhashi, K.; Yano, Sumio

doi:10.1017/s0263034600003190

Cited by 3 publications

(4 citation statements)

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Section: Catalytic Resonance Ionization As a Technique For Multi-compmentioning

confidence: 99%

“…A more effective way to produce the plasma is by a two-step process [7,8] , where first a neutral gas cloud is produced in one way or another (e.g. by laser radiation) which then can be ionized by means of laser produced shock waves [7], an external UV-fiashlamp [8,9], or a near-surface discharge [10].An alternative way for a dense gas layer ionization is LIBORS technique (Laser Ionization Based On Resonance Saturation) [11][12][13]. A resonant dye-laser radiation provides a high non-Boltzmann population of the corresponding state.…”

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Experiments on catalytic resonance ionization of dense tantalum-contained ruby-laser-produced gas clouds with a KrF laser

et al. 1995

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In this paper we describe the principle of a technique to produce planar and volumetric plasma sources of nearly every element and results of experiments on verification of this technique. This technique is based on a generalization of the LIBORS-process (Laser Ionization BAsed On Resonant Saturation) which because of its similarity to chemical catalytic reactions has been called CATRION (CATalytic Resonance IONization). Characteristics of vapor clouds formed near wide variety of mono-or two-component targets in vacuum with a pulsed ruby laser were investigated. Effect of an intense KrF laser radiation on expanding tantalum-contained and, for comparision, titanium vapor clouds was studied. Photoresonance ionization in saturation mode of tantalum cloud was detected with the help of a frame camera, Langmuir probes and spectroscopic diagnostics. CATALYTIC RESONANCE IONIZATION AS A TECHNIQUE FOR MULTI-COMPONENT PLASMA PRODUCTIONMany industrial and scientific applications require the production of spatially localized plasma layers near to or in contact with material surfaces in vacuum. For example, such layers are needed in the formation of plasma electrodes for laser ion sources [1 2] and in different types of high power accelerators [3][4][5] . A standard way for the production of the plasma layers is to illuminate a suitable material surface with intense non-resonant laser radiation [6]. At sufficiently high exposure levels a "laser plasma" with a relatively small number of particles but with high ion-temperatures is formed. A more effective way to produce the plasma is by a two-step process [7,8] , where first a neutral gas cloud is produced in one way or another (e.g. by laser radiation) which then can be ionized by means of laser produced shock waves [7], an external UV-fiashlamp [8,9], or a near-surface discharge [10].An alternative way for a dense gas layer ionization is LIBORS technique (Laser Ionization Based On Resonance Saturation) [11][12][13]. A resonant dye-laser radiation provides a high non-Boltzmann population of the corresponding state. Then through high-frequency super-elastic collisions of seed electrons with excited atoms and stimulated bremsstrahlung absorption the radiation energy is transferred to free electrons. Eventually after a subsequent chain of events, the gas becomes ionized practically fully. The advantages of The LIBORS-method (in contrast to "laser plasma" ) is a more effective use of the available laser energy for ionization, and a low temperature of the resulting plasma ions. However, the necessity of a tunable flashlamp-pumped dye laser for the resonant excitation of the vapor limits its practical usefulness. However, due to the photochemical instability of dye lasers [14] and strong thermo-optical distortion of dye solutions they are unsuitable for operation at high repetition rates and for long time periods. In addition, to ionize different atoms one must change from one dye solution to another and tune a dispersive element of the laser. Furthermore, the resonance transitions o...

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Section: Catalytic Resonance Ionization As a Technique For Multi-compmentioning

confidence: 99%

mentioning

confidence: 99%

Experiments on catalytic resonance ionization of dense tantalum-contained ruby-laser-produced gas clouds with a KrF laser

et al. 1995

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“…Однако получение импульсных пучков ионов металлов связано со значительными физическими ограничениями и техническими трудностями. Доля тока, переносимая импульсными пучками ионов металлов, в полном токе ионного пучка, как правило, не превышает 20−30% [5][6][7][8]. Некоторыми авторами даже делается вывод о принципиальной невозможности получения пучков ионов тяжелых металлов в импульсных системах с пассивным анодом из-за того, что во внешнем электрическом поле легкие ионы быстрее набирают скорость и начинают экранировать собственным электрическим полем более тяжелые ионы, находящиеся во внутренних областях плазмы, тем самым препятствуя их ускорению [9].…”

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Генерация Многозарядных Ионов Металлов В Ионном Диоде С Магнитной Самоизоляцией

Шаманин¹,

Тарбоков²

2023

Письма В Журнал Технической Физики

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A self-magnetically insulated ion diode was used to produce a pulsed beam of metallic ions from explosion emission plasma. The ratio of integral transferred charge for the Al, Ti and Mo ions amounted to at least 63% to the total beam charge. The ion diode had design features, which consisted in a bladed cathode and a removable perforated anode overlay made of VT-8 alloy. Analysis of the charge to mass characteristics of beam ions and the ion current density waveforms by the time of flight methodic with use of a Faraday cup showed the content of aluminum and titanium ions in the third to fourth states of ionization.

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“…However, the production of pulsed beams of metal ions is subject to considerable physical limitations and technical difficulties. The ratio of current carried by pulsed beams of metal ions to the total ion-beam current does not normally exceed 20−30% [5][6][7][8]. The authors of certain studies have even concluded that it is essentially impossible to produce beams of ions of heavy metals in pulsed systems with a passive anode, since the velocity of light ions in an external electric field grows faster; as a result, these ions start screening heavier ions, which are located in the inner regions of plasma, by their intrinsic electric field, thus interfering with the acceleration of heavier ions [9].…”

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confidence: 99%