Proton ring trapping in a gated magnetic mirror

Pedrow, P. D.; Greenly, J. B.; Hammer, D. A.; Sudan, R. N.
August 1985
Applied Physics Letters;8/1/1985, Vol. 47 Issue 3, p225
Academic Journal
An axis-encircling proton ring has been trapped for times (≈ 4 µs) much longer than the ion cyclotron period (≈ 80 ns). The rings, with mean radius 10 cm and with particle energies ≤430 keV, made eight passes through the 1.5-m-long magnetic mirror well with static and puffed hydrogen used for space-charge neutralization. The measured proton inventory was typically 2 × 10[sup 15] protons during the first pass and 2 × 10[sup 13] protons during the eighth and final pass. With a central solenoidal field of 0.8 T, the peak diamagnetism and azimuthal current density of the injected ring were typicality 10 mT (100 G) and 10 A/cm², respectively.


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