PO —  Poster Session   (18-Jun-12   16:30—18:00)
Paper Title Page
PO02 GANIL Operation Status and Upgrade of SPIRAL1 51
  • F. Chautard, O. Bajeat, P. Delahaye, M. Dubois, P. Jardin, O. Kamalou, L. Maunoury, G. Sénécal
    GANIL, Caen, France
  The GANIL facility (Caen, France) is dedicated to the acceleration of heavy ion beams for nuclear physics, atomic physics, radiobiology and material irradiation. The production of stable and radioactive ion beams for nuclear physics studies represents the main part of the activity. The exotic beams are produced by the Isotope Separation On-Line method (ISOL, the SPIRAL1 facility) with SPIRAL1 facility. It is running since 2001, producing and post-accelerating radioactive ion beams. The review of the operation from 2001 to 2011 is presented. Because of the physicist demands, the facility is about to be improved with the project Upgrade SPIRAL1. The goal of the project is to extend the range of post-accelerated exotic beams avalaible.  
PO03 The RIB Dynamics of the SPIRAL 2 Transfer Line 54
  • D. Boutin, F.R. Osswald
    IPHC, Strasbourg Cedex 2, France
  • N.Yu. Kazarinov
    JINR, Dubna, Moscow Region, Russia
  • C. Peaucelle
    IN2P3 IPNL, Villeurbanne, France
  • T. Thuillier
    LPSC, Grenoble, France
  The design of the SPIRAL 2 RIB extraction and mass analysis results of previous experiences at Ganil (SIRa) and SPIRAL* and concerns the ISOL process. The layout presents different beam sections of optical interest starting with a conventional Einzel lens, a 1 T solenoid, a triplet of magnetic quadrupoles and a magnetic dipole for the mass analysis. The down-stream 1+ ions transfer line to the users is designed following a conservative solution composed of emittance limitation, homothetic betatron matching, passive and symmetrical optical lattices (point to point and unitary transport) as well as beam instrumentation enabling the control of the losses (pepperpots, slits, beam profilers, FC, etc.). The presentation will mainly focus on the description of the beam line, its characteristics and on some side effects which have to be taken into account in order to match the beam properly during the operations.
* On Line Isotopic Separator Test Benches at GANIL, R. Anne et al., PAC
proceed. ed. IEEE, 1993
PO04 The Darmstadt Multi-Frequency Digital Low Level RF System in Pulsed Application 58
  • R. Eichhorn, U. Bonnes, C. Burandt, M. Konrad, P.N. Nonn
    TU Darmstadt, Darmstadt, Germany
  • G. Schreiber, W. Vinzenz
    GSI, Darmstadt, Germany
  Funding: Work supported by DFG through CRC 634 and by the BMBF under 06 DA 9024 I
Triggered by the need to control the superconducting cavities of the S-DALINAC, the development of a digital low level RF control system was started several years ago. The chosen design proved to be very flexible since other frequencies than the original 3 GHz may be adapted easily: The system converts the RF signal coming from the cavity (e. g. 3 GHz) down to the base band using a hardware I/Q demodulator. The base band signals are digitized by ADCs and fed into a FPGA where the control algorithm is implemented. The resulting signals are I/Q modulated before they are sent back to the cavity. Meanwhile, this system has been successfully operated on 3 GHz, 6 GHz and 325 MHz cavities, on normal and superconducting cavities as well as in cw or pulsed mode. This contribution will focus on the 325 MHz version built to control a pulsed prototype test stand for the p-LINAC at FAIR and possible extensions to even lower frequencies. We will present the architecture of the RF control system as well as results obtained during operation.
PO05 Control and Information System for BARC – TIFR Superconducting LINAC Booster 62
  • S. Singh
    BARC, Mumbai, India
  • J.N. Karande, V. Nanal, R.G. Pillay
    TIFR, Mumbai, India
  • P. Singh
    LEHIPA Project, Physics Group, Mumbai, India
  Superconducting LINAC booster is modular machine which consists of 7 cryomodules each consisting four quarter wave resonators and one superbuncher module. The control system is a mixed distributed control system. Geometrical distributed system architecture has been followed for RF control. RF control has four local nodes( RF LCS) each nodes catering to two cryostat. Two additional nodes are made for beam line system and cryogenics distribution system, making it a systematic distribution system. The system is developed on Linux operating system but the software is portable on Linux and Microsoft windows. The software is developed in two layers namely scanner and operator interface. Scanners interacts with the interface hardware. All scanners are developed in JAVA , which is very challenging job looking towards the feature of JAVA. Various issues regarding this were closely investigated and solved to overcome the deficiency of JAVA .A micro-controller based board has been developed for cryogenics line distribution system. Different subsystems of the control system has been developed independently. A complete integration of the system will be completed before Dec 2012.  
