Bulletin of the American Physical Society
2005 2nd Joint Meeting of the Nuclear Physics Divisions of the APS and The Physical Society of Japan
Sunday–Thursday, September 18–22, 2005; Maui, Hawaii
Session CJ: Instrumentation I |
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Sponsoring Units: DNP JPS Chair: Yasuyuki Akiba, RIKEN Room: Ritz-Carlton Hotel Hawaii |
Tuesday, September 20, 2005 2:00PM - 2:15PM |
CJ.00001: Particle identification in the Time Projection Chamber at SPring8/LEPS Takahiro Sawada, Hisako Fujimura, Yuji Kato, Takashi Nakano, Masayuki Niiyama We study $\Lambda$(1405) photoproduction from C, CH2, and Cu nuclei with Time Projection Chamber (TPC) detector at the SPring-8/LEPS beamline. The photon beam with 1.5-2.9 GeV is produced by backward Compton scattering laser photon from 8 GeV stored electrons. Particle identification (PID) is allowed by dE/dx and momentum measurements with TPC. A good PID capability, that is good $\pi$/p/K separation, is crucially important in order to exclude background contribution caused by miss particle identification. In this talk, the current status of the PID will be presented. [Preview Abstract] |
Tuesday, September 20, 2005 2:15PM - 2:30PM |
CJ.00002: The Digital Data Acquisition System for SeGA at the NSCL C. Vaman, T. Glasmacher, K. Starosta, P. Mantica At the National Superconducting Cyclotron Laboratory (NSCL) the work for implementation of a $\sim$664 channel Digital Data Acquisition System (DDAS) for the Segmented Germanium Array (SeGA) detectors, was started. The most significant gain in performance for SeGA can be achieved with implementation of gamma-ray tracking and resulting identification of the position of the first gamma-ray interaction. The identification of the first gamma-ray interaction position for in-beam experiments results in reduced Doppler broadening of gamma-ray peaks and improved experimental sensitivity. For these improvements to be possible, digitization of the data from the Ge detectors has to be digitized right after preamplification and processed in real time. The talk will present some of the technical solutions and the current status of the project. [Preview Abstract] |
Tuesday, September 20, 2005 2:30PM - 2:45PM |
CJ.00003: The Silicon Tracker Upgrade for the Phenix Muon Arms Gerd Kunde A proposed upgrade to the Phenix muon arms is a four station precision silicon vertex tracker which would be placed before the muon arm absorbers. This silicon detector will greatly expand the physics reach of the muon arms. The capability to detect displaced single muon tracks and displaced vertices of muon decay will greatly impact the open charm and open beauty detection and allow to directly measure the beauty quark production via the J/psi decay branch. The four station tracker will use a mini-strip silicon detector geometry in umbrella shape to cover the muon arm acceptance. Measurements pertaining to the quark gluon plasma, shadowing in d-A and delta-G in p-p will be discussed and the readout concept will be presented. [Preview Abstract] |
Tuesday, September 20, 2005 2:45PM - 3:00PM |
CJ.00004: Time of Flight System for the PHENIX high-pt Detector Upgrade Hugo Valle The PHENIX experiment has observed enhanced proton/pion ratios in central Au+Au collisions as compared to the expectation from parton fragmentation. The measurements have been done using the scintillator based Time-of-Flight (TOF) detector in the PHENIX East arm, which allowed $\pi$/K and K/p separation up to pt = 2.5 and 4 GeV/c respectively. Particle identification (PID) to higher pt ($>$ 8 GeV/c) is needed to better characterize the hadron production mechanism at intermediate and high-pt and differentiate between competing theoretical descriptions. The PHENIX detector is being upgraded with a high-pt PID system. A cost-effective TOF system based on Multi-gap Resistive Plate chambers (MRPC) is being implemented as part of this upgrade. The MRPC-TOF will provide high-resolution timing measurement in the PHENIX West arm. It will supplement the PID provided by the Aerogel and Ring Imaging Cerenkov Counters, and the goal is to provide seamless particle identification in the range 0.2 $<$ pT $<$ 9 GeV/c. Three different prototypes were installed and operated during RUN5 of RHIC. The details on the MRPC design,the electronics chain and the first results obtained in $\sqrt{s_{NN}}$=200 GeV Cu+Cu collisions will be presented. [Preview Abstract] |
Tuesday, September 20, 2005 3:00PM - 3:15PM |
