Plasma-focused cyclic accelerators

Conference · Tue Oct 01 04:00:00 EDT 1985 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:5948678

Mondelli, A A; Chernin, D P

The use of ambient plasma to neutralize the transverse forces of an intense particle beam has been known for many years. Most recently, the so-called ion-focused regime (IFR) for beam propagation has been used as a means of focusing intense electron beams in linear accelerators and suggested for injecting an electron beam across magnetic field lines into a high-current cyclic accelerator. One technique for generating the required background plasma for IFR propagation is to use a laser to ionize ambient gas in the accelerator chamber. For cyclic accelerators a technique is required for carrying the plasma channel and the beam around a bend. Multiple laser-generated channels with dipole magnetic fields to switch the beam from one channel to the next have been tested at Sandia. This paper discusses an alternative means of plasma production for IFR, viz. by using rf breakdown. For this approach the accelerator chamber acts as a waveguide. With a suitable driving frequency, a waveguide mode can be driven which has its peak field intensity on the axis with negligible fields at the chamber walls. The plasma production and hence the beam propagation is thereby isolated from the walls. This technique is not limited to toroidal accelerators. It may be applied to any accelerator or recirculator geometry as well as for beam steering and for injection or extraction of beams in closed accelerator configurations.

• Research Organization: Science Applications International Corporation, McLean, VA
• OSTI ID: 5948678
• Report Number(s): CONF-850504-
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci.; (United States) Journal Volume: NS-32:5
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430200 -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
430303* -- Particle Accelerators-- Experimental Facilities & Equipment
ACCELERATORS
BEAM BENDING MAGNETS
BEAM TRANSPORT
BEAMS
CYCLIC ACCELERATORS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELECTRON BEAMS
EQUIPMENT
LASERS
LEPTON BEAMS
MAGNETS
NATIONAL ORGANIZATIONS
OPEN PLASMA DEVICES
PARTICLE BEAMS
PLASMA FOCUS DEVICES
PLASMA PRODUCTION
SANDIA LABORATORIES
THERMONUCLEAR DEVICES
US AEC
US DOE
US ERDA
US ORGANIZATIONS