Energy-loss of bunched beams in SSC (Superconducting Super Collider) RF cavities

Conference · Sun Mar 01 04:00:00 EST 1987

OSTI ID:6704899

Furman, M ^[1]; Lee, H ^[2]; Zotter, B ^[3]

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1. Lawrence Berkeley Lab., CA (USA). SSC Central Design Group
2. Los Alamos National Lab., NM (USA)
3. European Organization for Nuclear Research, Geneva (Switzerland). LEP Div.

A bunched beam that is accelerated by the fundamental resonant mode of RF cavities necessarily loses energy by exciting the higher-order modes of these very cavities. We consider here the calculation of the power lost by gaussian bunches traversing a structure with resonator impedance of arbitrary quality factor. Known formulas are used for the infinite summations, which reduce to other approximate ones for the broad-band case. For the narrow-band case we present a simple analytic expression. We apply our results to calculate the power lost to the higher-order modes of the SSC RF cavities. Our conclusion is that if the resonant frequencies of all higher-order modes of the cavities are sufficiently far from integral multiples of the bunch frequency, the energy loss is strongly reduced over that calculated by a simple broad-band model; but if this condition is not satisfied, then the resulting resonant loss for even a weak mode may be several orders of magnitude greater than the broad-band calculation. 8 refs.

• Research Organization: Lawrence Berkeley Lab., CA (USA). SSC Central Design Group
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-89ER40486
• OSTI ID: 6704899
• Report Number(s): SSC-116; CONF-870302--268; ON: DE90014560
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
BEAM BUNCHING
BEAM DYNAMICS
CALCULATION METHODS
CAVITY RESONATORS
ELECTRIC IMPEDANCE
ELECTRONIC EQUIPMENT
ENERGY LOSSES
EQUIPMENT
IMPEDANCE
LOSSES
RESONATORS
RF SYSTEMS
STORAGE RINGS
SUPERCONDUCTING SUPER COLLIDER