SDR, EVC, and SDREVC: Limitations and Extensions

Jun 1, 2023
Published in:
  • J.Plasma Phys. 89 (2023) 5, 955890501
  • Published: Oct 31, 2023
e-Print:
Report number:
  • CERN-EP-2023-102
Experiments:

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Abstract: (Cambridge University Press)
Methods for reducing the radius, temperature and space charge of a non-neutral plasma are usually reported for conditions which approximate an ideal Penning Malmberg trap. Here, we show that (i) similar methods are still effective under surprisingly adverse circumstances: we perform strong drive regime (SDR) compression and SDREVC in a strong magnetic mirror field using only 3 out of 4 rotating wall petals. In addition, we demonstrate (ii) an alternative to SDREVC, using e-kick instead of evaporative cooling (EVC) and (iii) an upper limit for how much plasma can be cooled to T<20 KT<20\ \mathrm {K} using EVC. This limit depends on the space charge, not on the number of particles or the plasma density.
Note:
  • Version 2: a small discrepancy between the N values for Table 1 and Fig. 3 led to an investigation of the charge counting diagnostic. There is a small energy dependence which only became apparent following improvements to pre-SDREVC. The pulsed dump was modified to reduce this dependence. The data for Table 1 and Fig. 3 was taken again with the improved methods
  • plasma properties