09 Others
Paper Title Page
MOOA03
 Photon Diagnostics for X-ray FELs  
 
  • M. Gensch
    HZDR, Dresden, Germany
  
  Funding: German Ministry of Education (BMBF through grant no. 05K10KEB)
SASE FELs have now truly evolved into the long anticipated so called 4th generation of accelerator based X-ray light sources. A number of piloting experiments are proof that these novel X-ray sources provide radiation with the theoretically predicted unprecedented properties such as femtosecond pulse duration or Gigawatt peak power in a photon energy range extending from the soft X-ray into the hard X-ray regime. However, the success of these facilities depends strongly on the availability of suitable photon diagnostics. To be precise, due to the stochastic nature of the SASE process, properties such as pulse energy, wavelength, pulse duration and arrival time are varying from pulse to pulse and more complex experiments will crucially depend on the determination of these properties for every individual X-ray pulse. In this talk, the state of the art of currently available photon diagnostic is discussed and novel single shot techniques for the measurement of X-ray pulse duration [1] and arrival time [2] are presented.
[1] U.Fruhling, M.Wieland, M.Gensch et. al., Nature Photon. (2009)
[2] F.Tavella, N.Stojanovic, G.A.Geloni and M.Gensch, Few-femtosecond timing at fourth-generation X-ray light sources, accepted.
 
slides icon Slides MOOA03 [24.175 MB]  
 
MOPD82 Installation for Measurements of Secondary Emission Yield and Electron Cloud Lifetime in Magnetic Field 236
 
  • A.A. Krasnov, V.V. Anashin, V.K. Ovchar, V.V. Smaluk, D.P. Sukhanov
    BINP SB RAS, Novosibirsk, Russia
  
  An experimental setup for investigations of electron-surface interaction and electron cloud behavior is under commissioning at BINP. The proposed method provides direct measurements of secondary emission yield and electron clouds lifetime in the presence of strong magnetic field. In principle, the experiments can be performed at cryogenic temperatures. The experimental data will help to figure out the process of reflection of low energy electrons from a metal surface and can be useful for improvement of computer codes developed for simulation of electron clouds behavior in a cold beam pipe of particle accelerators. The structure and performance capabilities of the setup are described, first experimental results are presented.  
 
MOPD84 Hollow Photocathode Prototype for e-Gun 242
 
  • M.A. Nozdrin, N. Balalykin, A.A. Feshchenko, V. Minashkin, G. Shirkov, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
  • S. Gazi, J. Huran
    Slovak Academy of Sciences, Institute of Electrical Engineering, Bratislava, Slovak Republic
  
  Photocathodes are important devices for contemporary electron accelerators. Significant photocathode parameters are: fast response time, quantum efficiency, long lifetime, low emittance and minimal effect on RF properties of the accelerating system. In this paper development of the hollow photocathode conception is presented and prototype is described. Such cathode geometry allows quantum efficiency rising due to surface photoelectric effect which is concerned with normal to material surface wave electric field multiplier. Experimental results of hollow photocathode using efficiency are given (266nm wavelength, 15 ns pulse time with 1 Hz repetition rate). Backside irradiation radically simplifies laser beam targeting on emitting surface, accelerator equipment adjustment and allows photocathode working surface laser cleaning.  
poster icon Poster MOPD84 [1.505 MB]  
 
MOPD86 Development of FESA-based Data Acquisition and Control for FAIR 248
 
  • R. Haseitl, H. Bräuning, T. Hoffmann, K. Lang, R. Singh
    GSI, Darmstadt, Germany
  
  GSI has selected the CERN Front End Software Architecture (FESA) to operate future beam diagnostic devices for the upcoming FAIR facility. The FESA framework is installed and operational at the GSI site, giving equipment specialists the possibility to develop FESA classes for device control and data acquisition. This contribution outlines first developments of FESA-based systems for various applications. Prototype DAQ systems based on FESA are the BPM system of the synchrotron SIS18 with data rates up to 7 GBit/s and a large scaler setup for particle counters called LASSIE. FESA classes that address gigabit Ethernet cameras are used for video imaging tasks like scintillator screen observation. Control oriented FESA classes access industrial Programmable Logic Controllers (PLCs) for the slow control of beam diagnostic devices. To monitor temperatures and set fan speeds of VME crates, a class communicating over the CAN bus has been developed.  
poster icon Poster MOPD86 [3.137 MB]  
 
