Design of and data reduction from compact Thomson parabola spectrometers

Journal Article · Tue Mar 15 00:00:00 EDT 2011 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3556444· OSTI ID:22062275

Morrison, J T; Willis, C; Freeman, R R; Van Woerkom, L ^[1]

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1. Physics Department, Ohio State University, Columbus, Ohio 43210 (United States)

Thomson parabola spectrometers are used to characterize MeV ion beams produced in high intensity laser interactions. These spectrometers disperse multiple ion species according to their charge to mass ratio through the use of parallel electric and magnetic fields. Analytical solutions for ion deflection in electric and magnetic fields have been used to extract ion spectra with the assumption that fringing effects are negligible. Experimental space restrictions and dynamic range requirements necessitate designs that stress the analytical assumptions. Depending on design parameters, the error in the analytical assumption can be comparable to the energy resolution. Estimates are provided to approximate the error on the total ion deflection. A method for modeling ion trajectories including fringing effects is presented using software freely available or in common use. The magnetostatic fields are modeled in 3D, including material properties of nearby magnetic materials using RADIA. Electrostatic fields are modeled in 2D for a spectrometer implementing angled plates using the partial differential equation toolbox in MATLAB. Using these models to calculate the ion trajectory allows for analysis of a Thomson parabola spectrometer with an arbitrary field configuration.

• OSTI ID: 22062275
• Journal Information: Review of Scientific Instruments, Vol. 82, Issue 3; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ANALYTICAL SOLUTION
COMPUTER CODES
DESIGN
ENERGY RESOLUTION
ERRORS
ION BEAMS
ION SPECTROSCOPY
LASERS
MAGNETIC FIELDS
MAGNETIC MATERIALS
MEV RANGE
PARABOLAS
PARTIAL DIFFERENTIAL EQUATIONS
SPECTROMETERS
THOMSON SCATTERING
THREE-DIMENSIONAL CALCULATIONS
TRAJECTORIES