The CEBAF RF Separator System Upgrade

Conference · Sun Aug 01 04:00:00 EDT 2004

OSTI ID:827523

Hovater, J; Augustine, Mark; Guerra, Al; Nelson, Richard; Terrell, Robert; Wissmann, Mark

The CEBAF accelerator uses RF deflecting cavities operating at the third sub-harmonic (499 MHz) of the accelerating frequency (1497 MHz) to ''kick'' the electron beam to the experimental halls. The cavities operate in a TEM dipole mode incorporating mode enhancing rods to increase the cavity's transverse shunt impedance [1]. As the accelerators energy has increased from 4 GeV to 6 GeV the RF system, specifically the 1 kW solid-state amplifiers, have become problematic, operating in saturation because of the increased beam energy demands. Two years ago we began a study to look into replacement for the RF amplifiers and decided to use a commercial broadcast Inductive Output Tube (IOT) capable of 30 kW. The new RF system uses one IOT amplifier on multiple cavities as opposed to one amplifier per cavity as was originally used. In addition, the new RF system supports a proposed 12 GeV energy upgrade to CEBAF. We are currently halfway through the upgrade with three IOTs in operation and the remaining one nearly installed. This paper reports on the new RF system and the IOT performance.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 827523
• Report Number(s): JLAB-ACE-04-253; DOE/ER/40150-2827
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
AMPLIFIERS
BYPASSES
CAVITIES
CEBAF ACCELERATOR
DIPOLES
ELECTRON BEAMS
ENERGY DEMAND
IMPEDANCE
LINEAR ACCELERATORS
PERFORMANCE
RF SYSTEMS
SATURATION