Keyword: diagnostics
Paper Title Other Keywords Page
MOPEA001 Status of the Australian Synchrotron Top-Up Operations injection, storage-ring, synchrotron, linac 58
 
  • M.J. Boland, R.T. Dowd, G. LeBlanc, D.C. McGilvery, D. Morris, Y.E. Tan, J. Trewhella, D. Zhu, E.D. van Garderen
    ASCo, Clayton, Victoria, Australia
  
  In May 2012 the Australian Synchrotron commenced Top-Up Operations for User beamtime. The facility was designed for top-up from the start with a full energy 3 GeV injection system, however top-up only became a priority once the beamline user community had established itself at the new facility in operation since April 2007. New beam diagnostic and equipment protections systems were implemented as part of the move to top-up, including a new injection efficiency monitoring system. The effect of top-up on the beamline data was also tested with each beamline prior to engaging top-up during user runs. Top-up has now been running successfully for one year and the performance statistics from this period will be presented. Top-up operations is a very popular standard mode for user beam and falling into decay mode is now treated almost as a beam dump.  
 
MOPEA022 Beam Profile Measurement for High Intensity Electron Beams electron, laser, scattering, photon 118
 
  • T. Weilbach, K. Aulenbacher, M.W. Bruker
    HIM, Mainz, Germany
  • K. Aulenbacher
    IKP, Mainz, Germany
  
  Recent developments in the field of high intensity electron beams in the regime below 10 MeV, e.g. energy recovery linacs or magnetized high energy electron coolers, have led to special demands on the beam diagnostics. Since commonly used diagnostic tools like synchrotron radiation and scintillation screens are ineffective or not able to withstand the beam power without being damaged, new methods are needed. Hence a beam profile measurement system based on beam induced fluorescence (BIF) was built. This quite simple system images the light generated by the interaction of the beam with the residual gas onto a PMT. A more elaborated system, the Thomson Laser Scanner (TLS) - the non-relativistic version of the Laser Wire Scanner - is proposed as a method for non-invasive measurement of all phase space components, especially in the injector and merger parts of an ERL. Both methods are implemented in a 100 keV photo gun. Beam profile measurements with BIF as well as first results of the TLS will be presented.  
 
MOPEA061 Operation Experience at Taiwan Light Source kicker, SRF, cavity, injection 220
 
  • Y.-C. Liu, H.H. Chen, H.C. Chen, S. Fann, S.J. Huang, J.A. Li, C.C. Liang, Y.K. Lin, Y.-H. Lin, M.-S. Yeh
    NSRRC, Hsinchu, Taiwan
  
  A matrix structure has been implemented for the purpose of successful operation of TLS and continuous progress of Taiwan Photon Source (TPS) construction. A dedicated and flexible manpower distribution has proven it could keep as same performance of TLS operation as possible. We will summarize the machine operation experience at TLS during TPS civil construction period.  
 
MOPFI027 The Progress of the BRISOL Facility at CIAE ion, target, ion-source, vacuum 339
 
  • B. Tang, L.H. Chen, B.Q. Cui, Q.H. Huang, W. Jiang, R. Ma, Y.J. Ma, Z. Peng
    CIAE, Beijing, People's Republic of China
  
  Beijing Radioactive Ion-beam Facilities Isotope Separator On-Line (BRISOL), aiming to generate short life radioactive ion beam (RIB) on-line, is being constructed at China Institute of Atomic Energy(CIAE). Up to now, construction of major equipment for BRISOL is completed, including ion source, vacuum system, separator, optical element, and beam diagnostic system, and assembling is underway in laboratory. The on-site installation of all the beam line will be carried out soon. All the major element prototype including surface ion source, quadrupole, hexapole, multipole and beam diagnostic system have been studied off-line on a test-bench for BRISOL. A Li beam was generated and separated . The primary tests show that the ion source and the optical elements work well. The test charge exchange cell (CEC) is under way. BRISOL will be commissioned next year.  
 
MOPFI065 VELA (formerly EBTF) Simulations and First Beam Commissioning gun, simulation, laser, electron 431
 
  • J.W. McKenzie, D. Angal-Kalinin, J.K. Jones, B.L. Militsyn
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  VELA (Versatile Electron Linear Accelerator), formerly known as EBTF (Electron Beam Test Facility), at STFC Daresbury Laboratory, is a photoinjector test facility which will provide beam into two user areas for scientific and industrial applications. It is based on a 2.5 cell S-band RF photoinjector driven by a Ti:Sapphire laser. The design is aimed to deliver short bunches at 10-250 pC charge with low transverse emittance. We present beam dynamics simulations of VELA as well as the results from first beam commissioning.  
 
MOPME007 High Resolution Synchrotron Light Analysis at ELSA synchrotron, vacuum, optics, electron 482
 
  • S. Zander, F. Frommberger, P. Hänisch, W. Hillert, M.T. Switka
    ELSA, Bonn, Germany
  
  Funding: Funded by the DFG within the SFB/ TR 16
The Electron Stretcher Facility ELSA provides polarized electrons with energies up to 3.5 GeV for external hadron experiments. In order to suffice the need of stored beam intensities towards 200 mA, advanced beam instability studies need to be carried out. An external diagnostic beamline for synchrotron light analysis has been set up and provides the space for multiple diagnostic tools including a streak camera with time resolution of < 1 ps. Beam profile measurements are expected to identify instabilities and reveal their thresholds. The effect of adequate countermeasures is subject to analysis. The current status of the beamline development will be presented. 		 
 
MOPME011 Investigation of the Applicability of Parametric X-ray Radiation for Transverse Beam Profile Diagnostics radiation, photon, electron, background 491
 
  • G. Kube, C. Behrens
    DESY, Hamburg, Germany
  • A.S. Gogolev, Yu.A. Popov, A. Potylitsyn
    TPU, Tomsk, Russia
  • W. Lauth
    IKP, Mainz, Germany
  • S. Weisse
    DESY Zeuthen, Zeuthen, Germany
  
  Transverse beam profile diagnostics in electron linacs is widely based on optical transition radiation (OTR) as standard technique which is observed in backward direction when a charged particle beam crosses the boundary between two media with different dielectric properties. The experience from modern linac based light sources like LCLS or FLASH shows that OTR diagnostics might fail because of coherence effects in the OTR emission process. A possibility to overcome this limitation is to measure at much shorter wavelengths, i.e. in the X-ray region, using parametric X-ray radiation (PXR) which additionally offers the advantage to be generated at crystal planes oriented under a certain angle to the crystal surface, thus allowing a spatial separation from a possible COTR background *. A first test experiment has been performed at the Mainz Microtron MAMI (University of Mainz, Germany) in order to study the applicability of PXR for beam diagnostics, and the status of this experiment will be presented.
* A. Gogolev, A. Potylitsyn, G. Kube, Journal of Physics 357 (2012) 012018
 		 
 
MOPME012 Single-bunch Longitudinal Phase Space Diagnostics in Multi-bunch Mode at the European XFEL septum, simulation, dipole, electron 494
 
  • M. Yan, C. Gerth
    DESY, Hamburg, Germany
  
  Dedicated longitudinal electron beam diagnostics is highly demanded for the control and optimization of modern X-ray free-electron lasers (XFEL). At the European XFEL, 3 transverse deflecting structures (TDS) will be installed at different locations of the accelerator for measurements of slice emittance and longitudinal profile. Operation of a TDS in combined use with an energy spectrometer, e.g. a dispersive section after a single dipole magnet, allows additionally for longitudinal phase space (LPS) measurements. However, utilization of a dipole magnet is not compatible with single-bunch measurements in multi-bunch operation mode, which will be the standard operation mode of the European XFEL. In this paper, we propose a LPS diagnostic beamline consisting of a TDS, fast kicker and septum magnet for the European XFEL. The layout of the accelerator lattice with optimized optics for LPS measurements will be presented.  
 
