HIF transport issues for p > 10/sup -3/ torr and Z > 1
Conference
·
OSTI ID:5550693
Final transport schemes for HIF are examined, with emphasis on transport for p > 10/sup -3/ Torr and Z > 1 since this should simplify the reactor design and reduce the length of the accelerator. Specifically the question of charge neutralization is addressed. We find (1) the fractional neutralization f/sub i/ needed scales as f/sub i/ = (1 - Z/sup -2/) which means f/sub i/ > 0.89 is needed for Z > 3; (2) axially-trapped electrons limit the net beam potential to ephi/sub min/ = ..cap alpha.. (1/2 m/sub e/v/sub i//sup 2/) with 1 less than or equal to ..cap alpha.. less than or equal to 4; (3) radially-expelled plasma ions increase f/sub i/, especially near the pellet; (4) radially-oscillating plasma electrons have an adiabatic limit of f/sub i/ = 0.5; and (5) as f/sub i/ approaches unity, plasma particle trajectories may involve drift motions along and radially away from the ion beam. Also, criteria are given for the maximum Z/A allowed for transporting very large currents. For the HIF parameters used, it appears that neutralization will probably be adequate for Z less than or equal to 3.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5550693
- Report Number(s):
- SAND-86-0776C; CONF-860510-8; ON: DE86012942
- Country of Publication:
- United States
- Language:
- English
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