Author :
Smith, H. Vernon, Jr. ; Allison, Paul ; Sherman, Joseph D.
Author_Institution :
AT-2, MS H818 Los Alamos National Laboratory, Los Alamos, NM 87545 USA
Abstract :
Our Penning surface-plasma source (SPS) discharge chamber was enlarged 4X in two dimensions. To date, three pulsed discharge modes have been studied: two with noisy arc (¿20% H- current fluctuations) and one with quiescent arc (¿1% H- current fluctuations). Lower arc magnetic field and higher H2 gas flow allow switching from the noisy to the quiescent mode. The noisy modes yield up to 120 mA of 29-keV H- beam; for 110 mA at 29 keV, the two-dimensional normalized rms emittance is 0.017 x 0.018 ¿·cm·mrad. The quiescent mode yields 75 mA of 29-keV H- beam; for 67 mA at 24 keV, the emittance is 0.011 x 0.012 ¿·cm·mrad.
Keywords :
Fault location; Fluctuations; Laboratories; Magnetic field measurement; Magnetic fields; Magnetic noise; Particle beams; Surface discharges; Synthetic aperture sonar; Temperature;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.1985.4333727
