Keyword: controls
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MOPSO82 JLIFE: The Jefferson Lab Interactive Front End for the Optical Propagation Code laser, FEL, GUI, factory 149
 
  • A.M. Watson, M.D. Shinn
    JLAB, Newport News, Virginia, USA
 
  Funding: Authored by Jefferson Science Associates, LLC and supported by the ONR, the Joint Technology Office, and the DOE under U.S. DOE Contract No. DE-AC05-06OR23177.
We present details on a graphical interface for the open source software program Optical Propagation Code, or OPC. [1] This interface, written in Java, allows a user with no knowledge of OPC to create an optical system, with lenses, mirrors, apertures, etc. and the appropriate drifts between them. The Java code creates the appropriate Perl script that serves as the input for OPC. The mode profile is then output at each optical element. The display can be either an intensity profile along the x axis, or as an isometric 3D plot which can be tilted and rotated. These profiles can be saved. Examples of the input and output will be presented.
[1] J. G. Karssenberg, P. J. M. van der Slot, I. V. Volokhine, J. W. J. Verschuur, and K.-J. Boller, “Modeling paraxial wave propagation in free-electron laser oscillators”, JAP 100, 093106 (2006).
 
 
TUPSO12 RF Design Approach for an NGLS Linac cavity, linac, cryomodule, cryogenics 226
 
  • A. Ratti, J.M. Byrd, J.N. Corlett, L.R. Doolittle, P. Emma, M. Venturini, R.P. Wells
    LBNL, Berkeley, California, USA
  • C. Adolphsen, C.D. Nantista
    SLAC, Menlo Park, California, USA
  • D. Arenius, S.V. Benson, D. Douglas, A. Hutton, G. Neil, W. Oren, G.P. Williams
    JLAB, Newport News, Virginia, USA
  • C.M. Ginsburg, R.D. Kephart, T.J. Peterson, A.I. Sukhanov
    Fermilab, Batavia, USA
 
  Funding: Work supported by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
The Next Generation Light Source (NGLS) is a design concept for a multibeamline soft x-ray FEL array powered by a ~2.4 GeV CW superconducting linear accelerator, operating with a 1 MHz bunch repetition rate. This paper describes the concepts for the cavity and cryostat design operating at 1.3 GHZ and based on minimal modifications to the design of ILC cryomodules, This leverages the extensive experience derived from R&D that resulted in the ILC design. Due to the different nature of the two applications, particular attention is given now to high loaded Q operation and microphonics control, as well as high reliability and expected up time. The work describes the design and configuration of the linac, including choice of gradient, possible modes of operation, cavity design and RF power, as well as the consequent requirements for the cryogenic system.
 
 
TUPSO13 Superconducting Linac Design Concepts for a Next Generation Light Source at LBNL cavity, cryomodule, linac, HOM 229
 
  • J.N. Corlett, J.M. Byrd, L.R. Doolittle, P. Emma, A. Ratti, F. Sannibale, M. Venturini, R.P. Wells, S. Zimmermann
    LBNL, Berkeley, California, USA
  • C. Adolphsen, C.D. Nantista
    SLAC, Menlo Park, California, USA
  • D. Arenius, G. Neil, T. Powers, J.P. Preble
    JLAB, Newport News, Virginia, USA
  • C.M. Ginsburg, R.D. Kephart, A.L. Klebaner, T.J. Peterson, A.I. Sukhanov
    Fermilab, Batavia, USA
 
  Funding: Work supported by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
The NGLS collaboration is developing design concepts for a multi-beamline soft X-ray FEL array powered by a superconducting linear accelerator, operating in CW mode, with a high bunch repetition rate of approximately 1 MHz. The superconducting linear accelerator design concept is based on existing TESLA and ILC technology, developed for this CW application in a light source. In this paper we describe design options and preferred approaches for the NGLS SRF linac components, cryomodules, and cryosystems.
 
 
TUPSO19 The Photocathode Laser System for the APEX High Repetition Rate Photoinjector laser, cathode, electron, feedback 255
 
  • D. Filippetto, L.R. Doolittle, G. Huang, G. Marcus, H.J. Qian, F. Sannibale
    LBNL, Berkeley, California, USA
 
  Funding: DOE grants No. DE-AC02-05CH11231.
The APEX injector has been built and commissioned at LBNL. A CW-RF Gun accelerates electron bunches to up 750 keV at MHz repetition rate. Different high efficiency photocathodes with different work functions are being tested with the help of a load lock system. The photocathode drive laser is thus conceived to provide up to 40 nJ per pulse in the UV and 200 nJ per pulse in the green at 1 MHz, with transverse and longitudinal shaping (flat top, up to 60 ps) for electron beam creation. A transfer line of about 15 meters has been designed and optimized for minimal jitters. Remote control of repetition rate, energy and position have been implemented on the system, together with offline and online diagnostic for beam monitoring. Here we present the laser system setup as well as the first measurements on longitudinal pulse shaping and jitter characterization.
 
