High Efficiency Low‐Pressure Ion Source

C. E. Carlston; G. D. Magnuson

doi:10.1063/1.1718022

Phase transformation under beam-target interactions during high-intensity pulsed ion beam irradiation at low pressure

Laser and Particle Beams ◽

10.1017/s0263034611000280 ◽

2011 ◽

Vol 29 (3) ◽

pp. 283-289 ◽

Cited By ~ 5

Author(s):

X.P. Zhu ◽

F.G. Zhang ◽

Y. Tang ◽

M.K. Lei

Keyword(s):

Phase Transformation ◽

High Intensity ◽

High Efficiency ◽

Ion Beam ◽

Low Pressure ◽

Ion Source ◽

Source Material ◽

Gaseous Species ◽

Titanium Target ◽

Ion Species

AbstractNitrides and/or carbonitrides formation of high efficiency was found on titanium target under irradiation of high-intensity pulsed ion beam (HIPIB) with a few shots at a low pressure of 10−2 Pa order, which is extraordinary in comparison with conventional thermo-chemical diffusion process such as gas nitriding and/or carbonitriding of metals necessarily heated at high temperatures during a processing time of hours. The underlying mechanism of the nitrides and carbonitrides formation on titanium targets was explored by a comparative study on three typical HIPIB sources, i.e., TEMP-6, TEMP-4M, and ETIGO-II, varying the irradiation intensity within several J/cm2 per shot of a 60–70 ns pulse duration and the shot number of similar ion species. It is revealed that ambient gases and ion source material are the main sources providing the nitrogen and carbon species for the phase transformation on titanium target at the low pressures, whereas the ion species of HIPIB composition is negligible at a low implantation dose of 1013–1014 ions/cm2. The adsorbed gaseous species, the deposited layer of the ion source material, and in-situ formed compound top layer from reactions between ablation plasma and the ambient species during HIPIB irradiation, can be effectively incorporated into the irradiated target surfaces under a controlled HIPIB-target interaction.

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High efficiency low-pressure ion source

Vacuum ◽

10.1016/0042-207x(63)91646-4 ◽

1963 ◽

Vol 13 (1) ◽

pp. 25

Keyword(s):

High Efficiency ◽

Low Pressure ◽

Ion Source

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14. High efficiency low-pressure ion source

Vacuum ◽

10.1016/0042-207x(63)91550-1 ◽

1963 ◽

Vol 13 (1) ◽

pp. 18

Keyword(s):

High Efficiency ◽

Low Pressure ◽

Ion Source

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RHELP (Regenerative High Efficiency Low Pressure) Air Purification System

10.21236/ada511241 ◽

2009 ◽

Author(s):

Chang-Yu Wu ◽

Brian Damit ◽

Qi Zhang ◽

Myung-Heui Woo ◽

Wolfgang Sigmund ◽

...

Keyword(s):

High Efficiency ◽

Low Pressure ◽

Air Purification ◽

Purification System

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A high efficiency cavity ion source using TIMS for nuclear forensic analysis

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2006.11.019 ◽

2007 ◽

Vol 444-445 ◽

pp. 660-662 ◽

Cited By ~ 30

Author(s):

S. Bürger ◽

L.R. Riciputi ◽

S. Turgeon ◽

D. Bostick ◽

E. McBay ◽

...

Keyword(s):

High Efficiency ◽

Forensic Analysis ◽

Ion Source ◽

Nuclear Forensic

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Development of a New Design Method for High Efficiency Swept Low Pressure Axial Fans With Small Hub/Tip Ratio

Volume 1A: Aircraft Engine; Fans and Blowers ◽

10.1115/gt2014-25932 ◽

2014 ◽

Cited By ~ 1

Author(s):

Thore Bastian Lindemann ◽

Jens Friedrichs ◽

Udo Stark

Keyword(s):

High Efficiency ◽

Design Method ◽

Tangential Velocity ◽

Pressure Rise ◽

Low Pressure ◽

Aerodynamic Performance ◽

Low Noise ◽

Angle Distribution ◽

Sweep Angle ◽

Reduced Pressure

For a competitive low pressure axial fan design low noise emission is as important as high efficiency. In this paper a new design method for low pressure fans with a small hub to tip ratio including blade sweep is introduced and discussed based on experimental investigations. Basis is an empirical axial and tangential velocity distribution at the rotor outlet combined with a distinctive sweep angle distribution along the stacking line. Several fans were designed, built and tested in order to analyze the aerodynamic as well as the aeroacoustic behavior. For the aerodynamic performance particular attention was paid to compensate the influence of reduced pressure rise and efficiency due to increasing blade sweep. This was achieved by a method of increasing the blade chord depending on the local sweep angle which is based on single airfoil data. The tested fans without this compensation revealed a significant noise reduction effect of up to approx. 6 dB(A) for a tip sweep angle of 64° which was accompanied by an unsatisfactory effect of reduced overall aerodynamic performance. The second group of fans did not only confirm the method of the aerodynamic compensation by a nearly unchanged pressure rise and efficiency characteristic but also revealed an increased aeroacoustic benefit of in average 9.5 dB(A) compared to the unswept version. Beside the overall characteristics the individual differences between the designs are also discussed using results of wall pressure measurements which show some significant changes of the blade tip flow structure.

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