A High-Power Current Pulse-Generator Using An Insulated-Gate Bipolar-Transistor

A simple and reliable high power current pulse generator using a commercially available insulated gate bipolar transistor has been designed and constructed. This device generates current pulses up to 650 A at up to 990 V with the pulse length adjustable over 0.6 μs—1 ms with a rise time \u3c0.5 μs

Pion and kaon structure at the electron-ion collider

Understanding the origin and dynamics of hadron structure and in turn that of atomic nuclei is a central goal of nuclear physics. This challenge entails the questions of how does the roughly 1GeV mass-scale that characterizes atomic nuclei appear; why does it have the observed value; and, enigmatically, why are the composite Nambu-Goldstone (NG) bosons in quantum chromodynamics (QCD) abnormally light in comparison? In this perspective, we provide an analysis of the mass budget of the pion and proton in QCD; discuss the special role of the kaon, which lies near the boundary between dominance of strong and Higgs mass-generation mechanisms; and explain the need for a coherent effort in QCD phenomenology and continuum calculations, in exa-scale computing as provided by lattice QCD, and in experiments to make progress in understanding the origins of hadron masses and the distribution of that mass within them. We compare the unique capabilities foreseen at the electron-ion collider (EIC) with those at the hadron-electron ring accelerator (HERA), the only previous electron-proton collider; and describe five key experimental measurements, enabled by the EIC and aimed at delivering fundamental insights that will generate concrete answers to the questions of how mass and structure arise in the pion and kaon, the Standard Model's NG modes, whose surprisingly low mass is critical to the evolution of our Universe

Measurement Of Differential Cross Sections Of p(e,e'{pi}{sup +})n For High-Lying Resonances At Q{sup 2} < 5 GeV{sup 2}

The exclusive electro-production process $ep\to e^{\prime}n\pi^+$ was measured in the range of the invariant mass for $n\pi^+$ system $1.6~\rm{GeV}\le W \le 2.0~\rm{GeV}$, and the photon virtuality $1.8~\rm{GeV^2}\le Q^2\le4.0~\rm{GeV^2}$ using CLAS. For the first time, these kinematics are probed in exclusive $\pi^+$ production from the protons with nearly full coverage in the azimuthal and polar angles of the $n\pi^+$ center-of-mass system. In this experiment, approximately 39,000 differential cross-section data points were measured. In this proceeding, preliminary results of our latest analysis work are presented on differential cross sections and structure functions as well as Legendre Moments