(Color online) HOMDYN simulation of the horizontal emittance and beam envelope evolution along the SPARC photoinjector. is the distance from the cathode, measured along the accelerator axis.
(Color online) Multislit mask intercepting a space charge dominated beam.
(Color online) Three-dimensional (3D) mechanical drawing of the SPARC emittance meter. The drawing also shows one of the alignment tools (gray cylinder) which is to be installed, during alignment, on top of the end flanges. Leg extenders are also visible that can be removed if the device is to be installed on a supporting girder.
(Color online) Analysis of the residual space charge effect after the metallic mask.
(Color online) The complete slit mask assembled (right) and pictorial of the single components of the slit array.
(Color online) Optical microscopy pictures of a single slit obtained by mechanical machining (top) compared to the one produced by photochemical machining (bottom). The top picture also shows the sampling window used to compute the local average width.
(Color online) Beam phase space footprint and multislit measurement simulation at two different points. At the multislit device proves inadequate and a multishot single slit scan must be performed for proper transverse sampling of the beam.
(Color online) Electron beam imaging using Cr-oxide (top) and Ce-doped YAG radiators (bottom). The gain of the CCD camera had to be set approximately three times higher in the case of Cr-oxide screen to get pixel values comparable to those obtained with Ce:YAG. The rms horizontal size of the beam shown in the picture is .
On-line measurement of the optical system resolution can be done using the calibration marks on the screen holder.
(Color online) Emittance blowup as function of the beam misalignment in the bellows. The curves represent the percentage variation of beam rms emittance calculated at the end of the emittance meter (black squares) and at position where the emittance oscillation has a local maximum.
(Color online) Percentage variation vs of energy spread due to longitudinal wake fields with (red dots) and without (black squares) the contribution of bellows.
(Color online) Simulation of the beam transverse distribution at the screen in the spectrometer following the emittance meter.
(Color online) SPARC emittance meter during installation at the Photo Injector Test Facility PITZ.
(Color online) Picture of the beam at the Ce:YAG screen downstream the multislit mask.
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