MOPD87 The LHC Beam Presence Flag System 251
 
  • M. Gasior, T.B. Bogey
    CERN, Geneva, Switzerland
  
  Before injecting any high intensity bunches into the LHC a circulating low intensity pilot bunch must be present to confirm the correct settings of the main machine parameters. For the 2010 LHC run the detection of this pilot beam was done with the beam current transformer system. To increase redundancy of this important safety function a dedicated beam presence flag system was designed, built and tested with beam to be used operationally in the 2011 run. In this system signals from four electrodes of a beam position monitor (BPM) are processed with separate channels, resulting in a quadruple system redundancy for either beam. Each system channel consists of an analogue front-end converting the BPM signals into two logic states, which are then transmitted optically to the machine protection and interlock systems. For safety reasons the system does not have any remote control or adjustable elements and its only inputs are the beam signals. This paper describes the new LHC beam presence flag system, in particular the analogue front-end based on diode peak detectors.  
poster icon Poster MOPD87 [8.200 MB]  
 
MOPD88 Electron Beam Ion Sources, Ion Optical Elements and Beam Diagnostics for Particle Accelerators 254
 
  • F. Ullmann, V.P. Ovsyannikov, M. Schmidt
    DREEBIT GmbH, Dresden, Germany
  • G. Zschornack
    Technische Universität Dresden, Institut für Angewandte Physik, Dresden, Germany
  
  Electron Beam Ion Sources (EBISs) provide highly charged ions (HCIs) for a variety of investigations and applications, amongst others as injection source for particle accelerators. EBISs feature a lot of advantages which qualify them for accelerator injection, and which partly compensate their comparatively low number of particles. DREEBIT GmbH provides a family of compact EBISs based on permanent magnets. A more sophisticated version is based on cryogen-free superconducting magnets providing a higher ion output. Its compact design makes them transportable, low in operational costs, and guarantee easy handling. We present latest improvements and measurements proving the feasibility of producing beams of HCIs with convenient beam properties such as low transversal and longitudinal emittance. In addition we present a variety of ion optical elements and ion beam diagnostics. The DREEBIT Wien filter allows for the charge mass separation. The DREEBIT Pepper-pot Emittance Meter allows for emittance measurements of beams of a wide range of particle intensity. Other beam diagnostics are provided, such as Beam Imaging System, Retarding Field Analyzer and different kinds of Faraday cups.  
 
MOPD90 Cause Identification of Beam Losses in PETRA III by Time Correlation of Alarms 257
 
  • T. Lensch, M. Werner
    DESY, Hamburg, Germany
  
  PETRA III is a high brilliant synchrotron light-source operating at 6 GeV at the DESY site in Hamburg. The Machine Protection System (MPS) of PETRA III is under operation since the beginning of the commissioning of PETRA III in April 2009. Under certain alarm conditions the MPS generates a dump command and protects the machine against damage. As a functional extension the MPS hardware examines the time correlation of alarm sequences after a beam loss. The alarm sequences are evaluated in a software based system so that the cause of a beam loss can be displayed in the control room immediately. This paper describes the hardware implementation as well as the software rules.  
poster icon Poster MOPD90 [0.548 MB]  
 
MOPD91 Pulse-By-Pulse X-ray Beam Monitor Equipped with Microstripline Structure 260
 
  • H. Aoyagi, S. Takahashi
    JASRI/SPring-8, Hyogo-ken, Japan
  • H. Kitamura
    RIKEN/SPring-8, Hyogo, Japan
  
