Title :
Impedance collapse and beam generation in a high power planar diode
Author :
Roy, Amitava ; Menon, R. ; Mitra, S. ; Kumar, D.D.P. ; Kumar, Senthil ; Sharma, Archana ; Mittal, K.C. ; Nagesh, K.V. ; Chakravarthy, D.P.
Author_Institution :
Accel. & Pulse Power Div., Bhabha Atomic Res. Centre, Mumbai
Abstract :
Summary form only given. Intense relativistic electron beam generation studies were carried out in a planar diode configuration to investigate the effect of the plasma expansion on the impedance characteristics of the diode. The diode voltage and current waveforms were analyzed with the bipolar space-charge limited flow model. The anode and cathode plasma expansion velocities were calculated using the perveance data. The plasma expands at 9.5 cm/mus for 31 mm anode-cathode gap and the plasma velocity decreases for smaller gap. It was found that the electron emission is more uniform for 25 mm anode-cathode gap as compared to 31 mm gap. Effect of a nylon sheet on the anode plate has been studied with respect to the impedance characteristic of the diode. It was found that the plasma expand with a faster velocity in the presence of nylon sheet on anode.
Keywords :
plasma diodes; relativistic electron beams; anode-cathode gap; beam generation; bipolar space-charge limited flow model; current waveforms; diode voltage; distance 25 mm; distance 31 mm; electron emission; high power planar diode; impedance collapse; nylon sheet; perveance data; plasma expansion velocities; relativistic electron beam generation; Anodes; Cathodes; Character generation; Diodes; Electron beams; Impedance; Plasma properties; Plasma waves; Power generation; Voltage;
Conference_Titel :
Plasma Science, 2008. ICOPS 2008. IEEE 35th International Conference on
Conference_Location :
Karlsruhe
Print_ISBN :
978-1-4244-1929-6
Electronic_ISBN :
0730-9244
DOI :
10.1109/PLASMA.2008.4590853