 
TUPSO43 Status of the SwissFEL C-band Linear Accelerator linac, klystron, low-level-rf, vacuum 317
 
  • F. Löhl, J. Alex, H. Blumer, M. Bopp, H.-H. Braun, A. Citterio, H. Fitze, H. Jöhri, T. Kleeb, L. Paly, J.-Y. Raguin, L. Schulz, R. Zennaro
    PSI, Villigen PSI, Switzerland
  • U. Ellenberger
    Paul Scherrer Institute, Villigen PSI, Switzerland
 
  This paper will summarize the status of the linear accelerator of the Swiss free-electron laser SwissFEL. It will be based on C-band technology and will use solid-state modulators and a novel type of C-band accelerating structures which has been designed at PSI. Initial test results of first 2 m long structures will be presented together with measurements performed with the first BOC-type pulse compressors. Furthermore, we will present first results of a water cooling system for the accelerating structures and the pulse compressors.  
 
TUPSO60 Status of the Undulator Systems for the European X-ray Free Electron Laser undulator, laser, electron, FEL 367
 
  • J. Pflüger, M. Bagha-Shanjani, A. Beckmann, K.H. Berndgen, P. Biermordt, G. Deron, U. Englisch, S. Karabekyan, B. Ketenoğlu, M. Knoll, Y. Li, F. Wolff-Fabris, M. Yakopov
    XFEL. EU, Hamburg, Germany
 
  The three undulator systems for the European XFEL consist of a total of 91 Undulator Cells. Each cell consists of an Undulator Segment and an intersection. They will be operational by end of 2015. The serial production of the 91 Undulator Segments is a great challenge and without precedence. It is now in full swing. This contribution gives an overview over the most important design aspects as well as the experience and strategy with the serial production. Representative results of magnetic performance are given. The status of the other system components is briefly described.  
 
TUPSO87 High-Field Laser-Based Terahertz Source for SwissFEL laser, radiation, photon, FEL 438
 
  • C. Vicario, C.P. Hauri, B. Monoszlai, C. Ruchert
    PSI, Villigen PSI, Switzerland
  • C.P. Hauri
    EPFL, Lausanne, Switzerland
 
  We present efficient laser-driven THz generation by optical rectification in various organic materials yielding transient fields up to 150 MV/m and 0.5 Tesla. The generated spectra extend over the entire THz gap (0.1-10 THz). Manipulation of the absolute phase by dispersion control is demonstrated for 5-octave spanning, single-cycle pulses. The presented source will be applied to the future SwissFEL as Xray photon temporal diagnostics and for pump-and-probe experiments.  
 
WEPSO30 Integrating the FHI-FEL Into the FHI Research Environment - Design and Implementation Aspects FEL, cavity, EPICS, ion 562
 
  • H. Junkes, W. Erlebach, S. Gewinner, U. Hoppe, A. Liedke, G. Meijer, W. Schöllkopf, M. Wesemann, G. von Helden
    FHI, Berlin, Germany
  • H. Bluem, D. Dowell, R. Lange, A.M.M. Todd, L.M. Young
    AES, Princeton, New Jersey, USA
  • S.B. Webb
    ORNL, Oak Ridge, Tennessee, USA
 
  The new mid-infrared FEL at the Fritz-Haber-Institut (FHI) was presented at the FEL12 conference*. It will be used for spectroscopic investigations of molecules, clusters, nanoparticles and surfaces. This facility must be easy to use by the scientists at FHI, and should be seamlessly integrated into the existing research environment. The Experimental Physics and Industrial Control System (EPICS) software framework was chosen to build the FHI-FEL control system, and will also be used to interface the user systems. The graphical operator interface is based on the Control System Studio (CSS) package. It covers radiation safety monitoring as well as controlling the complete set of building automation and utility devices, regardless of their particular function. A user interface (subset of the operator interface) allows user-provided experiment-control software (KouDa, LabVIEW, Matlab) to connect with an EPICS Gateway providing secured access. The EPICS Channel Archiver continuously records selected process variable data and provides a web server offering archive and near real-time data. A sample experiment installation demonstrates how this user interface can be used efficiently.
* W. Schöllkopf et al., FIRST LASING OF THE IR FEL AT THE FRITZ-HABER-INSTITUT, BERLIN, Conference FEL12
 
