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LULI2000 - Proton Accelerator and Collimation MAchiNe (M. Bardon)

The use of intense short-pulse lasers for ion beams acceleration has been studied over the past decade [1, 2]. The Target Normal Sheath Acceleration (TNSA) is a well-known master process for proton beams generation. The two principal concerns of the TNSA beams are their divergence and broadband energy spectrum (exponential distribution). For such applications as proton therapy, isochoric heating or fast ignition Inertial Confinement Fusion (ICF), these two features are not acceptable. The laser ion beam acceleration has thus a limited application domain compared to conventional accelerators such as LINAC or Synchrotron. In this experiment, we propose to study the performances of a new compact device for proton beams acceleration by laser proposed in [3]. This device can simultaneously: accelerate, focus and energy select the protons generated by the interaction of a short-pulse laser with a TNSA target. The main scientific advances of this proposed compared to the original experiment [3] are the following:

- demonstration of performances of this device at higher laser energy (80 J compared to 3 J),
- testing of new variants of this device,
- characterization of the current pulse propagation along the solenoid,
- comparison of the experimental results with the first full scale 3D numerical simulations (SOPHIE code developed at CEA),
- use complementary diagnostics for the ElectroMagnetic Pulse (EMP) characterization (B-dot probe for the radiated magnetic field and measurement of the discharge current).

This proposal is the first part of pluri-annual experimental campaigns on LULI2000 facility. The goal of this project is to applicate this new compact accelerator to a proton isochoric heating experiment. The first campaign will be dedicated to the characterization of the proton beam generated by this new compact device. The performances of this device will be compared to them of the alone TNSA target. A LULI2000 campaign is an important step in the development of this new scheme of compact proton accelerator driven by laser. The results obtained on this campaign will allow us to design new structures, optimized and more adapted to the high energy laser pulses. Assuming this campaign to be successful, these new systems will be tested on the LMJ-PETAL facility (France). The selective proton acceleration and collimation may open new applications for the laser-driven ion accelerators.

 

LULI2000 - S11-12/2019