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Zhou, J. Z.

Paper Title Page
WEPMN119 Equilibrium Theory of an Intense Elliptic Beam for High-Power Ribbon-Beam Klystron Applications 2316
 
  • C. Chen, J. Z. Zhou
    MIT/PSFC, Cambridge, Massachusetts
 
  Funding: Research supported by US Department of Energy, Office of High-Energy Physics, Grant No. DE-FG02-95ER40919 and Air Force Office of Scientific Research, Grant No. FA9550-06-1-0269.

A concept for a high-power ribbon-beam klystron (RBK) employing a novel large-aspect ratio elliptic electron beam instead of a conventional circular electron beam is presented. Both cold-fluid and kinetic equilibrium theories are developed and applied in the design of the elliptic electron beam for the RBK. A small-signal theory is developed and applied in the design of the beam tunnel and the input, idler and output cavities. The electron gun and beam matching is being studied. Design results of a 10 MW 1.3 GHz RBK for the International Linear Collider (ILC) and of a 50 MW 22 GHz RBK for high-gradient research will be discussed.

 
WEPMN120 Photonic Band Gap Higher Order Mode Coupler for the International Linear Collider 2319
 
  • J. Z. Zhou, C. Chen, B. M. Kardon
    MIT/PSFC, Cambridge, Massachusetts
 
  Funding: Research supported by US Department of Energy, Office of High-Energy Physics, Grant No. DE-FG02-95ER40919 and Air Force Office of Scientific Research, Grant No. FA9550-06-1-0269.

A photonic band gap (PBG) higher-order-mode (HOM) coupler is proposed as an Alternative Configuration Design (ACD) for the HOM coupler for the International Linear Collider (ILC). The PBG HOM coupler uses a two-dimensional triangular PBG structure with good axial symmetry. Simulation studies of a PBG HOM coupler show that it maintains the operating mode at 1.3 GHz with . While a PBG HOM coupler provides superior damping for all the higher order modes in principle, detailed studies of the effectiveness of HOM damping are being carried out, and results will be discussed.

 
THPMS001 An Ideal Circular Charged-Particle Beam System 2999
 
  • T. Bemis
    BPT, Boston, Massachusetts
  • R. Bhatt, C. Chen, J. Z. Zhou
    MIT/PSFC, Cambridge, Massachusetts
 
  Funding: Research at Massachusetts Institute of Technology was supported by DOE, Office of High-Energy Physics, Grant No. DE-FG02-95ER40919 and AFOSR, Grant No. FA9550-06-1-0269.

A theory is presented for the design of an ideal non-relativistic circular beam system including a charged-particle emitting diode, a diode aperture, a circular beam tunnel, and a focusing magnetic field that matches the beam from the emitter to the beam tunnel. The magnetic field is determined by balancing the forces throughout the gun and transport sections of the beam system. OMNITRAK simulations are performed, validating theory. As applications, a circular electron beam system is discussed for space-charge-dominated beam experiments such as the University of Maryland Electron Ring (UMER), and a circular ion beam system is discussed for high energy density physics (HEDP) research.

 
THPAS028 Warm-Fluid Equilibrium Theory of an Intense Charged-Particle Beam Propagating through a Periodic Solenodal Focusing Channel 3558
 
  • K. R. Samokhvalova, C. Chen, J. Z. Zhou
    MIT/PSFC, Cambridge, Massachusetts
 
  Funding: Research supported by US Department of Energy, Office of High-Energy Physics, Grant No. DE-FG02-95ER40919 and Air Force Office of Scientific Research, Grant No. FA9550-06-1-0269.

A warm-fluid theory of a thermal equilibrium for a rotating charged particle beam in a periodic solenoidal focusing magnetic field is presented. The warm-fluid equilibrium equations are solved in the paraxial approximation. It is shown that the flow velocity for the thermal equilibrium corresponds to periodic rigid rotation and radial pulsation. The equation of state for the thermal equilibrium is adiabatic. The beam envelope equation and self-consistent Poisson's equation are derived. The numerical algorithm for solving self-consistent Poisson's equation is discussed. Density profiles are calculated numerically for high-intensity beams. Temperature effects in such beams are investigated, and the validity of the warm-fluid theory is discussed. Examples of electron and ion beams are presented for space-charge-dominated beam and high energy density physics (HEDP) research.