PO06 Extension of Superconducting LINAC Operation to Lighter Beams 65
  • V. Nanal, R.D. Deshpande, P. Dhumal, J.N. Karande, R. Palit, R.G. Pillay, M.S. Pose, S.M. Powale, C. Rozario, S.K. Sarkar, M.E. Sawant, A.A. Shinde, S.R. Sinha, A.N. Takke
    TIFR, Mumbai, India
  • S. Singh
    LEHIPA Project, Physics Group, Mumbai, India
  The superconducting LINAC booster at Pelletron Linac Facility(Mumbai), has been fully operational since July 2007. The Liquid Helium Refrigeration plant for the LINAC has been upgraded to enhance the refrigeration capacity to ~450 Watts at 4.5K without LN2 pre-cool, from the earlier capacity of ~300 Watts. All beam lines in new user halls have been commissioned and new experimental setups have been added. Several experiments have been carried out using beams of 12C, 16O, 19F, 28Si, 31P. The QWR cavity is designed for β=0.1 and hence it is difficult to accelerate lighter beams. Due to growing interest in studying Li induced reactions on fissile targets at energies higher than 55 MeV, we have recently accelerated Li beam using four cryostat modules. Starting with 40 MeV Li beam from the pelletron, 56 MeV beam was successfully delivered at target station for a test experiment.  
PO09 Progress on the RFQ Beam Cooler Design for SPES Project 68
  • M.M. Maggiore, F. Chiurlotto, M. Comunian, A. Dainelli, M. De Lazzari, A. Galatà, A. Minarello, A.M. Porcellato, S. Stark
    INFN/LNL, Legnaro (PD), Italy
  The SPES project is the new Radioactive Ion Beam facility under construction at Laboratori Nazionali of Legnaro, Italy. In this framework in order to improve the beam quality in terms of transversa emittance and energy spread, a study of a new RFQ beam cooler device is in progress. The electromagnetic design of the RFQ section and the electrostatic layout of the injection and extraction regions have been done. The study about the beam dynamic is going on by means of dedicated codes which allow to take into account the interaction of the ions with the buffer gas needed to cool the beams. The preliminary design of the device is carrying on at LNL since 2011 and the feasibility study is funded by V committee of INFN in the framework of REGATA experiment. Both beam dynamics study and the electromagnetic design are presented in this work.  
PO10 Performance of ALPI New Medium Beta Resonators 73
  • A.M. Porcellato, F. Chiurlotto, M. De Lazzari, A. Palmieri, V. Palmieri, S. Stark, F. Stivanello
    INFN/LNL, Legnaro (PD), Italy
  All the Nb sputtered medium beta cavities installed up to the last year in ALPI were produced by upgrading of old previously Pb plated substrates. For the first time this year we had the opportunity to test on line four 160 MHz, β=0.11 QWRs which were designed and built in order to be Nb sputtered. These resonators were sputtered in between 2007 and 2008 and they were tested at low fields (up to 3 MV/m) just after their production when they showed Q-zero values exceeding 1xE9. They were then stored for about three years in plastic bags and installed in ALPI only this year. The on line tests that we performed after installation showed Q-zero values reduced of about a factor five with respect to the ones measured in laboratory. It is the first time we could pick out a Q deterioration caused by storage in air. So far we have not recognized any Q–degradation both when the sputtered cavities were maintained in vacuum for many years and also when they were open to air for a few weeks for cryostat maintenance. In such a case, as it happened in the maintenance of cryostat CR19 housing high beta resonators, we could instead find some improvements in the Q-curves.  
PO12 Damage Situation of the 12UD Pelletron Tandem Accelerator at the University of Tsukuba by the Great East Japan Earthquake 80
  • K. Sasa
    UTTAC, Tsukuba, Ibaraki, Japan
  The 12UD Pelletron tandem accelerator at the University of Tsukuba suffered serious damage from the Great East Japan Earthquake on 11 March 2011. On the day, the 12UD Pelletron tandem accelerator was in operation at 8 MV. A main tank of the 12 UD Pelletron tandem accelerator located from downstairs 4th floor to 7th floor was strongly shaken by the shock of the earthquake. All high voltage accelerating columns fell down in the accelerator tank. The situation of damage and a post-quake reconstruction project of the Tandem Accelerator Facility at the University of Tsukuba will be reported.  
