A novel modulator has been designed, built and tested for the TESLA test facility.This e+ eaccelerator concept uses superconducting RF cavities and requires 2 ms of RF power at 10 pps. As the final accelerator will require several hundred modulators, a cost effective, space saving and high efficiency design IS desired. This modulator uses a modest size switched capacitor bank that droops approximately 20% during the pulse. This large droop is compcns;~ted for by the use of a resonant LC circuit. The capacitor bank is connected to the high side of a pulse transformer primary using a series CT0 switch. The resonant circuit is connected to the low side of the pulse transformer primary. The output pulse is flat to within I% for 1.9 ms during a 2.3 ms base pulse width. Measured efficiency, from breaker to klystron and including energy lost in the rise time, is approximately 85%.

A two-year Large Aperture Quadrupole (WQB) Project was completed in the summer of 2006 at Fermilab. [1] Nine WQBs were designed, fabricated and bench-tested by the Technical Division. Seven of them were installed in the Main Injector and the other two for spares. They perform well. The aperture increase meets the design goal and the perturbation to the lattice is minimal. The machine acceptance in the injection and extraction regions is increased from 40π to 60π mm-mrad. This paper gives a brief report of the operation and performance of these magnets. Details can be found in Ref [2].

During the design of the Fermilab Main Injector synchrotron it was recognized that the aperture was limited at the beam transfer and extraction points by the combination of the Lambertson magnets and the reused Main Ring quadrupoles located between the Lambertsons. Increased intensity demands on the Main Injector from antiproton production for the collider program, slow spill to the meson fixed target program, and high intensity beam to the high energy neutrino program have led us to replace the aperture-limiting quadrupoles with newly built magnets that have the same physical length but a larger aperture. The magnets run on the main quadrupole bus, and must therefore have the same excitation profile as the magnets they replaced. We present here the design of the magnets, their magnetic performance, and the accelerator performance.

The Fermilab Main Injector (Fh4I) will require 248 ramped corrector power supplies for the operation of the accelerator. The design and prototype test results will be described in this paper. The 3 main design goals for these supplies are: 1) eliminate failure due to thermal fatigue that has plagued similar systems at FNAL, 2) utilize PWM technology to attain good efficiency and small size, and 3) minimize conducted and radiated noise typically generated by PWM systems. The power supplies operate at 30kHz switching frequency and are rated for +/-150 Volts and +/-15 Amps at 95 percent switchlng duty cycle and 95 percent efficiency into a 1 Henry magnet load. The Fh4I requirements call for a ramp cycle of 1 -2 seconds. During the cycle, the maximum temperature swing, junction to heat sink, of the power components is less than 30 degrees centigrade. The output voltage ripple is less than 1 Volt Rh4S.

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