Machine Parameter Measurements
Paper Title Page
Developments from the World of High Energy Physics of Interest for Beam Instrumentation  
  • G. Taylor
    The University of Melbourne, Melbourne, Victoria, Australia
  Someone from Asia working on HEP detector upgrades for LHC or SuperKEK-B.  
slides icon Slides MOALA02 [21.126 MB]  
A Compact Weather Station for Monitoring Environmental Effects on Beam Properties and Equipment  
  • S. Cunningham, R. Clarken, A. C. Starritt
    ASCo, Clayton, Victoria, Australia
  • A. C. Starritt
    SLSA, Clayton, Australia
  A compact and mobile weather station has been designed and integrated with EPICS to assist with environmental monitoring at the Australian Synchrotron. This proved invaluable in correlating the dependence of the Storage Ring RF phase with humidity. The device is based on Arduino technology and consists entirely of substitutable parts allowing for easy repair and maintenance by people of any degree of technical skill. The project aim is to deploy several of these devices throughout the facility to enhance the understanding of environmental effects on beam properties and equipment.  
poster icon Poster MOPB002 [0.602 MB]  
Development of RF Peak Detector and Phase Monitoring Unit at the Australian Synchrotron.  
  • A. Michalczyk
    ASCo, Clayton, Victoria, Australia
  • N.J. Basten, R.T. Dowd, G. LeBlanc, R. LeGuen, A. C. Starritt, K. Zingre
    SLSA, Clayton, Australia
  An RF peak detector and phase monitoring unit was developed as a part of the LINAC and Booster RF diagnostic system at the Australian Synchrotron (AS). The system captures a maximum of 16-pulsed or continuous RF signals to measure forward and reverse power levels. This unit has also I/Q demodulator, which provides phase information to assist with tuning and allows to diagnose instabilities. The design and development of this system will be presented in this poster. This novel 'in-house' designed LINAC and Booster RF Peak Detector and Phase Monitoring unit has been operating successfully since May 2012. The compact system provides excellent performance, EMC and thermal stability using only convectional cooling. The system has already proven to be a great diagnostic tool for trouble-shooting.  
poster icon Poster MOPB004 [1.069 MB]  
MOPB012 Vector Polarimeter for Photons in keV-MeV Energy Range 1
  • V. Gharibyan, K. Flöttmann, G. Kube, K. Wittenburg
    DESY, Hamburg, Germany
  Light's linear and circular polarizations are analyzed simultaneously by vector polarimeters mainly in astrophysics. At higher energies Compton scattering or absorption is applied for linear or circular polarization measurements in satellites and accelerators. Here we propose a Compton scattering only vector polarimeter for monitoring photon beams in a non-invasive way. The setup is adjustable to match the initial photons' energy and can be used for diagnosing electrons' passage through undulators. In perspective the proposed device could also be explored to measure topological charge of the novel vortex photon beams.  
MOPB026 Phase and Energy Measurement System for C-ADS Injector I 1
  • J.H. Yue, Q.Y. Deng, J. Hu, S.J. Wei, Q. Ye
    IHEP, People's Republic of China
  For proton linac, phase and energy measurement is very important. Beam phase always can be measured by quadrature sampling, energy can be measured by the method of time of flight (TOF), in this way we need to know the beam phase of two points whose distance is given. C-ADS injector I is a 10MeV proton linac with 10mA continuous current. It consists of an ECR (Electron Cyclotron Resonance) ion source, a LEBT (Low Energy Beam Transport), a 3MeV RFQ (Radio-frequency Quadruple) and a superconductivity linac accelerator with 3~10MeV. In the initial phase, the beam energy is about 3MeV. In this paper, phase and beam energy system of C-ADS Injector I have been introduced and some preliminary results have been shown.  