  Pulse-by-pulse measurement of X-ray beam is import issue for the 3rd generation light sources in order not only to stabilize X-ray beam in an experimental hutch but also to diagnose electron beam in a storage ring. A new pulse-by-pulse X-ray beam monitor equipped with microstripline structure has been developed. The detector head has the microstripline structure. The impedance of the detector head is matched to 50 ohm. Thermodynamics of the detector head is also well considered against severe heat load. The advantage of this monitor is that output signal is short and unipolar pulse, so front-end electronics can be simplified. The feasibility tests have been demonstrated at the X-ray beamline of SPring-8 in the term of (1) pulse intensity monitor, (2) pulse-by-pulse X-ray beam position monitor, and (3) the pulse-timing monitor. Then, we have improved the structure of the detector head in order to sophisticate the function as the pulse timing monitor. As a result, we successfully removed the ringing parts of output signal, and demonstrated that this monitor can be used as the timing monitor. We also describe a new scheme for beam diagnostics using this monitor.  
poster icon Poster MOPD91 [1.309 MB]  
 
MOPD92 Review of Recent Upgrades & Modernizations on Diagnostics in the ESRF Storage Ring and Injector 263
 
  • B. Joly, P. Arnoux, D. Robinson, K.B. Scheidt
    ESRF, Grenoble, France
  
  Over the last two years a number of upgrades and modernizations have been implemented on diagnostic tools in both the Injector system and the Storage Ring. Brand new diagnostic tools have also been added. In the Injector, a new Transfer Line current monitor has been installed, as well as four new ¼ λ Striplines equipped with Single-Pass Libera electronics. In the Storage Ring, a new Visible Light Mirror (VLM) system has replaced the original system that had been in place for more than 15 years. Also, the acquisition system for the DC Current Transformers has been upgraded with new hardware. Descriptions and results are presented on the improved reliability, sensitivity and resolution of these systems.  
 
MOPD93 Investigation of Diagnostic Techniques on a Nonneutral Plasma 266
 
  • K. Schulte, M. Droba, O. Meusel, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  
  Funding: Work supported by HIC for FAIR, BMBF No. 06FY90891.
Space charge lenses use a confined electron cloud for the focusing of ion beams. The focusing strength is given by the electron density whereas the density distribution influences the mapping quality of the space charge lens and is related to the confinement. The plasma parameters, loss as well as production mechanisms have a strong impact on plasma beam interactions. A scaled up space charge lens was constructed to investigate the properties of a nonneutral plasmas in detail. New non-interceptive diagnostic has been developed to characterize the collective behaviour of the confined nonneutral plasma in terms of an optimized lens design and parameters. Experimental results will be presented in comparison with numerical simulations. 		 
poster icon Poster MOPD93 [3.587 MB]  
 
MOPD96 The Mirror Mounting of a Fast Switching Mirror Unit at FLASH 269
 
  • F. Perlick, A. Donat, R. Heller, J. Nagler, M. Sachwitz, L.V. Vu
    DESY Zeuthen, Zeuthen, Germany
  
  To provide different beam lines with laser light from one source, a fast switching mirror unit that allows permanent switching with a frequency of up to 2.5 Hz was developed. One part of the study deals with the mirror and the design of its mounting in the chamber. The challenge lies in achieving a firm mounting of the mirror without significant mirror deformation, since the users demand only very few divergence of the laser beam at the test sites. The newest design of the mounting brought considerable improvement with regard to the pitching and the torsion of the mirror, which have an important impact on the beam divergence.  
 
MOPD97 Beam Position Monitor System for the CERN Linac4 272
 
  • J. Tan, L. Søby, M. Sordet
    CERN, Geneva, Switzerland
  
  The new LINAC4 will provide 160 MeV H¯ ion beams for charge-exchange and proton injection into the CERN accelerator complex. Among a wide variety of beam diagnostics devices, shorted stripline pick-ups will measure the absolute beam position, the relative and absolute beam current, and the average beam energy via the time-of-flight between two monitors. This paper describes the beam position monitor (BPM) with its electronic acquisition chain to be implemented on the movable test bench for beam characterization up to 12 MeV.  
 
