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First large scale application of novel Si stripixel detector in real large experiment: Si VTX in PHENIX upgrade at RHIC

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中国有色金属学会会刊：英文版 2006年第B01期16卷 141-145页

作者： LI Zheng H. ENYO Y. GOTO J. TOJO Y. AKIBA R. NOUICER A. L. DESHPANDE K. BOYLE V. CIANCIOLO riken bnl research center and bnl Instrumentation Division Upton NY 11973-5000 USA riken Wako Saitama 351-0198 Japan bnl Chemistry Department Upton NY 11973-5000 USA Stony Brook University Department of Physics and Astronomy Stony Brook NY 11794 USA Oak Ridge National Laboratory Oak Ridge TN 37831 USA

2D position sensitive, single-sided Si stripixel detector was selected as the one of the two main components of the Si vertex tracker (Si SVX) in the upgraded PHENIX detector at RHIC (relativistic heavy ion collider) in Brookhaven National Laboratory (bnl). This is the first large scale application of the novel Si stripixel detector in a real large experiment after many years of research and development at bnl. The first and second prototype fabrication runs of the SVX stripixel detectors were carried out successfully in bnl’s Si detector development and processing Lab. The processing of these stripixel detectors is similar to that for the standard single-sided strip detectors: one-sided processing, single implant for the pixel (strip) electrodes, etc. The only additional processing step is the double metal process, a technology that is simple and well matured by many Si detector processing industries and labs, including bnl. The laser and beam tests on those prototype detectors show the 2D position sensitivity and good position resolution in both X and U coordinates (about 25 μm for 80 μm pitch). For the mass production of 400 sensors needed for the Si SVX, the processing technology has been successfully transferred to the industrial: Hamamatsu Photonics (HPK). HPK has produced a pre-production run of stripixel sensors with the full PHENIX SVX specification on 150 mm diameter wafers. The laser tests on these pre-production wafers show good signal to noise ratio (about 20∶1).

关键词：相对论性重离子碰撞 PHENIX探测器天顶跟踪器硅顶点探测器硅条探测器应用

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Stabilization of a high-order harmonic generation seeded extreme ultraviolet free electron laser by time-synchronization control with electro-optic sampling

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High Power Laser Science and Engineering 2015年第2期3卷 1-10页

作者： H.Tomizawa T.Sato K.Ogawa K.Togawa T.Tanaka T.Hara M.Yabashi H.Tanaka T.Ishikawa T.Togashi S.Matsubara Y.Okayasu T.Watanabe E.J.Takahashi K.Midorikawa M.Aoyama K.Yamakawa S.Owada A.Iwasaki K.Yamanouchi riken SPring-8 Center Japan Synchrotron Radiation research Institute riken center for Advanced Photonics Japan Atomic Energy Agency The University of Tokyo

A fully coherent free electron laser(FEL) seeded with a higher-order harmonic(HH) pulse from high-order harmonic generation(HHG) is successfully operated for a sufficiently prolonged time in pilot user experiments by using a timing drift feedback. For HHG-seeded FELs, the seeding laser pulses have to be synchronized with electron bunches. Despite seeded FELs being non-chaotic light sources in principle, external laser-seeded FELs are often unstable in practice because of a timing jitter and a drift between the seeding laser pulses and the accelerated electron bunches. Accordingly,we constructed a relative arrival-timing monitor based on non-invasive electro-optic sampling(EOS). The EOS monitor made uninterrupted shot-to-shot monitoring possible even during the seeded FEL operation. The EOS system was then used for arrival-timing feedback with an adjustability of 100 fs for continual operation of the HHG-seeded FEL. Using the EOS-based beam drift controlling system, the HHG-seeded FEL was operated over half a day with an effective hit rate of 20%–30%. The output pulse energy was 20 μJ at the 61.2 nm wavelength. Towards seeded FELs in the water window region, we investigated our upgrade plan to seed high-power FELs with HH photon energy of 30–100 e V and lase at shorter wavelengths of up to 2 nm through high-gain harmonic generation(HGHG) at the energy-upgraded SPring-8Compact SASE Source(SCSS) accelerator. We studied a benefit as well as the feasibility of the next HHG-seeded FEL machine with single-stage HGHG with tunability of a lasing wavelength.

