CERN, Geneva
TRIUMF, Vancouver
The International Linear Collider (ILC) requires ultra fast kickers for the damping ring. One option requires kickers which must produce pulses of 5 kV magnitude, with 6 ns rise and 6 ns fall time into a 50 Ohm, terminated, matched stripline deflector. The pulse must rise and fall within 12 ns. The pulse magnitude must be repeatable to a high accuracy. This paper describes a novel design for a suitable pulse generator for the damping ring kicker, in which 2 stacks of 1kV FETS are combined to generate the fast pulses. The design concept uses 2 parallel 100 Ω drivers combined to provide a 50 Ω driver. The need for 3 MHz burst mode operation for 1 ms at 5 Hz (or 10 Hz) gives an average rep rate of 15 kHz (or 30 kHz). Measurements and calculations are presented on the present state of the TRIUMF prototype pulse generator.
CERN, Geneva
TRIUMF, Vancouver
The present AGS injection kickers at A5 location were designed for 1.5 GeV proton injection. Recent high intensity runs have pushed the transfer kinetic energy to 1.94 GeV, but with an imperfect matching in transverse phase space. Space charge forces result in both fast and slow beam size growth and beam loss as the size exceeds the AGS aperture. An increase in the AGS injection energy to 2 GeV with adequate kick strength would greatly reduce the beam losses making it possible to increase the intensity from 70 TP (70 * 1012 protons/s) to 100 TP. R&D studies* have been undertaken by TRIUMF, in collaboration with BNL, to design two new kicker magnets for the AGS A10 location to provide an additional kick of 1.5 mrad to 2 GeV protons. TRIUMF has designed and built a prototype 12.5 Ω transmission line kicker magnet with rise and fall times of 100 ns, 3% to 97% and field uniformity of (±)1% over 85% of the aperture, powered by matched 12.5 Ω pulse-forming lines. This paper describes the results of detailed capacitance and inductance measurements, on the prototype magnet, and compares these with predictions from 2D and 3D electromagnetic simulations.
*L. Ahrens, R. B. Armenta, M. J. Barnes, E. W Blackmore, C. J. Gardner, O. Hadary, G. D. Wait, W. Zhang, "Design Concept for AGS Injection Kicker Upgrade to 2 GeV", PAC 2005, Knoxville Tennessee.