Bulletin of the American Physical Society
2011 Fall Meeting of the APS Division of Nuclear Physics
Volume 56, Number 12
Wednesday–Saturday, October 26–29, 2011; East Lansing, Michigan
Session GD: Instrumentation IV |
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Chair: Donald Isenhower, Abilene Christan University Room: Heritage |
Friday, October 28, 2011 8:30AM - 8:42AM |
GD.00001: Developing a fast ionization chamber for transfer reaction studies K.Y. Chae, D.W. Bardayan, M.S. Smith, K.T. Schmitt, S.H. Ahn, W.A. Peters, S. Strauss Detection of beam and beam like recoils at far forward angles is often critical for radioactive beam measurements in inverse kinematics. Gas-filled ionization chambers are well suited for these applications, since they have moderately good energy resolution and can take prolonged exposure to beam compared to fragile semiconductor detectors. Conventional ion counters using a Frisch grid, however, have slow response times because the ionized electrons must travel long distances to the anodes. To reduce response times, a fast ion counter using a tilted window and tilted electrodes was developed and tested at ORNL's Holifield Radioactive Ion Beam Facility, modified from an original design by Kimura et al. [1]. The maximum counting rate and energy resolution, along with future plans for using the new ion counter, will be presented. \\[4pt] [1] K. Kimura et al., Nucl. Inst. Meth. Phys. Res. A 538, 608 (2005). [Preview Abstract] |
Friday, October 28, 2011 8:42AM - 8:54AM |
GD.00002: Photon Detection System for Collinear Laser Spectroscopy at NSCL Sophia Vinnikova, Christopher Geppert, Michael Hammen, Andrew Klose, Jorg Kramer, Wilfried Nortershauser, Paul Mantica, Kei Minamisono, Anthony Schneider A photon detection system has been designed and fabricated for the BEam COoler and COllinear LAser spectroscopy (BECOLA) facility at NSCL to work over the wavelength ranges of 350-500 nm and 700-1000 nm. The detection system is based on a design from the University of Mainz and relies on an ellipsoidal reflector to focus fluorescence from the atom/ion beam passing through the first focal point to a photomultiplier tube located at the second focal point. An aperture system will be used to reduce background caused by stray laser light. Ray trace simulations and measurement of stray light characteristics will be discussed. This research is funded in part by NSF grant PHY 06-06007. [Preview Abstract] |
Friday, October 28, 2011 8:54AM - 9:06AM |
GD.00003: Performance of the X-ARRAY at ANL A.Y. Deo, C.J. Lister, P. Chowdhury, F.G. Kondev, P.F. Bertone, K. Teh, S. Lakshmi, G.J. Lane, E. McCutchan, C. Nair, D. Seweryniak, M.L. Smith, S. Zhu The X-ARRAY is a versatile and efficient HpGe array consisting of a Eurisys Superclover made of four 70 mm diameter n-type germanium crystals and and 4 regular clover detectors based on 60 mm technology. Both the array and its electronics are compact and can be easily moved. It has been used extensively at the Argonne Fragment Mass Analyzer (FMA) and will be an integral part of the CARIBU decay station for beta-gamma spectroscopy of neutron-rich nuclei. In order to process signals from the array, a CAMAC-based data acquisition system, SCARLET, is used. The overall performance of the array and SCARLET will be discussed. [Preview Abstract] |
Friday, October 28, 2011 9:06AM - 9:18AM |
GD.00004: Digital Data Acquisition System for Gammasphere M.P. Carpenter, M. Alcorta, J.T. Anderson, C.R. Hofman, R.V.F. Janssens, T.L. Khoo, A. Kreps, T. Lauritsen, C.J. Lister, D. Seweryniak, P. Wilt, S. Zhu, M. Cromaz, C. Lionberger, I.Y. Lee A new digital-based data acquisition system for Gammasphere is under development. This system leverages the electronics designed for the GRETINA collaboration. At the center of this development are the GRETINA 10-channel digitizer modules which digitize the Ge preamp signals at a 100MHz rate [1]. The new DAQ will increase event throughput significantly over the existing system while addressing multiple repair and maintenance issues. New hardware and firmware to integrate the GRETINA electronics with Gammasphere has been developed allowing for a staged changeover so that the experimental program will not be adversely affected. In the first phase of the project, both the current VXI based analog system and the digital DAQ will run in parallel and share a common trigger and clock. The current status of the project and results from first in-beams tests of the phase I system will be presented. This research is supported by the DOE Office of Nuclear Physics under Contract No. DE-AC02-06CH11357. \\[4pt] [1] J.T. Anderson \textit{et al., }IEEE Transactions on Nuclear Science, vol. 56, issue 1, pp. 258-265. [Preview Abstract] |
Friday, October 28, 2011 9:18AM - 9:30AM |
