Rasmus Ischebeck, Franz-Josef Decker, Mark Hogan, Richard Iverson, Patrick
Krejcik, Robert Siemann, Dieter Walz (SLAC, Menlo Park, California), Melissa
Lincoln (Stanford University, Stanford, Califormia), Chris Clayton, Chengkun
Huang, Wei Lu (UCLA, Los Angeles, California), Suzhi Deng, Erdem Oz (USC, Los
Angeles, California)
In the plasma wakefield acceleration experiment E-167, optical transition radiation
is used to measure the transverse profile of the electron bunches before and
after the plasma acceleration.
The distribution of the electric field from a single electron does not give
a point-like distribution on the detector, but has a certain extension. Additionally,
the resolution of the imaging system is affected by aberrations. The transverse
profile of the bunch is thus convolved with a point spread function (PSF).
Algorithms that deconvolve the image can help to improve the resolution.
Imaged test patterns are used to determine the modulation transfer function
of the lens. From this, the PSF can be reconstructed.
The Lucy-Richardson algorithm is used to deconvolute this PSF from test images.