MOPB041 Study of the Transverse Beam Emittance of the Bern Medical Cyclotron 1
  • K.P. Nesteruk, M. Auger, S. Braccini, T.S. Carzaniga, A. Ereditato, P. Scampoli
    LHEP, Bern, Switzerland
  • P. Scampoli
    Naples University Federico II, Napoli, Italy
  The cyclotron laboratory for radioisotope production and multi-disciplinary research at the Bern University Hospital (Inselspital) features an IBA Cyclone 18 MeV proton cyclotron equipped with a Beam Transport Line (BTL), ending in a separate bunker. The horizontal and vertical transverse beam emittances were measured for the first time for this kind of accelerator. Two different techniques were used. A measurement based on quadrupole strength variation and beam width assessment after the last focusing section on the BTL was first performed. A second technique was developed employing 4 beam profilers located at successive positions around a beam waist. These novel beam profile detectors were developed by our group and are based on doped silica and optical fibers. For the data analysis, a statistical approach allowing for estimation of the RMS transverse emittance of a beam with an arbitrary density profile was applied. The results obtained with both methods were found to be in good agreement.  
poster icon Poster MOPB041 [1.628 MB]  
MOPB046 First K-Modulation Measurements in the LHC During Run 2 1
  • M. Kuhn, V. Kain, A. Langner, R. Tomás
    CERN, Geneva, Switzerland
  Several measurement techniques for optics functions have been developed for the LHC. This paper discusses the first results with a new k-modulation measurement tool. A fully automatic and online measurement system has been developed for the LHC. It takes constraints of various systems such as tune measurement precision and powering limits of the LHC superconducting circuits into account. K-modulation with sinusoidal excitation will also be possible. This paper presents the first k-modulation and β* measurement results in the LHC in 2015. In addition, the measured beta functions will be compared to results from the turn-by-turn phase advance method.  
poster icon Poster MOPB046 [0.555 MB]  
MOPB056 Improvement of Tune Measurement System at Siam Photon Source 1
  • S. Kongtawong, P. Klysubun, S. Krainara, P. Sudmuang
    SLRI, Nakhon Ratchasima, Thailand
  Funding: Synchrotron Light Research Institute (SLRI) (Thailand)
A new tune measurement system was recently developed and implemented at Siam Photon Source (SPS) for both the booster synchrotron and the 1.2 GeV electron storage ring. A new electronic module was installed at the SPS booster for collecting the turn-by-turn signal generated when the beam is excited with white noise and fast kicker. The beam excitation was carefully studied in order to determine the optimum beam response. With this system we observed the variation of the tune during energy ramping. The measurement provides information needed to optimise the working tune and to keep it constant. At the SPS storage ring, the excitation signal was changed from swept frequency signal to frequency modulation (FM) signal to reduce the measurement time. Details of the instrumentation setup and its performance will be presented in this report.
poster icon Poster MOPB056 [1.862 MB]  
TUALA02 Transverse Profiling of an Intense FEL X-Ray Beam Using a Probe Electron Beam 1
  • P. Krejcik
    SLAC, Menlo Park, California, USA
  Funding: This work was supported by Department of Energy Contract No. DE-AC0276SF00515
Monitoring the pulse by pulse output intensity and profile of an FEL is a critical measurement both for users and for optimising the accelerator drive beam. The diagnostic challenge is to find a technique that is not susceptible to damage at high output power, is noninvasive and can be performed at high repetition rates. Fluorescent screens are invasive, susceptible to damage and limited in repetition rate by the camera readout. Gas cell monitors are noninvasive but only yield intensity information and suffer from residual ionisation at high repetition rates. The technique described here uses the scattering of a beam of low-energy electrons as they are scanned across the photon beam to measure the transverse intensity profile of the photon beam. Two different geometries are compared. One is where a finely focused electron beam is scanned transversely across the photon beam to measure the transverse profile. The second is where the electrons are bent onto the axis of the photon beam and are scattered by the counter propagating beam of photons. Here the electron beam is kept larger in diameter than the photon beam so that the photon pulse intensity can be measured by the scattering.
slides icon Slides TUALA02 [2.848 MB]