Author: Kahn, S.A.
Paper Title Page
THPAB090 Algorithm to Calculate Off-Plane Magnetic Field From an on-Plane Field Map 3928
 
  • N. Tsoupas, J.S. Berg, F. Méot, V. Ptitsyn, D. Trbojevic
    BNL, Upton, Long Island, New York, USA
  • S.A. Kahn
    Muons, Inc, Illinois, USA
  • S. Machida
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
We present an algorithm to calculate the off-plane components of the magnetic field from the on-plane components of the magnetic field which are measured on a grid of the plane. The algorithm, which is a general one and it is not restricted on a mid-plane symmetry, is based on the Taylor series expansion of the magnetic field components in terms of the normal to the plane location. The coefficients of the Taylor series expansion are expressed in terms of the on-plane derivatives of the field components which are generated by the measured magnetic field components on the grid of the plane. The algorithm is use in the RATRACE computer code[*] and has been used[**] on a dipole magnet with median plane symmetry.
* S.B. Kowalski and H.A. Enge The Ion-Optical Program Raytrace NIM A258 (1987) 407
** N. Tsoupas et. al. Effects of Dipole Magnet Inhomogeneity on the Beam Ellipsoid NIM A258 (1987) 421-425
 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB090  
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THPIK121 Eddy Current Analysis for a 1.495 GHz Injection-Locked Magnetron 4383
 
  • S.A. Kahn, A. Dudas, R.P. Johnson, M.L. Neubauer
    Muons, Inc, Illinois, USA
  • R.A. Rimmer, H. Wang
    JLab, Newport News, Virginia, USA
  
  Funding: U.S. DOE SBIR/STTR grant DE-SC0013203
An injection-locked amplitude modulated magnetron is being developed as a reliable, efficient RF source that could replace klystrons used in particle accelerators. A trim magnetic coil is used to alter the magnetic field in conjunction with the anode voltage to maintain an SRF cavity voltage while the cavity is experiencing microphonics and changing beam loading. The microphonic noise modes have frequencies in the range 10-100 Hz. The changing magnetic field will induce transient eddy currents in the copper anode of the magnetron which will buck the field in the interaction region. This paper will describe the calculation and handling of the eddy currents in the magnetron. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK121  
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THPIK123 Magnetron Design for Amplitude Modulation 4389
 
  • M.L. Neubauer, A. Dudas, S.A. Kahn
    Muons, Inc, Illinois, USA
  • R.A. Rimmer, H. Wang
    JLab, Newport News, Virginia, USA
  
  The amplitude modulation (AM) of a magnetron is accomplished by varying the magnetic field which changes the current to the anode and the output power of the injection locked magnetron. The purpose of the AM is to compensate for microphonics in super conducting cavities by maintaining a constant gradient. The frequency range for the microphones is below 200 Hz. At these frequencies, eddy currents are encountered in the magnetron anode that reduce the effectiveness of the varying magnetic field on the magnetron current. A novel anode design is described which minimizes eddy currents and a method for manufacturing this novel magnetron anode is presented  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK123  
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