Keyword: diagnostics
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MOOAA02 Instrumentation and Diagnostics for High Repetition Rate Linac-driven FELs linac, FEL, emittance, laser 23
 
  • J.M. Byrd, S. De Santis, L.R. Doolittle, D. Filippetto, G. Huang, M. Placidi, A. Ratti
    LBNL, Berkeley, California, USA
  
  Funding: Work supported by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
One of the concepts for the next generation of linac-driven FELs is a cw superconducting linac driving an electron beam with MHz repetition rates. The beam is then switched into an array of independently configurable FELs. The demand for high brightness beams and the high rep-rate presents a number of challenges for the instrumentation and diagnostics. The high rep-rate also presents opportunities for increased beam stability because of the ability for much higher sampling rates for beam-based feedbacks. In this paper, we present our plans for instrumentation and diagnostics for such a machine. 		 
slides icon Slides MOOAA02 [1.710 MB]  
 
MOEPPB005 Initial Commissioning of NDCX-II induction, solenoid, ion, beam-transport 85
 
  • S.M. Lidia, D. Arbelaez, W.G. Greenway, J.-Y. Jung, J.W. Kwan, T.M. Lipton, A. Pekedis, P.K. Roy, P.A. Seidl, J.H. Takakuwa, W.L. Waldron
    LBNL, Berkeley, California, USA
  • A. Friedman, D.P. Grote, W. M. Sharp
    LLNL, Livermore, California, USA
  • E.P. Gilson
    PPPL, Princeton, New Jersey, USA
  
  Funding: This work was performed under the auspices of the U.S Department of Energy by LLNL under contract DE AC52 07NA27344, and by LBNL under contract. DE-AC02-05CH11231.
The Neutralized Drift Compression Experiment-II (NDCX-II) will generate ion beam pulses for studies of Warm Dense Matter and heavy-ion-driven Inertial Fusion Energy. The machine will accelerate 20-50 nC of Li+ to 1.2-3 MeV energy, starting from a 10.9-cm alumino-silicate ion source. At the end of the accelerator the ions are focused to a sub-mm spot size onto a thin foil (planar) target. The pulse duration is compressed from ~500 ns at the source to sub-ns at the target following beam transport in a neutralizing plasma. We first describe the injector, accelerator, transport, final focus and diagnostic facilities. We then report on the results of early commissioning studies that characterize beam quality and beam transport, acceleration waveform shaping and beam current evolution. We present WARP simulation results to benchmark against the experimental measurements. 		 
 
MOPPD001 Accelerator R&D in the QUASAR Group antiproton, storage-ring, niobium, instrumentation 364
 
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  
  Funding: Work supported by the Helmholtz Association and GSI under contract VH-NG-328, the EU under contracts PITN-GA-2008-215080, PITN-GA-2011-289191, PITN-GA-2011-289485 and STFC.
The QUASAR Group was founded in 2007 with an initial focus on the development and experimental exploitation of a novel electrostatic ultra-low energy storage ring (USR), part of the future facility for low-energy antiproton and ion research (FLAIR). The group's research activities have grown considerably over the past four years and now include also the development of beam diagnostic tools for accelerators and light sources, investigations into superconducting linear accelerators and medical applications, and, most recently, a broad R&D program into laser applications at accelerators. In this contribution, an overview of the QUASAR Group’s research achievements to date is given. 		 
 
MOPPD003 DITANET - An International Network in Beam Diagnostics emittance, instrumentation, simulation, monitoring 370
 
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  
  Funding: Work supported by the European Union under contract PITN-GA-2008-215080.
DITANET is the largest-ever EU funded research and training network in beam diagnostics. It brings together universities, research centers and industry partners to jointly develop diagnostics methods for a wide range of existing or future particle accelerators. This is achieved through a cohesive approach that allows for the exploitation of synergies, whilst promoting knowledge exchange between partners. In addition to its broad research program, the network organizes a large number of international schools and topical workshops for the beam instrumentation and particle accelerator communities. The project comes to an end in May 2012. This contribution presents some of the network's recent research outcomes and training activities. 		 
 
MOPPD048 Ribbon Electron Beam Profile Monitor for Bunched Beam Tomography electron, cathode, proton, ion 472
 
  • V.G. Dudnikov
    Muons, Inc, Batavia, USA
  • A.V. Aleksandrov
    ORNL, Oak Ridge, Tennessee, USA
  
  Funding: Work supported by Contract DE-AC05-00OR22725 and by STTR grant DE-SC0007559
Advanced beam diagnostics are essential for high performance accelerator beam production and for reliable accelerator operation. It is important to have noninvasive diagnostics which can be used continuously with intense beams of accelerated particles. Recently, an electron probe was successfully used to determine accelerated particle density distributions. However, the apparatus used for this diagnostic is large and complex which restricts its wider use for tomography of accelerated bunches. We propose to use a strip cathode is for ribbon electron beam formation instead of a scanning of pencil beam used in the previous electron probe bunch profile monitors. The apparatus with the strip cathode is smaller, has simpler design and less expensive manufacturing, can have better magnetic shielding, higher sensitivity, higher resolution, can have better measurement accuracy and better time resolution. With this device it is possible to develop almost ideal tomography diagnostics of bunches in linear accelerators and in circular accelerators and storage rings. 		 
 
MOPPP033 Diagnostics at PITZ 2.0 Beamline: Status and New Developments emittance, electron, dipole, FEL 634
 
  • M. Otevřel, A. Donat, H.-J. Grabosch, M. Groß, L. Hakobyan, H.M. Henschel, L. Jachmann, M. Khojoyan, G. Klemz, W. Köhler, G. Koss, G. Kourkafas, M. Krasilnikov, K. Kusoljariyakul, H. Leich, J. Li, M. Mahgoub, D. Malyutin, B. Marchetti, J. Meissner, A. Oppelt, M. Penno, B. Petrosyan, M. Pohl, S. Riemann, M. Sachwitz, B. Schöneich, J. Schultze, A. Shapovalov, F. Stephan, F. Tonisch, G. Vashchenko, L.V. Vu, T. Walter, S. Weisse, R.W. Wenndorff, M. Winde
    DESY Zeuthen, Zeuthen, Germany
  • G. Asova
    INRNE, Sofia, Bulgaria
  • N.I. Brusova, L.V. Kravchuk, V.V. Paramonov
    RAS/INR, Moscow, Russia
  • A. Gonnin, M. Joré, B. Mercier, C. Prevost, A. Variola
    LAL, Orsay, France
  • I.I. Isaev
    MEPhI, Moscow, Russia
  • Ye. Ivanisenko
    IERT, Kharkov, Ukraine
  • D. Richter
    HZB, Berlin, Germany
  • S. Rimjaem
    Chiang Mai University, Chiang Mai, Thailand
  • A.A. Zavadtsev, D.A. Zavadtsev
    Nano, Moscow, Russia
  
  The main aim of the Photo Injector Test Facility at DESY, Zeuthen (PITZ) site is to develop and test an FEL photo injector system capable of producing high charge short electron bunches of lowest possible transverse emittance to allow optimum FEL performance. The last major beamline upgrade realized in the second half of the year 2011 completed the evolution of the PITZ setup ongoing since 2005. The most recent upgrades include the installation of a new RF deflecting cavity - a prerequisite for longitudinal emittance and high resolution slice emittance measurements and installation of a new dispersive section for longitudinal phase space diagnostics of the high energy electron bunches. The paper will give an overview on electron beam diagnostics at PITZ, including the above mentioned upgrades.  
 
