Highlights: Below are a few publication highlights directly or indirectly related to the GPT project. Alternatively, see all publications and our most cited papers.

Compression of subrelativistic space-charge-dominated electron bunches for single-shot femtosecond electron diffractionon
Physical Review Letters, 105 (26), art. no. 264801 (2010).
DOI: 10.1103/PhysRevLett.105.264801

Van Oudheusden, T., Pasmans, P.L.E.M., Van Der Geer, S.B., De Loos, M.J., Van Der Wiel, M.J., Luiten, O.J.

We demonstrate the compression of 95 keV, space-charge-dominated electron bunches to sub-100 fs durations. These bunches have sufficient charge (200 fC) and are of sufficient quality to capture a diffraction pattern with a single shot, which we demonstrate by a diffraction experiment on a polycrystalline gold foil. Compression is realized by means of velocity bunching by inverting the positive spacecharge- induced velocity chirp. This inversion is induced by the oscillatory longitudinal electric field of a 3 GHz radio-frequency cavity. The arrival time jitter is measured to be 80 fs.

Simulated / Measured

Phase-space manipulation of ultracold ion bunches with time-dependent fields
Physical Review Letters, 105 (3), art. no. 034802 (2010).
DOI: 10.1103/PhysRevLett.105.034802

Reijnders, M.P., Debernardi, N., Van Der Geer, S.B., Mutsaers, P.H.A., Vredenbregt, E.J.D., Luiten, O.J.

All applications of high brightness ion beams depend on the possibility to precisely manipulate the trajectories of the ions or, more generally, to control their phase-space distribution. We show that the combination of a laser-cooled ion source and time-dependent acceleration fields gives new possibilities to perform precise phase-space control. We demonstrate reduction of the longitudinal energy spread and realization of a lens with control over its focal length and sign, as well as the sign of the spherical aberrations. This creates new possibilities to correct for the spherical and chromatic aberrations which are presently limiting the spatial resolution.

Reference to GPT: Please quote http://www.pulsar.nl/gpt in papers containing GPT simulation results. If the simulations are obtained with the 3D mesh-based space-charge routine, the following references are appropriate:
S.B. van der Geer, O.J. Luiten, M.J. de Loos, G. Pöplau, U. van Rienen, 3D space-charge model for GPT simulations of high brightness electron bunches, Institute of Physics Conference Series, No. 175, (2005), p. 101.
Gisela Pöplau, Ursula van Rienen, Bas van der Geer, and Marieke de Loos, Multigrid algorithms for the fast calculation of space-charge effects in accelerator design, IEEE Transactions on magnetics, Vol 40, No. 2, (2004), p. 714.