Keyword: acceleration
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MOPG39 Upgrade of the LHC Bunch by Bunch Intensity Measurement Acquisition System FPGA, real-time, proton, interface 135
  • D. Belohrad, D. Esperante Pereira, J. Kral, S.B. Pedersen
    CERN, Geneva, Switzerland
  The fast beam intensity measurement systems for the LHC currently use an analogue signal processing chain to provide the charge information for individual bunches. This limits the possibility to use higher level correction algorithms to remove systematic measurement errors coming from the beam current transformer and the associated analogue electronics chain. In addition, the current measurement system requires individual settings for different types of beams, implying the need for continuous tuning during LHC operation. Using modern technology, the analogue measurement chain can be replaced by an entirely digital acquisition system, even in a case of the short, pulsed signals produced by the LHC beams. This paper discusses the implementation of the new digital acquisition system and the calculations required to reconstruct the individual LHC bunch intensities, along with the presentation of results from actual beam measurements.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG39  
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TUBL04 Electro-Optical Methods for Multipurpose Diagnostics laser, electron, plasma, 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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WEPG48 A THz Driven Transverse Deflector for Femtosecond Longitudinal Profile Diagnostics electron, laser, vacuum, diagnostics 748
  • S.P. Jamison, E.W. Snedden, D.A. Walsh
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • M.J. Cliffe, D.M. Graham, D. Lake
    The University of Manchester, The Photon Science Institute, Manchester, United Kingdom
  Progress towards a THz-driven transverse deflecting longitudinal profile diagnostic is presented. The deflector is driven with sub-picosecond quasi-single cycle THz fields generated by non-linear optical rectification. To utilize the large deflection field strength of the source for longitudinal diagnostics it is necessary to maintain the single-cycle field profile of the THz pulse throughout the interaction with the relativistic beam. Our scheme allows for the octave spanning bandwidth of the single-cycle pulses to propagate without dispersion at subluminal velocities matched to co-propagating relativistic electrons, by passing the pulse distortion and group-carrier walk-off limitations of dielectric loaded waveguide structure. The phase velocity is readily tuneable, both above and below the speed of light in a vacuum, and single-cycle propagation of deflecting fields at velocities down to 0.77c have been demonstrated.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG48  
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