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Yang, M.-J.

Paper Title Page
TUPAS010 Studies of Beam Properties and Main Injector Loss Control using Collimators in the Fermilab Booster to Main Injector Transfer Line 1670
  • B. C. Brown, P. Adamson, D. Capista, D. E. Johnson, I. Kourbanis, D. K. Morris, M.-J. Yang
    Fermilab, Batavia, Illinois
  Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC02-76CH03000.

High intensity operation of the Fermilab Main Injector has resulted in increased activation of machine components. Efforts to permit operation at high power include creation of collimation systems to localize losses away from locations which require maintenance. As a first step, a collimation system to remove halo from the incoming beam was installed in the Spring 2006 Facility Shutdown*. We report on commissioning studies and operational experience including observations of Booster beam properties, effects on Main Injector loss and activation, and operational results.

* B. C. Brown, et al., "Collimation System for the Fermilab Booster to Main Injector Transfer Line", this conference.

TUPAS015 Operational Aspects of the Main Injector Large Aperture Quadrupole 1685
  • W. Chou, C. L. Bartelson, B. C. Brown, D. Capista, J. L. Crisp, J. DiMarco, J. Fitzgerald, H. D. Glass, D. J. Harding, B. Hendricks, D. E. Johnson, V. S. Kashikhin, I. Kourbanis, W. F. Robotham, T. Sager, M. Tartaglia, L. Valerio, R. C. Webber, M. Wendt, D. Wolff, M.-J. Yang
    Fermilab, Batavia, Illinois
  Funding: Work supported by Universities Research Association, Inc. under contract No. DE-AC02-76CH03000 with the U. S. Dept. of Energy.

A two-year Large Aperture Quadrupole (WQB) Project was completed in the summer of 2006 at Fermilab.* 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**.

* D. Harding et al, "A Wide Aperture Quadrupole for the Fermilab Main Injector," this conference.
** W. Chou, Fermilab Beams-doc-#2479, http://beamdocs.fnal.gov/AD-public/DocDB/DocumentDatabase

THPAN116 Lattice Measurement for Fermilab Main Injector 3498
  • M.-J. Yang
    Fermilab, Batavia, Illinois
  The installation of seven large aperture quadrupoles during the shut-down of 2006 necessitates new measurements to ascertain the state of machine lattice, both at injection and at extraction. These new quadrupoles replaced existing quadrupoles at each of the seven injection/extraction locations around the Fermilab Main Injector. Though extensive magnet measurement had been made the effect of trim coils used to compensate differences in magnet characteristics has to be verified. The result of lattice analysis and others will be discussed.  
FRPMS016 A BPM Calibration Procedure using TBT Data 3928
  • M.-J. Yang, J. L. Crisp, P. S. Prieto
    Fermilab, Batavia, Illinois
  Accurate BPM calibration is important in most lattice analysis. This paper describes a procedure developed as a logical extension of TBT data lattice analysis to extract relative calibration between BPMs in the machine. The method has been applied previously to the Recycler Ring and recently to Main Injector at Fermilab with amazing success. The results will be presented. The BPM position resolution is crucial to the procedure and will also be addressed.  
FRPMS017 Magnetic Error Analysis of Recycler Pbar Injection Transfer Line 3934
  • M.-J. Yang
    Fermilab, Batavia, Illinois
  Detailed study of Fermilab Recycler Ring pbar injection transfer line became feasible with recent completion of BPM system upgrades, which includes its up-stream machine, the Main Injector. Data was taken both with proton during dedicated study and with pbar during regular beam transfer, in the opposite direction. The two Lambertson magnets on either end of transfer line have been identified as having substantial amount of error field. Using harmonic orbit decomposition the error fields were mapped and results are presented.