Higher order mode couplers for normal conducting DORIS 5-cell cavities
The beam intensity of the DORIS e -e storage ring is limited to about 100 mA average circulation current as a result of instabilities driven by higher order rf cavity modes. Thus an investigation has been made of the higher order mode impedances of the DORIS rf accelerator cavities. These cavities are the same as the normally conducting inductively coupled 500 MHz 5-cell structures used in PETRA. The results of the investigation were applied for the construction of inductive and capacitive attenuation antennae corresponding to specific mode spectra and mode impedances. The antennae must fit into the existing 35 mm pick up flanges of the cavities and in spite of these size and position limitations they must be efficient in reducing the shunt impedances of the dangerous modes.
- Research Organization:
- Deutsches Elektronen-Synchrotron DESY, Hamburg
- OSTI ID:
- 6297543
- Report Number(s):
- CONF-850504-; TRN: 86-004396
- Journal Information:
- IEEE Trans. Nucl. Sci.; (United States), Vol. NS-32:5; Conference: Particle accelerator conference, Vancouver, Canada, 13 May 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DORIS STORAGE RING
CAVITY RESONATORS
MODE CONTROL
ANTENNAS
BEAM DYNAMICS
COUPLING
ELECTRON BEAMS
MILLI AMP BEAM CURRENTS
POSITRON BEAMS
RF SYSTEMS
BEAM CURRENTS
BEAMS
CONTROL
CURRENTS
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
EQUIPMENT
LEPTON BEAMS
PARTICLE BEAMS
RESONATORS
STORAGE RINGS
430400* - Particle Accelerators- Storage Rings
430200 - Particle Accelerators- Beam Dynamics
Field Calculations
& Ion Optics
430303 - Particle Accelerators- Experimental Facilities & Equipment