Author: Tang, Z.
Paper Title Page
Development of Achromatic Imaging Capabilities for pRad at LANSCE  
  • M. Schanz, J.C. Allison, M.S. Freeman, F.G. Mariam, C.L. Morris, L.P. Neukirch, Z. Tang
    LANL, Los Alamos, New Mexico, USA
  • E.V. Valetov
    MSU, East Lansing, Michigan, USA
  Funding: The research presented is supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under project number 20220343ER.
Proton radiography is a powerful diagnostics technique that is capable of resolving ultra-fast processes on the ns scale in dense matter with micrometer spatial resolution. This unique performance is realized by the use of a chromatic imaging system, which consists of four quadrupole lenses [1]. Chromatic imaging systems have a mono-energetic focal length. That means, if a target with areas of different energy losses is to be investigated, it is only possible to focus on one proton energy leaving other areas of interest blurred. A simple method of focusing multiple energies at once and thus increasing the depth-of-field is the use of multiple detector stations along the beam axis. Proton images captured at downstream detector positions can be combined into a single image using a method called ’focus stacking’. A complete cancellation of the position- and energy dependent 2nd order chromatic aberrations that mostly affect the current image quality of pRad [2] is only possible by using an achromatic imaging system. Following the proposals in early design studies at LANSCE [3] a new prototype achromatic system is currently being developed for a 25 MeV S-band electron accelerator.
[1] N. King, et al., Nucl. Instr. and Meth. in Phys. Res. A, Vol 424, 1999
[2] F.E. Merrill, Rev. of Acc. Sci. and Tech. Vol 8, 2015
[3] B. Blind, A.J. Jason, Proc. of PAC, 2005
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