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Ion-bunch energy acoustic tracing by modulation of the depth-dose curve

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高功率激光科学与工程:英文版 2023年第3期11卷 86-93页

作者： A.Praßelsperger F.Balling H.-P.Wieser K.Parodi J.Schreiber fakultät für physik Ludwig-Maximilians-Universität MünchenGarchingGermany

Characterizing exact energy density distributions for laser-accelerated ion bunches in a medium is challenging due to very high beam intensities and the electro-magnetic pulse emitted in the laser-plasma interaction.Ion-bunch energy acoustic tracing allows for reconstructing the spatial energy density from the ionoacoustic wave generated upon impact in water.We have extended this approach to tracing ionoacoustic modulations of broad energy distributions by introducing thin foils in the water reservoir to shape the acoustic waves at distinct points along the depth-dose curve.Here,we present first simulation studies of this new detector and reconstruction approach,which provides an online read-out of the deposited energy with depth within the centimeter range behind the ion source of state-of-the-art laser-plasma-based accelerators.

关键词： ion-bunch energy acoustic tracing ion detector ionoacoustics laser-ion acceleration

A Brief Overview of Hard-thermal-Loop Perturbation theory

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Communications in theoretical Physics 2012年第3期57卷 409-421页

作者：苏楠 fakultt fr physik Universitt BielefeldD-33615 BielefeldGermany

the poor convergence of quantum field theory at finite temperature has been one of the main obstacles in the practical applications of thermal QCD for decades.Here we briefly review the progress of hard-thermal-loop perturbation theory (HtLpt) in reorganizing the perturbative expansion in order to improve the convergence.the quantum mechanical anharmonic oscillator is used as a simple example to show the breakdown of weak-coupling expansion,and variational perturbation theory is introduced as an effective resummation scheme for divergent weak-coupling expansions.We discuss HtLpt thermodynamic calculations for QED,pure-glue QCD,and QCD with N f=3 up to three-loop order.the results suggest that HtLpt provides a systematic framework that can be used to calculate both static and dynamic quantities for temperatures relevant at LHC.

关键词：摄动理论热环大型强子对撞机热力学计算 QCD 量子场论有限温度微扰展开

Hunting η-bound nuclei

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Chinese Physics C 2010年第9期34卷 1218-1223页

作者： H.Machner Institut für Kernphysik Forschungszentrum Jülich fakultt für physik Universitt Duisburg-Essen

the η meson can be bound to atomic nuclei.Experimental search is discussed in the form of final state interaction for the reactions dp → 3 Heη and dd → 4 Heη.For the latter case tensor polarized deuterons were used in order to extract the s-wave strength.For both reactions complex scattering lengths are deduced： a 3 Heη = ± 10.7±0.8 ＋0.1 -0.5 ＋i· 1.5±2.6 ＋1.0-0.9 fm and a 4 Heη = [±（3.1±0.5）＋i·（0±0.5）] fm.In a two-nucleon transfer reaction under quasi-free conditions,p^ 27 Al → ^3 HeX,was investigated.the system X can be the bound 25 Mg  η at rest.When a possible decay of an intermediate N  （1535） is required,a highly significant bump shows up in the missing mass spectrum.the data give for a bound state a binding energy of 13.3±1.6 MeV and a width of σ=4.4±1.3 MeV.

关键词： η meson production η nucleus interaction final state interaction recoil free kinematics

three-dimensional acoustic monitoring of laser-accelerated protons in the focus of a pulsed-power solenoid lens

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高功率激光科学与工程:英文版 2023年第3期11卷 57-63页

作者： S.Gerlach F.Balling A.K.Schmidt F.E.Brack F.Kroll J.Metzkes-Ng M.Reimold U.Schramm M.Speicher K.Zeil K.Parodi J.Schreiber fakultät für physik Ludwig-Maximilians-Universität MünchenGarchingGermany Helmholtz-Zentrum Dresden-Rossendorf DresdenGermany technische Universität Dresden DresdenGermany

the acoustic pulse emitted from the Bragg peak of a laser-accelerated proton bunch focused into water has recently enabled the reconstruction of the bunch energy distribution.By adding three ultrasonic transducers and implementing a fast data analysis of the filtered raw signals,I-BEAt(Ion-Bunch Energy Acoustic tracing)3D now provides the mean bunch energy and absolute lateral bunch position in real-time and for individual bunches.Relative changes in energy spread and lateral bunch size can also be monitored.Our experiments at DRACO with proton bunch energies between 10 and 30 MeV reveal sub-MeV and sub-mm resolution.In addition to this 3D bunch information,the signal strength correlates also with the absolute bunch particle number.