MOPPP049 Deposition and In-Situ Characterization of Alkali Antimonide Photocathodes cathode, vacuum, synchrotron, scattering 670
 
  • X. Liang
    SBU, Stony Brook, New York, USA
  • K. Attenkofer
    ANL, Argonne, USA
  • I. Ben-Zvi, M. Ruiz-Osés
    Stony Brook University, Stony Brook, USA
  • H.A. Padmore, T. Vecchione
    LBNL, Berkeley, California, USA
  • S.G. Schubert
    HZB, Berlin, Germany
  • J. Smedley
    BNL, Upton, Long Island, New York, USA
  
  Funding: This work was supported by the Director, Office of Science, Office of Basic Energy Sciences of the U. S. Department of Energy, under Contract No. KC0407-ALSJNT-I0013, and DE-SC0005713.
Alkali antimonide cathodes have the potential to provide high quantum efficiency for visible light, and are significantly more tolerant of vacuum contaminants than GaAs, so they are attractive for high-average-current photoinjectors to generate high quality electron beams. These cathodes are crystalline; however, standard growth recipes used today do not produce large crystals. We have grown multi-alkali cathodes on silicon and molybdenum substrates with in-situ X-ray diffraction (XRD) and X-ray reflection (XRR) analysis. The correlation of the cathode structure to the growth parameters and quantum efficiency was explored. During the deposition and evaporation of Sb and K layers, the possibility of selective growth of specific crystalline orientation was observed via X-ray diffraction. 		 
 
MOPPP051 NSLS-II Transport Line Progress booster, linac, storage-ring, injection 676
 
  • R.P. Fliller, A.T. Anderson, B. Benish, W. DeBoer, G. Ganetis, R. Heese, H.-C. Hseuh, J. Hu, M.P. Johanson, B.N. Kosciuk, D. Padrazo, K. Roy, T.V. Shaftan, O. Singh, J.L. Tuozzolo, B. Wahl, G.M. Wang
    BNL, Upton, Long Island, New York, USA
  
  Funding: This manuscript has been authored by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The National Synchrotron Light Source II (NSLS-II) is a state-of-the-art 3-GeV third generation light source currently under construction at Brookhaven National Laboratory. The NSLS-II injection system consists of a 200 MeV linac, a 3-GeV booster synchrotron and associated transfer lines. The first part of the Linac to Booster Transport (LBT) line has been installed for linac commissioning. This part includes all components necessary to commission the NSLS-II linac. The second part of this transport line is undergoing installation. Initial results of hardware commissioning will be discussed. The Booster to Storage Ring (BSR) transport line underwent a design review. The first part of the BSR transport line, consisting of all components necessary to commission the booster will be installed in 2012 for booster commissioning. We report on the final design of the BSR line along with the plan to commission the booster. 		 
 
MOPPP069 First Measurements of COLDDIAG: A Cold Vacuum Chamber for Diagnostics solenoid, electron, vacuum, insertion 720
 
  • S. Gerstl, T. Baumbach, S. Casalbuoni, A.W. Grau, M. Hagelstein, T. Holubek, D. Saez de Jauregui
    Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
  • R. Bartolini, M.P. Cox, J.C. Schouten, R.P. Walker
    Diamond, Oxfordshire, United Kingdom
  • M. Migliorati, B. Spataro
    INFN/LNF, Frascati (Roma), Italy
  • I.R.R. Shinton
    UMAN, Manchester, United Kingdom
  
  Superconductive insertion devices can reach, for the same gap and period length, higher fields with respect to permanent magnet insertion devices. One of the still open issues for the development of superconductive insertion devices, is the understanding of the heat intake from the electron beam. COLDDIAG, a cold vacuum chamber for diagnostics was designed and built specifically for this purpose. With the equipped instrumentation, which covers temperature sensors, pressure gauges, mass spectrometers as well as retarding field analyzers it is possible to measure the beam heat load, total pressure, gas content as well as the flux of particles hitting the chamber walls. Here we report about the preliminary measurements and results of COLDDIAG installed in the Diamond storage ring.  
 
MOPPR003 Beam Diagnostic Systems for the TRIUMF e-linac linac, TRIUMF, EPICS, electron 777
 
  • J.M. Abernathy, D. Karlen, M.O. Pfleger, P.R. Poffenberger, D.W. Storey
    Victoria University, Victoria, B.C., Canada
  • F. Ames, P.S. Birney, D.P. Cameron, J.V. Holek, S.Y. Kajioka, S. Kellogg, M. Lenckowski, M. Minato, W.R. Rawnsley, J.E. Richards, V.A. Verzilov
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  
  Funding: NSERC, CFI, BCKDF.
The TRIUMF electron linac will include a suite of diagnostics systems, including current, beam position, and beam profile monitors. This talk will present an overview of the diagnostic systems and give details about the view screen system, having both scintillator and OTR foils. Results from tests with the prototype low energy beam transport system will be shown. Diagnostic systems are particularly challenging for the e-linac due to the 500 kW beam power envisaged, with beam currents up to 10 mA at 50 MeV. 		 
 
MOPPR010 Simultaneous Measurement of Emittance at the Storage Ring and the External Beamlines of ELSA emittance, quadrupole, synchrotron, extraction 792
 
  • S. Zander, F. Frommberger, W. Hillert, D. Proft
    ELSA, Bonn, Germany
  
  Funding: Funded by the DFG within the SFB / TR 16.
The Electron Stretcher Facility (ELSA) consists of several accelerator stages, the last one being a storage ring providing a beam of polarized electrons of up to 3.5 GeV. To ensure a high duty cycle, a slow extraction via a third integer resonance is applied at ELSA. The resonance extraction cause a variation of the emittance in the external beamline. A system for simultaneous measurement of emittance in the storage ring and the external beamlines has been installed. First results including a comparison of both emittances will be shown. 		 
 
MOPPR011 A New Diagnostic Beamline at ELSA synchrotron, radiation, synchrotron-radiation, electron 795
 
  • S. Zander, F. Frommberger, P. Hänisch, W. Hillert, B. Neff
    ELSA, Bonn, Germany
  
  Funding: Funded by the DFG within the SFB / TR 16.
At the Electron Stretcher Facility (ELSA), a new synchrotron light diagnostic Beamline has been installed in order to perform high resolution, transversal and longitudinal beam profile measurements by analyzing the emitted synchrotron light. For this purpose, the main deflecting AL mirror selects a wide range of wavelengths from 200–800 nm out of the whole synchrotron spectrum. The setup of the beamline and its relevant components will be presented. 		 
 
MOPPR016 Femtosecond Level Electron Bunch Diagnostic at Quasi – CW SRF Accelerators: Test Facility ELBE electron, SRF, laser, photon 810
 
  • M. Gensch, C. Kaya, U. Lehnert, P. Michel, Ch. Schneider, W. Seidel
    HZDR, Dresden, Germany
  • G. Geloni
    European XFEL GmbH, Hamburg, Germany
  • M. Helm
    FZD, Dresden, Germany
  • H. Schlarb, A. Shemmary, N. Stojanovic
    DESY, Hamburg, Germany
  
  Funding: BMBF through the PIDID proposal and HGF through the ARD initiative
At the srf based prototype cw accelerator ELBE a new electron beamline, providing for femtosecond electron bunches with nC bunch charges and repetition rates in the 1 – 200 KHz regime and with pC bunch charge and repetition rates of 13 MHz is currently constructed. The 40 MeV electrons will be used in photon-electron interaction experiments with TW and PW class laser and the generation of broad band and narrow bandwidth coherent THz pulses. In this paper we outline ideas for novel online diagnostics of the electron bunch properties (e.g. arrival time and bunch form) based on the time and frequency domain analysis of the emitted coherent THz radiation but also based on direct measurements by e.g. electro-optic sampling. The suitability of ELBE as a testbed for diagnostic of future cw X-ray photon sources (e.g. energy recovery linacs) will be discussed. 		 
 
