Title :
A 200-A, 500-Hz, triangle current-wave modulator and magnet used for particle beam rastering
Author :
Rose, C.R. ; Shafer, R.E.
Author_Institution :
Los Alamos Nat. Lab., NM, USA
Abstract :
This paper describes a simple 2D beam-rastering system to uniformly spread a 100-mA 6.7-MeV CW proton beam over a 50-cm by 50-cm beam stop. The basic circuit uses a 20-mF capacitor bank, a IGBT (insulated gate bipolar transistor) full-wave inverter, and a 1-mH ferrite dipole magnet to produce a ±500-Gauss peak triangular-waveform deflection field at 500 Hz. A DC input voltage of 200 volts at 2.6 amps (520 watts) produces a 160-ampere peak-to-peak triangular current waveform in the ferrite magnet at 500 Hz. For dual-axis rastering, two ferrite dipoles are used, one at 500 Hz, and the other at 575 Hz, to produce a uniform 2D beam distribution at the beam stop. The paper will discuss the IGBT modulator and ferrite deflector in detail, including current and voltage waveforms, and the ferrite magnet B-dot (dB/dt) signal
Keywords :
accelerator RF systems; accelerator magnets; beam handling techniques; electromagnets; insulated gate bipolar transistors; invertors; modulators; nuclear electronics; proton accelerators; proton beams; 100 mA; 160 A; 2.6 A; 20 mF; 200 V; 50 cm; 500 Hz; 500 gauss; 520 W; 575 Hz; 6.7 MeV; DC input voltage; IGBT modulator; beam stop; capacitor bank; dual-axis rastering; ferrite deflector; ferrite dipole magnet; full-wave inverter; insulated gate bipolar transistor; particle beam rastering; peak triangular-waveform deflection field; proton beam; triangle current-wave modulator; uniform 2D beam distribution; Capacitors; Ferrites; Frequency; Insulated gate bipolar transistors; Magnetic field measurement; Magnetic modulators; Optical modulation; Particle beams; Switches; System testing;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.750004
