Iron plasma generation using a Nd:YAG laser pulse of several hundred picoseconds

We investigated the high intensity plasma generated by using a Nd:YAG laser to apply a laser-produced plasma to the direct plasma injection scheme. The capability of the source to generate high charge state ions strongly depends on the power density of the laser irradiation. Therefore, we focused on...

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Bibliographic Details
Published in:Review of scientific instruments 2016-02, Vol.87 (2), p.02A919-02A919
Main Authors: Tamura, Jun, Kumaki, Masafumi, Kondo, Kotaro, Kanesue, Takeshi, Okamura, Masahiro
Format: Article
Language:English
Subjects:
Charge distribution
CHARGE STATES
FARADAY CUPS
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Ion currents
Iron
IRON IONS
Irradiation
LASER RADIATION
LASER-PRODUCED PLASMA
Lasers
NEODYMIUM LASERS
Plasma injection
POWER DENSITY
Pulse duration
Pulsed lasers
PULSES
Scientific apparatus & instruments
Semiconductor lasers
SURFACES
YAG lasers
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Summary:We investigated the high intensity plasma generated by using a Nd:YAG laser to apply a laser-produced plasma to the direct plasma injection scheme. The capability of the source to generate high charge state ions strongly depends on the power density of the laser irradiation. Therefore, we focused on using a higher power laser with several hundred picoseconds of pulse width. The iron target was irradiated with the pulsed laser, and the ion current of the laser-produced iron plasma was measured using a Faraday cup and the charge state distribution was investigated using an electrostatic ion analyzer. We found that higher charge state iron ions (up to Fe(21+)) were obtained using a laser pulse of several hundred picoseconds in comparison to those obtained using a laser pulse of several nanoseconds (up to Fe(19+)). We also found that when the laser irradiation area was relatively large, the laser power was absorbed mainly by the contamination on the target surface.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4938258