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

Published online by Cambridge University Press:  11 July 2019

A. Pushkarev Open the ORCID record for A. Pushkarev [Opens in a new window] ,
X. P. Zhu ,
A. Prima ,
Yu. Egorova  and
M. K. Lei
A. Pushkarev*
Affiliation:
Tomsk Polytechnic University, 634050 Tomsk, Russia Dalian University of Technology, Dalian 116024, China
X. P. Zhu
Affiliation:
Dalian University of Technology, Dalian 116024, China
A. Prima
Affiliation:
Tomsk Polytechnic University, 634050 Tomsk, Russia
Yu. Egorova
Affiliation:
Tomsk Polytechnic University, 634050 Tomsk, Russia
M. K. Lei
Affiliation:
Dalian University of Technology, Dalian 116024, China
*
Author for correspondence: A. Pushkarev, Tomsk Polytechnic University, 634050 Tomsk, Russia and Dalian University of Technology, Dalian 116024, China, E-mail: aipush@mail.ru; principessa-88@mail.ru
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Abstract

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.

Keywords

Diagnosticsextending the range of measurementpulsed ion beam
Type
Research Article
Information
Laser and Particle Beams , Volume 37 , Issue 3 , September 2019 , pp. 260 - 267
Copyright
Copyright © Cambridge University Press 2019 

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