Author: Apsimon, R.
Paper Title Page
MOPIK016 Sub-Picosecond Beam Production for External Injection Into Plasma Experiments 531
 
  • O. Mete Apsimon, R. Apsimon, G. Burt
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • G.X. Xia
    UMAN, Manchester, United Kingdom
 
  Funding: This work has been funded by STFC.
Applications of plasmas in accelerators benefit from short probe bunches comparable to plasma wavelength due to currently achievable plasma wake profiles. In plasma acceleration case, high capture efficiency within a narrow energy spectrum can be achieved when a sub-picosecond to femtosecond witness bunch injected behind the driver pulse at the high electric field region. A start-to-end simulation study was performed for parametric optimisation of an rf photoinjector to provide a short witness bunch for plasma applications in accelerators. An rf photoinjector is a laser-driven, high brightness and robust electron source that can provide stability and flexibility provided by today's advanced laser and rf technologies.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK016  
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MOPVA102 Modeling the Low Level RF Response on the Beam during Crab Cavity Quench 1098
 
  • R. Apsimon, G. Burt, A.C. Dexter
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • R.B. Appleby
    UMAN, Manchester, United Kingdom
  • P. Baudrenghien, K.N. Sjobak
    CERN, Geneva, Switzerland
 
  The High Luminosity Upgrade for the LHC (HL-LHC) relies on crab cavities to compensate for the luminosity reduction due to the crossing angle of the colliding bunches at the interaction points. In this paper we present the simulation studies of cavity quenches and the impact on the beam. The cavity voltage and phase during the quench is determined from a simulation in Matlab and used to determine the impact on the beam from tracking simulations in SixTrack. The results of this study are important for determining the required machine protection and interlock systems for HL-LHC.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA102  
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TUPAB114 Design Study for a Plasma Undulator Experiment Using Capillary Based Discharge Plasma Source 1584
 
  • O. Mete Apsimon, R. Apsimon, Y. Ma, D. Seipt, M.J.V. Streeter, A.G.R. Thomas
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • T.H. Pacey, G.X. Xia
    UMAN, Manchester, United Kingdom
 
  A plasma undulator is formed when a short laser pulse is injected into plasma off-axis or at an angle that causes the centroid of this laser pulse to oscillate. Ponderomotively driven plasma wake will follow this centroid given that the product of the plasma wave number and the characteristic Rayleigh length of the laser is much larger than one. This oscillating transverse wakefield may work as an undulator forcing particles to follow sinusoidal trajectories and emit synchrotron radiation. In this paper, plans for an experiment are introduced and resulting radiation and injected beam characteristics are discussed. The aforementioned laser centroid oscillations are demonstrated using, EPOCH, a PIC code for laser-plasma interactions.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB114  
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THPVA134 Coupled Longitudinal and Transverse Beam Dynamics Studies for Hadron Therapy Linacs 4772
 
  • R. Apsimon, G. Burt, S. Pitman
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • A.F. Green, H.L. Owen
    UMAN, Manchester, United Kingdom
 
  Precise proton therapy planning can be assisted by augmenting conventional medical imaging techniques with proton computed tomography (pCT). For adults this requires an incident proton energy up to at least 330 MeV, an energy not readily accessible using cyclotrons. We are presently constructing a prototype of the ProBE 54 MV/m 3GHz post-cyclotron booster linac as a compact method to achieve 330 MeV in the context of the Christie Hospital proton therapy centre, to be tested in the research room there. In this paper, we present beam dynamics studies and tracking simulations of proton beams through the booster region. The longitudinal and transverse particle transmission is calculated from tracking simulations and compared to theoretical models to help understand how best to optimise the optics design through the ProBE region.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA134  
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THPVA135 ProBE: Proton Boosting Extension for Imaging and Therapy 4776
 
  • S. Pitman, R. Apsimon, G. Burt
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • A.F. Green, H.L. Owen
    UMAN, Manchester, United Kingdom
  • A. Grudiev, A. Solodko, W. Wuensch
    CERN, Geneva, Switzerland
 
  Funding: This work was funded by STFC
The ProBE linac aims at accelerating protons from a particle therapy cyclotron to the c.330 MeV required for proton tomography. To obtain the c. 55 MV/m gradients required to achieve 100 MeV gain in a suitably short distance, we propose the use of a high-gradient S-band side-coupled standing-wave structure. In this paper we discuss the progress toward the testing of the prototype at the S-box facility at CERN.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA135  
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