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Optimizing beam transport in rapidly compressing beams on the neutralized drift compression experiment-II

Matter and Radiation at Extremes 2018年第2期3卷 78-84页

作者： Anton D.Stepanov John J.Barnard Alex Friedman erik p.gilson David p.Grote Qing Ji Igor D.Kaganovich Arun persaud peter A.Seidl Thomas Schenkel University of Washington SeattleWAUSA Lawrence Livermore National Laboratory LivermoreCAUSA princeton plasma physics Laboratory PrincetonNJUSA Lawrence Berkeley National Laboratory BerkeleyCAUSA

The Neutralized Drift Compression Experiment-II(NDCX-II)is an induction linac that generates intense pulses of 1.2 MeV helium ions for heating matter to extreme ***,we present recent results on optimizing beam *** NDCX-II beamline includes a 1-m-long drift section downstream of the last transport solenoid,which is filled with charge-neutralizing plasma that enables rapid longitudinal compression of an intense ion beam against space-charge *** transport section on NDCX-II consists of 28 *** optimal field settings for a group of solenoids requires knowledge of the envelope parameters of the *** the beam on the scintillator gives the radius of the beam,but the envelope angle is not measured *** demonstrate how the parameters of the beam envelope(radius,envelop angle,and emittance)can be reconstructed from a series of images taken by varying the B-field strengths of a solenoid upstream of the *** use this technique to evaluate emittance at several points in the NDCX-II beamline and for optimizing the trajectory of the beam at the entry of the plasma-filled drift section.

关键词： Charged-particle beams Induction accelerators Beam dynamics Beam emittance Ion beam diagnostics

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Coated boron layers by boronization and a real-time boron coating using an impurity powder dropper in the LHD

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plasma Science and Technology 2024年第8期26卷 25-31页

作者： Naoko ASHIKAWA Robert LUNSFORD Federico NESpOLI erik gilson Yaowei YU Jiansheng HU Shinichiro KADO National Institute for Fusion Science Toki 509-5292Japan princeton plasma physics Laboratory Princeton NJ 08540United States of America Institute of plasma physics Chinese Academy of SciencesHefei 230031People’s Republic of China Institute of Advanced Energy Kyoto UniversityKyoto 611-0011Japan

In the Large Helical Device(LHD),diborane(B2H6)is used as a standard boron source for boronization,which is assisted by helium glow *** 2019,a new Impurity powder Dropper(IpD)system was installed and is under evaluation as a real-time wall conditioning *** the LHD,which is a large-sized heliotron device,an additional helium(He)glow discharge cleaning(GDC)after boronization was operated for a reduction in hydrogen recycling from the coated boron *** operational time of 3 h was determined by spectroscopic data during glow discharges.A flat hydrogen profile is obtained on the top surface of the coated boron on the specimen exposed to *** results suggest a reduction in hydrogen at the top surface by *** oxygen in coated boron was obtained by boronization,and the coated boron,which has boron-oxide,on the first wall by B-IpD was also *** the difference in coating areas between B2H6 boronization and B-IpD operation,it would be most effective to use the IpD and B2H6 boronization coating together for optimized wall conditioning.

关键词： boron layer oxygen impurity hydrogen recycling impurity powder dropper LHD EAST

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