scholarly journals Exact analysis of surface field reduction due to field-emitted vacuum space charge, in parallel-plane geometry, using simple dimensionless equations

2008 ◽  
Vol 104 (8) ◽  
pp. 084303 ◽  
Author(s):  
Richard G. Forbes
Keyword(s):  
Space Charge ◽  
Plane Geometry ◽  
Parallel Plane ◽  
Exact Analysis ◽  
Surface Field ◽  
Vacuum Space ◽  
Dimensionless Equations

A comparison of injection laws for the space charge equations in gases and dielectrics

1993 ◽  
Vol 443 (1919) ◽  
pp. 517-546 ◽  
Keyword(s):  
Electric Field ◽  
Space Charge ◽  
Field Distribution ◽  
Steady Motion ◽  
Plane Geometry ◽  
Symmetric Problem ◽  
Injection Process ◽  
Underlying Geometry ◽  
Current Characteristics ◽  
The Stability

We consider the steady motion of space charge from an injecting electrode to an earthed electrode in both a gas and a dielectric. Three models governing the process of charge injection from the electrode into the medium are compared and the resulting voltage–current characteristics calculated. In particular we examine injection laws in which the electric field, charge or current are specified. It is shown that if the injecting electrode is small in comparison to the underlying geometry then the resulting field distribution is almost independent of the injection process. The stability of the three models is compared and it is shown that the field specified and charge specified models are always stable. The calculations are performed exactly for the case of a symmetric problem and make use of the Deutsch approximation for a needle-plane geometry.

scholarly journals Space-Charge Limitation of a Femtosecond Photoinjector

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Hiroko Yamamoto ◽  
Hiroaki Hamabe ◽  
Shintaro Sone ◽  
Soichiro Yamaguchi ◽  
Makoto R. Asakawa
Keyword(s):  
Experimental Investigation ◽  
Space Charge ◽  
Current Density ◽  
Cathode Surface ◽  
Laser Pulses ◽  
Space Charge Limited Current ◽  
Electron Bunches ◽  
Surface Field ◽  
Simple Physical Model ◽  
Fs Laser

Experimental investigation of a compact 40-kV diode-type photoelectric DC gun driven by 100 fs laser pulses revealed that the space-charge-limited current density could exceed 30 kA/cm2and that the density increased linearly with the accelerating voltage. We explained these important properties by the balance between the cathode surface field and the field produced by sheet-like electron bunches near the cathode surface. Our simple physical model agreed well with the experimental results.

Vacuum space-charge effects in nano-ARPES

2012 ◽  
Vol 85 (7) ◽  
Author(s):  
S. Hellmann ◽  
T. Ott ◽  
L. Kipp ◽  
K. Rossnagel
Keyword(s):  
Space Charge ◽  
Space Charge Effects ◽  
Charge Effects ◽  
Vacuum Space

scholarly journals Measurement of electric field with space charge in parallel plane electrode model.

1986 ◽  
Vol 106 (4) ◽  
pp. 157-163
Author(s):  
Takashi Ishikawa ◽  
Motoshige Yumoto ◽  
Takao Sakai
Keyword(s):  
Electric Field ◽  
Space Charge ◽  
Parallel Plane ◽  
Plane Electrode

Space charge in insulators with needle-plane geometry

1991 ◽  
Vol 24 (3) ◽  
pp. 398-406 ◽  
Author(s):  
R W Hare ◽  
R M Hill
Keyword(s):  
Space Charge ◽  
Plane Geometry
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