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.

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 40pi to 60pi mm-mrad. This paper gives a brief report of the operation and performance of these magnets. Details can be found in Ref [2].

A second and third modulator are being built at Fermilab to drive the klystrons for the TESLA Test Facility. These modulators are similar to one previously built at Fermilab. However, there are two differences. First, the new modulators are designed for a 10 MW multi-beam klystron under design by Thomson. Second, IGBT switches are being used in place of GTOs. The development of the series IGBT switch to replace the GTO switch is the most significant challenge. IGBTs have the advantages of lower gate drive and shorter turn off delay time.

The Fermilab Main Injector (FMI) 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 30 kHz switching frequency and are rated for +/-150 Volts and +/-15 Amps at 95 percent switching duty cycle and 95 percent efficiency into a 1 Henry magnet load. The FMI 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 RMS.

In order to increase the usable accelerating gradient in Superconducting TESLA cavities, the field emission threshold barrier must be raised. As has been previously demonstrated on S-Band cavities, a way to accomplish this is with the use of high peak power RF processing. A transmitter with a peak power of 2 MWatt and 300 /spl mu/sec pulse length has been assembled and has been used to process TESLA cavities. Several five cell TESLA cavities at 1.3 GHz have been manufactured for this purpose. This transmitter and the cavities will be described and the results of the tests will be presented.<>

A novel modulator has been designed, built and tested for the TESLA test facility. This e{sup +} e{sup {minus}} accelerator concept uses superconducting RF cavities and requires 2ms 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 used a modest size switched capacitor bank that droops approximately 20% during the pulse. This large droop is compensated 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 GTO switch. The resonant circuit is connected to the low side of the pulse transformer primary. The output pulse is flat to within 1% 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%.

Fermilab is updating the linac by replacing one-half of the system in order to double the beam energy. Quadrapole magnets are used to focus the proton beam as it travels through the linac. This paper describes the power supply used to drive the magnets. The pulsed quadrapole supply generates a 2 ms half sine wave pulse flat on top for 450 μs within +/-0.2% of the maximum current of 200 amps. The flattop is achieved by a third harmonic circuit added to the resonant discharge circuit. Charge recovery is included in this system with >70% being recovered. A total of four pulsers are powered from one main supply. Remote control systems are used to operate, send, and receive data. Each pulser unit common floats for minimum noise transmission. Safety and minimum noise transmission were factors included in the design of the complete system

An upgraded system of pulseed switching magnets has been implemented in the Fermilab Switchyard to accommodate proton energies up to 1 TeV. These devices are required for switching the ''slow'' and ''fast'' extracted beams into their respective beam lines. ''Slow'' beam passes undeflected through the magnet in the off condition. During a puls ''slow'' is disabled and ''fast'', which is of approx.1 ms duration, is deflected. The requirement then is for a ''flat-top'' current pulse of minimum rise and fall time. The circuit chosen is of the resonant charge recovery type. Several different styles and combinations of magnets and constraints. In all cases maximum voltage is limited to 600 volts and pulse width to 100 ms.

The vacuum system consists of three different systems, each with its own particular characteristics and requirements: The cryostat insulating vacuum which is completely separate from the two following systems (2) cold beam tube, vacuum sections in which the beam tube is at cryogenic temperature (3) warm beam tube, vacuum sections in which the beam tube is at room temperature.