TUOB01 Options for Next Generation Digital Acquisition Systems 289
 
  • A. Boccardi
    CERN, Geneva, Switzerland
  
  Digital acquisition system designers have an always increasing number of options in terms of bus standards and digital signal processing hardware among which to choose. This allows for a high flexibility but also open the door to a proliferation of different architectures, potentially limiting the reusability and the design synergies among the various instrumentation groups. This contribution illustrates the design trends in some of the major institutes around the world with design examples including VME, PCI and μTCA based modular systems using AMC and/or FMC mezzanines. Some examples of FPGA design practices aimed to increase reusability of code will be mentioned together with some of the tools already available to designers to improve the information exchange and the collaboration, like the Open Hardware Repository project.  
slides icon Slides TUOB01 [3.543 MB]  
 
TUOB02
 Designing Electronics for Use in Radiation Environments  
 
  • C. Zamantzas
    CERN, Geneva, Switzerland
  
  In this talk, an overview will be provided on the necessary steps a new project will need to take to ensure the requirements in terms of resilience to the dose accumulated and single event effects. Information will be given on the different design options and the available tools designers can employ to augment the tolerance of the system as well as the techniques developed to mitigate the problems that can arise in radiation environments. It will be also shown how the knowledge of the expected fluence and flux, together with the given specifications will dictate the conceptual design, the component choices limited to use, and the required validation and quality assurance through irradiation testing that will be necessary to be undertaken.  
slides icon Slides TUOB02 [1.250 MB]  
 
TUOB03 Next Generation Electronics based on μTCA for Beam-Diagnostics at FLASH and XFEL 294
 
  • P. Gessler, M.K. Bock, M. Bousonville, M. Felber, M. Hoffmann, T. Jezynski, T. Lamb, F. Ludwig, G. Petrosyan, L.M. Petrosyan, K. Rehlich, S. Schulz, P. Vetrov, M. Zimmer
    DESY, Hamburg, Germany
  • C. Bohm, A. Hidvégi
    Stockholm University, Stockholm, Sweden
  • K. Czuba
    Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
  • D.R. Makowski
    TUL-DMCS, Łódź, Poland
  
  Funding: This work is partly supported by IRUVX-PP an EU co-funded project under FP7 (Grant Agreement 211285).
Almost all accelerator-related diagnostic and steering systems require front-end electronic hardware and software for digitizing, synchronization, processing, controlling, and providing access to the control system. Increasingly high demands on resolution, bandwidth, stability, redundancy, low latency, real-time processing and distribution create the need for new technologies in order to fulfill those demands. For this reason, at the European XFEL and FLASH, the new, μTCA industry standard will be deployed. Over the last few years, significant achievements have been made in μTCA developments in collaboration with other research institutes and industry. In this paper, we give an overview of the required components of a typical μTCA system for diagnostics applications. The FLASH bunch arrival-time monitor will be used as an example. 		 
slides icon Slides TUOB03 [9.075 MB]  
 
TUOC01 Highlights from the 2010 Beam Instrumentation Workshop 297
 
  • J.D. Gilpatrick
    LANL, Los Alamos, New Mexico, USA
  
  Funding: Work supported by the U.S. Department of Energy.
The 14th Beam Instrumentation Workshop (BIW10) was hosted by the Los Alamos National Laboratory and was held in the La Fonda Hotel in downtown Santa Fe, NM, USA from May 3 – 6, 2010. At BIW10, there were a record amount of participants including 177 registered attendees, 92 poster presentations, and 22 companies represented. The oral presentations included 3 tutorials, 8 invited, 10 contributed, a Faraday Cup Award, 2 Vendor Technical, and 1 Special. This oral presentation provides an overview of beam instrumentation areas of interest, which were discussed during the workshop. From a selection of the BIW10 presented papers, a number of technical highlights will also be described. Finally, this oral presentation will briefly discuss the BIW10 Thursday afternoon tour that took place at the Los Alamos Neutron Science Center. 		 
slides icon Slides TUOC01 [3.110 MB]  
 
TUPD82 First Results of the LHC Collision Rate Monitors 497
 
  • E. Bravin, S. Bart Pedersen, A. Boccardi, S. Burger, C. Dutriat
    CERN, Geneva, Switzerland
  • L.R. Doolittle, H.S. Matis, M. Placidi, A. Ratti, H. Yaver, T. stezelberger
    LBNL, Berkeley, California, USA
  • R. Miyamoto
    BNL, Upton, Long Island, New York, USA
  
