Keyword: plasma
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MOPG35 Single Pulse Sub-Picocoulomb Charge Measured by a Turbo-ICT in a Laser Plasma Accelerator background, laser, target, electron 119
  • F. Stulle, J.F. Bergoz
    BERGOZ Instrumentation, Saint Genis Pouilly, France
  • W. Leemans, K. Nakamura
    LBNL, Berkeley, California, USA
  Funding: The work by the BELLA Center scientists and staff was supported by Office of Science, Office of HEP, US DOE under Contract DE-AC02-05CH11231 and the National Science Foundation.
Experiments at the Berkeley Lab Laser Accelerator (BELLA) verified that the Turbo-ICT allows high resolution charge measurements even in the presence of strong background signals. For comparison, a Turbo-ICT and a conventional ICT were installed on the BELLA petawatt beamline, both sharing the same vacuum flanges. We report on measurements performed using a gas-jet and a capillary-discharge based laser plasma accelerator. In both setups the Turbo-ICT was able to resolve sub-picocoulomb charges.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG35  
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TUBL04 Electro-Optical Methods for Multipurpose Diagnostics laser, electron, acceleration, target 290
  • R. Pompili, M.P. Anania, M. Bellaveglia, F.G. Bisesto, E. Chiadroni, A. Curcio, D. Di Giovenale, G. Di Pirro, M. Ferrario
    INFN/LNF, Frascati (Roma), Italy
  • A. Cianchi
    INFN-Roma II, Roma, Italy
  • A. Zigler
    The Hebrew University of Jerusalem, The Racah Institute of Physics, Jerusalem, Israel
  Electro-optic sampling (EOS) based temporal diagnostics allows to precisely measure the temporal profile of electron bunches with resolution of about 50 fs in a non-destructive and single-shot way. At SPARC_LAB we adopted the EOS in very different experimental fields. We measured for the first time the longitudinal profile of a train of multiple bunches at THz repetition rate, as the one required for resonant Plasma Wakefield Acceleration (PWFA) in a single-shot and non-intercepting way. By means of the EOS we demonstrated a new hybrid compression scheme that is able to provide ultra-short bunches (<90 fs) with ultra-low (<20 fs) timing-jitter relative to the EOS laser system. Furthermore, we recently developed an EOS system in order to provide temporal and energy measurements in a very noisy and harsh environment: electron beams ejected by the interaction of high-intensity (hundreds TW class) ultra-short (35fs) laser pulses with solid targets by means of the so-called Target Normal Sheath Acceleration (TNSA) method.  
slides icon Slides TUBL04 [2.183 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUBL04  
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TUPG62 X-Ray Smith-Purcell Radiation for Non-Invasive Submicron Diagnostics of Electron Beams Having TeV Energy radiation, target, diagnostics, electron 494
  • A.A. Tishchenko, D.Yu. Sergeeva
    MEPhI, Moscow, Russia
  We present the general theory of X-ray Smith-Purcell radiation from ultrarelativistic beams proceeding from our earlier results. The theory covers also the case of oblique incidence of the beam to the target, which leads to the conical effect in spatial distribution of Smith-Purcell radiation and allows one to count the divergence of the beam; also, the analytical description of the incoherent form-factor of the beam is given.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG62  
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WECL01 Longitudinal Phase Space Diagnostics for Ultrashort Bunches With a Plasma Deflector laser, electron, wakefield, injection 597
  • I. Dornmair, A.R. Maier
    CFEL, Hamburg, Germany
  • I. Dornmair
    University of Hamburg, Hamburg, Germany
  • K. Flöttmann, B. Marchetti
    DESY, Hamburg, Germany
  • A.R. Maier
    University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
  • C.B. Schroeder
    LBNL, Berkeley, California, USA
  We present with simulations a new method to diagnose the longitudinal phase space of ultrashort electron bunches. It harnesses the strong transverse fields of laser-driven wakefields to streak an electron bunch that is injected off-axis with respect to the driver laser. Owed to the short plasma wavelength and the high field amplitude present in a plasma wakefield, a temporal resolution around or below the femtosecond can be achieved with a plasma length of a few millimeters. We will explore the limitations on the time resolution, the calibration, and the influence of error sources such as beam loading and jitters. Amongst the possible applications are experiments aiming at external injection into laser-driven wakefields, or the diagnostics of laser-plasma accelerated beams.  
slides icon Slides WECL01 [5.430 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WECL01  
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WEPG51 A Transverse Deflecting Structure for the Plasma Wakefield Accelerator Experiment, FLASHForward emittance, optics, cavity, quadrupole 759
  • R.T.P. D'Arcy, V. Libov, J. Osterhoff
    DESY, Hamburg, Germany
  The FLASHForward project at DESY is an innovative plasma-wakefield acceleration experiment, aiming to accelerate electron beams to GeV energies over a few centimeters of ionized gas. These accelerated beams must be of sufficient quality to be used in a free-electron laser; achievable only through rigorous analysis of both the drive- and accelerated-beam's longitudinal phase space. The pulse duration of these accelerated beams is typically in the few femtosecond range, and thus difficult to resolve with traditional diagnostic methods. In order to longitudinally resolve these very short bunch-lengths, it is necessary to utilize the properties of a transverse RF deflector (operating in the hybrid electromagnetic mode, HEM11), which provides a relation between longitudinal and transverse co-ordinates. It is proposed that this type of device, commonly known as a Transverse Deflecting Structure (TDS) due to its 'streaking' in the transverse plane, will be introduced to the FLASHForward beamline in order to perform these single-shot longitudinal phase space measurements. The initial investigations into the realization of this diagnostic tool are outlined.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG51  
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WEPG61 Theory of X-Ray Transition Radiation from Graphene for Transition Radiation Detectors radiation, electron, detector, target 788
  • A.A. Tishchenko, A. Romaniouk, D.Yu. Sergeeva, M.N. Strikhanov
    MEPhI, Moscow, Russia
  We present the theory of transition radiation for monolayers in X-ray domain from the first principles and consider the pros and cons of using graphene-monolayer in transition radiation detectors.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG61  
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