CJ.00005: Physics motivation for the Nose-Cone Calorimeter Upgrade to the PHENIX Forward Spectrometers Kenneth Barish The nose-cone calorimeter upgrade to the PHENIX forward spectrometers aims to add capabilities at forward rapidity in order to: (a) significantly extend the acceptance for high p$_T$ jet-photon measurements (jet tomography) in A+A, (b) increase our capabilities to measure the production quarkonium states in A+A collisions by giving sensitivity to the $\chi_c$ through the J/$\psi + \gamma$ channel and by providing a trigger with increased rejection for $\psi\to \mu\mu$, (c) study nucleon structure in nuclei at high parton densities in p+A collisions through the measurement of photons and neutral pions in the forward region, and (d) significantly extend the kinematic reach of PHENIX's $\Delta$G measurement for the prompt photon channel. The nose cone calorimeters, which will cover $0.9 < | \eta | < 3.0$, will be tungsten-silicon sampling calorimeters with an electromagnetic and shallow hadronic compartment. They will expands PHENIX's kinematical coverage for jets, inclusive neutral pions, electrons, and photons to forward rapidity and are designed to take advantage of the highest luminosity p+p, d+A, and A+A collisions. In this talk, we will discuss the physics motivation of the upgrade. [Preview Abstract] |
Tuesday, September 20, 2005 3:15PM - 3:30PM |
CJ.00006: PHENIX Silicon Vertex Tracker Robert Pak The PHENIX detector at RHIC will be upgraded with a silicon vertex tracker, greatly enhancing the capability to investigate the hot and dense nuclear matter formed in heavy ion collisions as well as significantly improving measurement of the proton spin structure in polarized proton-proton collisions. The vertex tracker will allow direct measurement of heavy quark production by providing the displacement of decay vertices from the primary interaction point. The detector design is comprised of a four-layer barrel, with two inner pixel sensor layers and two outer strip sensor layers, and umbrella-shaped endcaps consisting of mini-strip sensors. This presentation will outline the physics capability added to PHENIX by the new silicon vertex tracker, the technology choices in the design, and the current status of the project. [Preview Abstract] |
Tuesday, September 20, 2005 3:30PM - 3:45PM |
CJ.00007: Calorimetry for the PHENIX Forward Upgrade Vasily Dzhordzhadze The PHENIX muon program can be sufficiently extended by addition of the calorimetry in the forward direction. The Tungsten calorimeters with silicon pixel readout and fine segmentation are proposed to achieve the goal. The proposed calorimeter will cover a rapidity range of 0.9-3.0, increasing the coverage of the muon system (1.2$<\eta<$2.4). The calorimeter will comprise of two parts: electromagnetic and hadronic, with high resolution position (150 mkm) detectors placed inside. This will extend PHENIX's kinematical coverage for photons, $\pi^0$, electrons and jets at forward rapidity. It will greatly extend high p$_T$ jet-photon measurements in A+A collisions, will increase the capabilities to measure the production of quarkonium states in A+A collisions by giving sensitivity to the $\chi_c$ through the J/$\psi+\gamma$ channel and study nucleon structure in nuclei at high parton densities in p+A collisions through the measurement of $gamma$s and $\pi^0$s in the forward region. The calorimeter will provide a good pion rejection, fast trigger and improve muon momentum resolution. In this talk we discuss the calorimeter design, its anticipated performance and ongoing R\&D program together with the physics motivation of the device. [Preview Abstract] |
Tuesday, September 20, 2005 3:45PM - 4:00PM |
CJ.00008: Physics Capabilities of the PHENIX Muon Trigger Upgrade Rusty Towell While significant progress has been made in understanding the structure of the nucleon, many important questions remain including the origin of the proton spin. Plans have been made to develop a new state-of-the-art trigger system for the PHENIX muon arms. With this new system a precise measurement of the flavor structure of the quark polarizations in the proton can be made via the observations of W-bosons in polarized proton-proton collisions. W-bosons can be detected in PHENIX through the appearance of a high-energy muon in one of the two existing muon spectrometers. The trigger upgrade is based on fast resistive plate counter stations. This talk will describe the proposed upgrade and some of the physics results that can be expected. [Preview Abstract] |
Tuesday, September 20, 2005 4:00PM - 4:15PM |
