Title :
Multi-shot performance of a 1-MV, 15-kA rod-pinch-like diode for radiography
Author :
Young, F.C. ; Cooperstein, G. ; Mosher, D. ; Boller, J.R. ; Swanekamp, S.B. ; Schumer, J.W. ; Hunt, E.E. ; Ormond, E.C. ; Droemer, D.W. ; Utiger, H.E. ; DeHope, W.J.
Author_Institution :
Div. of Plasma Phys., Naval Res. Lab., Washington, DC, USA
Abstract :
A rod-pinch diode, modified to operate in a non-pinching mode, is tested for multi-shot operation at 1 MV and 15 kA. Three different geometry diodes are used. A 3.2-mm or 4.7-mm diameter tungsten-rod anode, tapered on the end, is used to minimize anode damage and to maintain a small source size. The diode parameters are chosen to avoid beam pinching. The diode operates successfully for at least 5 to 9 shots depending on the geometry. The first shot operates at higher impedance due to late-time anode ion turn-on. Multi-shot operation is limited by anode rod damage. The dose on-axis at 1 meter from the source is 0.7 to 0.9 rad(Si) and varies by /spl plusmn/20% from shot to shot. The source diameter is 2 to 4 mm and decreases from the first to the last shot even though the dose is not degraded.
Keywords :
diodes; radiography; 0.7 to 0.9 rad; 1 MV; 15 kA; W rod anode; multi-shot operation; radiography; rod-pinch diode; source diameter; Anodes; Cathodes; Diodes; Electron beams; Geometry; Plasmas; Radiography; Testing; Tungsten; Voltage;
Conference_Titel :
Pulsed Power Plasma Science, 2001. PPPS-2001. Digest of Technical Papers
Conference_Location :
Las Vegas, NV, USA
Print_ISBN :
0-7803-7120-8
DOI :
10.1109/PPPS.2001.1002128