  Funding: This work is partially supported by the US DoE through US-LARP
The aim of CERN’s large hadron collider (LHC) is to collide protons and heavy ions with centre of mass energies up to 14 zTeV. In order to monitor and optimize the collision rates special detectors have been developed and installed around the four luminous interaction regions. Due to the different conditions at the high luminosity experiments, ATLAS and CMS, and the low luminosity experiments, ALICE and LHC-b, two very different types of monitors are used, a fast ionisation chamber (BRAN-A) and a Cd-Te solid state detector (BRAN-B) respectively. Moreover in order to cope with the low collision rates foreseen for the initial run a third type of monitor, based on a simple scintillating pad, was installed in parallel with the BRAN-A. This contribution illustrates the results obtained during the 2010 run with an outlook for 2011 and beyond. 		 
 
TUPD83 Photodiode Calibration using an Electrical Substitution Radiometer in the Hard X-ray Region 500
 
  • N.I. Bolibruch, R. Igarashi, J.M. Vogt
    CLS, Saskatoon, Saskatchewan, Canada
  
  Funding: Work supported by NSERC, NRC, CIHR, WEDC.
An electrical substitution radiometer under development at the Canadian Light Source (CLS) has been used to calibrate a photodiode (AXUV100) from International Radiation Detectors Inc. within an energy range of 8 keV to 30 keV. These measurements were made using monochromatic X-rays on the Biomedical Imaging and Therapy bend magnet beam line and the Hard X-Ray Microanalysis beam line at the CLS. The results were then compared with silicon absorption calculations using data from the NIST mass absorption coefficient tables. Good agreement has been found between the diode calibration obtained from the radiometer and the theoretical calculation of the diode response. 		 
 
TUPD85 Photoinjector Based MeV Electron Microscopy 503
 
  • J. Yang, K. Kan, T. Kondoh, Y. Yoshida
    ISIR, Osaka, Japan
  • J. Urakawa
    KEK, Ibaraki, Japan
  
  A time-resolved MeV electron microscopy based on a photocathode rf electron gun is being developed in Osaka University to reveal the hidden dynamics of intricate molecular and atomic processes in materials. A new structure rf gun has been developed to generates a high-brightness femtosecond-bunch electron beam. The microscopy has been used successfully for the single-shot MeV electron diffraction measurement and the time-resolved measurement. The transverse emittance, bunch length and energy spread were diagnosed as the functions of the laser injection phase, the laser pulse width and the bunch charge. The growths of the emittance, bunch length and energy spread due to the rf and the space charge effects in the rf gun were investigated.  
 
TUPD87 Fuzzy Logic Controls of a Particle Accelerator 509
 
  • O.F. Toader
    NERS-UM, Ann Arbor, Michigan, USA
  
  The ion beams produced in a particle accelerator have to be characterized and monitored using parameters specific to the instruments involved and information from practical (hands-on) operation of those instruments and of the accelerator as a whole. The control is critical considering the multitude of equipment and tasks involved. It is a nonlinear, non-standard process difficult to model. This paper will presents the progress that is currently being made in the attempt to implement fuzzy logic theory in controlling parts of the 1.7 MV Tandem particle accelerator at the Michigan Ion Beam Laboratory.  
 
TUPD88 A Micro-Channel Plate Based RFA Electron Cloud Monitor for the ISIS Proton Synchrotron 512
 