MOPME028 A Preliminary Study of the Vibration Wire Monitor for Beam Halo Diagnostic in J-PARC L3BT proton, electron, injection, linac 535
 
  • K. Okabe, M. Kinsho, K. Yamamoto, M. Yoshimoto
    JAEA/J-PARC, Tokai-mura, Japan
  
  In the J-PARC 3-GeV Rapid Cycle Synchrotron (RCS), transverse beam halo diagnostic and scraping are required to increase the output beam power. Wire scanners and halo scrapers were used for measurement of projected beam distributions to determine the extent of beam halo formation at Linac-3GeV Beam Transport line (L3BT). In order to determine more detail of halo formation, Vibration Wire Monitor (VWM) was installed in L3BT for the beam halo measurement and the offline study at the test stand with low energy electron gun are started. The high sensitivity of the VWM makes it a prospective one for investigation of beam halo and weak beam scanning. In this paper, we will report a preliminary results of offline studies and beam halo measurement by VWM at L3BT.  
 
MOPME035 Design of a Non-Intercepting Beam Diagnostic Device Using Neutral Beam Fluorescence Method emittance, neutral-beams, ion, target 547
 
  • J. Zhao, J. Chen, J.E. Chen, Z.Y. Guo, S.X. Peng, H.T. Ren, Y. Xu, A.L. Zhang, T. Zhang
    PKU, Beijing, People's Republic of China
  • H.W. Zhao
    IMP, Lanzhou, People's Republic of China
  
  The forward neutral beam from deflecting magntic field carries some characteristic properties of high intensity particle beams, such as profile, emittance etc. Therefore a reliable measurement of neutral beam fluorescence can be used to develop a fast and non-interceptive beam diagnostic tool. A non-intercepting beam emittance (profile) monitor using neutral beam fluorescence method has being constructed at Peking University. As a performance test, an emttiance of an extracted proton beam from a permanent magnetic electron cyclotron resonance (ECR) ion source was successfully measured. The details of design and results of measurement will be presented in this paper.  
 
MOPME040 Cavity-based Multi-parameter Beam Diagnostics at HLS cavity, quadrupole, emittance, gun 559
 
  • Q. Luo, B.G. Sun
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Funding: Natural Science Foundation of China (11005106)
Recent developments of the fourth generation light sources needs precious control of beam parameters, such as beam position, transverse emittance, beam density, bunch length, etc.. Non-destructive on-line beam diagnostic methods are then required. As an example, the cavity beam multi-parameter monitor system designed for the HLS photocathode RF electron gun consists of a beam position monitor, a beam quadrupole moment monitor and a beam density and bunch length monitor. The cavity beam position monitor uses a re-entrant position cavity tuned to TM110 mode as position cavity and cut-through waveguides to suppress the monopole signal. Beam quadrupole moment monitor system consists of a square pill-box quadrupole moment cavity, a cylindrical pill-box reference cavity and a waveguide coupling network. TM0n0 modes of cavity can be used to work out beam density and bunch length simultaneously. To simplify the design and suppress the whole system here, we use the reference cavity of beam position monitor as beam density and bunch length signal pick-up. 		 
 
MOPME049 Status of Non-destructive Bunch Length Measurement based on Coherent Cherenkov Radiation radiation, electron, target, vacuum 583
 
  • H.X. Deng, S.L. Lu, T. Yu, J.B. Zhang
    SINAP, Shanghai, People's Republic of China
  • G.A. Naumenko, A. Potylitsyn, M.V. Shevelev, D.A. Shkitov
    TPU, Tomsk, Russia
  
  Funding: This work was supported by the joint Russian-Chinese grant (RFBR 110291177 and NSFC 11111120065) and partially by the Program of Russian MES “Nauka” and the Chinese NSFC 11175240.
As a novel non-destructive bunch length diagnostic of the electron beam, an experimental observation of the coherent Cherenkov radiation generated from a dielectric caesium iodide crystal with large spectral dispersion was proposed for the 30MeV femtosecond linear accelerator at Shanghai Institute of Applied Physics (SINAP). In this paper, the theoretical design, the experimental setup, the terahertz optics, the first angular distribution observations of the coherent Cherenkov radiation, and the future plans are presented.
* Shevelev M. et al., Journal of Physics: Conf. Ser. 357 (2012) 012023. 		 
 
MOPME060 Introduction to Beam Diagnostics Components for PAL-ITF electron, laser, gun, radiation 610
 
  • H. J. Choi, M.S. Chae, J.H. Hong, C. Kim, D.T. Kim, S.J. Park
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  Pohang Accelerator Laboratory (PAL) is building the 4th generation X-ray free electron laser (XFEL). The Injection Test Facility (ITF) is a test facility established to improve the functions of the laser gun and pre-injector to be installed in XFEL. To improve the effects of ITF, two factors are required. The first is to be able to generate low-emittance electron beams stably at the laser gun, and the second is to control increasing emittance by space charge effect by accelerating electron beams with high energy at the pre-injector. In this way, high-quality electron beams can be materialized. Various beam diagnostics are installed in the accelerator system for beam diagnostics and measurements. Five kinds of beam diagnostics were installed in the PAL-ITF. These are (1) ICT and (2) Faraday Cup to measure current and electrons charge, (3) Stripline BPM to measure the location of beams, (4) a YAG/OTR Screen Monitor to measure beam energy and transverse profile motion and (5) a Wire Scanner to measure beam size. In this paper, the purposes and properties of each diagnostic unit and measurement results are introduced.  
 
MOPME062 UV and X-ray Diffraction Radiation for Submicron Noninvasive Diagnostics radiation, target, polarization, electron 616
 
  • D.Yu. Sergeeva, M.N. Strikhanov, A.A. Tishchenko
    MEPhI, Moscow, Russia
  
  Funding: This work was partially supported by Russian Ministry of Education and Science (State contract 12.527.12.5002).
Diffraction radiation (DR) arises when a charged particle moves near a target. The theory of X-ray DR from single particles was created in [*, **], and recently the theory has been developed for bunches [***]. DR from relativistic particles is used for noninvasive bunch diagnostics and also for creating new and effective sources of radiation, including Free-electron laser based on the Smith-Purcell effect. In the present work we explore theoretically DR from the bunch of ultrarelativistic charged particles at X-ray and UV frequencies domains. It is shown that incoherent part of form-factor, describing the effect of N electrons in bunch, exists and differs from the unity. The coherent part of radiation depends on transversal size of the bunch as ratio of the Bessel function to its argument. The coherence effects are proved to be important up to the wavelengths much less than transversal size of the bunch. The results obtained open the possibility to diagnose bunches of the submicron size with very high accuracy.
* A.A. Tishchenko et al, PLA. 359 (2006) 509.
** A.P. Potylitsyn et al, Diffraction radiation from relativistic particles, Springer, 2010
*** D.Yu. Sergeeva et al, Proc. Channeling-2012, p.52, 2012 		 
 
MOPME063 Backward X-ray Transition Radiation from Multilayered Target for Submicron Beam Diagnostics radiation, target, polarization, electron 619
 