MOPPR018 Beam Halo Monitor for FLASH and the European XFEL electron, free-electron-laser, laser, pick-up 816
 
  • A. Ignatenko, N. Baboi, O. Hensler, M. Schmitz, K. Wittenburg
    DESY, Hamburg, Germany
  • H.M. Henschel, W. Lange, W. Lohmann
    DESY Zeuthen, Zeuthen, Germany
  • A. Ignatenko
    BTU, Cottbus, Germany
  • S. Schuwalow
    Uni HH, Hamburg, Germany
  
  The Beam Halo Monitor for Free-electron Laser in Hamburg (FLASH) based on pCVD diamond and monocrystalline artificial sapphire sensors has been successfully commissioned in September 2009. It is a part of the beam dump diagnostics and ensures safe beam dumping. Its description and the experience gained during its operation are given. The ideas on the design and aspects of operation of the similar systems at FLASH II and the European XFEL are presented.  
 
MOPPR019 Beam Profile Imaging Based on Backward Transition Radiation in the Extreme Ultraviolet Region radiation, electron, target, FEL 819
 
  • L.G. Sukhikh, S. Bajt, G. Kube
    DESY, Hamburg, Germany
  • W. Lauth
    IKP, Mainz, Germany
  • Yu.A. Popov, A. Potylitsyn
    Tomsk Polytechnic University, Tomsk, Russia
  
  Backward transition radiation (BTR) in the optical spectral region is widely used for beam profile diagnostics in modern electron linacs. However, the experience from linac based light sources shows that BTR diagnostics might fail because of coherence effects in the emission process. To overcome this problem of coherent emission it was proposed to use BTR in the extreme ultraviolet (EUV) region*, and measurements of the angular EUV BTR distribution were presented in Ref. **. This contribution summarizes the results of a beam profile imaging experiment using EUV BTR. The experiment was carried out using the 855 MeV electron beam of the Mainz Microtron MAMI. EUV BTR was generated at a molybdenum target deposited onto a silicon substrate, and imaging was realized using a spherical multilayer mirror which was optimized for a wavelength of 19 nm. Preliminary results will be presented and compared to ordinary optical BTR imaging together with a discussion of future possibilities of the proposed diagnostic method.
* L.G. Sukhikh et al., Nucl. Instrum. Methods A623, 567 (2010).
** L.G. Sukhikh et al., Proc. of DIPAC-2011, Hamburg (Germany), 544 (2011).
 		 
 
MOPPR036 Correlation Analysis of Beam Diagnostic Measurements in SSRF status, lattice, feedback, background 858
 
  • Z.C. Chen, Y.B. Leng, Y.B. Yan
    SSRF, Shanghai, People's Republic of China
  • B.P. Wang
    SINAP, Shanghai, People's Republic of China
  
  Funding: Supported by National Natural Science Foundation of China (11075198)
Signals from various probes of the beam diagnostic system in Shanghai Synchrotron Radiation Facility (SSRF) were processed with correlation analysis algorithms. The resulting data allowed us to sort the probes by confidence, which means the stable and accurate signals could be separated from the faulty or noisy ones. And the beam dynamics measurements became electronic instrument free at the same time. This makes it possible to eliminate bad Beam Position Monitors (BPM) from the feedback system, offer a more confident set of beam parameters and estimate useful global information by extracting the relationship between some probes. 		 
 
MOPPR038 Bunch by Bunch Beam Diagnostics in SSRF damping, betatron, wakefield, injection 861
 
  • Y.B. Leng, J. Chen, Z.C. Chen, Y.B. Yan, N. Zhang
    SSRF, Shanghai, People's Republic of China
  • B.P. Wang
    SINAP, Shanghai, People's Republic of China
  
  A set of broadband beam instruments including filling pattern monitor, scope based BPM processor and streak camera has been implemented in the storage ring of SSRF. Several parameters such as charge, lifetime, transverse position, betatron tune and beam length, can be measured for individual bunch by these devices. The operation experience and measurement results will be introduced. The preliminary effort to retrieve wake field information from these measurements will be presented as well.  
 
MOPPR040 Design and Measurements of a Test Stand for the SEM-Grid System of the ESS-BILBAO electron, vacuum, emittance, linac 867
 
  • D. Belver, J. Feuchtwanger, P.J. González
    ESS Bilbao, LEIOA, Spain
  • F.J. Bermejo
    Bilbao, Faculty of Science and Technology, Bilbao, Spain
  • V. Etxebarria, J. Jugo
    University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain
  
  In the framework of the ESS-Bilbao accelerator, a test stand for the development of Secondary Electron EMission grid (SEM-Grid) has been designed and manufactured as a part of the diagnostics system for beam profile measurements. This test stand is a vacuum system based on an EQ 22/35 electron source from SPECS used as a beam injector. This electron source has an energy range from 0 to 5 KeV and a maximum beam current up to 200 μA. Although we have thought in a SEM-Grid of 40 wires (20 wires in each X and Y direction), two prototypes of 16 wires (8x8) of 250 μm diameter and spaced 1 and 2 mm, respectively, have been developed due to its easier implementation and tested in the test stand. In order to develop an electronics readout system for the SEM-Grid, first studies of the prototype signals have been done. The secondary emission current of each wire will be integrated and amplified to provide a significant voltage signal that can be measured by our acquisition system. A description of the SEM-Grid test stand and the measurements developed is given here.  
 
MOPPR041 Design and Measurements of the Stripline BPM System of the ESS-BILBAO controls, pick-up, EPICS, monitoring 870
 
  • D. Belver, J. Feuchtwanger, N. Garmendia, P.J. González, L. Muguira, S. Varnasseri
    ESS Bilbao, LEIOA, Spain
  • F.J. Bermejo
    Bilbao, Faculty of Science and Technology, Bilbao, Spain
  • V. Etxebarria, J. Jugo, J. Portilla
    University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain
  
  A new design for the Beam Position Monitors (BPMs) diagnostics of ESS-Bilbao, consisting of a whole block of stripline sensors, has been designed and manufactured. The design is based on travelling wave principles to detect the position of the beam in the vacuum chamber. The length of the stripline is 200 mm and the coverage angle is 0.952 rad. The position of the internal tube simulating the beam can be changed with respect to the outer tube within a range of 20 mm approximately for both X and Y axis, with a resolution less than 10 μm. The characteristics of the block with and without beam are measured and evaluated at frequencies of 175 and 352 MHz, using the electronics system developed for the BPM capacitive pick-ups. This electronics system is divided in an Analog Front-End (AFE) unit, where the signals are conditioned and converted to baseband, and a Digital Unit (DU) to sample them and calculate the position and phase of the beam. In this contribution, the performed tests will be fully described and the results also discussed.  
 
MOPPR045 Beam Diagnostics for ESS linac, target, DTL, instrumentation 882
 
  • A. Jansson, C. Böhme, B. Cheymol, H. Hassanzadegan, T.J. Shea, L. Tchelidze
    ESS, Lund, Sweden
  
  The European Spallation Source (ESS), to be built in the south of Sweden, will use a 2.5 GeV superconducting linac to produce the worlds most powerful neutron source. The project is currently in a pre-construction phase, during which the linac design is being updated. This paper describes the current plans for beam diagnostics in terms of requirements, number and locations of different systems, and possible technical solutions.  
 