CJ.00009: Read out system for Drift Chamber using ASD chip Keisuke Yawata For make clear the strangeness photo-production process, $\gamma+n\rightarrow K^0+\Lambda$ ~reaction is very important. For research this reaction, we are now constructing Neutral Kaon Spectrometer. And in this spectrometer, we designed a large cylindrical Drift Chamber. Since the Drift Chamber is operated in a huge background from $\gamma \rightarrow e^+ e^-$ conversion, the integration time of an amplifier should be small. Therefore, we study a property of an ASD chip with the integration time of 16nsec(which has not been used for Drift Chamber). In this talk, I will talk about result of ASD chip research and the read out system of Drift Chamber. [Preview Abstract] |
Tuesday, September 20, 2005 4:15PM - 4:30PM |
CJ.00010: First results from the Silicon Strip Detector of the STAR experiment Joerg Reinnarth, Lilian Martin, Jonathan Bouchet A new Silicon Strip Detector (SSD) has been recently installed in the central part of the STAR experiment at RHIC. The detector enhances the tracking capabilities of the STAR experiment in this region by providing information on the positions of hits and on the ionization energy loss of charged particles. Specifically, the SSD improves the extrapolation of tracks in the Time Projection Chamber to the hits found in the Silicon~Vertex~Tracker. Innovative solutions for electronics, connections and mechanics required to fulfill the constraints of the STAR environment will be presented. The intrinsic performances of the SSD, its impact on the STAR physics capabilities and the significant improvement of the reconstruction efficiency~of~short-lived~hyperons~will~be~detailed. [Preview Abstract] |
Tuesday, September 20, 2005 4:30PM - 4:45PM |
CJ.00011: Improved Focal Plane at SASSYER Ryan Winkler, A. Heinz, J. Qian, H. Ai, R.F. Casten, E. Novitski, E.A. McCutchan, D.A. Meyer, V. Werner, E. Williams, R.B. Cakirli, C.R. Fitzpatrick, G. G\"{u}rdal, C. Beausang, B. Crider, R. Raabe The gas-filled recoil separator SASSYER (Small Angle Separator System at Yale for Evaporation Residues) is designed for the investigation of heavy evaporation residues produced in weak reaction channels. The detection systems around the target position as well as the focal plane are undergoing improvement. Until now, a solar cell array with 30 1x1 cm$^{2}$ detectors was used for the detection of recoils and served, together with several germanium detectors, as a setup for isomer-decay tagging (IDT). The redesigned focal plane will consist of a Parallel Grid Avalanche Counter (PGAC) that will be used in transmission together with two 6x4 cm$^{2}$ Double-sided Silicon Strip Detectors (DSSDs) with a 1 mm pitch covering the entire focal plane. A dedicated vacuum chamber allows for the positioning of clover detectors in close geometry. Here recoil-decay tagging, isomer-decay tagging and alpha-gamma coincidence measurements can be performed. The setup and first experimental results will be presented. This work has been supported by US DOE grants DE-FG02-91ER-40609, DE-FG02-88ER-40417, DE-FG03-03NA-00081, DE-FG02-05ER-41379, and DE-FG52-05NA-25929. [Preview Abstract] |
Tuesday, September 20, 2005 4:45PM - 5:00PM |
CJ.00012: An upgraded strangeness photo-production experiment near the threshold region at LNS-Tohoku. Masashi Kaneta We have studied strangeness photo-production by neutral kaon from the $\gamma$+$d$ reactions near the threshold region at Laboratory Nuclear Science (LNS), Tohoku Univ. The goal of our study is to investigate strangeness production mechanism by electro-magnetic interaction, which has not fully understood yet. So far the charged kaon production channel, $\gamma + p \rightarrow K^{+} + \Lambda (\Sigma)$ has been extensively studied and reliable experimental inputs were obtained. However, there exist no reliable data for the neutral kaon channel $\gamma + n \rightarrow K^{0}_{S} + \Lambda$. In order to have reliable data for the neutral kaon photo-production data, we focused on the $\gamma + n \rightarrow K^{0}_{S} + \Lambda$ channel using a deuteron target. In 2003 to 2004, we have taken data by Neutral Kaon Spectrometer (NKS) at LNS-Tohoku (see Kyo Tsukada's talk in detail). We are now constructing a new spectrometer (NKS2) to upgrade experiments of neutral kaon photo-production. The new spectrometer NKS2 covers larger acceptance as compared with NKS especially at forward angles. The estimated acceptance of NKS2 are twice (ten times) for $K^0_{S}$ ($\Lambda$) than that of NKS. With this advantage, we expect simultaneous measurements of $K^{0}_{S}$ and $\Lambda$. Additionally, we plan a Lambda polarization measurement and many strangeness production channels in $\gamma + n$ and $\gamma + p$. In this talk, we show the current status of the experiment, and explain our goal in detail. [Preview Abstract] |
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