  • A.A. Tishchenko, D.Yu. Sergeeva, M.N. Strikhanov
    MEPhI, Moscow, Russia
  • K.O. Kruchinin
    Royal Holloway, University of London, Surrey, United Kingdom
  
  Funding: This work was partially supported by Russian Ministry of Education and Science (State contract 12.527.12.5002).
Backward transition radiation (TR) is a TR arising in the direction of mirror reflection relative to the charged particles trajectory. Therefore for oblique incidence it can be emitted under big angles which is useful from point of view of measuring of the radiation. In spite of the fact that backward TR in X-ray frequency domain is much weaker than forward TR [*], it has recently been proposed by A.P. Potylitsyn and others [**] as an instrument for submicron electron beam diagnostics. In this work we propose to use the multilayered target in order to enhance the resulting radiation, i.e. to use resonant backward X-ray TR. So far X-ray TR has not been explored theoretically for backward geometry. It is shown that the expressions obtained coincide in special case of forward resonant X-ray TR with the results by L. Durand (***) and X. Artru (****). We explore the spectral and angular characteristics of resonant backward X-ray TR form point of view of submicron beam diagnostics for the ultrarelativistic charged particles bunches. The role of absorption in the target material and also the coherent and incoherent parts of the radiation is analyzed
* A.A. Tishchenko et al, NIMB 227 (2005) 63.
** L.G. Sukhikh et al, J of Phys: Conf. Ser. 236 (2010) 012011.
*** L. Durand, Phys Rev D11 (1975) 89.
**** X. Artru et al, Phys Rev D12 (1975) 1289.
 		 
 
MOPME065 Approximate Method of Calculation of a Bunch Radiation in Presence of Complex Dielectric Object radiation, vacuum, optics, scattering 625
 
  • A.V. Tyukhtin, E.S. Belonogaya, S.N. Galyamin
    Saint-Petersburg State University, Russia
  
  Funding: Work supported by the Grant of President of Russian Federation, Russian Foundation for Basic Research, and the Dmitry Zimin "Dynasty" Foundation.
Cherenkov radiation is widely used for detection of charged particles and can be also applied for particle bunch diagnostics*. As a rule, dielectric objects applied for these goals have complex forms. Therefore development of methods of calculation of bunch radiation in presence of complex dielectric objects is now of a great interest. The approximate method developed by us allows to take into account influence of the object boundaries closed to the charge trajectory as well as "external" boundaries of the object. The case of the charge crossing a dielectric plate was considered as a test problem. The exact solution of this problem is in a good agreement with our approximate solution. Next, the cases of more complex objects were analyzed. One of them is a dielectric cone with a vacuum channel. Particularly, it was shown that radiation can be convergent under certain conditions, that is the field outside the cone can be more intensive than on the cone boundary. Radiation of the bunch in the case of dielectric prism was considered as well.
* A.P. Potylitsyn, Yu.A. Popov, L.G. Sukhikh, G.A. Naumenko, M.V. Shevelev, Journal of Physics: Conference Series 236 (2010) 012025. 		 
 
MOPME066 Radiation of a Charged Particle Bunch Moving along Boundary of Wire Metamaterial radiation, vacuum, lattice, optics 628
 
  • A.V. Tyukhtin, S.N. Galyamin, V.V. Vorobev
    Saint-Petersburg State University, Russia
  
  Funding: Work supported by Russian Foundation for Basic Research and the Dmitry Zimin “Dynasty” Foundation.
The material under consideration represents a periodical volume structure of long parallel conductive wires. If wavelengths are much greater than periods, the structure can be described as some anisotropic medium possessing both frequency and spatial dispersion* (so-called wire metamaterial). Earlier we considered the radiation of bunches moving in boundless wire metamaterial. It has been discovered that this radiation is nondivergent, and it is perspective for diagnostics of bunches**. Now we consider the case when the bunch moves in vacuum along the boundary of the semi-infinite metamaterial perpendicularly to the wires. Analytical and numerical analysis of the problem is performed. It is shown that radiation from a point charge concentrates in some vicinity of certain planes and propagates along the wires with speed of light. Series of computations show that the radiation under consideration can be useful for determination of sizes and shape of bunch.
*A.V. Tyukhtin, E.G. Doilnitsina, J. Phys. D - Appl. Phys., 44, 265401 (2011).
**V.V. Vorobev, A.V. Tyukhtin, Phys. Rev. Lett., 108, 184801 (2012).
 
 
MOPME067 Non-Invasive Bunch Length Diagnostics Based on Interferometry From Double Diffraction Radiation Target target, radiation, electron, FEL 631
 
  • D.A. Shkitov, G.A. Naumenko, A. Potylitsyn, M.V. Shevelev
    TPU, Tomsk, Russia
  • H.X. Deng, S.L. Lu, T. Yu, J.B. Zhang
    SINAP, Shanghai, People's Republic of China
  
  Funding: This work was supported by the joint Russian-Chinese grant (RFBR 110291177 and NSFC 11111120065) and partially by the Program of Russian MES “Nauka” and the SINAP Xinrui Program Y15501A061.
Reliable and precise non-invasive beam diagnostics technique to measure length of sub-picosecond electron bunches are required for new accelerator facilities (FEL, et al.). Investigations of coherent radiation generated by such bunches using different interferometers allow to determine a bunch length*. Measuring a dependence of radiation yield intensity from two DR targets on a distance between them (the intrinsic DR interferogram), it is possible to obtain the same information. Such a non-invasive technique can be directly used for ultra-short bunch length measurements. Recently the first experiment with a double DR target was carried out at the SINAP fs linac facility** with parameters described in***. The double DR target was consisted of two plates made from Al foil. The pyro-electric detector SPI-D-62 was used. Here we report the results of the second stage of our investigations. The DR interferograms of different electron bunch length were measured. The bunch length was reconstructed using the heuristic model based on the dimension theory and simulation data. We compare the results from DR interferograms and Michelson interferometer measurements and show their similarity.
*Murokh A. et al., NIMA 410 (1998) 452.
**Zhang J.B., Shkitov D.A. et al., IBIC’12 MOPB65 (2012).
***Lin X., Zhang J. et al., Chin. Phys. Let. V. 27 N. 4 (2010) 044101. 		 
 
MOPME069 Multi-OTR System for Linear Colliders emittance, target, optics, linac 637
 
  • J. Resta-López, A. Faus-Golfe
    IFIC, Valencia, Spain
  • J. Alabau-Gonzalvo, R. Apsimon, A. Latina
    CERN, Geneva, Switzerland
  
  We study the feasibility of using a multi-Optical Transition Radiation (mOTR) system for fast transverse emittance reconstruction and x-y coupling correction in the Ring to Main Linac (RTML) of the future linear colliders: ILC and CLIC. OTR monitors are mature and reliable diagnostic tools that could be very suitable for the setup and tuning of the machine in single-bunch mode. Here we study the requirements for a mOTR system adapted to the optical conditions and beam parameters of the RTML of both the ILC and CLIC.  
 