MOPPR048 Beam Instrumentation for the HIE-ISOLDE Linac at CERN linac, cryomodule, emittance, ion 891
 
  • E. Bravin, A.G. Sosa, D. Voulot, F.J.C. Wenander, F. Zocca
    CERN, Geneva, Switzerland
  • M.A. Fraser
    UMAN, Manchester, United Kingdom
  • J.H. Galipienzo
    AVS, Eibar, Gipuzkoa, Spain
  • M. Pasini
    Instituut voor Kern- en Stralingsfysica, K. U. Leuven, Leuven, Belgium
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  
  In the framework of the High Intensity and Energy (HIE)-ISOLDE project at CERN, a beam instrumentation R&D program is on-going for the superconducting upgrade of the REX-ISOLDE heavy-ion post-accelerator. An overview of the foreseen beam diagnostics system is presented, focusing on the challenging specifications required by the HIE-ISOLDE linac. Due to the low beam intensities, the diagnostic instrumentation will be based on high-sensitivity intercepting devices. The project includes intensity and transverse profile monitors to be implemented in the very narrow longitudinal space that is available for beam diagnostics in the regions between the superconducting cryomodules. A longitudinal profile monitor is foreseen downstream of the linac to measure the beam energy and arrival time distributions and to allow for a fast phase-tuning of the superconducting cavities. A custom-made emittance meter will provide transverse emittance measurements based on a phase space sampling technique. The design status of the different instruments will be presented as well as the results of some experimental tests.  
 
MOPPR051 TLS Transportline BPM Upgrade injection, booster, EPICS, storage-ring 897
 
  • P.C. Chiu, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.H. Kuo, C.Y. Liao, C.Y. Wu
    NSRRC, Hsinchu, Taiwan
  
  There are seven stripline beam position monitor (BPM) installed in TLS booster to storage ring transport line. In order to provide the BPM system with better performance and functionalities, the latest generation BPM electronics Libera SinglePass had been adopted in TLS transport line for these stripline BPM. One unit had been tested in early 2011 and delivered the reliable and satisfactory results therefore extra six units had been purchased later. Currently, all of the new 7 units have replaced the past BPM electronics. The application had also been continuously developed. On the other hand, it is expected that the upgrade could enhance diagnostic functionalities for the related injection study. In this report, the injection stability and efficiency had been investigated.  
 
MOPPR055 A Two-dimensional Wire Scanner for a Low Energy Ion Beam ion, ion-source, acceleration, vacuum 909
 
  • C. Gabor
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  • G.E. Boorman
    Royal Holloway, University of London, Surrey, United Kingdom
  • A.P. Letchford
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  
  The Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL) is intended to demonstrate the early stages of acceleration for future high power proton applications. So far, the H− ion source and the low energy beam transport (LEBT) are operational. The commissioning of the LEBT is carried out with a multipurpose diagnostics vessel. On the other hand, the present status of the LEBT does not provide any permanent installed beam diagnostics beyond current measurement. Possible diagnostics need to be compact and rigid in a way that it can survive an area with potentially high beam losses and not suffering to much of beam noise. Furthermore, minimal invasive diagnostics is preferred. It is intended to present first results of a wire scanner where the geometry has been changed in a way that the two dimensional xy-space is accessible.  
 
MOPPR059 Modeling Space-charge and its Influence on the Measurement of Phase Space in ALICE by Tomographic Methods space-charge, quadrupole, injection, electron 918
 
  • M.G. Ibison, D.J. Holder
    The University of Liverpool, Liverpool, United Kingdom
  • K.M. Hock, B.D. Muratori, A. Wolski
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  
  Funding: STFC.
ALICE is an experimental electron accelerator designed to operate over a range of energies up to 35 MeV, and with up to 80 pC bunch charge. A dedicated tomography diagnostic section allows measurement of the transverse phase space with different beam parameters. In the low-energy, high-charge regime, space charge effects must be considered: to quantify these effects, the tracking code GPT has been used to simulate beams in the tomography diagnostic section. The results can be compared with simplified models, and with experimental measurements. 		 
 
MOPPR060 Calibration of the EMMA Beam Position Monitors: Position, Charge and Accuracy pick-up, injection, quadrupole, simulation 921
 
  • I.W. Kirkman
    The University of Liverpool, Liverpool, United Kingdom
  • J.S. Berg
    BNL, Upton, Long Island, New York, USA
  • G. Cox
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • A. Kalinin
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • D.J. Kelliher, S. Machida
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  
  The accurate determination of transverse beam position is essential to understanding the performance of an accelerator system, and this is particularly the case with non-scaling FFAG machines such as EMMA, where, due to fundamental principles of design, the beam may deviate widely from the central beampipe axis. This paper describes the various modelling approaches taken for the three different button pickup assemblies used in EMMA, and the subsequent methods of calibration (‘mappings’) which allow beam position and charge to be deduced from the processed BPM signals. The use and validity of the modelling and mapping approach adopted is described, and the contributions to positional and bunch charge uncertainty arising from these procedures is discussed.  
 
MOPPR068 Design and Development of the Diagnostic System for 75 MeV Electron Drive Beam for the AWA Upgrade controls, wakefield, emittance, cavity 942
 
  • J.G. Power, S.P. Antipov, M.E. Conde, W. Gai, C.-J. Jing, W. Liu, E.E. Wisniewski, Z.M. Yusof
    ANL, Argonne, USA
  
  Funding: Work supported by High Energy Physics, Office of Science, US DOE
We report on the development of the diagnostic system for the ongoing upgrade to the Argonne Wakefield Accelerator (AWA) facility where the electron drive beam energy will be increased from 15 to 75 MeV. The facility will produce a wide dynamic range of drive bunch train formats ranging from a single microbunch of 100 pC to bunch trains of up to 32 bunches spaced by 769 ps with up to 100 nC per bunch. In addition to standard diagnostics, this drive bunch train format poses two challenges for the diagnostic system: (i) the close spacing of the drive bunches, 769 ps, makes resolving the individual pulses difficult and (ii) the dynamic range of the bunch charge varies by x1000. A critical parameter of the drive bunch train for the wakefield accelerator is the charge along the train. To measure this, we are planning to use a 15 GHz digital oscilloscope to read either a BPM or Bergoz FCT. To handle the large dynamic range of charge, the imaging system will make use of GigE Vision cameras and a distributed system of motorized lenses, with remote control of focus, zoom, and aperture, which are operated through terminal servers and RS232 controllers. 		 
 
MOPPR070 Beam Profile Measurement in MTA Beam Line for High Pressure RF Cavity Beam Test cavity, proton, linac, electron 948
 
  • M.R. Jana, A.D. Bross, S. Geer, C. Johnstone, T. Kobilarcik, G.M. Koizumi, M.A. Leonova, A. Moretti, M. Popovic, T.A. Schwarz, A.V. Tollestrup, K. Yonehara
    Fermilab, Batavia, USA
  • M. Chung
    Handong Global University, Pohang, Republic of Korea
  • M.G. Collura
    Politecnico di Torino, Torino, Italy
  • B.T. Freemire, P.M. Hanlet, Y. Torun
    IIT, Chicago, Illinois, USA
  
  Funding: This work is supported by the United States Department of Energy under contract DE-AC02-07CH11359.
The recent High Pressure RF (HPRF) cavity experiment at the MuCool Test Area (MTA) used a 400 MeV Linac proton beam to study the beam loading effect. When the energetic proton beam passes through the cavity, it ionizes the inside gas and produces electrons. These electrons consume RF power inside the cavity. The number of electrons produced per cm inside the cavity (at 950 psi Hydrogen gas) per incident proton is 1200. The measurement of beam position and profile are necessary. The MTA is a flammable gas (Hydrogen) hazard zone, so we have developed a passive beam diagnostic instrument using a Chromox-6 scintillation screen and CCD camera. This paper presents quantitative information about beam position and beam profile. A neutral density filter was used to avoid saturation of the CCD camera. Image data is filtered and fitted with a Gaussian function to compute the beam size. The beam profile obtained from the scintillation screen will be compared with a multi-wire beam profile. 		 
 
