𝔖 Bobbio Scriptorium
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Long plasma source for heavy ion beam charge neutralization

✍ Scribed by Philip C. Efthimion; Erik P. Gilson; Larry Grisham; Ronald C. Davidson; Larry B. Grant Logan; Peter A. Seidl; William Waldron

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
444 KB
Volume
606
Category
Article
ISSN
0168-9002

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✦ Synopsis

Plasmas are a source of unbound electrons for charge neutralizing intense heavy ion beams to focus them to a small spot size and compress their axial length. The plasma source should operate at low neutral pressures and without strong externally applied fields. To produce long plasma columns, sources based upon ferroelectric ceramics with large dielectric coefficients have been developed. The source utilizes the ferroelectric ceramic BaTiO 3 to form metal plasma. The drift tube inner surface of the Neutralized Drift Compression Experiment (NDCX) is covered with ceramic material. High voltage ($8 kV) is applied between the drift tube and the front surface of the ceramics. A BaTiO 3 source comprised of five 20-cm-long sources has been tested and characterized, producing relatively uniform plasma in the 5 Γ‚ 10 10 cm Γ€3 density range. The source was integrated into the NDCX device for charge neutralization and beam compression experiments, and yielded current compression ratios $120. Present research is developing multi-meter-long and higher density sources to support beam compression experiments for high-energy-density physics applications.

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