MOPME072 Performance Tests of a Short Faraday Cup Designed for HIE-ISOLDE electron, ion, cryomodule, cryogenics 646
 
  • E.D. Cantero, W. Andreazza, E. Bravin, M.A. Fraser, D. Lanaia, A.G. Sosa, D. Voulot
    CERN, Geneva, Switzerland
  
  Funding: E.D.C, D.L. and A.S. acknowledge CATHI Marie Curie ITN: EU-FP7-PEOPLE-2010-ITN Project number 264330. M.A.F acknowledges co-funding by the European Commission (Grant agreement PCOFUND-GA-2010-267194)
The On-Line Isotope Mass Separator (ISOLDE) facility at CERN is being upgraded in order to deliver higher energy and intensity radioactive beams. The final setup will consist in replacing the energy variable part of the normal conducting REX post-accelerator with superconducting cavities. In order to preserve the beam emittance, the drift space between the cryomodules housing these cavities has been kept to a minimum. As a consequence, the longitudinal space available for beam diagnostics is severely limited in the inter-cryomodule regions. A Faraday cup (FC) will be installed to measure beam currents, and due to the tight spatial constraints, its length is much smaller than usual. This poses a great challenge when trying to avoid the escape of ion-induced secondary electrons, which would falsify the current measurement. Two prototypes of such a short FC have therefore been tested at REX-ISOLDE using several beam intensities and energies, with the aim of determining its accuracy. In this paper the experimental results obtained for the two prototype cups are presented together with numerical calculations of the electrostatic fields that are produced inside the cup. 		 
 
MOPWA049 Status Report of the FETS Photo Detachment Emittance Instrument at RAL laser, ion, emittance, dipole 783
 
  • C. Gabor
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  • G.E. Boorman, A. Bosco, S.M. Gibson
    Royal Holloway, University of London, Surrey, United Kingdom
  • G.E. Boorman, A. Bosco, S.M. Gibson
    JAI, Egham, Surrey, United Kingdom
  • A.P. Letchford
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • P. Savage
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • V.E. Scarpine
    Fermilab, Batavia, USA
  
  The Front End Test Stand at the Rutherford Appleton Laboratory (RAL) is being developed to demonstrate a chopped H− beam of 60 mA at 3 MeV with 10% duty cycle. Due to the high beam power it is advisable to use the technique of photo detachment to avoid intrusive methods. It is intended to apply this technique to perform emittance measurements at the output of the RFQ at full power. This requires a dedicated diagnostics dipole with a special-made vacuum chamber giving room for the different beam paths necessary to install a particle detector to measure the produced neutrals. Other aspects are the beam transport and influence of the dipole and its fringe field to the beam transport Other considerations are the installation of the laser, the optics and the particle detector itself.  
 
MOPWA050 Bunch Train Characterisation for an Infra-red FEL Driven by an Energy Recovery Linac FEL, electron, pick-up, EPICS 786
 
  • T.T. Thakker, D. Angal-Kalinin, D.J. Dunning, F. Jackson, S.P. Jamison, J.K. Jones, N. Thompson
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  The IR-FEL on the ALICE test facility in the UK first achieved lasing in October 2010 and has since been characterised in terms of its output *. In this work we make a characterisation of electron bunch properties along a complete 100us macropulse to characterise the lasing-induced energy change and its effect on energy recovery. Measurements of bunch energy and timing are correlated with the FEL radiation output and discussed.
* N. R. Thompson et al, ‘First lasing of the ALICE infra-red Free-Electron Laser’, Nuclear Instruments and Methods A, 680 (2012) 117–123 		 
 
MOPWA055 Status of Higher Order Mode Beam Position Monitors in 3.9 GHz Superconducting Accelerating Cavities at FLASH HOM, cavity, wakefield, dipole 798
 
  • P. Zhang, R.M. Jones, I.R.R. Shinton
    UMAN, Manchester, United Kingdom
  • N. Baboi, P. Zhang
    DESY, Hamburg, Germany
  • T. Flisgen, U. van Rienen
    Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock, Germany
  
  Funding: This work was partially funded by the European Commission under the FP7 Research Infrastructures grant agreement No.227579.
Higher order mode (HOM) beam position monitors (BPM) are being developed for the 3.9GHz third harmonic superconducting accelerating cavities at FLASH. The transverse beam position in a cavity can be determined utilizing beam-excited HOMs based on dipole components. The existing couplers used for HOM suppression provide the necessary signals. The diagnostics principle is similar to a cavity BPM, but requires no additional vacuum instruments on the linac. The challenges lie in the dense HOM spectrum arising from couplings of the majority HOMs amongst the four cavities in the cryo-module. HOMs with particularly promising diagnostics features were evaluated using various devices with various analysis methods. After careful theoretical and experimental assessment of HOMs, multi-cavity modes at ~5GHz were chosen to provide a global position over the complete module with superior resolution (~20μm) while trapped modes at ~9GHz provide local position in each cavity with comparable resolution (~50μm). A similar HOM-BPM system is planned for the European XFEL 3.9GHz module with 8 cavities. This paper reviews both the current status and the future prospects of HOM-BPMs in 3.9GHz cavities. 		 
 
MOPWA056 Spectra of Coherent Smith-Purcell Radiation Observed from Short Electron Bunches: Numerical and Experimental Studies electron, radiation, simulation, target 801
 
  • F. Bakkali Taheri, G. Doucas, I.V. Konoplev, A. Reichold
    JAI, Oxford, United Kingdom
  • H.L. Andrews
    LANL, Los Alamos, New Mexico, USA
  • R. Bartolini
    Diamond, Oxfordshire, United Kingdom
  • V. Bharadwaj, C.I. Clarke
    SLAC, Menlo Park, California, USA
  • N. Delerue
    LAL, Orsay, France
  • N. Fuster Martinez
    IFIC, Valencia, Spain
  • J.D.A. Smith
    TXUK, Warrington, United Kingdom
  • P. Stoltz
    Tech-X, Boulder, Colorado, USA
  
  Funding: This work performed [in part] under DOE Contract DE-AC02-7600515
There is a significant interest in the development of compact particle accelerators within research areas including X-ray and THz (T-ray) sources of radiation, particle physics and medical sciences. To support the progress in these areas, non-invasive, electron beam diagnostics that are capable of measuring a single femtosecond electron bunch are required. At the current stage such beam diagnostics for femtosecond-long electron bunches are still not available. The goal of the work presented is to understand the spectral characteristics of coherent Smith-Purcell radiation to enable its quick and reliable interpretation including the longitudinal profile reconstruction of electron bunches. The research presented comprises results from numerical modelling and experimental studies. Using the numerical data, we discuss the radiated spectra dependence on the electron bunch profile and analyse the results. We also discuss the experimental data and compare it with theoretical predictions. 		 
 
MOPWA060 DITANET - An International Network in Beam Diagnostics electron, photon, instrumentation, synchrotron 813
 
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  
  Funding: Work supported by the EU under contract 215080.
Beam diagnostics systems are essential constituents of any particle accelerator; they reveal the properties of a beam and how it behaves in a machine. Without an appropriate set of diagnostic elements, it would simply be impossible to operate any accelerator complex, let alone optimize its performance. Beam diagnostics is also a rich field in which a great variety of physical effects are made use of and consequently provides a wide interdisciplinary base for the training of researchers. The DITANET Consortium develops beyond state-of-the-art beam diagnostic techniques for hadron and electron accelerators and trained more than 20 researchers between 2008 and 2012. This contribution summarizes the network's research outcomes in beam instrumentation and diagnostics. 		 
 
MOPWA076 Improvements to Existing Jefferson Lab Wire Scanners emittance, optics, controls, linac 855
 
  • M.D. McCaughan, M.G. Tiefenback, D.L. Turner
    JLAB, Newport News, Virginia, USA
  
  This poster will detail the augmentation of selected existing CEBAF wire scanners with commercially available hardware, PMTs, and self created software in order to improve the scanners both in function and utility. Notice: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. The U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this manuscript for U.S. Government purposes.  
 