MOPPR071 Initial Results of Transverse Beam Profile Measurements Using a LYSO:Ce Crystal radiation, electron, controls, laser 951
 
  • A.S. Johnson, A.H. Lumpkin, T.J. Maxwell, J. Ruan, J.K. Santucci, C.C. Tan, R.M. Thurman-Keup, M. Wendt
    Fermilab, Batavia, USA
  
  A prototype transverse beam profile monitor for eventual use at the Advanced Superconducting Test Accelerator (ASTA) has been tested at the Fermilab A0 Photoinjector. Results from low-charge (20 pC) studies indicate that a LYSO:Ce scintillator will be a viable replacement for a YAG:Ce scintillator when using intercepting radiation convertor screens for beam profiling. We will also describe the planned implementation of LYSO:Ce crystals to mitigate the coherent optical transition radiation due to the microbunching instability through the use of band-pass filters and specially timed cameras.  
 
MOPPR072 Fermilab PXIE Beam Diagnostics Development and Testing at the HINS Beam Facility laser, linac, emittance, rfq 954
 
  • V.E. Scarpine, B.M. Hanna, V.A. Lebedev, L.R. Prost, A.V. Shemyakin, J. Steimel, M. Wendt
    Fermilab, Batavia, USA
  
  Funding: This work was supported by the U.S. Department of Energy under contract No. DE-AC02-07CH11359.
Fermilab is planning the construction of a prototype front end of the Project X linac. The Project X Injector Experiment (PXIE) is expected to accelerate 1 mA cw H− beam up to 30 MeV. Some of the major goals of the project are to test a cw RFQ and H− source, a broadband bunch-by-bunch beam chopper and a low-energy superconducting linac. The successful characterization and operation of such an accelerator places stringent requirements on beam line diagnostics. These crucial beam measurements include bunch currents, beam orbit, beam phase, bunch length, transverse profile and emittance, beam halo and tails, as well as the extinction performance of the broadband chopper. This paper presents PXIE beam measurement requirements and instrumentation development plans. Also presented are plans to test many of these instruments at the Fermilab High Intensity Neutrino Source (HINS) beam facility. Since HINS is already an operational accelerator, utilizing HINS for instrumentation testing allows for quicker development of the required PXIE diagnostics. 		 
 
MOPPR075 Status of the APEX Beam Diagnostic and First Measurements laser, cathode, electron, gun 963
 
  • D. Filippetto, M.J. Chin, C.W. Cork, S. De Santis, L.R. Doolittle, W.E. Norum, C. F. Papadopoulos, G.J. Portmann, D.G. Quintas, F. Sannibale, R.P. Wells, M.S. Zolotorev
    LBNL, Berkeley, California, USA
  
  The APEX project aims to the construction of a high brightness high repetition rate photo-injector at LBNL. In its first phase a 750 keV electron bunch is produced at a maximum repetition rate of 1 MHz, with an adjustable charge per bunch spanning the pC-to-nC region. A load lock system is foreseen to test different cathodes without the need of breaking the vacuum and the downstream diagnostic is used to characterize the photo-emitted beam brightness. In the initial phase the main effort is directed toward the measurement of photocurrent, dark current, thermal emittance and electron beam kinetic energy. In a successive phase, diagnostic for full 6D phase space characterization of space charge dominated beams will be added to the beamline. We report and discuss the present diagnostic beamline layout, first beam measurements and future upgrades.  
 
MOPPR090 Progress Report on Development of a High Resolution Transverse Diagnostic based on Fiber Optics electron, radiation, photon, optics 996
 
  • R. Tikhoplav, R.B. Agustsson, G. Andonian, A.Y. Murokh, S. Wu
    RadiaBeam, Santa Monica, USA
  • R.K. Li, P. Musumeci, C.M. Scoby
    UCLA, Los Angeles, California, USA
  
  A beam profile monitor utilizing the technological advances in fiber optic manufacturing to obtain micron level resolution is under development at RadiaBeam Technologies. This fiber-optic profiling device would provide a low cost, turn-key solution with nominal operational supervision and requires minimal beamline real estate. Preliminary results of Cherenkov light generation in fiber is presented.  
 
TUEPPB009 First Measurements of the FACET Coherent Terahertz Radiation Source radiation, electron, photon, insertion 1134
 
  • Z. Wu, E. Adli, A.S. Fisher, M.J. Hogan, H. Loos
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by the U.S. Department of Energy under contract number DE-AC02-76SF00515.
The Facility for Accelerator science and Experimental Tests (FACET) at SLAC provides a high peak current, sub-ps bunched beam that is ideal for THz photon generation via coherent transition radiation. This paper presents preliminary characterization of the THz pulses generated by FACET electron beam. A one-micron thick Ti foil has been inserted into the beam path and the radiated photons collected. Michelson spectroscopy yields frequency content spanning from 0.25 THz to 2.3 THz and peaked at around 0.5 THz. Multiple scans at different bunch compression show a monotonic increase of the peak radiation frequency as the electron bunch gets shorter. Using the Kramers-Kronig relation, the temporal profile of the THz pulse is reconstructed from the power spectrum indicating a ~4 picosecond main pulse followed by a long oscillating tail due to the water absorption lines and detector response. Knife-edge scans measure a 4.4 mm x 4.8 mm transverse spot size at the focal point of the THz optical path. The total collected energy per pulse is 0.69 mJ measured by a Joulemeter. Fitting this total energy to the spatiotemporal profile of the THz pulse yields peak e-field amplitude of 1.5 MV/cm. 		 
 
TUPPC034 Preparation of SLS for IBS Measurements emittance, optics, impedance, radiation 1233
 
  • N. Milas, M. Böge, A. Streun
    PSI, Villigen, Switzerland
  • M. Aiba, A. Lüdeke, A. Saa Hernandez
    Paul Scherrer Institut, Villigen, Switzerland
  • F. Antoniou, Y. Papaphilippou
    CERN, Geneva, Switzerland
  
  It is planned to use the SLS for testing damping ring issues related to linear colliders. One aspect is the study of Intra-Beam Scattering (IBS) effects, which are a limiting factor for ultra-low emittance rings. In this paper we present the setup and characterization of a new mode of operation in which the SLS runs at lower energy (1.57 GeV) with a natural emittance of 2.4 nm rad. This is much smaller than that at the nominal energy (2.41 GeV) and should make IBS effects more easily visible. In order to be able to observe IBS a careful setup is required: Optics measurement and correction as well as measurements of the bunch natural energy spread and the onset of turbulent bunch lengthening. Also, a detailed discussion on the available diagnostics and their limitations are shown and finally some preliminary results of beam emittance measurements, in all three planes, as a function of single bunch current are presented.  
 
TUPPC052 Longitudinal Beam Tuning at FACET linac, wakefield, simulation, klystron 1287
 
  • N. Lipkowitz, F.-J. Decker, J. Sheppard, S.P. Weathersby, U. Wienands, M. Woodley, G. Yocky
    SLAC, Menlo Park, California, USA
  
  Commissioning of the Facility for Advanced acCelerator Experimental Tests (FACET) at SLAC began in July 2011. In order to achieve the high charge density required for users such as the plasma wakefield acceleration experiment, the electron bunch must be compressed longitudinally from ~6 mm down to 20 microns. This compression scheme is carried out in three stages and requires careful tuning, as the final achievable bunch length is highly sensitive to errors in each consecutive stage. In this paper, we give an overview of the longitudinal dynamics at FACET, including beam measurements taken during commissioning, tuning techniques developed to minimize the bunch length, optimization of the new “W” chicane at the end of the linac, and comparison with particle tracking simulations. In addition, we present additional diagnostics and improved tuning techniques, and their expected effect on performance for the upcoming 2012 user run.  
 
