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Blowers, J.N.

Paper Title Page
MPPT051 Reshimming of Tevatron Dipoles; A Process-Quality and Lessons-Learned Perspective 3156
 
  • J.N. Blowers, R. Hanft, D.J. Harding, J.A. John, W.F. Robotham
    Fermilab, Batavia, Illinois
  
  Funding: Work supported by the U.S. Department of Energy under Contract No. DE-AC02-76CH03000.

Over the last two years corrections have been made for the skew quadrupole moment in 530 of the 774 installed dipoles in the Tevatron. This process of modifying the magnets in situ has inherent risk of degrading the performance of the superconducting accelerator. In order to manage the risk, as well as to ensure the corrections were done consistently, formal quality tools were used to plan and verify the work. The quality tools used to define the process and for quality control are discussed, along with highlights of lessons learned.

 
MPPT053 Restoring the Skew Quadrupole Moment in Tevatron Dipoles 3244
 
  • D.J. Harding, P. Bauer, J.N. Blowers, J. DiMarco, H.D. Glass, R. Hanft, J.A. John, W.F. Robotham, M. Tartaglia, J. Tompkins, G. Velev
    Fermilab, Batavia, Illinois
  
  Funding: Work supported by the U.S. Department of Energy under Contract No. DE-AC02-76CH03000.

In early 2003 it was realized that mechanical changes in the Tevatron dipoles had led to a deterioration of the magnetic field quality that was hindering operation of the accelerator. After extensive study, a remediation program was started in late 2003 which will continue through 2005. The mechanical and magnetic effects are discussed. The readjustment process and experience are reported, along with other observations on aging magnets.