MOPWA087 Predictive Diagnostics for High-availability Accelerators monitoring, controls, klystron, extraction 873
 
  • K. Žagar, D. Bokal, K. Strniša
    Cosylab, Ljubljana, Slovenia
  • M. Gašperin
    University of West Bohemia, Pilsen, Czech Republic
  • L. Medeiros Romão, D. Vandeplassche
    SCK•CEN, Mol, Belgium
  • G. Pajor
    COBIK, Solkan, Slovenia
  
  In Accelerator Driven Systems, high availability of the accelerator is one of its key requirements. Fortunately, not every beam trip is necessarily a failure. For example, in the proposed MYRRHA transmuter, absence of the beam for less than 3 seconds is still deemed acceptable. Predictive diagnostics strives to predict where a failure is likely to occur, so that a mitigating action can be taken in a more controlled manner, thus preventing failure of other components while exactly pinpointing the component that is about to fail. One approach to predictive diagnostics is to analyze process variables that quantify inputs and outputs of components as archived by the accelerator's distributed control system. By observing trends in their values an impending fault can be predicted. In addition, sensors measuring e.g., vibration, temperature or noise can be attached to critical components. By analyzing the signatures of signals acquired by these sensors, non-nominal behavior can be detected which possibly indicates a looming failure.  
 
MOPWO039 Experience with High-intensity Beam Scraping and Tail Populations at the Large Hadon Collider beam-losses, emittance, injection, hadron 978
 
  • S. Redaelli, R. Bruce, F. Burkart, D. Mirarchi, B. Salvachua, G. Valentino, D. Wollmann
    CERN, Geneva, Switzerland
  • R.W. Aßmann
    DESY, Hamburg, Germany
  • G. Valentino
    University of Malta, Information and Communication Technology, Msida, Malta
  
  The population of beam tails at the LHC is source of concern because even small fractions of the total beam intensity could represent a potential danger is case of slow or fast losses, e.g. caused by orbit transients or by collimator movements. Different studies have been performed using the technique of collimator scans to probe the beam tail population, for different beam energies and beam intensities. The experience accumulated during the operation at 3.5 TeV and 4 TeV is reviewed and extrapolations to higher energies are considered.  
 
MOPWO068 Simulating Electron Cloud Evolution using Modulated Dielectric Models simulation, plasma, electron, proton 1043
 
  • S.A. Veitzer, P. Stoltz
    Tech-X, Boulder, Colorado, USA
  
  Funding: This work was performed under the auspices of the Department of Energy as part of the ComPASS SCiDAC-2 project (DE-FC02-07ER41499), and the SCiDAC-3 project (DE-SC0008920)
Electron clouds can pose a serious threat to accelerator performance, and understanding cloud buildup and the effectiveness of different mitigation techniques can provide cost-saving improvements in accelerator design and fabrication. Microwave diagnostics of electron clouds are a non-destructive way to measure cloud buildup, but it is very difficult to measure the cloud density from spectral signals alone. Modeling travelling-wave rf diagnostics is very hard because of the large range of spatial and temporal scales that must be resolved to simulate spectra. New numerical models have been used to generate synthetic spectra for electron clouds when the cloud density is not changing, and results have been compared to theoretical results. Here we use dielectric models to generate spectra for clouds that evolve over many bunch crossings. We first perform detailed simulations of cloud buildup using kinetic particle models, and then use an equivalent plasma dielectric model corresponding to this density, at a finer time resolution, to compute spectra. The stability and accuracy of dielectric models that spectra can be accurately determined in these very long timescale simulations. 		 
 
TUOCB201 Recent Developments of Novel Beam Diagnostics at the ESRF electron, dipole, vacuum, injection 1143
 
  • K.B. Scheidt
    ESRF, Grenoble, France
  
  A number of rather novel and particular electron beam diagnostics have seen their development in 2012 for the ESRF Storage Ring. A vertical Beam Halo detector that measures the bunch population at millimetres, i.e. hundreds of σs of nominal beam size, away from the central core. This measurement is based on X-ray synchrotron radiation from a bending magnet and is totally non-destructive to the electron beam itself. Another diagnostic use of the very hard X-rays available from the bending magnets is the detection of electron beam energy fluctuations. The detector hardware is simple and in-expensive and has shown a resolution of energy fluctuations of less than 10ppm. Also a single orbit turn measurement of the injected beam shape and size is now possible through the use of visible synchrotron light combined with a fast gateable intensifier, which can be triggered on any of the desired orbit turns after injection. Detailed results of each of these new diagnostics will be presented.  
slides icon Slides TUOCB201 [1.511 MB]  
 
TUPEA059 CLARA Accelerator Design and Simulations linac, FEL, laser, emittance 1268
 
  • P.H. Williams, D. Angal-Kalinin, J.K. Jones, B.P.M. Liggins, J.W. McKenzie, B.L. Militsyn
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • D. Angal-Kalinin, J.K. Jones, B.P.M. Liggins, J.W. McKenzie, P.H. Williams
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  
  Funding: Science & Technology Facilities Council
We present the accelerator design for CLARA (Compact Linear Advanced Research Accelerator) at Daresbury Laboratory. CLARA will be a testbed for novel FEL configurations. The accelerator will consist of an RF photoinjector, S-band acceleration and transport to 250 MeV including X-band linearisation and magnetic bunch compression. We describe the transport in detail including dedicated diagnostic sections. Beam dynamics simulations are then used to define a set of operating working points suitable for the different FEL schemes intended to be tested on CLARA. 		 
 
TUPWA059 End-to-end Beam Simulations for the C-ADS Injector II proton, linac, rfq, simulation 1838
 
  • X. Wu, E. Tanke, Q. Zhao
    FRIB, East Lansing, Michigan, USA
  • Y. He, H. Jia, Z.J. Wang, H.W. Zhao
    IMP, Lanzhou, People's Republic of China
  
  The Injector II for the proposed Chinese Accelerator Driven System (C-ADS) is designed to accelerate proton beam to ~ 10 MeV with beam current up to ~ 10 mA. The accelerator system will include a proton ECR ion source, a Low Energy Beam Transport System (LEBT), a room-temperature radio frequency quadrupole (RFQ), a Medium Energy Beam Transport System (MEBT), a Superconducting (SC) linac and a High Energy Beam Transport System (HEBT). Both RFQ and the SC linac will have a base frequency of 162.5 MHz. The accelerating cryomodules in the SC linac uses SC half-wave cavities for acceleration and SC solenoids with dipole correctors for transverse focusing and central orbit correction. End-to-end beam simulations starting with a realistic initial input beam from the ECR ion source were performed using DYNAC and IMPACT codes to evaluate the C-ADS Injector II accelerator system performance, code benchmarking with TRACK and explore system design options for future optimizations. The results of these beam dynamics studies will be presented in the paper.  
 