GD.00005: Digital Electronics Equipment for the RIPEN Apparatus Tommaso Marchi, Fabiana Gramegna, Marco Cinausero, Vladimir Kravchuk, Gianmaria Collazuol The RIPEN apparatus is a neutron detector array composed of BC501 liquid scintillators specifically suited for neutron detection and time of flight measurement. It was installed at Legnaro National Laboratory in early `90s, while the last measurement campaign was performed in 2007. At present the apparatus is undergoing a process of complete substitution of readout/acquisition electronics. The capabilities of digital electronics have been tested using CAEN V1720 VME digitizers (12 bit, 250MS/s). Analogue RC/CR emulation filters have been developed to perform neutron/$\gamma $ discrimination: zero crossing technique as well as gate integrated method have been implemented. Signal interpolation routines allowed to obtain also $\sim $1 ns timing performances. During June 2011 a subset of 8 detectors was successfully used to perform an in-beam experiment to measure neutron production cross sections. This required the use of 2 VME synchronized acquisition boards and the development of a specific on-line analysis software. We will present a short description of the RIPEN apparatus at LNL and the digital electronic setup. Specifically developed pulse shape algorithms will also be illustrated, as well as the results obtained in calibration and in-beam measurements. [Preview Abstract] |
Friday, October 28, 2011 9:30AM - 9:42AM |
GD.00006: Monte-Carlo simulation and acceptance calculation on NSCL charge breeder electron beam ion trap Kritsada Kittimanapun, Georg Bollen, Alain Lapierre, Stefan Schwarz The NSCL charge breeder electron-beam ion trap (NSCL-EBIT) is constructed as the first part of the post acceleration ReA project at the National Superconducting Cyclotron Laboratory (NSCL) to study the key reactions in nuclear astrophysics and Coulomb excitation. The NSCL-EBIT is designed to operate with 6-T maximum magnetic field strength in the trap center and provide high electron beam current density up to 10$^{4}$ A/cm$^{2}$ for fast charge breeding. To reach maximum efficiency, acceptance calculations have been done and charge evolution by electron impact ionization based on Monte-Carlo method is implemented. Optimization of electric potential distributions and different magnetic-field configurations are investigated. Acceptance for 0.8 A and 2.5 A electron current are 65{\%} and 85{\%} for an injected ion beam of 10$\pi $ mm-mrad, respectively, and the breeding time for Ca$^{15+}$ is approximately 0.7 ms. [Preview Abstract] |
Friday, October 28, 2011 9:42AM - 9:54AM |
GD.00007: The EBIT charge breeder at NSCL Alain Lapierre, Stefan Schwarz, Kritsada Kittimanapun, Georg Bollen, Oliver Kester The National Superconducting Cyclotron Laboratory (NSCL) is finalizing ReA to reaccelerate rare-isotope beams to energies of $\sim $0.3-20 MeV/u. ReA consists of an electron-beam ion source / trap (EBIS/T), a mass separator, a radio-frequency quadrupole (RFQ) pre-accelerator, and a superconducting radio-frequency linear accelerator (SRF-LINAC). By increasing the charge of ions injected into the RFQ and SRF-LINAC, this charge breeder is a key component to provide a compact and cost-efficient reaccelerator. The ReA EBIT has started producing highly charged ion beams. It is equipped with an electron gun yielding a few amperes and a magnet configuration made of Helmholtz coils and a solenoid, providing a maximum magnetic field strength of 6 T. The solenoid magnet configuration will guarantee high beam acceptance. The combination of a high-current gun and strong magnetic field will allow this EBIS/T to reach high electron current densities suitable to rapidly increase the charge of short-lived isotopes within tens of milliseconds. The status of the EBIT will be presented. [Preview Abstract] |
Friday, October 28, 2011 9:54AM - 10:06AM |
GD.00008: Collinear Laser Spectroscopy at the BECOLA Facility Anthony Schneider, Andrew Klose, Paul Mantica, Sophia Vinnikova, Kei Minamisono The BEam COoler and LAser spectroscopy (BECOLA) facility has been constructed at NSCL to measure the hyperfine structure of nuclei and deduce moments and charge radii. A Colutron off-line ion source is being used to produce stable isotope beams to commission the collinear laser beam line. Laser light is transported to the beam line via fiber optic cable and is collinearly aligned with the stable, low-energy ($<$ 60 keV) beam. The hyperfine structure is extracted by observing the fluorescence as a function of the acceleration voltage of the beam, which is equivalent to scanning the laser frequencies due to the Doppler Effect. The operational characteristics and controls of the off-line source and collinear beam line will be discussed. This work is supported in part by NSF grant PHY-06-06007. [Preview Abstract] |
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