RF MODES IN THE PEP-II SHIELDED VERTEX BELLOWS

Technical Report · Tue Jun 10 00:00:00 EDT 2003

DOI:https://doi.org/10.2172/813229· OSTI ID:813229

Novokhatski, Alexander

Experimental and simulation study of RF modes were carried out for the complicated geometry of the shielded vertex bellows near the IP region of the PEP-II B-factory. A beam position monitor button electrode located 50 cm from the bellows provides a signal for spectrum measurement. Calculations indicate monopole, dipole and quadrupole modes can exist in the bellows structure near the experimentally observed frequency region of 5 GHz. The observed modes are correlated to the bellows heating. The beam-generated fields are scattered by the masks, taper and axial offsets and heat the bellows by coupling through the RF shield fingers.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Science (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 813229
• Report Number(s): SLAC-PUB-9952; TRN: US0303763
• Resource Relation: Other Information: PBD: 10 Jun 2003
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM POSITION
DIPOLES
ELECTRODES
BEAM MONITORS
QUADRUPOLES
SHIELDS
COMPUTERIZED SIMULATION
RF SYSTEMS
PEP STORAGE RINGS
BELLOWS