WEOBB201 Commissioning of the X-band Transverse Deflector for Femtosecond Electron/X-Ray pulse Length Measurements at LCLS FEL, undulator, electron, klystron 2091
 
  • Y.T. Ding, C. Behrens, J.C. Frisch, Z. Huang, P. Krejcik, J.R. Lewandowski, H. Loos, J.W. Wang, M.-H. Wang, J.J. Welch
    SLAC, Menlo Park, California, USA
  • C. Behrens
    DESY, Hamburg, Germany
  
  X-ray free-electron lasers provide ultrashort x-ray pulses from several to a few hundred femtoseconds for multidisciplinary users. However, tremendous challenges remain in the measurement and control of these ultrashort pulses with femtosecond precision, for both the electron beam and the x-ray pulses. A new diagnostic scheme adding a transverse radio-frequency deflector at the end of the linac coherent light source (LCLS) undulator beamline has been proposed*. Two 1-m long deflecting structures have been installed at LCLS during the summer of 2012. Installation of the high power RF components including the klystron, waveguide, RF controls etc. is proceeding and commissioning is scheduled for March 2013. We report the latest progress of the commissioning of the deflector at LCLS.
* Y. Ding et al., Phys. Rev. ST Accel. Beams 14, 120701 (2011) 		 
slides icon Slides WEOBB201 [4.199 MB]  
 
WEPWA072 Design and Commissioning of Chasman-­Green Double Bend Achromatic Lattice Linear Transport Line at the University of Hawai'i MkV Accelerator Facility dipole, quadrupole, electron, focusing 2280
 
  • B.T. Jacobson, J. Madey, P. Niknejadi
    University of Hawaii, Honolulu, HI, USA
  
  The design of the Double Bend Achromat (DBA) lattice was originally motivated by the desire to increase the brightness of a synchrotron ring by storing a low emittance electron beam*. Alternating the direction of the bends in the DBA lattice turns the ring into a linear transport line, which has advantages over the straight transport lines typically used in linac FEL's. The dipoles in the DBA cells provide synchrotron images of the electron beam, a real-time non-destructive diagnostic during operation. As in circular machines, sections between DBA cells provide a low-emittance dispersion free beam for insertion devices such as FEL's and inverse Compton backscattering sources. This paper describes an example linear DBA, which has been designed and commissioned as part of the MkV 40 MeV electron accelerator facility at the University of Hawaii.
* Renate Chasman and G. Kenneth Green "Preliminary Design of a Dedicated Synchrotron Radiation Facility", IEEE Transactions on Nuclear Science, NS­22(3):1765-­1767, June 1975 		 
 
WEPWA077 Aperture Test for Internal Target Operation in the JLAB High-current ERL FEL, target, electron, radiation 2289
 
  • S. Zhang, S.V. Benson, G.H. Biallas, K. Blackburn, J.R. Boyce, D.B. Bullard, J.L. Coleman, J. Delk, D. Douglas, P. Evtushenko, C.W. Gould, J.G. Gubeli, F.E. Hannon, D. Hardy, C. Hernandez-Garcia, K. Jordan, J.M. Klopf, R.A. Legg, M. Marchlik, W. Moore, G. Neil, J. Powers, T. Powers, D.W. Sexton, M.D. Shinn, C. Tennant, R.L. Walker, G.P. Williams, F.G. Wilson
    JLAB, Newport News, Virginia, USA
  • J. Balewski, J. Bernauer, W. Bertozzi, R.F. Cowan, P.F. Fisher, E. Ihloff, A. Kelleher, R. Milner, L. Ou, B.A. Schmookler, c. Tschalär
    MIT, Cambridge, Massachusetts, USA
  • N. Kalantarians
    Hampton University, Hampton, Virginia, USA
  
  Funding: Supported by the Commonwealth of Virginia, U.S. DOE Nuclear and High Energy Physics, and by the U.S. DOE Basic Energy Sciences under contract No. DE-AC05-060R23177.
A high current beam transmission test has been successfully completed at the JLAB FEL Facility, culminating in very low-loss transmission of a high current CW beam through a small aperture. The purpose of this test was to determine if an ERL is capable of meeting the stringent requirements imposed by the use of a 1018/cm3 internal gas target proposed for the DarkLight experiment*. Minimal beamline modifications were made to create a machine configuration that is substantially different from those used in routine UV or IR FEL operation. A sustained (8 hour) high power beam run was performed, with clean transmission through a 2 mm transverse aperture of 127 mm length simulating the target configuration. A beam size of 50 um (rms) was measured near the center of the aperture. Experimental data from a week-long test run consistently exhibited beam loss of only a few ppm on the aperture while running 4.5 mA current at 100 MeV – or nearly 0.5 MW beam power. This surpassed the users’ expectation and demonstrated a unique capability of an ERL for this type of experiments. This report presents a summary of the experiment, a brief overview of our activities, and outlines future plans.
References:
* P. Fisher, et al.,“Jlab PR-11-008: A Proposal for the DarkLight Experiment at the Jefferson Laboratory Free Electron Laser.” http://www.jlab.org/expprog/proposals/11prop.html 		 
 
WEPWO012 XFEL 3.9 GHz Prototype Cavities Tests cavity, HOM, pick-up, status 2337
 
  • P. Pierini, M. Bertucci, A. Bosotti, C. Maiano, 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
  
  In preparation for the XFEL components production, three prototype cavities have been manufactured and vertically tested at INFN-LASA. Several tests, with and without HOM antennas and in a double cavity test configuration, have been performed. Further tests of one of the prototypes took place at FNAL, to validate results between the two test facilities. Results were consistent with those obtained at INFN-LASA.  
 
WEPFI066 The RF System for the MICE Experiment cavity, controls, LLRF, linac 2848
 
  • K. Ronald, A.J. Dick, C.G. Whyte
    USTRAT/SUPA, Glasgow, United Kingdom
  • P.A. Corlett
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • A.J. DeMello, D. Li, S.P. Virostek
    LBNL, Berkeley, California, USA
  • A.F. Grant, A.J. Moss, C.J. White
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • P.M. Hanlet
    IIT, Chicago, Illinois, USA
  • C. Hunt, K.R. Long, J. Pasternak
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • T.H. Luo, D.J. Summers
    UMiss, University, Mississippi, USA
  • A. Moretti, R.J. Pasquinelli, D.W. Peterson, R.P. Schultz, J.T. Volk
    Fermilab, Batavia, USA
  • P.J. Smith
    Sheffield University, Sheffield, United Kingdom
  • T. Stanley
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  • Y. Torun
    Illinois Institute of Technology, Chicago, IL, USA
  
  The International Muon Ionisation Cooling Experiment (MICE) is designed to demonstrate the effectiveness of ionisation cooling to reduce the phase space footprint of a muon beam, principally to allow the subsequent acceleration of muons for next generation colliders and/or neutrino factories. The experiment (and indeed any subsequent accelerator cooling channel based on the same principles) poses certain unusual requirements on its RF system, whilst the precision measurement of the ionisation cooling process demands special diagnostics. This paper shall outline the key features of the RF system, including the LLRF control, the power amplifier chain, distribution network, cavities, tuners and couplers, all of which must operate in a high magnetic field environment. The RF diagnostics which, in conjunction with the other MICE diagnostics, shall allow detailed knowledge of the amplitude and phase of the acceleration field during the transit of each individual Muon shall also be outlined.  
 
WEPFI074 RF Cavity Spark Localization Using Acoustic Measurement cavity, background, LabView, collider 2863
 
  • P. Snopok
    IIT, Chicago, Illinois, USA
  • A.D. Bross
    Fermilab, Batavia, USA
  • P.G. Lane, Y. Torun
    Illinois Institute of Technology, Chicago, Illinois, USA
  
  Current designs for muon cooling channels require high-gradient RF cavities to be placed in solenoidal magnetic fields in order to contain muons with large transverse emittances. It has been found that doing so reduces the threshold at which RF cavity breakdown occurs. To aid the effort to study RF cavity breakdown in magnetic fields it would be helpful to have a diagnostic tool which can detect breakdown and localize the source of the breakdown inside the cavity. We report here on progress towards developing a diagnostic tool for detecting and localizing sparks in an RF cavity by using piezoelectric transducers.  
 
