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The facility

Laser parameters:

It is proposed to use a commercial, standardized and easy-to-maintain laser-system in the FZJ close to the COSY accelerator hall. The proposed Ti:Sapphire laser system has a modular architecture allowing amplification stages to be added consecutively. There are three stages planned. The first stage would have a peak power of 10 TW (repetition rate: 100 Hz or higher), the second of 100 TW (repetition rate: 10 Hz) and, finally, the third stage would have a peak power of 1.5 PW (repetition rate: 1 Hz).

X-ray beam-lines:

To cover the full range of scientific requirements the pulse X-ray facility will need three independent beam lines employing different conversion concepts to deliver complementary photon energy ranges.

JuSPARC Fig 4Fig. 4: Floor plan of JuSPARC next to the COSY accelerator complex

The first is a femtosecond pulsed, narrow band, coherent soft X-ray line. It is based on the high harmonic generation (HHG) and initially covers the soft X-ray photon energy range (50 – 200 eV), currently available by HHG from gas targets.

The second is a femtosecond pulsed, hard X-ray beam line, based on the betatron oscillations of free plasma electrons. The photon energy covers the range from 2 – 100 keV.

The third is an undulator-based femtosecond pulsed soft X-ray line with tunable photon energy and polarization (e.g. APPLE-II design). This line makes use of the laser wake-field effect to create a beam of relativistic electrons, which are then passed through an undulator for the excitation of soft X-rays. The undulator provides the tunability over the soft X-ray range and an APPLE-II type undulator offers the possibility of creating elliptically and circularly polarized light. 

On-demand-simulations:

An important part of the planning and analysis of any source optimization experiment are computer simulations. The Plasma Simulation Laboratory at the Jülich Supercomputing Centre, IAS, has well-established expertise in the modeling and simulation of such high-intensity laser-produced photon and particle beams. The SimLab currently develops and maintains several parallel codes (JUSPIC, EPOCH, PEPC) which are used routinely to perform multi-dimensional, kinetic simulations of laser-ion and electron acceleration on current supercomputers at IAS. A key innovation proposed for the JuSPARC experimental facility is an integrated simulation cockpit, in which source optimization is enhanced via real-time feedback from simulations running on the local supercomputers. This concept goes way beyond traditional theoretical support, which usually takes place after the experiment has finished, precluding any benefits of immediate corrective feedback.


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