APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue

24 Dec 2007

Volume 91, Issue 26, Articles (26xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 91, 261106 (2007); http://dx.doi.org/10.1063/1.2825578 (3 pages)

W. M. Zhu, T. Zhong, A. Q. Liu, X. M. Zhang, and M. Yu
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Plasma-assisted laser ablation of tungsten: Reduction in ablation power threshold due to bursting of holes/bubbles

Shin Kajita, Noriyasu Ohno, Shuichi Takamura, Wataru Sakaguchi, and Dai Nishijima

Appl. Phys. Lett. 91, 261501 (2007); http://dx.doi.org/10.1063/1.2824873 (3 pages) | Cited 9 times

Online Publication Date: 27 December 2007

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Nanosecond laser ablation of tungsten (W) exposed to helium plasma is investigated using optical emission spectroscopy. Submicrometer-sized holes/bubbles are formed on the surface of W when it was exposed to the helium plasma at a sufficiently high temperature (≳1500–1600 K). The emissions from a virgin W (before the helium plasma irradiation) cannot be detected when the fluence is <1 J/cm2; however, the threshold fluence for the detection of neutral W emission after it was exposed to the helium plasma is ∼ 0.2 J/cm2. The physical mechanism of laser-induced bursting of holes/bubbles is proposed for achieving a significant reduction in ablation power threshold.
Show PACS
52.38.Mf Laser ablation
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.40.Hf Plasma-material interactions; boundary layer effects

Field-aligned and transverse plasma-potential structures induced by electron cyclotron waves

K. Takahashi, T. Kaneko, and R. Hatakeyama

Appl. Phys. Lett. 91, 261502 (2007); http://dx.doi.org/10.1063/1.2827575 (3 pages) | Cited 6 times

Online Publication Date: 27 December 2007

Full Text: Read Online (HTML) | Download PDF

Show Abstract
It is demonstrated that potential structures of a magnetized plasma column can be controlled by electron cyclotron waves of azimuthal mode number m = ±1. A field-aligned plasma potential structure, i.e., an electric double layer with the potential jump corresponding to the ion flow energy is created around the electron cyclotron resonance point at the center and peripheral areas of the plasma column for m = +1 and −1 modes, respectively. As a result, transversely outward and inward electric fields are locally generated. Our experimental results show that the created potential structures are greatly relevant to the polarization profiles of the injected waves and the resultant heating profiles.
Show PACS
52.25.Xz Magnetized plasmas
52.50.Sw Plasma heating by microwaves; ECR, LH, collisional heating
52.35.Fp Electrostatic waves and oscillations (e.g., ion-acoustic waves)
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close