WEPME062 Short-Pulse Ti:Sapphire Laser System for Photocathode Research at SLAC laser, gun, cavity, cathode 3076
 
  • W.J. Corbett, A. Brachmann, R.N. Coffee, A.R. Fry, S. Gilevich, N. Hartmann, W. Helml, P. Hering, E.N. Jongewaard, D. Kelley, J.R. Lewandowski, W. Polzin, J. Sheppard, P. Stefan, T. Vecchione, S.P. Weathersby, W.E. White, M. Woods, F. Zhou
    SLAC, Menlo Park, California, USA
  
  A photo-cathode research laboratory has been constructed at SLAC to test and characterize the spare LCLS electron gun. At the heart of the laboratory is a dual-purpose Ti:Sapphire oscillator/regen laser that can deliver either a 2.5ps, 760nm beam to the photocathode gun or a 35fs, 800nm beam to prototype diagnostics for the LCLS. The objective of the photocathode research is to definitively identify ‘recipes’ for high-reliability cathode processing resulting in high quantum efficiency and low beam emittance. The LCLS diagnostics program is presently aimed at developing spectral-encoding systems for shot-by-shot pulse arrival time measurements at the 10fs level. In this paper we review the Ti:Sapphire laser system and report on status of the photocathode and diagnostics programs.  
 
THOAB102 A Pepper-pot Based Device for Diagnostics of the Single-shot Beam ion, emittance, LabView, vacuum 3093
 
  • S.X. Peng, J. Chen, J.E. Chen, Z.Y. Guo, P.N. Lu, H.T. Ren, Z.H. Wang, Y. Xu, Z.X. Yuan, T. Zhang, J. Zhao
    PKU, Beijing, People's Republic of China
  • A.L. Zhang
    Graduate University, Chinese Academy of Sciences, Beijing, People's Republic of China
  • J. Zhao
    State Key Laboratory of Nuclear Physics and Technology, Beijing, Haidian District, People's Republic of China
  
  Generally the beam emittance can be measured by different Emittance Measurement Units (EMUs), such as the pepper-pot device, the slit-wire type facility and the Allison scanner. However, for a microsecond single-shot ion beam, the pepper-pot device is a suitable choice because of its cut-off single-shot technique without any time-consuming step. A pepper-pot based beam current & profile measurement device, which is a combination of Faraday cup technique and pepper-pot measurement facility, was developed at PKU. It consists of a main Faraday cup with a pepper-pot mask at its bottom, and a Faraday cup array locating 3 mm away from the pepper-pot mask. This device has been tested at the PKU LEBT test bench and the measurement results are consistent with the results acquired by the Allison scanner. By replacing the Faraday cup array with a fluorescent screen and a CCD camera, this device becomes a facility that not only has the ability to measure the total beam current and the beam profile, but also has the capability to measure the beam emittance for CW or pulsed ion beams. Details will be presented in this paper.  
slides icon Slides THOAB102 [5.332 MB]  
 
THPEA002 The Accelerator Control System at ELSA controls, electron, synchrotron, emittance 3149
 
  • D. Proft, F. Frommberger, W. Hillert
    ELSA, Bonn, Germany
  
  To fulfill the new requirements of the post-accelerator mode of the electron stretcher facility ELSA, a new computer control system was developed during the early 1990s. Providing capabilities to control and monitor the facility, it represents the top layer of a distributed control system composed of HP workstations, VME and field bus processors as well as linux based personal computer s. In addition to regular updates and improvements, the HP-UX operated part of the control system recently was ported to linux, so the outdated HP workstations could be replaced by a single linux PC. All reference values, for example the betatron tune or the extraction energy, can be specified using a window-based graphical user front end. They are directly computed to hardware compatible representations. Vice versa, measured beam parameters, e.g. the transversal beam emittance, are displayed for easy user access, allowing real time diagnostics. This abstraction layer allows for an intuitive approach to machine operation, requiring no detailed knowledge of the hardware implementation. In this contribution, the design principles and implementation at different layers of the control system are presented.  
 
THPEA063 NSLS II Injector Integrated Testing controls, target, booster, linac 3285
 
  • G.M. Wang, B. Bacha, A. Blednykh, E.B. Blum, W.X. Cheng, J. Choi, L.R. Dalesio, M.A. Davidsaver, J.H. De Long, R.P. Fliller, W. Guo, K. Ha, H.-C. Hseuh, Y. Hu, W. Louie, M.A. Maggipinto, D. Padrazo, T.V. Shaftan, G. Shen, O. Singh, Y. Tian, K. Vetter, F.J. Willeke, H. Xu, L. Yang, X. Yang
    BNL, Upton, Long Island, New York, USA
  • P.B. Cheblakov, A.A. Derbenev, A.I. Erokhin, S.M. Gurov, R.A. Kadyrov, S.E. Karnaev, E.A. Simonov, S.V. Sinyatkin, V. Smalyuk
    BINP SB RAS, Novosibirsk, Russia
  
  The NSLS-II is a state of the art 3 GeV synchrotron light source under construction at Brookhaven National Laboratory. Since 2012, the injector system gradually moves to the commissioning stage. It occurs after group people efforts on optics design, equipment specifications, construction and tests, assembly, installation and alignment. It is very important and exciting. To make the commissioning smooth and efficient, an important effort was put on the sub-system integration test to make sure the device function along with utility, timing system and control system, to calibrate diagnostics system and to debug high level application with simulated beam signals and required hardware. In this paper, we report our integration test experience and related control system software development.  
 
THPFI012 Design of the cERL Vacuum System vacuum, linac, electron, gun 3315
 
  • Y. Tanimoto, S. Asaoka, T. Honda, T. Nogami, T. Obina, R. Takai
    KEK, Ibaraki, Japan
  
  The compact Energy Recovery Linac (cERL) is being constructed as a test accelerator for the ERL-based future light source at KEK. In the design of the cERL, electron beams with low normalized emittance (0.1 mm·mrad) and high average current (10 mA) are generated at a 500-kV gun, and accelerated up to 125 MeV at superconducting (SC) cavities that make energy recovery. The vacuum system should accommodate such high intensity, ultrashort bunch (0.1 ~ 3 ps) electron beams, and be designed so as to minimize its loss factor. Therefore, low impedance vacuum components, such as zero-gap flanges and rf-shielded screen monitors, have been developed. Extra high and clean vacuum is required in the vicinity of the SC cavities to maintain their high gradient operation, and those beam tubes are coated by Non-Evaporable Getter (NEG) films. Because of the low beam energy, photon absorbers are not necessary and the beam tubes can be made of stainless steel. However, the photon scrubbing effect is so limited that the beam tubes should be ready for in-situ bakeout and are wrapped with thin Kapton heaters, which are also useful for the NEG-coating activation.  
 