关键词： arrival-timing monitor electro-optic sampling(EOS)

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Novel quantum phenomena induced by strong magnetic fields in heavy-ion collisions

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Nuclear Science and Techniques 2017年第2期28卷 70-98页

作者： Koichi Hattori Xu-Guang Huang Physics Department and center for Particle Physics and Field Theory Fudan University Shanghai 200433 China riken-bnl research center Brookhaven National Laboratory Upton NY 11973-5000 USA Department of Physics Brookhaven National LaboratoryUpton NY 11973-5000 USA

The relativistic heavy-ion collisions create both hot quark–gluon matter and strong magnetic fields, and provide an arena to study the interplay between quantum chromodynamics and quantum electrodynamics. In recent years, it has been shown that such an interplay can generate a number of interesting quantum phenomena in hadronic and quark–gluon matter. In this short review, we first discuss some properties of the magnetic fields in heavy-ion collisions and then give an overview of the magnetic fieldinduced novel quantum effects. In particular, we focus on the magnetic effect on the heavy flavor mesons, the heavyquark transports, and the phenomena closely related to chiral anomaly.

关键词： Relativistic heavy-ion collisions Strong magnetic fields Anomalous transports Quarkonium Heavy quark diffusion dynamics

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EXPERIMENTS AT RHIC, THE FIRST SPIN COLLIDER

EXPERIMENTS AT RHIC, THE FIRST SPIN COLLIDER

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CCAST“自旋物理、Lattice QCD和RHIC物理”研讨会

作者： Hideto En'yo riken Japan riken bnl research center

RHIC spin program has begun. We have a series of program over 5 years to go.Y2001-2, The first polarized proton collision was successfully done with transversely polarized beam, produced unexpected spin phenomena which may relate to unknown behavior of QCD (transversity etc)Y2002-3, The first measurements of helicity asymmetry will SOON be performed @200GeV. Sizable AG generates surprises in the data. Y2003+, Statistics will be much improved @200GeV, ensuring the determination of △G . "Spin Crisis" will hopefully be solved by then. Y2005+, Weak Bosons will be produced at RHIC, the NEW "flavor sensitive" tool for the anti-quark/quark polarization and unpolarized structure function of anti-quark *** beyond...

关键词： EXPERIMENTS AT RHIC THE FIRST SPIN COLLIDER μ介子

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Recursive method for opacity expansion at finite temperature

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Chinese Physics C 2011年第1期35卷 44-49页

作者：刘嘉康忠波王恩科 Institute of Particle Physics Huazhong Normal University Key Laboratory of Quark & Lepton Physics(Huazhong Normal University) Ministry of EducationChina riken bnl research center Brookhaven National LaboratoryUptonNY 11973USA

Using a reaction operator approach, we derive the multiple-scattering induced gluon number distribution function to all orders in powers of opacity at finite temperature. The detailed balance effect is analyzed by taking into account both gluon emission and absorption in a thermal medium. We also calculate virtual corrections and show that the infrared divergence cancels out in the gtuon distribution function at finite temperature.

关键词： jet-quenching non-abelian energy loss opacity expansion detailed balance

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Metabolism and Long-distance Translocationof Cytokinins

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Journal of Integrative Plant Biology 2010年第1期52卷 53-60页

作者： Toru Kudo Takatoshi Kiba Hitoshi Sakakibara riken Plant Science center

During plant development, distantly-located organs must communicate in order to adapt morphological and physiological features in response to environmental inputs. Among the recognized signaling molecules, a class of phytohormones known as the cytokinins functions as both local and long-distance regulatory signals for the coordination of plant development. This cytokinin-dependent communication system consists of orchestrated regulation of the metabolism, translocation, and signal transduction of this phytohormone class. Here, to gain insight into this elaborate signaling system, we summarize current models of biosynthesis, transmembrane transport, and long-distance translocation of cytokinins in higher plants.

关键词： Metabolism and Long-distance Translocationof Cytokinins Figure IPT Long

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Consistency of Perfect Fluidity and Jet Quenching in Semi-Quark-Gluon Monopole Plasmas

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Chinese Physics Letters 2015年第9期32卷 25-30页

作者：徐杰谌廖劲峰 Miklos Gyulassy Department of Physics Columbia University New York 10027 USA Physics Department and CEEM Indiana University Bloomington 47408 USA riken bnl research center Bldg. 510A Brookhaven National Laboratory New York 11973 USA

