THE EFFECT OF CATHODE AND GAS TYPE ON ELECTRON BEAM PRODUCED BY LOW PRESSURE ELECTRICAL DISCHARGE

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MORTAZAVI S.H.; SARI A.H.; GHORANNEVISS M.; GHOMI H.R.

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Journal: JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY) Year:2011 | Volume:21 | Issue:79 (PHYSICS ISSUE) Page(s): 59-77

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Title

THE EFFECT OF CATHODE AND GAS TYPE ON ELECTRON BEAM PRODUCED BY LOW PRESSURE ELECTRICAL DISCHARGE

Author(s)

MORTAZAVI S.H. | SARI A.H. | GHORANNEVISS M. | GHOMI H.R. | Issue Writer Certificate

Keywords

ELECTRON BEAMQ2

ELECTRICAL DISCHARGEQ3

CATHODEQ2

PACHEN CUQ2

Abstract

Introduction: In a cold CATHODE electron source ELECTRON BEAM is created by electrical gas discharge. It is based on electron emission from a CATHODE surface by ions and energetic neutral impact. Different parameters such as material and geometry of CATHODE surface, pressure and plasma gas type are effective in ELECTRON BEAM characteristics.Aim: How CATHODE material, pressure and plasma gas affect on ELECTRON BEAM formation Materials and Methods: Helium, Hydrogen and Argon were used for low pressure electrical gas discharge. Different CATHODEs such as aluminium, stainless steel, copper and brass were tested. In order to investigate the CATHODE geometry we used various curvatures 60- 8-100 mm and flat. Voltage-current characteristic, PACHEN CUrve and ELECTRON BEAM current in above condition were measured and analyzed.Results: For helium and argon, breakdown occurs in a pressure which is ten times smaller than argon. The argon atoms in comparison to other gases' atoms produce larger sputtering effect from CATHODE surface that is inconvenient. Aluminium has two properties to be a nice CATHODE in comparison with copper. It has smaller sputtering yield and higher secondary electron emission coefficient.Conclusion: The results show that between various CATHODE material, aluminium and copper have maximum and minimum ELECTRON BEAM current respectively, and concave CATHODE has positive effect. The discharge confirm PACHEN CUrve and the facility works on the left side of this curve. The ELECTRICAL DISCHARGEs of gases such as helium, hydrogen in comparison to argon are more stable to form the ELECTRON BEAM.

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APA: Copy

MORTAZAVI, S.H., SARI, A.H., GHORANNEVISS, M., & GHOMI, H.R.. (2011). THE EFFECT OF CATHODE AND GAS TYPE ON ELECTRON BEAM PRODUCED BY LOW PRESSURE ELECTRICAL DISCHARGE. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), 21(79 (PHYSICS ISSUE)), 59-77. SID. https://sid.ir/paper/70451/en

Vancouver: Copy

MORTAZAVI S.H., SARI A.H., GHORANNEVISS M., GHOMI H.R.. THE EFFECT OF CATHODE AND GAS TYPE ON ELECTRON BEAM PRODUCED BY LOW PRESSURE ELECTRICAL DISCHARGE. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)[Internet]. 2011;21(79 (PHYSICS ISSUE)):59-77. Available from: https://sid.ir/paper/70451/en

IEEE: Copy

S.H. MORTAZAVI, A.H. SARI, M. GHORANNEVISS, and H.R. GHOMI, “THE EFFECT OF CATHODE AND GAS TYPE ON ELECTRON BEAM PRODUCED BY LOW PRESSURE ELECTRICAL DISCHARGE,” JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), vol. 21, no. 79 (PHYSICS ISSUE), pp. 59–77, 2011, [Online]. Available: https://sid.ir/paper/70451/en

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