SDR, EVC, and SDREVC: Limitations and Extensions
Jun 1, 2023Published in:
- J.Plasma Phys. 89 (2023) 5, 955890501
- Published: Oct 31, 2023
e-Print:
- 2306.00862 [physics.plasm-ph]
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 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
References(59)
Figures(7)
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