Bulletin of the American Physical Society
2016 Fall Meeting of the APS Division of Nuclear Physics
Volume 61, Number 13
Thursday–Sunday, October 13–16, 2016; Vancouver, BC, Canada
Session NG: Nuclear Instrumentation III |
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Chair: Matthew Posik, Temple University Room: Pavilion Ballroom B |
Sunday, October 16, 2016 8:30AM - 8:42AM |
NG.00001: Design and Simulation of a Polarized Pure Photon Source for Compton Scattering from Solid Polarized Targets Donal Day, Dustin Keller, Jixie Zhang Wide angle compton scattering from polarized protons holds great promise: access to the generalized parton distribution functions $\mathcal{\widetilde{H}}$ and $\mathcal{E}$ with different weighting and moments than in other hard exclusive processes, emphasizing the $u$-quarks and the valence region. Previously, experiments were proposed using bremsstrahlung from polarized electrons striking a radiator. Unfortunately the mixed electron-$\gamma$ beam limits the polarized target performance due to radiation damage and restricted luminosity owing to the heat load. We have designed a pure photon beam line by placing a dipole magnet after the radiator which deflects the electrons away from the target and into a beam dump. This approach has many benefits which include an order of magnitude increase in the photon luminosity and unrestricted use of transversely polarized targets while preserving robust target performance. We will discuss the physics motivation, the design (of two different options) as well as the G4beamline simulation results of the source. [Preview Abstract] |
Sunday, October 16, 2016 8:42AM - 8:54AM |
NG.00002: Commissioning and Operation of a Cryogenic Target at HI$\gamma$S David Kendellen We have developed a cryogenic target for use at the High Intensity $\gamma$-ray Source (HI$\gamma$S). The target system is able to liquefy helium-4 (LHe) at 4~K, hydrogen (LH$_2$) at 20~K, or deuterium (LD$_2$) at 23~K to fill a 0.3~L Kapton cell. Liquid temperatures and condenser pressures are recorded throughout each run in order to ensure that the target's areal density is known to $\sim$1\%. A low-temperature valve enables cycling between full and empty modes in less than 15 minutes. The target is being utilized in a series of experiments which probe the electromagnetic polarizabilities of the nucleon by Compton scattering high-energy photons from the liquid and detecting them with the HI$\gamma$S NaI Detector Array (HINDA). During a 50-hour-long commissioning run last fall, the target held LHe at 3.17~K, followed by a 300-hour-long production run this spring with LD$_2$ at 23.9~K. The design of the target will be presented and its performance during these two runs will be discussed. [Preview Abstract] |
Sunday, October 16, 2016 8:54AM - 9:06AM |
NG.00003: IRIS : A reaction spectroscopy facility with solid H_{2}/D_{2} target Matthias Holl, Ritu Kanungo, Martin Alcorta, Corina Andreoiu, Harris Bidaman, Christina Burbadge, Devin Burke, Alan Chen, Barry Davids, Alejandra Diaz Varela, Paul Garrett, Greg Hackman, Shigeru Ishimoto, Satbir Kaur, Matthew Keefe, Reiner Kruecken, Iymad Mansour, Jaspreet Randhawa, Alisher Sanetullaev, Alan Shotter, Jenna Smith, Junki Tanaka, Isao Tanihata, Joseph Turko, Orry Workman The charged particle reaction spectroscopy station IRIS at TRIUMF is designed to allow studies of inelastic scattering and transfer reactions for low intensity beams. To do so, a novel solid H$_2$/D$_2$ target is used in combination with a low pressure ionization chamber for the identification of incoming beam particles. The light ejectiles are measured using a $\Delta E-E$ telescope consisting of an annular silicon detector followed by CsI(Tl) array. Another $\Delta E-E$ telescope, consisting of two segmented silicon detectors, is used to identify the heavy outgoing particles. An overview of the faciltity will be given and examples from recent experiments that illustrate that facility’s capability for reaction studies of exotic nuclei will be shown. [Preview Abstract] |
Sunday, October 16, 2016 9:06AM - 9:18AM |
NG.00004: The sPHENIX Detector: Design and Performance Requirements Eric Mannel A new detector, sPHENIX, is being proposed to explore the quark-gluon plasma through measurements of jet properties in heavy ion collisions at the Relativistic Heavy Ion Collider, RHIC, at Brookhaven National Laboratory. The detector is based on the 1.5T super conducting solenoid magnet formerly used for the BaBar experiment and provides charged particle tracking, electromagnetic and hadronic calorimetry with a high speed data acquisition system capable of recording data at rates up to 15 KHz. In this talk we will present the performance requirements of the calorimeters and tracking systems, along with preliminary results from prototype tests at the Fermilab Test Beam Facility and future prospects for sPHENIX [Preview Abstract] |
Sunday, October 16, 2016 9:18AM - 9:30AM |
NG.00005: A TPC for sPHENIX at RHIC Niveditha Ramasubramanian, Klaus Dehmelt The sPHENIX detector is being proposed at the Relativistic Heavy Ion Collider to measure jets and upsilons for advancing our understanding of the quark gluon plasma formed in heavy ion collisions. It is also expected to form the basis of a day-1 detector for a future U.S. Electron Ion Collider. sPHENIX is based on a superconducting solenoidal magnet formerly used by the BaBar experiment, and of charged particle tracking, electromagnetic as well as hadronic calorimetry. It covers a large acceptance, 2$\pi$ in azimuth and pseudorapidities of $|\eta| < $ 1, and allows to acquire data at a rate of up to 15 kHz. Furthermore, a Gas Electron Multiplier based Time Projection Chamber has been proposed to improve tracking resolution in a high multiplicity environment. In this talk we will present the current design and status of ongoing R&D and simulation studies for tracking with a TPC. [Preview Abstract] |
