A new method on diagnostics of muons produced by a short pulse laser

Abstract

Muons produced by a short pulse laser can serve as a new type of muon source having potential advantages of high intensity, small source emittance, short pulse duration and low cost. To validate it in experiments, a suitable muon diagnostics system is needed since high muon flux generated by a short pulse laser shot is always accompanied by high radiation background, which is quite different from cases in general muon researches. A detection system is proposed to distinguish muon signals from radiation background by measuring the muon lifetime. It is based on the scintillator detector with water and lead shields, in which water is used to adjust energies of muons stopped in the scintillator and lead to against radiation background. A Geant4 simulation on the performance of the detection system shows that efficiency up to 52% could be arrived for low-energy muons around 200 MeV and this efficiency decreases to 14% for high-energy muons above 1000 MeV. The simulation also shows that the muon lifetime can be derived properly by measuring attenuation of the scintilla light of electrons from muon decays inside the scintillator detector.

Experimental progress of inertial confinement fusion based at the ShenGuang-III laser facility in China

“…The implosion symmetry can be inferred from the size and shape of hotspot and cold fuel. Fusion products bring abundant information about the hotspot and fusion process [30][31][32][33][34][35][36][37][38]. X-ray and neutron imaging are used to diagnose the size and shape of the hotspot.…”

“…Since the fuel area density of implosions at the SG-III laser facility is very low (~several mg cm −2 ), the ratio of secondary to primary neutron yield has been used to measure the area density. Additionally, two wedged range filters (WRFs), one charged particle spectrometer (CPS) and one magnetic recoil spectrometer (MRS) have been constructed for diagnosing high-convergence implosions [38].…”

“…Fuel ρR can be diagnosed by measuring the energy loss of protons and by measuring the yield ratio of the secondary protons to the primary neutrons. Several proton spectrometers have been built up at the SG-III laser facility, including an Al filtered CR-39 spectrometer, a step ranged filter (SRF) proton spectrometer and a Si-wedged range filter (WRF) proton spectro meter [38]. They were applied to measure the total and fuel ρR in the cryogenic capsule implosions, as shown in figure 18.…”

All-optical acceleration in the laser wakefield

“…Box 919-986, Mianyang 621900, China. Email: yqgu@caep.cn laser facility [14] and diagnosed efficiently [21] . But those muons with lower mean energies and broad energy spread ranging from hundreds of MeV to GeV [14] limit the applications.…”

“…[14] , where the high-energy photons come from the LWFA electrons with energy up to several GeV [15–20] interacting with high materials. dimuons could be produced by a 100 J petawatt laser facility [14] and diagnosed efficiently [21] . But those muons with lower mean energies and broad energy spread ranging from hundreds of MeV to GeV [14] limit the applications.…”