PO13 Longitudinal Beam Motion in the KEK Digital Accelerator: Tracking Simulation and Experimental Results 83
  • X. Liu
    Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Japan
  • T. Adachi
    Sokendai, Ibaraki, Japan
  • S. Harada
    Tokyo City University, Tokyo, Japan
  • T. Iwashita
    KEK, Ibaraki, Japan
  • K. Takayama, T. Yoshimoto
    TIT, Yokohama, Japan
  Beam commissioning in the KEK Digital Accelerator*, which is a small scale induction synchrotron (IS), has been conducted since the middle of 2011. Longitudinal beam motion in the induction synchrotron, which utilizes induction cells (IC) for acceleration and confinement, is characterized as barrier bucket acceleration. . These ICs are driven by the switching power supply (SPS). Pulse voltage is fully managed by the gate control for solid-state switching elements in the SPS, where FPGAs and DSPs take a key role**. A tracking code has been developed to understand the longitudinal motion affected by longitudinal space charge forces, under programmed settings of confinement and acceleration voltage. This code, where the trigger control scenario is fully implemented, calculates temporal evolution of momentum and phase of macro-particles. The simulation result has well reproduced beam commissioning results, such as bunch squeezing experiment and barrier bucket acceleration. In addition, the code is going to be applied to explain the rapid growth of micro-bunch structure in the injected ion bunch.
* T. Iwashita et al., “KEK Digital Accelerator” , Phys. Rev. ST-AB 14, 071301 (2011). And K.Takayama et al., in this conference.
** S.Harada, Ms. Thesis (TCU) (2011).
PO14 Feedback of Slow Extraction in CSRm 89
  • J. Shi, W.P. Chai, J. Li, J.W. Xia, J.C. Yang, Y.J. Yuan
    IMP, Lanzhou, People's Republic of China
  The transverse tune of the beam in the synchrotron will fluctuate due to the quadrupole current ripple, which lead the spill ripple through the variation of the separatrices area. In order to reduce the ripple of the spill, a pair of fast response quadrupole (FQ) is adopted to compensate the tune ripple caused by other quadrupoles. After using the FQ feedback, the amplitude of the spill ripple within 800Hz has been reduced to 1/10 times from the normal mode. This method will be used in the HITFiL (Heavy Ion Therapy Facility in Lanzhou).  
  • S.J. Miller, J. Binkowski, A. Facco, M.J. Johnson, Y. Xu
    FRIB, East Lansing, Michigan, USA
  Funding: U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The driver linac design for the Facility for Rare Isotope Beams (FRIB) at Michigan State University (MSU) makes use of four optimized superconducting radio frequency (RF) resonators to accelerate exotic ions to 200 MeV/μ. The RF resonators were optimized using computer simulations for all expected physical encounters and corresponding electrical resonant frequency changes. Principal guidance from the ASME boiler and pressure vessel code (BPVC) were applied.
poster icon Poster PO16 [0.535 MB]  
PO17 Simulation of Electron and Ion Dynamics in an EBIS 97
  • L. Zhao, E.G. Evstati, J.S. Kim
    Far-Tech, Inc., San Diego, California, USA
  • E.N. Beebe, A.I. Pikin
    BNL, Upton, Long Island, New York, USA
  Funding: Grant supported by DOE office of Nuclear Physics
To model the dynamics of the ions in an Electron Beam Ion Source (EBIS), a time-dependent, self-consist particle-in-cell Monte Carlo code (EBIS-PIC) has been developed by FAR-TECH, Inc. The energetic background electron beam is modeled by PBGUNS (http://www.far-tech.com/pbguns/index.html) by dividing the long beam path into several segments to resolve the big length-to-radius spatial scaling problem. The injected primary ions and ionized neutral gas ions are tracked using Monte Carlo method which includes the ionization, charge-exchange and Coulomb collisions with the electron beam and the neutral gas in the potential well, which is calculated by solving the Poisson equation each time step. EBIS-PIC has been able to predict the spatial and velocity space distributions and the evolution of the charge state distribution (CSD) of trapped ions in EBIS devices operating in fast or slow trapping mode. The physical model of EBIS-PIC code and the simulations of the trapping and charge-breeding of injected Cs+1 ions on the Test EBIS* at BNL will be presented. The simulation results have shown good consistency with the experiments.
* S. Kondrashev, J.G. Alessi, E.N.Beebe, C. Dickerson, P.N.Ostroumov, A. Pikin, G. Savard, NIMPR. A, 642 (2011), 18-24.
PO18 Tandem EBIS 101
  • A.I. Pikin, J.G. Alessi, E.N. Beebe, M. Okamura, D. Raparia, J. Ritter, L. Snydstrup
    BNL, Upton, Long Island, New York, USA
  Funding: Work supported under the auspices of the US Department of Energy and the National Aeronautics and Space Administration.
A method to increase the ion beam intensity of RHIC EBIS by extending its ion trap into magnetic field of an additional superconducting solenoid is described. The strong axial support of the cold masses in these solenoids is required to place them on a common axis close to each other. Such configuration of solenoids allows to produce a long EBIS with a single electron gun, electron collector and injection system. Preliminary calculations of magnetic forces, magnetic field and potential distributions are presented along with proposed structure of the ion traps.