Sunday, October 16, 2016 9:30AM - 9:42AM |
NG.00006: ABSTRACT WITHDRAWN |
Sunday, October 16, 2016 9:42AM - 9:54AM |
NG.00007: Performance Study of a Prototype Modular RICH Detector for EIC Experiments Cheuk-Ping Wong A PID consortium (called eRD$14$) has been formed to explore the frontier of particle identification technologies for the future Electron Ion Collider (EIC) experiments. A modular RICH detector prototype has been designed and constructed for identifying pions and kaons in the momentum range of $3$ to $10$ GeV/c. The main components of this detector that include a block of aerogel, a Fresnel lens, a four-sided mirror set, and a photosensor plane, are fitted in a $10\text{cm}\times10\text{cm}\times10\text{cm}$ volume. The prototype was tested at Fermilab in April of $2016$. The preliminary results from this beam test and the comparison with Geant$4$ simulation results will be presented in this talk. [Preview Abstract] |
Sunday, October 16, 2016 9:54AM - 10:06AM |
NG.00008: Radiofrequency quadrupole-based beam cooler and buncher for the CANREB project at TRIUMF Brad Barquest, Matt Pearson, Friedhelm Ames, Jens Dilling, Gerald Gwinner, Rituparna Kanungo, Reiner Kruecken A new radiofrequency quadrupole-based ion beam cooler and buncher (BCB) and pulsed drift tube (PDT) have been designed as part of the CANREB project at TRIUMF. The BCB is designed to accept continuous 60 keV rare isotope beams from the ARIEL or ISAC production targets and efficiently deliver low-emittance, bunched beams of up to 10$^{\mathrm{7}}$ ions per bunch to an electron beam ion source (EBIS) to charge-breed the bunch for post-acceleration. The PDT will adjust the energy of the bunched beam from 60 keV to 10-14 keV for injection into the EBIS. The injection energy is determined by the acceptance of the post-accelerating RFQ. The design of the BCB is nearing completion, and fabrication and assembly effort will proceed shortly. In addition, a PDT prototype is under development to test that the design concept satisfies the voltage and switching time requirements. Design features of the BCB and PDT will be discussed, and an update on BCB assembly and PDT testing progress will be presented. [Preview Abstract] |
Sunday, October 16, 2016 10:06AM - 10:18AM |
NG.00009: Shaping of nested potentials for electron cooling of highly-charged ions in a cooler Penning trap Stefan Paul, Brian Kootte, Daniel Lascar, Gerald Gwinner, Jens Dilling TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN) is dedicated to mass spectrometry and decay spectroscopy of short-lived radioactive nuclides in a series of ion traps including a precision Penning trap. In order to boost the achievable precision of mass measurements TITAN deploys an Electron Beam Ion Trap (EBIT) providing Highly-Charged Ions (HCI). However, the charge breeding process in the EBIT leads to an increase in the ion bunch's energy spread which is detrimental to the overall precision gain. To reduce this effect a new cylindrical Cooler PEnning Trap (CPET) is being commissioned to sympathetically cool the HCI via a simultaneously trapped electron plasma. Simultaneous trapping of ions and electrons requires a high level of control over the nested potential landscape and sophisticated switching schemes for the voltages on CPET's multiple ring electrodes. For this purpose, we are currently setting up a new experimental control system for multi-channel voltage switching. The control system employs a Raspberry Pi communicating with a digital-to-analog board via a serial peripheral interface. We report on the implementation of the voltage control system and its performance with respect to electron and ion manipulation in CPET. [Preview Abstract] |
Sunday, October 16, 2016 10:18AM - 10:30AM |
NG.00010: Laboratory measurements of K-shell transitions in highly charged iron ions Ren\'e Steinbr\"ugge, Jan K. Rudolph, Sven Bernitt, Jos\'e R. Crespo L\'opez-Urrutia The x-ray spectra of celestial sources show a plethora of features originating from highly charged ions. These can be used to determine the flow, temperatures, and abundances of elements in the star, which are needed to benchmark-stellar evolution models. However, the underlying atomic transition data of the ions are often only known by theoretical calculations, thus testing them in laboratory measurements is crucial. We present our measurements of energies, natural linewidths\footnote{J. K. Rudolph et al., Phys. Rev. Lett. 111, 103002 (2013)}, radiative and Auger decay rates\footnote{R. Steinbr\"ugge et al., Phys. Rev. A 91, 032502 (2015)} for K-shell transitions in He-like to F-like iron ions. In this experiments, an electron beam ion trap was used to create a target of highly charged ions, which were resonantly excited by monochromatic light from the PETRA III synchrotron radiation source. Fluorescence was observed while simultaneously detecting photoionization by the change in the ionic charge state. This method, combined with the high resolution of the monochromator used, yields uncertainties on the ppm-level for the excitation energies and below 10\% for the linewidths and transition rates, thus providing a valuable benchmark for atomic theory. [Preview Abstract] |
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