RF impedance studies of a beam chamber and longitudinally slot-coupled vacuum pumping antechamber

Conference · Thu Jan 01 00:00:00 EST 1987

OSTI ID:6081104

Kustom, R L; Nicholls, G L; Kramer, S L; Khoe, T K; Cook, J M

The storage ring vacuum chamber of the proposed 7-GeV synchrotron light source at Argonne National Laboratory is planned to have a semi-elliptical beam chamber, with a longitudinal slot coupled to an antechamber containing NEG pumping strips. Concern over the RF impedance of this complex chamber has stimulated the need to understand the limitations it will have on the beam intensity, the RF acceleration system and on the beam lifetime. Calculations using numerical EM field programs have estimated the waveguide modes of this chamber and the impedance and loss parameter for the expected 1 to 2 cm beam bunch length. The loss parameter is shown to differ little from an elliptical beam chamber without the slot and antechamber. An experimental program has begun to verify the estimates of the impedance for these complex vacuum chamber components using laboratory methods. Preliminary results are presented for the measured loss parameter for a short length of beam vacuum chamber and for other components. These results are compared with their calculated values.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6081104
• Report Number(s): ANL-HEP-CP-87-19; CONF-870302-225; ON: DE87011538
• Resource Relation: Conference: Particle accelerator conference, Washington, DC, USA, 16 Mar 1987; Other Information: Paper copy only, copy does not permit microfiche production
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
SYNCHROTRON RADIATION SOURCES
VACUUM SYSTEMS
IMPEDANCE
BEAM BUNCHING
COMPUTER CALCULATIONS
EXPERIMENTAL DATA
GETTERS
MEASURING METHODS
RF SYSTEMS
WAVEGUIDES
BEAM DYNAMICS
DATA
INFORMATION
NUMERICAL DATA
RADIATION SOURCES
430303* - Particle Accelerators- Experimental Facilities & Equipment
430200 - Particle Accelerators- Beam Dynamics
Field Calculations
& Ion Optics