A scintillating fiber imaging spectrometer for active characterization of laser-driven proton beams  

作　　者：J.K.Patel C.D.Armstrong R.Wilson M.Alderton E.J.Dolier T.P.Frazer A.Horne A.Lofrese M.Peat M.Woodward B.Zielbauer R.J.Clarke R.Deas P.P.Rajeev R.J.Gray P.Mc Kenna 

机构地区：[1]SUPA Department of Physics,University of Strathclyde,Glasgow,UK [2]Central Laser Facility,STFC Rutherford Appleton Laboratory,Harwell,Oxford,UK [3]PHELIX Group,GSI Helmholtzzentrum für Schwerionenforschung,Darmstadt,Germany [4]Defence Science and Technology Laboratory,Portsdown West,Fareham,Hampshire,UK [5]The Cockroft Institute,Sci-Tech Daresbury,Warrington,UK

出　　处：《High Power Laser Science and Engineering》2024年第6期16-27,共12页高功率激光科学与工程(英文版)

基　　金：financially supported by STFC,Dstl and EPSRC(grant numbers EP/R006202/1,EP/V049232/1 and EP/P020607/1);by Laserlab-Europe(grant agreement number 871124,European Union’s Horizon 2020 research and innovation program).

摘　　要：Next generation high-power laser facilities are expected to generate hundreds-of-MeV proton beams and operate at multiHz repetition rates, presenting opportunities for medical, industrial and scientific applications requiring bright pulses of energetic ions. Characterizing the spectro-spatial profile of these ions at high repetition rates in the harsh radiation environments created by laser–plasma interactions remains challenging but is paramount for further source development.To address this, we present a compact scintillating fiber imaging spectrometer based on the tomographic reconstruction of proton energy deposition in a layered fiber array. Modeling indicates that spatial resolution of approximately 1 mm and energy resolution of less than 10% at proton energies of more than 20 MeV are readily achievable with existing 100 μm diameter fibers. Measurements with a prototype beam-profile monitor using 500 μm fibers demonstrate active readouts with invulnerability to electromagnetic pulses, and less than 100 Gy sensitivity. The performance of the full instrument concept is explored with Monte Carlo simulations, accurately reconstructing a proton beam with a multiple-component spectro-spatial profile.

关 键 词：DIAGNOSTICS high repetition rate ion acceleration laser-solid interactions 

分 类 号：TN249[电子电信—物理电子学] O433[机械工程—光学工程]