TUPPP066 CLARA - A Proposed New FEL Test Facility for the UK FEL, electron, laser, undulator 1750
 
  • J.A. Clarke, D. Angal-Kalinin, D.J. Dunning, S.P. Jamison, J.K. Jones, J.W. McKenzie, B.L. Militsyn, N. Thompson, P.H. Williams
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • R. Bartolini
    JAI, Oxford, United Kingdom
  • I.P.S. Martin
    Diamond, Oxfordshire, United Kingdom
  
  A new single pass national FEL test facility, CLARA, is proposed to be constructed at Daresbury Laboratory in the UK. The aim of CLARA is to develop a normal conducting test accelerator able to generate longitudinally and transversely bright electron bunches and to use these bunches in the experimental production of stable, synchronized, ultra short photon pulses of coherent light from a single pass FEL with techniques directly applicable to the future generation of light source facilities. In addition the facility will be an ideal test bed for demonstrating innovative technologies such as high repetition rate normal conducting RF linacs and advanced undulator designs. This paper will describe the design of CLARA, pointing out the flexible features that will be incorporated to allow multiple novel FEL schemes to be proven.  
 
TUPPR070 High-Gradient Photonic Band-gap (PBG) Structure Breakdown Testing at Ku-Band lattice, HOM, damping, coupling 1984
 
  • B.J. Munroe, A.M. Cook, M.A. Shapiro, R.J. Temkin
    MIT/PSFC, Cambridge, Massachusetts, USA
  
  Photonic Band-gap (PBG) structures continue to be a promising area of research forfuture accelerator structures. Previous experiments at X-Band have demonstrated that PBG structures can operate at high gradient and low breakdown probability, provided that pulsed heating is controlled. Two single-cell standing-wave structures have been constructed at MIT to investigate breakdown performance of PBG structures. A metallic structure with small rods will be used to test performance with very high surface temperature rise, while an over-moded structure with dielectric rods will investigate alternative solutions to the issue of surface temperature rise. Both structures are expected to reach gradients of at least 100 MV/m and will utilize novel diagnostics, including fast camera imaging and optical spectroscopy of breakdowns.  
 
WEXB02 Diagnostics for High Power Targets and Dumps target, proton, radiation, vacuum 2096
 
  • E. Gschwendtner
    CERN, Geneva, Switzerland
  
  High power targets and dumps are generally used for neutrino, antiproton, neutron and secondary beam production, or in waste management using intense beams. In order to guarantee an optimized and safe use of these targets and dumps, reliable instrumentation is needed; the diagnostics in high power beams around targets and dumps is reviewed. The suite of beam diagnostic devices used in such extreme environments is discussed, including their role in commissioning and operation. The handling and maintenance of the instrumentation components in high radiation areas will be addressed.  
slides icon Slides WEXB02 [13.010 MB]  
 
WEOAA02 Inorganic Scintillators for Particle Beam Profile Diagnostics of Highly Brilliant and Highly Energetic Electron Beams electron, radiation, simulation, monitoring 2119
 
  • G. Kube, C. Behrens, C. Gerth, B. Schmidt
    DESY, Hamburg, Germany
  • W. Lauth
    IKP, Mainz, Germany
  • M. Yan
    Uni HH, Hamburg, Germany
  
  Transverse beam profile diagnostics in electron linacs are widely based on optical transition radiation (OTR) as standard technique. The experience from modern linac based light sources shows that OTR diagnostics might fail because of coherence effects in the OTR emission process. As consequence, for the new 4th generation light sources as the European X-FEL, new reliable tools for transverse beam profile measurements are required. Scintillating screens are widely used for particle beam diagnostics, especially in transverse profile measurements at hadron machines and low energy electron machines where the intensity of OTR is rather low. Their usage may serve as an alternative way to overcome limitations in OTR based beam diagnostics imposed by the influence of coherent emission. However, there is only little information about scintillator properties for applications with high energetic electrons. Therefore, test experiments have been performed at the Mainz Microtron (MAMI) in order to study the screen applicability. The status of these experiments will be presented and the results will be discussed in view of scintillator material properties and observation geometry.  
slides icon Slides WEOAA02 [1.648 MB]  
 
WEPPC009 Status of the European XFEL 3.9 GHz system cavity, status, linac, HOM 2224
 
  • P. Pierini, A. Bosotti, P. Michelato, L. Monaco, R. Paparella, D. Sertore
    INFN/LASA, Segrate (MI), Italy
  • E.R. Harms
    Fermilab, Batavia, USA
  • C. Pagani
    Università degli Studi di Milano & INFN, Segrate, Italy
  • E. Vogel
    DESY, Hamburg, Germany
  
  The injector of the European XFEL will use a third harmonic RF system at 3.9 GHz to flatten the RF curvature after the first accelerating module before the first bunch compression stage. This paper presents qualification tests of the prototype cavities and the status of the activities for the realization of the third harmonic section of the European XFEL towards its commissioning due in 2014.  
 
WEPPC034 LA³NET - An International Network on Laser Applications at Accelerators laser, ion, acceleration, electron 2281
 
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  
  Funding: This project is funded by the European Union under contract PITN-GA-2011-289191.
Lasers have become increasingly important for the successful operation and continuous optimization of particle accelerators: Laser-based particle sources are well suited for delivering the highest quality ion and electron beams, laser acceleration has demonstrated unprecedented accelerating gradients and might be an alternative for conventional particle accelerators in the future, and without laser-based beam diagnostics it would not be possible to unravel the characteristics of many complex particle beams. The LA³NET project will bring together research centers, universities, and industry partners to jointly train 17 early stage researchers. In addition, the consortium will also organize a number of international training events, such as schools, topical workshops and conferences. This contribution gives examples from the network's broad research program and summarizes planned training events. 		 
 
WEPPC104 Tomography as a Diagnostic Tool for Plasma Etching of SRF Cavities plasma, SRF, cavity, niobium 2459
 
  • M. Nikolić, A.L. Godunov, S. Popović, A. Samolov, L. Vušković
    ODU, Norfolk, Virginia, USA
  • F. Čučkov
    Old Dominion University, Norfolk, USA
  
  Plasma based surface modification is a promising alternative for etching of superconductive radio frequency (SRF) cavities. A plasma processed SRF cavity presents a plasma reactor with limited or distorted symmetry. We are developing a tomographic reconstruction of local plasma parameters, as a diagnostic tool in the plasma etching setting of SRF cavities. The method is non-invasive and provides deep insight into the fundamental processes and phenomena during the plasma treatment of SRF cavities’ surfaces. Here we report on our progress in developing tomographic numerical method, based on 2D inverse Radon formula. We tested it on supersonic flowing microwave discharge maintained in the cylindrical quartz tube. Due to the model’s sensitivity to the noise signal in the experiment, an automated measurement system has been built with the aim to increase the overall precision of data acquisition as well as to stream line the measurement process.  
 
WEPPD044 Machine Protection System for the SPIRAL2 Facility controls, beam-losses, target, ion 2612
 
  • M.H. Moscatello, C. Berthe, C. Jamet, G. Normand
    GANIL, Caen, France
  
  The phase 1 of the SPIRAL2 facility, extension project of the GANIL laboratory, is under construction. The accelerator is based on a linear solution, mainly composed of a normal conducting RFQ and a superconducting linac. One of its specificities is to be designed to accelerate high power deuteron and heavy ion beams (40-200kW), and medium intensity heavy ion beams as well (a few kW). The associated Machine Protection System, has thus to be able to control and protect the accelerator for a very large range in terms of beam intensities and beam powers. This paper presents the technical solutions chosen for this system and the present status of its construction.  
 
WEPPD051 Timing System for the PEFP 100-MeV Proton LINAC and Multipurpose Beamlines proton, linac, EPICS, controls 2633
 
  • Y.-G. Song, Y.-S. Cho, J.-H. Jang, H.-J. Kwon, K.T. Seol
    KAERI, Daejon, Republic of Korea
  
  Funding: This work is supported by the 21C frontier R&D program in the ministry of science and technology of the Korean government.
The PEFP 100-MeV Linac requires precision synchronization of timing trigger signals for various accelerator and diagnostic components. A timing event system is selected as the main timing system, which is operated based on an event distribution system and can be constructed with COTS hardware. This system broadcasts the precise timing information globally. This paper describes the architecture, construction and performance of the PEFP timing event system. 		 
 
