High-intensity pulsed ion beam focusing by its own space charge

Zhu, Xiuling; Zhang, Q.; Ding, Lei; Zhang, C.C.; Isakova, Yu. I.; Prima, A.; Pushkarev, A. I.; Lei, M.K.

doi:10.1017/s0263034618000514

Cited by 4 publications

(1 citation statement)

References 20 publications

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“…An error in measuring the ioncurrent density due to the overlap of the collimating hole of the Faraday cup by the ablative plasma was found in [16]. When using a metal grid to attenuate an HPIB, the beam may be additionally focused by its own spatial charge [17].…”

Section: The Expansion Of the Measurement Rangementioning

confidence: 99%

Diagnostics of Pulsed Beams of Electrons, Ions, and Atoms (Review)

et al. 2020

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A review of methods for diagnosing the most important parameters of pulsed beams of electrons, ions, and accelerated atoms, such as the current density, fluence, total energy per pulse, the energy density distribution over the cross section, the composition of the beam, and its energy spectrum, is presented. The main attention is paid to the methods of diagnostics of beams intended for technological applications with a particle energy of 0.01–1 MeV and an energy density of 0.1–10 J/cm2. This paper contains a description of each diagnostic method, its scope of application, and systematic errors. The thermal imaging diagnostics of the total energy of a particle beam, the energy-density distribution over the cross section, the beam movement in the focal plane in a series of pulses, and the beam divergence during its transport to the target are considered. The time-of-flight diagnostics of ion beams is presented, which allows determining the beam composition, the fluence, and the energy spectrum of each type of ion in a beam of a complex composition (ions with different masses and degrees of ionization). The acoustic (thermoradiation) diagnostics based on the detection of acoustic waves, which are generated by a particle beam in a metal target by a piezoelectric transducer, is described.

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Section: The Expansion Of the Measurement Rangementioning

confidence: 99%

Diagnostics of Pulsed Beams of Electrons, Ions, and Atoms (Review)

et al. 2020

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Comprehensive material constraints incorporation in coupled thermal-mechanical responses modelling for high-intensity pulsed ion beam processing of metals

Zhang

Zhu

Zhang

et al. 2019

Nuclear Instruments and Methods in Physics Research Section B:

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Extending the range of measurement of thermal imaging diagnostics of a high-intensity pulsed ion beam

et al. 2019

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Thermal imaging diagnostics was used as a surface temperature mapping tool to characterize the energy density distribution of a high-intensity pulsed ion beam. This approach was tested on the TEMP-6 accelerator (200–250 kV, 150 ns). The beam composition included carbon ions (85%) and protons, and the energy density in the focus was 5–12 J/cm2. Targets of stainless steel, titanium, brass, copper, and tungsten were examined. Our observations show that the maximum energy density measured with the thermal imaging diagnostics considerably exceeds the ablation threshold of the targets. An analysis of the overheating mechanisms of each target was carried out, including metastable overheating of the target to above its boiling temperature during rapid heating; formation, migration, and the subsequent annealing of fast radiation-induced defects in the target under ion beam irradiation. This expands the range of energy density measurement for this thermal imaging diagnostics from 2–3 J/cm2 up to 10–12 J/cm2 but introduces error into the results of measurement. For a stainless steel target, this error exceeds 15% at an energy density of more than 4 J/cm2. A method of correcting the results of the thermal imaging diagnostics is developed for a pulsed ion beam under conditions of intense ablation of the target material.

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High-intensity pulsed ion beam focusing by its own space charge

Cited by 4 publications

References 20 publications

Diagnostics of Pulsed Beams of Electrons, Ions, and Atoms (Review)

Diagnostics of Pulsed Beams of Electrons, Ions, and Atoms (Review)

Comprehensive material constraints incorporation in coupled thermal-mechanical responses modelling for high-intensity pulsed ion beam processing of metals

Extending the range of measurement of thermal imaging diagnostics of a high-intensity pulsed ion beam

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