DYNAMIC EFFECTS OF HIGH NU/GAMMA BEAM PLASMA INTERACTIONS.
Interim rept. 1 Nov 68-15 Mar 69,
PHYSICS INTERNATIONAL CO SAN LEANDRO CALIF
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Time and spatial definition of high nugamma beam generation and propagation has been investigated using calorimetry, voltage and current diagnostics and time of flight measurements. This work demonstrates that the main portion of these beams, in 0.5 to 1.0 torr air, propagates with a value of nugamma net which is approximately 1.0 and roughly equal values of energy in the longitudinal and transverse components of motion. The beam front propagates at velocities considerably slower than the main portion of the beam and work done by the induced electric field, due to the initial current rise, contributes to energy loss. Time-dependent measurements of net and primary current have been correlated with a diffusion dominated model of current neutralization, the key parameters in this model being the risetime of the primary current, the avalanche breakdown time of the gas, and the plasma conductivity after breakdown. Beam manipulation experiments, such as shaping, splitting and recombination, and attempts to form an electron ring are also reported. Author
- Particle Accelerators