Ion focused transport experiments
We have developed a new technique for generating ionized channels for electrostatically guiding high current relativistic electron beams with ion focused transport (IFT). In IFT, beam electrons are electrostatically focused by a positive ion core left after the plasma electrons are ejected by the beam charge. The new method for channel formation allows beam transport over curved paths for applications in circular accelerators such as Sandia's recirculating linac, and also avoids the need for a uv laser. Our technique uses a low-energy electron beam to ionize a guiding channel in a low pressure gas. A weak longitudinal magnetic field is applied to confine and guide the low-energy beam, enabling one to precisely define the ionization channel. The steady state channel produced by this technique has been diagnosed using Langmuir probes. Channel density and radius were then optimized for beam guiding. Using this method we have efficiently guided relativistic beams with currents exceeding 20 kA over several meters and through a 90/sup 0/ bend. In these experiments with high nu/..gamma.. beams, we observed erosion and instabilities which can be important for accelerator applications. PIC simulations of IFT were performed and show stable propagation for high current beams passing through accelerating gaps. 10 refs., 6 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA); Mission Research Corp., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5814151
- Report Number(s):
- SAND-86-0045C; CONF-860629-13; ON: DE86011817
- Resource Relation:
- Conference: Linear accelerator conference, Stanford, CA, USA, 2 Jun 1986; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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