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Ashmanskas, B.

Paper Title Page
MPPE022 Modification to the Lattice of the Fermilab Debuncher Ring To Improve the Performance of the Stochastic Cooling Systems 1799
 
  • G. Dugan
    Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
  • B. Ashmanskas
    Fermilab, Batavia, Illinois
 
  Funding: Supported by the Department of Energy and the National Science Foundation.

The Fermilab Debuncher is used to collect antiprotons from the production target, reduce the momentum spread of the beam by an RF bunch rotation, and stochastically cool the transverse and longitudinal emittances of the beam prior to transfer to the Accumulator. A large value of the slip factor of the ring lattice is favored to provide a larger momentum acceptance for the bunch rotation process, while a small value of the slip factor is desirable for stochastic cooling. A dynamic change in the lattice from a large slip factor at injection to a smaller slip factor at extraction would optimize both processes and could lead to an improvement in antiproton stacking rate. This paper discusses the details of lattice modifications to the Debuncher, achievable with the existing hardware, which would result in a 60% increase in the slip factor, while maintaining the tunes and chromaticities fixed, and keeping the betatron functions within an acceptable range.

 
MPPP015 Operational Performance of a Bunch by Bunch Digital Damper in the Fermilab Main Injector 1440
 
  • P. Adamson, P. Adamson
    UCL, London
  • B. Ashmanskas, G.W. Foster, S. U. Hansen, A. Marchionni, D.J. Nicklaus, A. Semenov, D. Wildman
    Fermilab, Batavia, Illinois
  • H. Kang
    Stanford University, Stanford, Califormia
 
  We have implemented a transverse and longitudinal bunch by bunch digital damper system in the Fermilab Main Injector, using a single digital board for all 3 coordinates. The system has been commissioned over the last year, and is now operational in all MI cycles, damping beam bunched at both 53MHz and 2.5MHz. We describe the performance of this system both for collider operations and high-intensity running for the NuMI project.  
RPAT009 FPGA-Based Instrumentation for the Fermilab Antiproton Source 1159
 
  • B. Ashmanskas, S. U. Hansen, T. Kiper, D.W. Peterson
    Fermilab, Batavia, Illinois
 
  We have designed and built low-cost, low-power, ethernet-based circuit boards to apply DSP techniques to several instrumentation upgrades in the Fermilab Antiproton Source. Commodity integrated circuits such as direct digital synthesizers, D/A and A/D converters, and quadrature demodulators enable digital manipulation of RF waveforms. A low cost FPGA implements a variety of signal processing algorithms in a manner that is easily adapted to new applications. An embedded microcontroller provides FPGA configuration, control of data acquisition, and command-line interface. A small commercial daughter board provides an ethernet-based TCP/IP interface between the microcontroller and the Fermilab accelerator control network. The board is packaged as a standard NIM module. Applications include Low Level RF control for the Debuncher, readout of transfer-line Beam Position Monitors, and narrow-band spectral analysis of diagnostic signals from Schottky pickups.