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Johnson, D.E.

Paper Title Page
TU6PFP059 Numerical Studies of High-Intensity Injection Painting for Project X 1418
 
  • A.I. Drozhdin, D.E. Johnson, L.G. Vorobiev
    Fermilab, Batavia
  
 

Injection painting enables the mitigation of space charge and stability issues, and may be indispensable for the Project-X at Fermilab, delivering high-intensity proton beams to HEP experiments. Numerical simulations of multi-turn phase space painting have been performed for the FNAL Recycler Ring, including a self-consistent space charge model, lattice nonlinearities, H- stripping, particle loss and foil heating. Different painting waveforms were studied to build a uniform (KV-like distribution) and other phase space distributions.

  
TU6RFP028 Laser Stripping for the PS2 Charge-Exchange Injection System 1596
 
  • B. Goddard, W. Bartmann
    CERN, Geneva
  • V.V. Danilov
    ORNL, Oak Ridge, Tennessee
  • D.E. Johnson
    Fermilab, Batavia
  
 

Laser stripping for an H- injection system into the proposed PS2 accelerator could provide an attractive alternative to the use of a conventional stripping foil. In this paper possible concepts for a 4 GeV laser stripping system are outlined and compared, using either laser or magnetic initial stripping steps and a resonant excitation of the intermediate H0 atom, followed by a final magnetic stripping. Issues of laser power, overall efficiency and emittance growth are discussed.

  
WE6RFP025 Fermilab Main Injector Collimation Systems: Design, Commissioning and Operation 2841
 
  • B.C. Brown, P. Adamson, D. Capista, A.I. Drozhdin, D.E. Johnson, I. Kourbanis, N.V. Mokhov, D.K. Morris, I.L. Rakhno, K. Seiya, V.I. Sidorov, G.H. Wu, M.-J. Yang
    Fermilab, Batavia
  
 

Funding: Work supported by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy


The Fermilab Main Injector is moving toward providing 400 kW of 120 GeV proton beams using slip stacking injection of eleven Booster batches. Loss of 5% of the beam at or near injection energy results in 1.5 kW of beam loss. A collimation system has been implemented to localize this loss with the design emphasis on beam not captured in the accelerating rf buckets. More than 90% of these losses are captured in the collimation region. We will report on the construction, commissioning and operation of this collimation system. Commissioning studies and loss measurement tools will be discussed. Residual radiation monitoring of the Main Injector machine components since 2004 will be used to demonstrate the effectiveness and limitations of these efforts.