THE RADIO FREQUENCY ACCELERATING SYSTEM FOR THE BROOKHAVEN ALTERNATING GRADIENT SYNCHROTRON

Journal Article · Fri Jan 01 04:00:00 EST 1960 · IRE Intern, Conv. Record

OSTI ID:4086443

Plotkin, M

The proton beam in the AGS is accelerated to its final energy of 30 Bev by means of a r-f accelerating system. The particles are injected into the machine at an energy of 50 Mev at which time they are traveling at one-third the velocity of light. At 30 Bev they are essentially moving with light velocity, necessitating an accelerating system which can stay in synchronism with the particles as their revolution frequency varies by a factor of three. The frequency range covered is 1.40 to 4.5 mc/sec. A low-level r-f system detects the correct frequency from the beam itself, corrects the phase so that the particles are accelerated properly and in turn drives a central driver amplifier. This unit is an eight-stage broad-band video amplifier capable of delivering an output of 80 kw. This driver feeds 12 accelerating stations, each consisting of a 25-kw push-pull amplifier and a tuned ferrite-loaded accelerating cavity. The cavity is kept continuously tuned by means of a saturating current used to vary the ferrite permeability. The saturating supply utilizes a transistor amplifier capable of delivering and controlling 1000 amp. It is a portion of a closed tuning loop which ensures that the load on the final amplifier is kept at resonance. Owing to the frequency change by a factor of three to one, it was necessary to develop a means to correct for the incremental phase shift inherent in the thousands of feet of coaxial cable required for the system. In addition, amplifiers had to be built which would automatically tune to a desired varying frequency in the output of a mixer circuit where the sum frequency difference frequency, and one of the input frequencies were all relatively close together. These circuits are described. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.; and Associated Universities, Inc., New York
• NSA Number: NSA-15-010188
• OSTI ID: 4086443
• Journal Information: IRE Intern, Conv. Record, Journal Name: IRE Intern, Conv. Record Vol. Vol: 8: Pt. 9
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AMPLIFIERS
BROOKHAVEN AGS
CABLES
CIRCUITS
CONTROL
CURRENTS
ENERGY RANGE
FERRITES
FREQUENCY
INJECTION
IRON OXIDES
PHYSICS
PLANNING
PROTON BEAMS
RADIO WAVES
RESONANCE
SYNCHROTRONS
TRANSISTORS
VELOCITY