Beam dynamics of RF devices to improve the efficiency of proposed H/sub -/ extraction from TRIUMF

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

OSTI ID:6111816

Laxdal, R E; Mackenzie, G M

Future developments at TRIUMF would benefit from the direct extraction of H/sup -/ ions in addition to the present stripping extraction of protons. The radial beam density at the first extractor septum must be reduced to achieve 90% extraction efficiency of a 100 ..mu..A, 450 MeV beam. Two methods have been considered. Installation of RF booster cavities could triple the energy gain/turn at the septum radius. Alternatively a radial RF field at ..nu.. /SUB r/ =3/2 could generate a coherent betatron oscillation. The subsequent precession could produce local density minima 20% of the average. The beam dynamics for both methods have been investigated using a simple analytic model and a general orbit code. The booster cavities introduce phasedependent radial and vertical forces (the former leading to phase compression) that may render the motion of some phases unstable. Large coherent oscillations may be unstable near the resonance. Operating tolerances are specified and successful test results of the second scheme are presented.

• Research Organization: TRIUMF, Vancouver, BC
• OSTI ID: 6111816
• 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
ACCELERATORS
ANIONS
BEAM CURRENTS
BEAM DYNAMICS
BEAM EXTRACTION
BEAMS
CHARGED PARTICLES
CURRENTS
CYCLIC ACCELERATORS
CYCLOTRONS
EFFICIENCY
ENERGY RANGE
HYDROGEN 1 MINUS BEAMS
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
ION BEAMS
IONS
ISOCHRONOUS CYCLOTRONS
MEV RANGE
MEV RANGE 100-1000
MICRO AMP BEAM CURRENTS
TRIUMF CYCLOTRON