WEPPP015 Generation and Characterization of 5-micron Electron Beam for Probing Optical Scale Structures electron, quadrupole, permanent-magnet, target 2753
 
  • M.G. Fedurin, M. Babzien, V. Yakimenko
    BNL, Upton, Long Island, New York, USA
  • B.A. Allen
    USC, Los Angeles, California, USA
  • P. Muggli
    MPI, Muenchen, Germany
  • A.Y. Murokh
    RadiaBeam, Santa Monica, USA
  
  In recent years advanced acceleration technologies have progress toward combination of electron beam, laser and optical scale dielectric structures. In present paper described generation of the electron beam probe with parameters satisfied to perform test of such optical structures.  
 
WEPPP072 Beam Characterization and Coherent Optical Transition Radiation Studies at the Advanced Photon Source Linac emittance, linac, laser, radiation 2876
 
  • J.C. Dooling, R.R. Lindberg, N. Sereno, C.-X. Wang
    ANL, Argonne, USA
  • A.H. Lumpkin
    Fermilab, Batavia, USA
  
  Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract number DE-AC02-06CH11357.
The Advanced Photon Source facility includes a 450-MeV S-band linac with the option for injection from a photocathode (PC) rf gun. A diode-pumped, twice-frequency doubled Nd:glass regen laser (263 nm) is used with the Cu PC to generate the electron beams. Characterization of these beams and studies of the microbunching instability following beam compression in the four-dipole magnetic chicane are described. A suite of diagnostics is employed including a three-screen emittance section, a FIR coherent transition radiation autocorrelator, electron spectrometers, and an optical diagnostics end station. An energy chirp impressed on the beam is used to compress the 1-2 ps, rms bunch as it passes through the chicane. With compression, bunch lengths of 170-200 fs, rms at 450 pC are measured, and coherent optical transition radiation (COTR) due to the microbunching instability is observed. Mitigation techniques of the COTR in the beam profile diagnostics are demonstrated both spectrally and temporally. At 100 pC without compression normalized transverse emittances of 1.8 and 2.7 microns are observed in the x and y planes, in reasonable agreement with initial ASTRA simulations. 		 
 
WEPPR014 Recovering Measured Dynamics from a DC Circulating Space-Charge-Dominated Storage Ring electron, background, space-charge, storage-ring 2967
 
  • W.D. Stem, B.L. Beaudoin, I. Haber, T.W. Koeth
    UMD, College Park, Maryland, USA
  
  Funding: This work is supported by the US Dept. of Energy Offices of High Energy Physics and Fusion Energy Sciences, and by the US Dept. of Defense Office of Naval Research and Joint Technology Office.
Space-charge is increasingly significant at high beam intensities such as in FEL injectors and heavy ion inertial fusion drivers, where it dominates the beam dynamics. The University of Maryland Electron Ring (UMER) is a high intensity circular machine that is dedicated to the study of long path length space-charge-dominated beam physics on a small scale. Over multiple turns, longitudinal space charge effects cause the tail and head of an electron bunch to expand and interpenetrate, eventually resulting in a “DC beam”. This leads to complications when trying to measure the beam with UMER’s AC coupled diagnostics. Three techniques are developed to recover the information within the beam. Two “knockout” techniques implement invasive pulsed electric kicks to the beam in combination with either a fluorescent imaging screen or a current monitor. A third technique based on integration of the wall-current signal provides a non-invasive method to study the DC beam dynamics. Experimental results from all three methods are compared. The DC beam profile can then be studied over long trajectories and the existence of any loss mechanisms can be determined. 		 
 
WEPPR034 Longitudinal Phase Space Measurement for the Advanced Superconducting Test Accelerator Photoinjector emittance, simulation, cavity, collimation 3009
 
  • C.R. Prokop, P. Piot
    Northern Illinois University, DeKalb, Illinois, USA
  • M.D. Church, Y.-E. Sun
    Fermilab, Batavia, USA
  
  Funding: LANL LDRD program, project 20110067DR -U.S. DOE Contract No. DE-FG02-08ER41532 and DE-AC02-07CH11359.
The Advanced Superconducting Test Accelerator (ASTA) at Fermilab uses a high-brightness photoinjector capable of producing electron bunches with charges up to 3.2 nC, to be used in support of a variety of advanced accelerator R&D experiments. The photoinjector incorporates an extensive diagnostics suites including a single-shot longitudinal-phase-space diagnostics composed of a horizontally deflecting cavity followed by a vertical spectrometer. In this paper, we present the design, optimization, and performance analysis (including detrimental collective effects) of the longitudinal phase space diagnostics and especially compare two possible choices of deflecting cavity frequencies. 		 
 
THPPC031 Commissioning of a 1.3-GHz Deflecting Cavity for Phase-Space Exchange at the Argonne Wakefield Accelerator cavity, wakefield, klystron, simulation 3350
 
  • P. Piot
    Fermilab, Batavia, USA
  • M.E. Conde, W. Gai, C.-J. Jing, R. Konecny, W. Liu, J.G. Power, Z.M. Yusof
    ANL, Argonne, USA
  • D. Mihalcea, M.M. Rihaoui
    Northern Illinois University, DeKalb, Illinois, USA
  
  Funding: Work supported by DOE awards FG-02-08ER41532 and DE-AC02-06CH11357.
A 1/2-1-1/2 cell normal-conducting 1.3-GHz deflecting cavity was recently installed at the Argonne Wakefield Accelerator. The cavity will soon be included in a transverse-to-longitudinal phase space exchanger that will eventually be used to shaped the current profile of AWA electron bunches in support of dielectric wakefield experimentS with enhanced transformer ratio. In this paper we report on the initial commissioning of the deflecting cavity including rf-conditioning and beam-based measurement of the deflecting strength. 		 
 
THPPP050 HIE-ISOLDE SC Linac: Operational Aspects and Commissioning Preparation linac, emittance, cryomodule, ion 3853
 
  • D. Voulot, E. Bravin, M.A. Fraser, B. Goddard, Y. Kadi, D. Lanaia, A.S. Parfenova, M. Pasini, A.G. Sosa, F. Zocca
    CERN, Geneva, Switzerland
  
  In the framework of the HIE-ISOLDE project, the REX linac will be upgraded in stages to 5.5 MeV/u and 10 MeV/u using superconducting (SC) quarter-wave cavities. The linac lattice is now frozen and the beam dynamics has been checked. The beam properties at the output of the NC linac for the different stages have been measured and are compatible with the SC linac acceptance. The high-energy beam transfer design is being finalised and a study has been launched for a buncher/chopper system allowing 100 ns bunch spacing for time-of-flight measurements. A compact diagnostic box for the inter-cryomodule region is under development and a new Si-detector based monitor for energy and phase measurements has been tested.  
 
THPPP086 UFOs in the LHC: Observations, Studies and Extrapolations simulation, beam-losses, proton, quadrupole 3936
 
  • T. Baer, M.J. Barnes, F. Cerutti, A. Ferrari, N. Garrel, B. Goddard, E.B. Holzer, S. Jackson, A. Lechner, V. Mertens, M. Misiowiec, E. Nebot Del Busto, A. Nordt, J.A. Uythoven, V. Vlachoudis, J. Wenninger, C. Zamantzas, F. Zimmermann
    CERN, Geneva, Switzerland
  • T. Baer
    University of Hamburg, Hamburg, Germany
  • N. Fuster Martinez
    Valencia University, Atomic Molecular and Nuclear Physics Department, Valencia, Spain
  
  Unidentified falling objects (UFOs) are potentially a major luminosity limitation for nominal LHC operation. They are presumably micrometer sized dust particles which lead to fast beam losses when they interact with the beam. With large-scale increases and optimizations of the beam loss monitor (BLM) thresholds, their impact on LHC availability was mitigated from mid 2011 onwards. For higher beam energy and lower magnet quench limits, the problem is expected to be considerably worse, though. In 2011/12, the diagnostics for UFO events were significantly improved: dedicated experiments and measurements in the LHC and in the laboratory were made and complemented by FLUKA simulations and theoretical studies. The state of knowledge, extrapolations for nominal LHC operation and mitigation strategies are presented.  
 