  • A. Pertica, S.J. Payne
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  
  Electron clouds produced inside a particle accelerator vacuum chamber by the passage of the beam can compromise the operation of the accelerator. The build up of electron clouds can produce strong transverse and longitudinal beam instabilities which in turn can lead to high levels of beam loss often requiring the accelerator to be run below its design specification. To study the phenomena of electron clouds at the ISIS Proton Synchrotron, a Micro-Channel Plate (MCP) based electron cloud detector has been developed. The detector is based on the Retarding Field Analyser (RFA) design and consists of a retarding grid, which provides energy analysis of the electron signal, and a MCP assembly placed in front of the collector plate. The MCP assembly provides a current gain over the range 300 to 25K, thereby increasing the signal to noise ratio and dynamic range of the measurements. In this paper, we describe the lab based experiment used to test our detector using a low energy electron gun. Results from our MCP based detector installed in the ISIS accelerator ring are discussed and compared to a RFA detector, installed at the same location, which has no MCP fitted.  
poster icon Poster TUPD88 [1.793 MB]  
 
TUPD89 Polarimetry of 0.1 – 130 MeV Electron Beams at the S-DALINAC* 515
 
  • C. Eckardt, P. Bangert, R. Barday, U. Bonnes, R. Eichhorn, J. Enders, C. Ingenhaag, Y. Poltoratska, M. Wagner
    TU Darmstadt, Darmstadt, Germany
  
  Funding: * Work supported by DFG through SFB 634 and by the state of Hesse through the Helmholtz International Center for FAIR in the framework of the LOEWE program.
A source of polarized electrons[1] has been installed at the superconducting 130 MeV Darmstadt electron linear accelerator S-DALINAC[2], augmenting the experimental program for nuclear structure studies and fundamental experiments. Polarized electrons from a strained-superlattice GaAs cathode are electrostatically accelerated to 100 keV. In the low-energy beam line the beam parameters are measured using diagnostic elements like wire scanners and RF-monitors, a Wien filter for spin manipulation and a 100 keV Mott polarimeter for polarization measurement. Following a superconducting accelerator section, electron beams with 5-10 MeV energy are used for bremsstrahlung experiments. Here, the absolute degree of polarization will be measured using a Mott polarimeter, while monitoring the beam polarization during the experiment with a Compton transmission polarimeter. Alternatively, the electron beam can be further accelerated in the recirculating superconducting main linac. For beam energies of 50-130 MeV a Moeller polarimeter as well as two Compton transmission polarimeter are foreseen. We report on the performance of the polarized source and the polarimeter design and installation.
[1] C. Eckardt et al., IPAC 10, Kyoto, _THPEC019_, p 4083.
[2] A. Richter, Proc. EPAC 96, Sitges, _WEX02A_, p.110.
 		 
 
TUPD90 POMPOMs: Cost-Efficient Polarity Sensors for the MICE Muon Beamline 518
 
  • J.J. Nebrensky
    Brunel University, Middlesex, United Kingdom
  • P.M. Hanlet
    IIT, Chicago, Illinois, USA
  
  Funding: STFC (UK)
The cooling effect in MICE (Muon Ionisation Cooling Experiment) will be studied with both positive and negative muons, reversing the electrical input to the magnets by physically swapping over the power leads. Ensuring the actual operating polarity of the beamline is correctly recorded is a manual step and at risk of error or omission. We have deployed a simple system for monitoring the operating polarity of the two bending magnets by placing in each dipole bore a Honeywell LOHET-II Hall-effect sensor that operates past saturation at nominal field strengths, and thus return one of two well-defined voltages corresponding to the two possible polarities of the magnet. The environment in the experimental hall is monitored by an AKCP securityProbe 5E system integrated into our EPICS-based controls and monitoring system. We read out the beamline polarity sensors using a voltmeter module, and translate the output voltage into a polarity (or alarm) state within EPICS whence it can be accessed by the operators and stored in the output datastream. Initial test of the LOHET-II sensors indicates they will still be able to indicate beamline polarity after radiation doses of 600 Gy (Co60).
We'd like to thank Prof. Peter Hobson and Dr David Smith at Brunel University for performing the sensor irradiation 		 
poster icon Poster TUPD90 [0.627 MB]  
 
TUPD91 Comparative Studies of Reconstruction Methods to Achieve Multi-Dimensional Phase Space Information 521
 
  • C. Gabor
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  • A.P. Letchford
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • D. Reggiani, M. Seidel
    PSI, Villigen, Switzerland
  
