Glow-discharge-created electron beams: Cathode materials, electron gun designs, and technological applications

Rocca, J. J.; Meyer, J. D.; Farrell, M.; Collins, G. J.

doi:10.1063/1.334008

Cited by 99 publications

(32 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several types of cold cathode glow discharges have been utilized to produce pulsed [1]- [4] as well as CW electron beams [5], [6]. The beams produced by these discharges have been used for various materials processing applications, including annealing [7]- [9], thin film deposition [10]- [12], and the etching of diamond films [13].…”

mentioning

confidence: 99%

A simple model of a glow discharge electron beam for materials processing

Etcheverry

Míngolo

Rocca

et al. 1997

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

Abstract-A simple semiempirical model of the electron beam generated by a pulsed cold cathode electron gun has been developed. The model describes analytically the observed self-focusing of the discharge and predicts the dynamical variation of the focal distance, in good agreement with experiments. This effect plays a major role in the determination of the effective duration of the energy pulse. The model was used to conduct simple calculations of energy thresholds for melting of solid materials, giving helpful insight on ranges of operation of this kind of electron gun for its application to material processing. A comparison with available experimental data for Mg 70 Zn 30 samples is given.

show abstract

mentioning

confidence: 99%

A simple model of a glow discharge electron beam for materials processing

Etcheverry

Míngolo

Rocca

et al. 1997

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

show abstract

“…To reduce the cathode layer effect, secondary emission coefficient was varied from the baseline value of -y0.01 to y=1.0, which comparable with the values measured for Be/Cu and A1 2 0 3 /Mo cathodes [28,29]. Townsend ionization coefficient, a, was also varied by adding up to 1000 ppm of C 9 H 15 N to the mixture, assuming that parameter C for the seed in Eqs.…”

Section: Discharge Modeling Calculationsmentioning

confidence: 99%

MHD Flow Control and Power Generation in Low-Temperature Supersonic Flows

Nishihara

Rich

Lempert

et al. 2006

37th AIAA Plasmadynamics and Lasers Conference

View full text Add to dashboard Cite

The public reporting burden for this collecbon of information is esbmated to average 1 hour per response. including the time for reviewing instructions, searching existing data sources. galhenng and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden. Approved for public release; distribution unlimited. SUPPLEMENTARY NOTES ABSTRACTReport developed under STTR contract for topic AF05-TO1 6. Results of cold MHD flow deceleration and MHD power-generation experiments conducted at The Ohio State University are presented. MHD effect on the flow is detected from flow static-pressure measurements. The observed static-pressure change is due to the MHD interaction and not Joule heating of the flow in the crossed discharge. Comparison of experimental results with modeling calculations shows that the retarding Lorentz force increases the static-pressure rise produced by Joule heating of the flow, while the accelerating Lorentz force reduces the pressure rise. The experiments show that at the present conditions, the electric current in the MHD power-generation regime is very low, on the order of 1 mA. This is entirely due to the bottleneck effect of the discharge cathode layer at conditions where the MHD open voltage is significantly lower than the cathode-voltage fall. Modeling calculations demonstrate that (1) at the flow conductivities currently achieved in low-temperature MHD flows (a -0.1 mho/m), low open voltages reduce the MHD currents by more than two orders of magnitude, and (2) this effect cannot be circumvented by seeding the flow at feasible levels (-0.1%) or using electrodes with a high secondary-emission coefficient. SUBJECT TERMS STTR

show abstract

“…For the closed face geometry, a small fraction of the plasma electrons become beam electrons after acceleration across the cathode sheath (or other such accelerating voltage) outside the hollow cathode aperture. In the open face guns, it is the secondary electrons emitted from the cathode walls that form the beam electrons [1]. The latter is the primary electron beam source used in LAPPS [2] and the focus of this paper.…”

Section: A Backgroundmentioning

confidence: 99%

Hollow Cathode Produced Electron Beams for Plasma Generation: Cathode Operation in Gas Mixtures

Walton¹,

Leonhardt²,

Fernsler³

2006

View full text Add to dashboard Cite

Standard Form 298 (Rev. 8-98)Prescribed by ANSI Std. Z39.18Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Pulsed hollow cathode discharges, used to generate kilovolt electron beams for the production of plasmas, were studied in low pressure (50-70 mTorr) backgrounds of argon, oxygen, nitrogen, SF 6 and mixtures thereof. Cathode currents were measured as a function of cathode voltage, duty factor, and relative gas concentration. The cathode current was found to have a dependence on all variables, with the greatest impact being operating gas for all voltages and duty factors. The ambient gas is thought to influence the production of secondary electrons at the cathode surface, thereby impacting the operation of the hollow cathode discharge and electron beam production. REPORT TYPE 1. REPORT DATE (DD-MM-YYYY) TITLE AND SUBTITLE AUTHOR(S) PERFORMING ORGANIZATION REPORT NUMBER PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) SPONSOR / MONITOR'S ACRONYM(S) 9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR / MONITOR'S REPORT NUMBER(S) 15-12-2006Memorandum Report AbstractPulsed hollow cathode discharges, used to generate kilovolt electron beams for the production of plasmas, were studied in low pressure (50-70 mTorr) backgrounds of argon, oxygen, nitrogen, SF 6 and mixtures thereof. Cathode currents were measured as a function of cathode voltage, duty factor, and relative gas concentration. The cathode current was found to have a dependence on all variables, with the greatest impact being operating gas for all voltages and duty factors. The ambient gas is thought to influence the production of secondary electrons at the cathode surface, thereby impacting the operation of the hollow cathode discharge and electron beam production.

show abstract

Glow-discharge-created electron beams: Cathode materials, electron gun designs, and technological applications

Cited by 99 publications

References 19 publications

A simple model of a glow discharge electron beam for materials processing

A simple model of a glow discharge electron beam for materials processing

MHD Flow Control and Power Generation in Low-Temperature Supersonic Flows

Hollow Cathode Produced Electron Beams for Plasma Generation: Cathode Operation in Gas Mixtures

Contact Info

Product

Resources

About