THPPP096 Recent Developments and Applications of the Beam Simulation Code Warp plasma, simulation, ion, heavy-ion 3957
 
  • J.-L. Vay, P.A. Seidl
    LBNL, Berkeley, California, USA
  • A. Friedman, D.P. Grote
    LLNL, Livermore, California, USA
  
  Funding: Supported by US-DOE Contracts DE-AC02-05CH11231 and DE-AC52-07NA27344. Used resources of NERSC, supported by US-DOE Contract DE-AC02-05CH11231.
The Particle-In-Cell Framework Warp is being developed by the Heavy Ion Fusion US program to guide the development of accelerators for high energy density experiments and ultimately for inertial fusion energy. Accurate predictions of the beam phase space are important for understanding the limits to the pulse compression, in particular for NDCX-II now under construction at LBNL. We will present a new numerical method that correct for the effects of linear correlations, offering accurate mapping of energy spread and temperature. The interaction of the beam with the neutralizing plasma can affect non linearly the phase space of the beam. We will present fully kinetic simulation of the beam/plasma interaction aimed toward a better understanding of these effects and possibilities for mitigating or exploiting them. We will also present an application of the original warped coordinate algorithm to the modeling of charge separation in the transition of a 50 MeV singly charged Uranium beam to higher charge state upon passing through a stripping foil, with the goal of decreasing the cost of a Heavy Ion Fusion driver. We also describe studies of beams in plasmas and of injector optimization.
Used resources of NERSC. 		 
 
THPPP097 Diagnostic Pulse for Single-particle-like Beam Position Measurements During Accumulation/Production Mode in the Los Alamos Proton Storage Ring injection, linac, betatron, LLRF 3960
 
  • J.S. Kolski, S.A. Baily, E. Björklund, G.O. Bolme, M.J. Hall, S. Kwon, M.P. Martinez, M.S. Prokop, F.E. Shelley, P.A. Torrez
    LANL, Los Alamos, New Mexico, USA
  
  Beam position monitors (BPMs) are the primary diagnostic in the Los Alamos Proton Storage Ring (PSR). Injecting one turn, the transverse motion is approximated as a single particle with initial betatron position and angle (x0 and x0'). With single-turn injection, we fit the betatron tune, closed orbit (CO), and injection offset (x0 and x0' at the injection point) to the turn-by-turn beam position. In production mode, we accumulate multiple turns, the transverse phase space fills after 5 injections (horizontal and vertical fractional betatron tunes ~0.2) resulting in no coherent betatron motion, and only the CO may be measured. The injection offset, which determines the accumulated beam size and is very sensitive to steering upstream of the ring, is not measurable in production mode. We describe our approach and ongoing efforts to measure the injection offset during production mode by injecting a ‘‘diagnostic'' pulse ~50 us after the accumulated beam is extracted. We also study the effects of increasing the linac RF gate length to accommodate the diagnostic pulse on the production beam position, transverse size, and loss.  
 
THPPR003 Progresses on !CHAOS Development controls, LabView, status, ion 3969
 
  • L.G. Foggetta, C. Bisegni, S. Calabrò, P. Ciuffetti, G. Di Pirro, G. Mazzitelli, A. Stecchi
    INFN/LNF, Frascati (Roma), Italy
  • L. Catani, D. Di Giovenale, F. Zani
    INFN-Roma II, Roma, Italy
  
  !CHAOS(Control System based on Highly Abstracted and Open Structure), the new control system architecture proposed by INFN is in development and some parts of it are now under test on the DAØNE and SPARC complexes. Although the main goal of the !CHAOS project remains the accelerator-based research facility proposed for the Cabibbo Lab and the SuperB accelerator, other applications are under study in order to adapt this new design to the needs coming from different fields, with a growing interest from many companies. Recent developments, tests results, potential applications and future project's plans are presented.  
 
THPPR008 Wireless Network Integration Into EPICS Systems EPICS, controls, LabView, monitoring 3978
 
  • I. Badillo, M. Eguiraun, D. Piso
    ESS-Bilbao, Zamudio, Spain
  • J. Jugo
    University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain
  
  Funding: ESS Bilbao Consortium
Wired connections are very often irreplaceable in large scientific facilities due to performance and reliability issues. However, those communication links suffer from several disadvantages, such as lack of flexibility during deployment or reconfiguration and deterioration of wires and physical connectors. The goal of the present work is to introduce wireless EPICS sub-networks in a standard general wired EPICS system. This involves the study and selection of a proper wireless technology, architecture, communication strategy and security policy. To ensure the validity of the proposed approach, a thorough study of the results related parameters, such as throughput, security, repeatability and stability of the overall system is needed. Once those are considered, the next step is to decide where and when the replacement of physical connections with Wireless communication systems is suitable. The aim is to eliminate as many wires as possible without decreasing the reliability, security and performance of the current EPICS control network. 		 
 
THPPR046 Status of the MedAustron Ion Beam Therapy Centre controls, ion, synchrotron, ion-source 4077
 
  • U. Dorda
    CERN, Geneva, Switzerland
  • M. Benedikt, A. Fabich, F. Osmic
    EBG MedAustron, Wr. Neustadt, Austria
  
  MedAustron is a synchrotron based light-ion beam therapy centre for cancer treatment as well as for clinical and non-clinical research currently in its construction phase. The accelerator design is based on the CERN-PIMMS study and its technical implementation by CNAO. This paper presents a status overview over the whole project detailing the achieved progress of the building construction & technical infrastructure installation in Wiener Neustadt, Austria, as well as of the accelerator development, performed at CERN and partially at PSI. The design and procurement status and future planning of the various accelerator components is elaborated.  
 
THPPR055 Compact Gantry with Large Momentum Acceptance kicker, proton, octupole, sextupole 4100
 
  • W. Wan, D. Robin, A. Sessler, C. Sun
    LBNL, Berkeley, California, USA
  
  Rotatable Ion Beam Cancer Therapy (IBCT) delivery systems or gantries are the largest features in an ion beam therapy facility. They weight 100+ tons and require large (~3 story) heavily shielded rooms to house them. Reducing the size of ion beam gantries using high field One disadvantage of superconducting magnets is the difficulty of changing the fields quickly in order to adjust the beam momentum to scan the depth of penetration. In this paper we present a design of a gantry consisting of many combined function superconducting magnets that have a large enough momentum acceptance (> pm 10%) such that the magnets do not need to be changed while changing the beam energy.  
 
FRXCB01 Review of Microwave Schottky Beam Diagnostics pick-up, proton, antiproton, ion 4175
 
  • R.J. Pasquinelli
    Fermilab, Batavia, USA
  
  Non-intercepting beam diagnostics for detection of the incoherent motion of the finite number of beam particles, i.e. Schottky beam monitors, have been proven as extremely useful to characterize tune, chromaticity, and momentum spread in circular accelerators and colliders. This beam instrument, based on advanced microwave techniques, operates successfully in Recycler and Tevatron, and was recently implemented in the Large Hadron Collider. This presentation should review the technology of Schottky beam diagnostics systems with an emphasis on initial deployment at the Tevatron, concluding with the latest measurement results from the LHC and an outlook of possible improvements and extensions of the diagnostics.  
slides icon Slides FRXCB01 [22.518 MB]