Calibration of the low-energy channel Thomson parabola of the LMJ-PETAL diagnostic SEPAGE with protons and carbon ions

Abstract

The SEPAGE diagnostic will detect charged particles (electrons, protons, and ions) accelerated in the interaction of the PETAL (PETawatt Aquitaine Laser) laser with its targets on the LMJ (Laser MegaJoule)-PETAL laser facility. SEPAGE will be equipped with a proton-radiography front detector and two Thomson parabolas (TP), corresponding to different ranges of the particle energy spectra: Above 0.1 MeV for electrons and protons in the low-energy channel, with a separation capability between protons and C up to 20 MeV proton energy and above 8 MeV for the high-energy channel, with a separation capability between protons and C up to 200 MeV proton kinetic energy. This paper presents the calibration of the SEPAGE's low-energy channel TP at the Tandem facility of Orsay (France) with proton beams between 3 and 22 MeV and carbon-ion beams from 5.8 to 84 MeV. The magnetic and electric fields' integrals were determined with an accuracy of 10 by combining the deflections measured at different energies with different target thicknesses and materials, providing different in-target energy losses of the beam particles and hence different detected energies for given beam energies.

Turbulent hydrodynamics experiments in high energy density plasmas: scientific case and preliminary results of the TurboHEDP project

“…A turbulent magnetic field created for the first time in HED plasmas from hydrodynamics instabilities (and not colliding flows [84] ) could potentially be probed with the PETAL generated proton beam by radiographing the turbulent zone. The proton spectrum and angular distribution could be with the SEPAGE diagnostic [85] on a reference shot. Hence the proton beam will propagate across the turbulent mixing zone on a second shot, and the proton spectrum is compared to the reference, providing reproducibility in laser condition.…”

Univocal Discrimination of α Particles Produced by 11B(p, α)2α Fusions in Laser-Matter Experiments by Advanced Thomson Spectrometry

“…A B and A E are the integral coefcients of the magnetic and electric feld along the longitudinal direction z that includes the nonuniform feld. Tey include both the feld integral I B and I E [38] as well as all the dependences from the distances as follows:…”

Thomson parabola and time-of-flight detector cross-calibration methodology on the ALLS 100 TW laser-driven ion acceleration beamline

“…( 5) and (6). As shown in the work of Ducret et al, 43 characterizing the field integrals allows us to bring a more general representation of the electric E and magnetic B fields used for TP spectrometers, avoiding the need to assume top-hat field distributions along the longitudinal axis. The values of IB and IE can further be inserted in the well-known non-relativistic, non-paraxial dispersion equations for the solution of charged-particle kinematics traversing static electric and magnetic fields for the case of Thomson parabolas, as shown by Eqs.…”