关键词： ion diagnostics ionoacoustics laser-driven plasma source laser-ion acceleration

预言X(3872)的伴随态D_(s)(*)D_(s)(*)束缚态

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Science Bulletin 2021年第13期66卷 1288-1295,M0003,M0004页

作者：孟璐王波朱世琳 Ruhr-Universität Bochum Fakultät für Physik und AstronomieInstitut für Theoretische Physik IID-44780 BochumGermany Center of High Energy Physics Peking UniversityBeijing 100871China School of Physics and State Key Laboratory of Nuclear Physics and technology Peking UniversityBeijing 100871China

本文研究了双介子系统中的SU(3)味道对称性,重夸克自旋对称性及它们的破缺效应,进而基于SU(3)味道对称性和重夸克自旋对称下的两个前提证明了[D_(s)(*)D_(s)(*)]^(0++),[D_(s)(*)D_(s)/D_(s)D_(s)(*)]^(1+-)和[D_(s)(*)D_(s)(*)]^(+-)束缚态的存在.第一个前提,X(3872)是D*D/DD*的弱束缚态,可以被它的质量和衰变分支比所支持.第二个前提,存在[DsDs]^(0++)的束缚态,被格点QCD的计算以及LHCb合作组观测到的χ_(c0)(3930)所支持.这些束缚态的预言有望在未来B→D_(s)(*)D_(s)(*)h的实验分析中找到(h代表轻强子).[D_(s)(*)D_(s)(*)]^(0++)束缚态也有望在B→J/ψϕK的衰变J/ψϕ的末态中重建得到.

关键词：束缚态衰变分支比格点QCD SU(3) 重夸克强子末态破缺

预言X(3872)的伴随态■s* Ds*束缚态(英文)

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Science Bulletin 2021年第13期66卷 1288-1295页

作者：孟璐王波朱世琳 Ruhr-Universit?t Bochum Fakult?t für Physik und Astronomie Institut für Theoretische Physik Ⅱ Center of High Energy Physics Peking University School of Physics and State Key Laboratory of Nuclear Physics and technology Peking University

本文研究了双介子系统中的SU(3)味道对称性,重夸克自旋对称性及它们的破缺效应,进而基于SU(3)味道对称性和重夸克自旋对称下的两个前提证明了■束缚态的存在.第一个前提,X(3872)是■的弱束缚态,可以被它的质量和衰变分支比所支持.第二... 详细信息

本文研究了双介子系统中的SU(3)味道对称性,重夸克自旋对称性及它们的破缺效应,进而基于SU(3)味道对称性和重夸克自旋对称下的两个前提证明了■束缚态的存在.第一个前提,X(3872)是■的弱束缚态,可以被它的质量和衰变分支比所支持.第二个前提,存在■的束缚态,被格点QCD的计算以及LHCb合作组观测到的χC0(3930)所支持.这些束缚态的预言有望在未来■的实验分析中找到(h代表轻强子).■束缚态也有望在B→J/ψΦK的衰变J/ψΦ的末态中重建得到.

关键词： SU(3) flavor symmetry Hadronic molecule X(3872) tetraquark

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低能核天体物理实验平台(英文)

IMP & HIRFL Annual Report 2012年 52-53页

作者：陈思泽 He Jianjun Xu Shiwei Zhang Liyong Hu Jun Hou Suqing Yu Xiangqing Ma Shaobo Claus Rolfs fakultt für physik und Astronomie Ruhr-Universitt Bochum

Low energy platform is very important for nuclear astrophysics experiment study[1].the Institute of Modern Physics(IMP)recently established a low energy experiment terminal for nuclear astrophysics study in Lanzhou,Gansu,China.the low-energy experiment terminal in IMP is established on the 320kV HV Platform which is a multi-discipline research platform and has been used for surface and/or ion-atom/molecule studies since

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用各向异性流v_2和v_4测试超相对论性重离子碰撞的动力学描述(英文)

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高能物理与核物理 2007年第12期31卷 1153-1156页

作者： N.Borghini fakultt für physik Universitt Bielefeld Postfach 100131D-33501 BielefeldGermany

We present various predictions for the anisotropic collective flow of particles in heavy-ion collisions, in particular scaling laws of the second and fourth harmonics v_2 and v_4,derived within ideal fluid dynamics. W... 详细信息

关键词：各向异性流重离子碰撞流体动力学和声学

Nonadiabatic dynamics and geometric phase of an ultrafast rotating electron spin

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Science Bulletin 2019年第6期64卷 380-384页

作者： Xing-Yan Chen tongcang Li Zhang-Qi Yin Center for Quantum Information Institute for Interdisciplinary Information Sciences Tsinghua University Max-Planck-Institut für Quantenoptik fakult?t für physik Ludwig-Maximilians-Universit?t München Department of Physics and Astronomy Purdue University School of Electrical and Computer Engineering Purdue University Purdue Quantum Center Purdue University Birck Nanotechnology Center Purdue University

the spin in a rotating frame has attracted a lot of attentions recently,as it deeply relates to both fundamental physics such as pseudo-magnetic field and geometric phase,and applications such as gyroscopic sensors.However,previous studies only focused on adiabatic limit,where the rotating frequency is much smaller than the spin frequency.Here we propose to use a levitated nano-diamond with a built-in nitrogen-vacancy(NV)center to study the dynamics and the geometric phase of a rotating electron spin without adiabatic approximation.We find that the transition between the spin levels appears when the rotating frequency is comparable to the spin frequency at zero magnetic field.then we use Floquet theory to numerically solve the spin energy spectrum,study the spin dynamics and calculate the geometric phase under a finite magnetic field,where the rotating frequency to induce resonant transition could be greatly reduced.

关键词： Nitrogen-vacancy center Nonadiabatic geometric phase Ultrafast rotor Rabi oscillation Optomechanics