 
WEPSO65 LEBRA Free Electron Laser as a Radiation Source for Photochemical Reactions in Living Organisms FEL, radiation, electron, laser 675
 
  • F. Shishikura, K. Hayakawa, Y. Hayakawa, M. Inagaki, K. Nakao, K. Nogami, T. Sakai, T. Tanaka
    LEBRA, Funabashi, Japan
 
  The radiation sources commonly used in plant applications are commercially available lamps developed for human lighting applications (fluorescent, metal halide, high-pressure sodium, incandescent, light-emitting diode, and laser diode). In contrast, free-electron lasers (FELs) such as LEBRA-FEL produce high-energy, tunable pulse radiation and thus are promising radiation sources for photochemical research. An advantage of LEBRA-FEL is that the peak intensity ranges from 0.35 to 6.5 microns which are wavelengths coinciding with the absorption peaks of living organisms. Previously, we established a microscopic irradiation technique for delivering visible FEL light to single cells through a tapered glass rod (< 10 microns). However, it is still unclear whether LEBRA-FEL can produce sufficient radiant energy at wavelengths effective for triggering photochemical reactions in living organisms. The aim of this study was to evaluate the effectiveness of LEBRA-FEL in lettuce-seed germination tests. Results show promotion by red light and inhibition by far-red light, indicating that LEBRA-FEL can be used to control lettuce-seed germination.  
 
WEPSO73 High Average Power Seed Laser Design for High Reprate FELs laser, FEL, electron, vacuum 697
 
  • R.B. Wilcox, G. Marcus, G. Penn
    LBNL, Berkeley, California, USA
  • T. Metzger, M. Schultze
    TRUMPF Scientific Lasers GmbH + Co. KG, Munchen-Unterfoehring, Germany
 
  Funding: US Department of Energy, under Contract Numbers DE-AC02-0SCH11231.
In the proposed Next Generation Light Source (NGLS), FEL designs use lasers to seed the FEL in an HGHG scheme or bunch the electron beam in an E-SASE scheme. The FELs would run at 100kHz to 1MHz, requiring high average power lasers. For the seeded FEL, laser modulation is applied at 200-240nm, with 250-700MW peak power depending on pulse length, which can vary from 100-10fs. The laser consists of a broadband oscillator and amplitude/phase shaper seeding an optical parametric amplifier (OPA). After recompression, the ~800nm pulse is converted to the fourth harmonic. Losses could be high enough to require 250W at 100kHz, making the OPA ~100x more powerful than existing femtosecond OPAs. In the E-SASE scheme, a single cycle of 5 micron light bunches the beam, which then radiates a short X-ray burst. This requires 100% fractional bandwidth, and precise phase control of the e-field within the pulse, as well as broad band compensation of dispersion throughout the laser path. Bandwidth can be increased by splitting the amplified spectrum into segments and coherently recombining. We present design concepts that are expected to meet requirements, and identify R&D needs.
 
 
WEPSO88 High Precision Electronics for Single Pass Applications linac, instrumentation, alignment, pick-up 715
 
  • M. Žnidarčič, R. Hrovatin
    I-Tech, Solkan, Slovenia
  • M. Satoh
    KEK, Ibaraki, Japan
 
  Monitoring and subsequent optimization of electron Linacs and transfer lines requires specific instrumentation for beam position data acquisition and processing. Libera Single Pass E is the newly developed instrument intended for position and charge monitoring in basic and multi-mode operation LINACs. Development, initial measurements and verification of the instrumentation performance were conducted in the Instrumentation Technologies' laboratories, followed by the characterization measurements of the unit carried out at KEK Linac facility.  
 
THOCNO03 The Potential Uses of X-ray FELs in Nuclear Studies laser, photon, optics, target 749
 
  • W.-T. Liao, C.H. Keitel, A. Pálffy
    MPI-K, Heidelberg, Germany
 
  X-ray FELs have the potential to allow the study of electronic-nuclear and nuclear dynamics. Observation of such interactions, and the possibility of controling them, offers the prospect of a great leap in science capability. Discussions of the possibilities are reatively recent and both FEL scientists and the potential users could benefit greatly via direct interaction at the conference.  
slides icon Slides THOCNO03 [8.591 MB]