  High Intensity Proton Accelerators like SNS, PSI or future machines like ESS or Isis upgrade cannot tolerate high losses due to activation. Standard beam diagnostics may not provide enough information about potential loss sources like beam filamentation or halo. Moreover, the application of interceptive methods like slits or pepperpot can be seriously discouraged by either high power deposition or explicit requirements for non-destructive methods like on-line diagnostics near superconducting cavities. Reconstruction of the beam distribution with a tomography method based on Maximum Entropy could help to overcome those problems and is easily to integrate in already existing facilities because the algorithm does not depend on the experimental profile measurement technique. Furthermore beam tomography can be employed on both spatial and phase-space reconstruction. The paper compares results from two different software packages from PSI (Maximum Entropy Tomography MENT) with the code used at RAL (MemSys 5).  
 
TUPD93 Diagnostics of RF Breakdowns in High-Gradient Accelerating Structures 527
 
  • A. Palaia
    Uppsala University, Uppsala, Sweden
  • V.A. Dolgashev, J.R. Lewandowski, S.P. Weathersby
    SLAC, Menlo Park, California, USA
  
  Within the framework of the research on high-gradient accelerating structures for future linear colliders, diagnostics of radio-frequency (RF) breakdowns is of great importance to support the understanding of the vacuum breakdown process. Measurements of RF and electron and ion currents emitted during and after a breakdown can be used to calculate the properties of any objects responsible for such power reflection and charge emission. Possible breakdown models, breakdown localization and a time-scale of the process are here discussed and compared to dedicated measurements. First results are presented.  
poster icon Poster TUPD93 [7.029 MB]  
 
TUPD94 Monitoring of GeV Deuteron Beam Parameters in ADS Experiments at the Nuclotron (JINR, Dubna) 530
 
  • A.A. Safronava, A.A. Patapenka
    JIPNR-Sosny NASB, Minsk, Belarus
  • V.V. Sotnikov, V.A. Voronko
    NSC/KIPT, Kharkov, Ukraine
  • O. Svoboda
    NPI, Řež near Prague, Czech Republic
  • W. Westmeier
    Philipps-Universität, Marburg, Germany
  
  The quality of beam instrumentation is very important in the experiments on accelerator driven systems (ADS) aiming to investigate spatial and energy distribution of neutrons inside and outside the subcritical setups comprising spallation neutron sources irradiated by relativistic beams. An important source of systematic uncertainties of the experimental data is the inaccuracy of determination of the beam parameters such as total intensity of the extracted beam, beam position at the target, fraction of the beam hitting the target and beam shape. This paper reviews the experimental techniques and measurement tools for deuteron beam monitoring used within the “Energy plus Transmutation” collaboration in the ADS experiments at the accelerator complex of Nuclotron (JINR, Russia): - activation technique using Al monitors for measurement of the total intensity of the extracted beam; - solid nuclear track detectors method and activation technique using segmented activation Cu foils for determination of beam profile and position at the target.  
poster icon Poster TUPD94 [13.019 MB]  
 
TUPD97 Diagnostic System of TAC IR FEL Facility 536
 
  • Z. Nergiz
    N.U, Nigde, Turkey
  • A. Aksoy
    Ankara University, Faculty of Engineering, Tandogan, Ankara, Turkey
  • S. Ceylan, S. Özkorucuklu
    SDU, Isparta, Turkey
  • C. Kaya
    HZDR, Dresden, Germany
  
  The TAC (Turkish Accelerator Center) IR FEL facility which is named as Turkish Accelerator and Radiation Laboratory at Ankara, TARLA will be based on a 15-40 MeV electron linac accompanying two different undulators with 2.5 cm and 9 cm periods in order to obtain IR FEL ranging between 2-250 microns. The electron linac will consist of two sequenced modules, each housing two 9-cell superconducting TESLA cavities for cw operation. It is planned that the TARLA facility will be completed in 2013 at Golbasi campus of Ankara University. This facility will give an opportunity to the scientists and industry to use FEL in research and development in Turkey and our region. In this study, the main structure of the facility and planned electron beam diagnostics system is given in detail.  
poster icon Poster TUPD97 [0.514 MB]