THPWA004 The HIT Gantry: From Commissioning to Operation ion, proton, dipole, optics 3636
 
  • M. Galonska, S. Brons, R. Cee, Th. Haberer, K. Höppner, J.M. Mosthaf, A. Peters, S. Scheloske, T. Winkelmann
    HIT, Heidelberg, Germany
  
  The patient treatment at the first 360° raster scanning heavy ion gantry of the Heidelberg Ion Therapy Facility (HIT) started in October 2012 using proton and carbon ion beams. HIT is the first dedicated proton and carbon cancer therapy facility in Europe. It uses full 3D intensity controlled raster scanning dose delivering method of pencil beams. The ion energy ranges from ~50 up to 430 MeV/u (ion penetration depths of 20 to 300 mm in water). Beams are provided by a linac-synchrotron-system to four high energy beam lines: 2 horizontal patient treatment rooms; 1 horizontal experimental cave for quality assurance, development, and research work; and the heavy ion gantry. From the first commissioning the libraries of carbon and proton pencil beams at the gantry had been offered with the whole variety of ion beam properties: 255 energy steps, 4 beam foci, 360°, and 10 intensities (106-1010/spill) regarding the central beam. This paper reflects the impact of the subsequent preclinical testing including beam size/position, and dose measurements within the irradiation field of 20x20 cm2 on the further improvement of the ion optical settings of the gantry high energy transfer line.  
 
THPWA036 Implementation and Commissioning of the New Electron Beam Test Facility (EBTF) at Daresbury Laboratory for Industrial Accelerator System gun, electron, laser, cathode 3708
 
  • P.A. McIntosh, D. Angal-Kalinin, R.K. Buckley, S.R. Buckley, J.A. Clarke, B.D. Fell, A.R. Goulden, C. Hill, F. Jackson, S.P. Jamison, J.K. Jones, A. Kalinin, B.P.M. Liggins, J.W. McKenzie, K.J. Middleman, B.L. Militsyn, T.C.Q. Noakes, Y.M. Saveliev, B.J.A. Shepherd, S.L. Smith, T.T. Thakker, A.E. Wheelhouse
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • N. Bliss, G. Cox, G.P. Diakun, A. Gleeson, L. Ma, B.G. Martlew, A.J. Moss, K. Robertson, M.D. Roper, R.J. Smith
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  
  The EBTF facility will provide enabling infrastructures targeted at the development and testing of novel and compact accelerator technologies, specifically through partnership with industry and aimed at addressing applications in medicine, health, security, energy and industrial processing. The facility has now been implemented at Daresbury Laboratory and the commissioning of the critical accelerator systems has been performed. The facility is now preparing for first exploitation with partnering industries that will be able to utilise the electron beam parameters available on EBTF to either demonstrate new techniques and/or processes or otherwise develop new technologies for future commercial realisation.  
 
THPWA045 Accelerator R&D in the QUASAR Group antiproton, storage-ring, electron, ion 3732
 
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  
  Funding: Work supported by the STFC Cockcroft Institute Core Grant No. ST/G008248/1, HGF and GSI under contract VH-NG-328 and the EU under contracts 215080, 289181 and 289485.
The QUASAR Group is a pan-European research group based at the Cockcroft Institute in the UK. It carries out R&D into methods to decelerate and store very low energy antiproton and exotic ion beams, beam diagnostics developments for medical accelerators, including imaging and dosimetry, as well as opto-electronics and laser applications. This contribution presents the latest results of the Group's studies into the USR/ELENA/AEgIS antimatter facilities, novel least destructive beam profile monitors for medical and industry applications, as well as laser applications for accelerators, includingμaccelerators and a laser velocimeter. 		 
 
THPWO003 Final Design of the IFMIF Injector at CEA/Saclay extraction, rfq, simulation, solenoid 3758
 
  • R. Gobin, D. Bogard, N. Chauvin, O. Delferrière, P. Girardot, F. Harrault, J.L. Jannin, D. Loiseau, C. Marolles, P. Mattei, A. Roger, F. Senée, O. Tuske
    CEA/DSM/IRFU, France
  • H. Shidara
    IFMIF/EVEDA, Rokkasho, Japan
  
  The IFMIF accelerator dedicated to high neutron flux production for material studies is now entering in a new phase. For this irradiation tool, IRFU institute from CEA/Saclay is in charge of the design, construction and characterization of the Injector. The high intensity deuteron beam is produced by an ECR source located on a 100 kV platform. The 2 m long LEBT, based on 2 solenoids, is ended by a cone installed at the entrance of the RFQ. Specific diagnostics (cameras, Allison type emittance scanner, fiberscope) have been installed for the beam characterization. During the last weeks, after Injector conditioning, more than 100 mA of deuteron beams have been characterized after the RFQ entrance cone in pulsed and continuous mode*. The shipment of the Injector towards the Rokkasho site in Japan (where it will be reinstalled) is foreseen at the beginning of 2013. This paper will focus on the final design used during the beam characterization experiments at Saclay.
* N. Chauvin et al. this conference 		 
 
THPWO045 Commissioning Plan for the CSNS Linac DTL, linac, emittance, quadrupole 3869
 
  • J. Peng, S. Fu, J. Li, Y. Li, H.C. Liu, H.F. Ouyang, N. Wang, S. Wang, T.G. Xu
    IHEP, Beijing, People's Republic of China
  
  The linac of the China Spallation Neutron Source(CSNS) will be commissioned from October 2013. The linac will be commissioned in three phases. The delivery of beam to the RCS is planned for October 2015. This paper describes the commissioning plans for the MEBT and DTL parts of the linac. Techniques for finding the RF set-point, matching and steering are presented, as well as codes to assist in the beam commissioning.  
 
THPWO082 Commissioning of the Linac4 RFQ at the 3 MeV Test Stand rfq, linac, solenoid, emittance 3951
 
  • C. Rossi, L. Arnaudon, G. Bellodi, J.C. Broere, O. Brunner, A.M. Lombardi, J. Marques Balula, P. Martinez Yanez, J. Noirjean, C. Pasquino, U. Raich, F. Roncarolo, M. Vretenar
    CERN, Geneva, Switzerland
  • M. Desmons, A. France, O. Piquet
    CEA/IRFU, Gif-sur-Yvette, France
  
  Linac4, the future 160MeV H− injector to the CERN Proton Synchrotron Booster, is presently under construction at CERN as a first step of the planned upgrade of the LHC injectors. The low energy section of LINAC4, consisting of an ion source, a 352.2 MHz Radio Frequency Quadrupole (RFQ) and a chopper line is being commissioned in a dedicated test stand before installation in its final position in the tunnel. The RFQ is designed to accelerate a 45 keV, 70 mA, H− beam to 3 MeV, with an efficiency of 95% while preserving the transverse emittance. The RFQ, a four-vane structure 3 m in length, has been designed in collaboration with CEA/IRFU and it has been built at the CERN workshop. The precise fabrication has allowed to achieve a field flatness of 1%. The completion of the accelerating structure in September 2012 was followed by a complete series of bead-pull measurements and by high-power conditioning to the nominal power of 0.39 MW corresponding to a voltage of 78 kV across the 3 meters. Measurements with beam are foreseen during the first half of 2013. This paper reports the results of the low-power and high power RF commissioning as well as the status of beam measurements.  
 
THPWO090 MEBT Design for the Front End Test Stand Project at RAL quadrupole, cavity, lattice, emittance 3969
 
  • M. Aslaninejad, J.K. Pozimski, P. Savage
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  
  The Front End Test Stand (FETS) linear accelerator at Rutherford Appleton laboratory (RAL) will accelerate a 60 mA, 2 ms, 50 pps H− beam up to 3 MeV. A new lattice design for the Medium Energy Beam Transport (MEBT) with a fast-slow chopping system is presented. Beam dynamic simulation has shown very good particle transmission in this new lattice with space charge effects included. The beam energy distribution on the beam choppers dumps is also calculated.