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论文类型：期刊论文

发表时间：2011-11-25

发表刊物：16th International Conference on Surface Modification of Materials by Ion Beams (SMMIB)

收录刊物：SCIE、EI、CPCI-S、Scopus

卷号：206

期号：5

页面范围：879-883

ISSN号：0257-8972

关键字：High-intensity pulsed ion beam; Irradiation; Energy deposition; Time-of-flight effect; Subsurface heating

摘要：The energy deposition of high-intensity pulsed ion beam (HIPIB) into a titanium target was studied in TEMP-6 apparatus of bipolar-pulse mode using a self-magnetic field magnetically insulated ion diode (MID), where anode plasma was pre-generated by a first negative voltage and then mixed carbon ions and proton beam was extracted during the positive stage of the bipolar pulse. According with the time-of-flight (TOF) of ions. C(+) arriving at the target 14 cm downstream from the MID was delayed by 55 ns relative to H(+) at a peak accelerating voltage of 250 kV and the ion energy spectrum varied greatly, starting with a Gaussian profile at exit of MID and arriving with a multi-energy complex distribution. The TOF ion energy deposition of HIPIB showed that the energy deposition proceeded firstly in a deeper depth delivered by H(+) and then moved towards a top layer dominated by C(+). It is found that, the contribution of H(+) to the energy deposition is negligible at the beam composition of 70%C(+) and 30%H(+). As a result, the gradient of energy deposition profile in target is negative by C(+) deposition through the whole pulse. This unique feature of HIPIB energy deposition can lead to different thermal and dynamic effects as compared to previous studies of H(+)-abundant HIPIB, electron or laser beam, especially limiting subsurface heating that is concerned as a major cause of droplet ejection and surface cratering and waviness formation. (C) 2011 Elsevier B.V. All rights reserved.