THE LINEAR ACCELERATOR INJECTOR FOR THE AGS

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

OSTI ID:4096284

Giordano, S

The linear accelerator that is described is to be used as a proton injector for the Brookhaven Alternating Gradient Synchrotron (AGS). The acceptance requirements of the AGS will therefore determine the specifications of the injection system. The injection system must supply a pulse of protons 7 mu long, having an energy of 50 Mev plus or minus 2% and an angular spread of less than approximately 2 milliradians; it should contain at least 10/sup 11/ protons. A cold cathode hydrogen discharge supplies the initial protons to be accelerated. The preinjector, which is a Cockcroft-Walton 5-stage d-c power supply, accelerates the protons to an energy of 750 kev. This 750-kev beam is then injected into a linear accelerator, where its energy is increased to 50 Mev. The linear accelerator is a cylindrical r-f structure approximately 90 cm in diameter and 33 m long. containing 124 drift tubes through which the beam must pass. To focus the proton beam, pulsed quadrupole magnets are located inside the drift tubes. To tune the linear accelerator to the proper mode and establish the correct field pattern, various tuning devices and pickup probes are included in the structure. The over-all structure must then be temperatare-controlled to within plus or minus 0.01 deg C. A 200-Mc-pulsed r-f source is used to excite the linear accelerator in a TM/sub 010/ mode. The r-f pulse has a peak power of 5 Mw, a width of 200 mu sec, and a repetition rate of 5 pps. The outputs of two separate amplifiers (each amplifier is a coaxial structure using a type TH 470 tube) are coupled together with a waveguide magic''T.'' The output arm of the - magic "T" is coupled to the linear accelerator with a 9-in. coaxial line. The linear accelerator can only accept protons during part of the r-f cycle. A buncher cavity is placed between the pre-injector and the linear accelerator, and its function is to pre-bunch the proton beam to match the en trance requirements of the linear accelerator. A debuncher is used at the output end of the linear accelerator to reduce the energy spread of the proton beam. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.; and Associated Universities, Inc., New York
• NSA Number: NSA-15-010187
• OSTI ID: 4096284
• 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
ANGULAR DISTRIBUTION
BROOKHAVEN AGS
CATHODES
CIRCUITS
COCKCROFT-WALTON ACCELERATORS
CONFIGURATION
CONTROL
DISTRIBUTION
ELECTRIC DISCHARGES
ENERGY
ENERGY RANGE
HYDROGEN
INJECTION
LINEAR ACCELERATORS
MAGNETS
MICROWAVES
OPTICAL SYSTEMS
PHYSICS
PLANNING
POWER
PROTON BEAMS
PULSES
SYNCHROTRONS
TEMPERATURE
WAVEGUIDES