Author: Hartzell, J.J.
Paper Title Page
THPIK128 Switching Magnet for Heavy-Ion Beam Separation 4403
 
  • J.J. Hartzell, R.B. Agustsson, S.V. Kutsaev, A. Laurich, A.Y. Murokh, F.H. O'Shea, T.J. Villabona
    RadiaBeam, Santa Monica, California, USA
  • G. Leyh
    LOD, Brisbane, USA
  • E.A. Savin
    RadiaBeam Systems, Santa Monica, California, USA
 
  Funding: This work was supported by the United States Department of Energy SBIR Grant No. DE-SC0015124.
We present a design for a complete switching magnet system capable of deflecting 8-25 MeV/u heavy-ion beams by 10 degrees. The system can produce flat-top pulses from 1 to 30 ms with rise and fall times of less than 0.5 ms at a duty cycle of 3-91% into a heavily inductive load. As determined by physics needs, the operational parameters of this magnet place it between fast rising kicker magnets with short duration and slow rising (or DC) resistive magnets which are optimized for efficiency and current-based power loss. This magnet must operate efficiently with over 91% duty factor and have a modestly fast rise time. The resulting design uses a resistive magnet scheme, to optimize the current-based losses, that is pulsed using a new circuit to control the applied voltage. The magnet has a laminated, iron dominated, H-shaped core. Directly-cooled copper pancake coils energize the magnet. The modulator employs a novel, proprietary, over-voltage topology to overcome the inherent inductance and achieve the fast rise and fall times, switching to a precision DC supply to efficiently maintain the flattop without requiring voltage in excess of ±3 kV.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK128  
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THPVA146 Robust Linac Platform for Wide Replacement of Radioactive Sources 4805
 
  • A.V. Smirnov, M.A. Harrison, A.Y. Murokh, A.Yu. Smirnov
    RadiaBeam Systems, Santa Monica, California, USA
  • R.B. Agustsson, S. Boucher, T.J. Campese, J.J. Hartzell, K.J. Hoyt
    RadiaBeam, Marina del Rey, California, USA
  • E.A. Savin
    MEPhI, Moscow, Russia
 
  Funding: This work was supported by the U.S. Department of Energy (awards No. DE-SC-FOA-0011370).
To improve public security and prevent the diversion of radioactive material for Radiation Dispersion Devices, development of an inexpensive, portable, easy-to-manufacture linac system is very important. Tubular structure with parallel pairs of rods crossed at 90 degrees suggests as high as 36% inter-cell coupling due to inherent compensation along with still substantial shunt impedance. Simultaneously it offers simplified brazing process and may dramatically simplify tuning of the entire structure. A novel design of a multi-cell, single-section, X-band structure for replacement of Ir192 source is presented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA146  
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THPVA147 KlyLac Conceptual Design for Borehole Logging 4808
 
  • A.V. Smirnov, S. Boucher, M.A. Harrison, A.Y. Murokh
    RadiaBeam Systems, Santa Monica, California, USA
  • R.B. Agustsson, D. Chao, J.J. Hartzell, K.J. Hoyt, A.Yu. Smirnov
    RadiaBeam, Santa Monica, California, USA
  • E.A. Savin
    MEPhI, Moscow, Russia
 
  Funding: This work was supported by the U.S. Department of Energy (award No. DE-SC0015721).
Linac-based system for borehole logging exploits KlyLac approach combing klystron and linac sharing the same electron beam, vacuum volume, and RF net-work. The conceptual design tailors delivering 3.5-4 MeV electrons within 3.5 inch borehole at ambient temperatures 150 degrees C to replace 137Cs, >1 Ci source used in borehole logging. The linac part is based on a very robust, high group velocity, cm-wave, standing wave accelerating structure. The design concept features i) self-oscillation analog feedback that automatically provides modal stability; ii) ferrite-free isolation of the klystron; and iii) long accelerating section with large (0.3%) frequency separation between adjacent modes; and iv) low-voltage klystron.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA147  
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