Nov. 19, 2007
Publication Citing LORENTZ
The External Technical Papers (Particle Trajectory Analysis section) has just had two new
papers referencing LORENTZ added.
Phase-contrast x-ray imaging with a liquid-metal-jet-anode microfocus source
Appl. Phys. Lett. 91, 074104 (2007)
T. Tuohimaa, M. Otendal, and H. M. Hertz
Phase-contrast methods increase contrast, detail, and selectivity in x-ray imaging. Present compact x-ray
sources do not provide the necessary spatial coherence with sufficient power to allow the laboratory-scale high-resolution
phase-contrast imaging with adequate exposure times. In this letter, the authors demonstrate phase-contrast imaging with
few-micron detail employing a compact ~6.5 µm spot liquid-metal-jet-anode high-brightness microfocus source. The 40 W source
is operated at more than ten times higher electron-beam power density than present microfocus sources and is shown to provide
sufficient spatial coherence as well as scalability to high power, thereby enabling the application of phase-contrast x-ray
imaging with short exposure times in clinics and laboratories.
High-intensity electron beam for liquid-metal-jet anode hard x-ray generation
Proceedings of SPIE
Laser-Generated, Synchrotron, and Other Laboratory X-Ray and EUV Sources, Optics, and Applications II
Volume 5918 (Sep. 10, 2005)
Tomi Tuohimaa, Mikael Otendal, and Hans M. Hertz
We report on our progress towards the experimental realization of a liquid-metal-jet-anode
x-ray source with high brightness. We have previously shown that this electron-impact source has potential for very
high x-ray brightness by combining small-spot high-flux operation of the electron beam with high-speed operation of
the regenerative liquid-metal-jet anode. In the present paper we review the system and describe theoretical calculations
for improving the 50 kV, 600 W electron-beam focussing to ~30 µm spot size. With such a system the power density on the
liquid-metal-jet would be ~400 kW/mm2, i.e., more than an order of magnitude higher than the power density on a
state-of-the-art rotating anode.
Nov. 12, 2007
Publication Citing LORENTZ
The External Technical Papers (Particle Trajectory Analysis section) list now contains a
link to the AIP page to access a paper on the design of a high current H- LEBT.
Modeling of a High Current H- LEBT with the Lorentz-EM 3D Ion Optics Code
AIP Conf. Proc. -- August 10, 2007 -- Volume 925, pp. 318-323
PRODUCTION AND NEUTRALIZATION OF NEGATIVE IONS AND BEAMS: 11th International Symposium on the Production and Neutralization of Negative Ions and Beams
Issue Date: August 10, 2007
S. K. Hahto, D. G. Bilbrough, R. Keller
High current electrostatic Low-Energy Beam Transport (LEBT) systems are currently being
developed for several applications ranging from H- cyclotrons to high intensity linear accelerators. A new design
building on the experiences gained from the Spallation Neutron Source (SNS) LEBT system was modeled recently in
2D with PBGUNS. In this paper a 3D treatment is given for this new LEBT design for a 60 mA, 65 kV H- beam. For
this type of LEBT 3D modeling is essential to accurately model the deflection of the co-extracted electrons from
the beam. The beam chopping and steering for RFQ injection also presents a 3D problem for the otherwise
cylindrically symmetric geometry. The modeled LEBT can transport a 60 mA H- beam with 0.2 mm mrad 1-rms emittance
and Twiss parameters that are in accordance with established SNS LEBT specifications.