We utilize a new framework, CUJET3.0, to deduce the energy and temperature dependence of the jet trans- port parameter, q （E 〉 10 GeV, T）, from a combined analysis of available data on nudear modification factor and azimuthal asymmetries from high energy nuclear collisions at RHIC/bnl and LHC/CERN. Extending a previous perturbative-QCD based jet energy loss model （known as CUJET2.0） with （2＋1）D viscous hydrody- namic bulk evolution, this new framework includes three novel features of nonperturbative physics origin; （i） the Polyakov loop suppression of color-electric scattering （aka ＇semi-QGP＇ of Pisarski et al.）, （ii） the enhancement of jet scattering due to emergent magnetic monopoles near Tc （aka ＇magnetic scenario＇ of Liao and Shuryak）, and Oii） thermodynamic properties constrained by lattice QCD data. CUJET3.0 reduces to v2.0 at high tem- peratures T 〉400 MeV, while greatly enhances ~ near the QCD deconfinement transition temperature range. This enhancement accounts well for the observed elliptic harmonics of jets with pT 〉10 GeV. Extrapolating our data-constrained q down to thermal energy scales, E-2 GeV, we find for the first time a remarkable consistency between high energy jet quenching and bulk perfect fluidity with η/s^T3/q^0.1 near To.

关键词： QGP QCD LHC

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Underwater persistent bubble-assisted femtosecond laser ablation for hierarchical micro/nanostructuring

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International Journal of Extreme Manufacturing 2020年第1期2卷 135-154页

作者： Dongshi Zhang Bikas Ranjan Takuo Tanaka Koji Sugioka riken center for Advanced Photonics 2-1 HirosawaWakoSaitama 351-0198Japan Innovative Photon Manipulation research Team RIKEN Center for Advanced PhotonicsWakoSaitama 351-0198Japan Metamaterials Laboratory RIKEN Cluster for Pioneering ResearchWakoSaitama 351-0198Japan

In this study,we demonstrate a technique termed underwater persistent bubble assisted femtosecond laser ablation in liquids(UPB-fs-LAL)that can greatly expand the boundaries of surface micro/nanostructuring through laser ablation because of its capability to create concentric circular macrostructures with millimeter-scale tails on silicon ***-tailed macrostructures are composed of layered fan-shaped(central angles of 45°–141°)hierarchical micro/nanostructures,which are produced by fan-shaped beams refracted at the mobile bubble interface(.50°light tilt,referred to as the vertical incident direction)during UPB-fs-LAL line-by-line *** flow generated during UPB-fs-LAL induces bubble *** scanning(e.g.1mms−1)allows a long bubble movement(as long as 2mm),while slow scanning(e.g.0.1mms−1)prevents bubble *** persistent bubbles grow considerably(*** of microns in diameter)due to incubation effects,they become sticky and can cause both gas-phase and liquidphase laser ablation in the central and peripheral regions of the persistent *** generates low/high/ultrahigh spatial frequency laser-induced periodic surface structures(LSFLs/HSFLs/UHSFLs)with periods of 550–900,100–200,40–100 nm,which produce complex hierarchical surface structures.A period of 40 nm,less than 1/25th of the laser wavelength(1030 nm),is the finest laser-induced periodic surface structures(LIPSS)ever created on *** NIR-MIR reflectance/transmittance of fan-shaped hierarchical structures obtained by UPB-fs-LAL at a small line interval(5μm versus 10μm)is extremely low,due to both their extremely high light trapping capacity and absorbance characteristics,which are results of the structures’additional layers and much finer *** the absence of persistent bubbles,only grooves covered with HSFLs with periods larger than 100 nm are produced,illustrating the unique attenuation abilities of laser properties(*** rate,energy,inciden

关键词： hierarchical micro/nanostructures persistent bubble femtosecond laser surface structuring beam refraction fan-shaped microstructure LIPSS

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DOMAIN WALL FERMIONS AND CHIRAL SYMMETRY

DOMAIN WALL FERMIONS AND CHIRAL SYMMETRY

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CCAST“自旋物理、Lattice QCD和RHIC物理”研讨会

作者： Taku Izubuchi Kanazawa University Japan riken bnl research center

Dynamical DWF quark simulation.. Two new algorithms ( a factor of three to four speed up). Lattice spacing a-1 - 1.7 GeV.. Sea quark masses mf(dyn)/ms - 0.5,0.75,1.0.. mres - a few MeV at Ls = 12.. improved gluon acti... 详细信息

关键词： DOMAIN WALL FERMIONS AND CHIRAL SYMMETRY

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USING SPIN TO EXPLORE NUCLEON STRUCTURE AND QCD

USING SPIN TO EXPLORE NUCLEON STRUCTURE AND QCD

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CCAST“自旋物理、Lattice QCD和RHIC物理”研讨会

作者： Werner Vogelsang riken bnl research center Brookhaven National Laboratory

Outline: Prologue Quark and Gluon Structure of the Nucleon Deeply-Inelastic Scattering Lessons from Polarized DIS A New Era of QCD Spin Physics

关键词： USING SPIN TO EXPLORE NUCLEON STRUCTURE AND QCD

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