Publications and Talks

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  • A. Ushakov, S. Riemann and G. Moortgat-Pick
    Acceptable peak temperature and thermal stress in Ti6Al4V target of ILC positron source,
    POSIPOL 2018 Workshop, 3-5 September 2018, CERN, Geneva, Switzerland [pdf file]
  • S. Riemann, F. Dietrich, G. Moortgat-Pick, A. Ushakov, P. Sievers
    Status of the target for the undulator-based positron source,
    POSIPOL 2018 Workshop, 3-5 September 2018, CERN, Geneva, Switzerland [pdf file]
  • A. Ushakov, M. Kuriki, T. Takahashi, T. Omori and P. Sievers
    Shielding in target area of conventional positron source
    Itako Linear Collider Workshop, 27-28 November 2017, Itako, Japan [pdf file]
  • A. Ushakov
    ILC undulator-based positron source with quarter wave transformer at 250 GeV CM energy
    12th International Workshop POSIPOL-2017, 18-21 September 2017, Budker Institute of Nuclear Physics, Novosibirsk, Russia [pdf file]
  • A. Ushakov, S. Riemann
    Update of ILC positron source parameters
    POSIPOL 2016 Workshop, 14 - 16 September 2016, Laboratoire de l’Accélérateur Linéaire (LAL), University Paris-Sud, Orsay, France [pdf file]
  • A. Ushakov, S. Riemann, F. Dietrich, P. Sievers, G. Moortgat-Pick
    Update on target simulations of the undulator based e+ source
    POSIPOL 2015 Workshop, Cockcroft Institute, UK, 2-4 September 2015 [pdf file]
  • A. Ushakov, G. Moortgat-Pick, F. Dietrich, S. Riemann, P. Sievers
    Considerations of material stress under cyclic Load: KEKB experiment for damage of Ti extraction window
    Asian Linear Collider Workshop (ALCW2015), 20-24 April 2015, KEK Tsukuba, Japan [pdf file]
  • A. Ushakov, F. Dietrich, S. Riemann
    Thermal stress induced in solid targets by electron or photon beams
    2nd ANSYS Users Meeting at DESY, 12 February 2015, DESY Hamburg [pdf file]
  • S. Riemann, F. Staufenbiel, G. Moortgat-Pick, A. Ushakov
    Photon collimator system for the ILC positron source
    DESY Report: DESY 14-232, Nov 2014, 22 pp., arXiv:1412.2498
  • A. Ushakov, S. Riemann, P. Sievers
    Simulations for the photon target cooled by radiation
    POSIPOL 2014 Workshop, 27-29 August 2014, Ichinoseki, Japan [pdf file]
  • A. Ushakov
    Geant4 simulations of conventional positron source
    POSIPOL 2013 Workshop, 4-6 September 2013, Argonne National Laboratory, USA [pdf file]
  • A. Ushakov, G. Moortgat-Pick, S. Riemann, W. Liu, W. Gai
    Positron source simulations for ILC 1 TeV upgrade
    DESY Report: DESY 13-003, Jan 2013, 8 pp., arXiv:1301.1222
  • A. Ushakov, G. Moortgat-Pick, S. Riemann, A. Schälicke
    ILC positron source modeling up to 1 TeV
    POSIPOL 2012 Workshop, 4-6 September 2012, DESY, Zeuthen [pdf file]
  • L.I. Malysheva, O.S. Adeyemi, V. Kovalenko, G. Moortgat-Pick, A. Ushakov, S. Riemann, F. Staufenbiel, A. Hartin, B. List, N. Walker
    The design of spin-rotator with a possibility of helicity switching for polarized positron at the ILC
    3rd International Particle Accelerator Conference (IPAC12), New Orleans, Louisiana, USA, 20-25 May 2012, TUPPR003 [pdf file]
  • F. Staufenbiel, O. S. Adeyemi, V. Kovalenko, G. Moortgat-Pick, L. Malysheva, S. Riemann, A. Ushakov
    Heat load and stress studies for an design of the photon collimator for the ILC positron source
    Feb 2012, 10 pp., arXiv:1202.5987
  • V. Kovalenko, G. Moortgat-Pick, S. Riemann, A. Ushakov
    Depolarization in the ILC linac-to-ring positron beamline
    DESY Report: DESY 12-017, Feb 2012, 7 pp., arXiv:1202.0764
  • A. Ushakov, O. S. Adeyemi, G. Moortgat-Pick, F. Staufenbiel, S. Riemann
    Polarized positrons for the ILC - update on simulations
    DESY Report: DESY 12-018, Feb 2012, 11 pp., arXiv:1202.0752
  • V. Kovalenko, O.S. Adeyemi, A. Hartin, G. Moortgat-Pick, L. Malysheva, S. Riemann, F. Staufenbiel, A. Ushakov
    Spin tracking at the ILC positron source
    DESY Report DESY 12-019, Feb 2012, 8 pp., arXiv:1202.0751
  • L. Malysheva, O.S. Adeyemi, V. Kovalenko, G.A. Moortgat-Pick, A. Ushakov, S. Riemann, F.  Staufenbiel, K.  Buesser, A.F. Hartin, N.J. Walker
    The luminosity for the ILC travelling focus regime with offsets and angular scans
    2nd International Particle Accelerator Conference (IPAC'11), San Sebastian, Spain, 4‑9 September 2011, TUPC004 [pdf file]
  • A. Ushakov, O.S. Adeyemi, G. Moortgat-Pick, F. Staufenbiel, S. Riemann
    Polarized positrons for the ILC - update on simulations
    POSIPOL 2011 Workshop, 28-30 August 2011, IHEP, Beijing, China [pdf file]
  • A. Ushakov, O. S. Adeyemi, G. Moortgat-Pick, F. Staufenbiel, S. Riemann
    Simulations of heat load and induced stress in target of ILC positron source
    ILC Positron Collaboration Meeting, 27 August 2011, IHEP, Beijing, China [pdf file]
  • O. S. Adeyemi, V. Kovalenko, G. Moortgat-Pick, S. Riemann, A. Schälicke, A. Ushakov
    Undulator-based positron source with photon collimator and QWT
    2011 Linear Collider Workshop of the Americas, 19-23 March 2011, University of Oregon, Eugene, USA [pdf file]
  • A. Schälicke, S. Riemann, A. Ushakov
    PPS-Sim. Tools to design and optimize the polarized positron source
    Workshop on Spin Simulation Tools, 9-11 November 2010, DESY, Hamburg [pdf file]
  • A. Ushakov, A. Schälicke, S. Riemann
    Status of positron source simulation in Zeuthen
    PosiPol 2010 Workshop, 31 May - 2 June 2010, KEK, Tsukuba, Japan [pdf file]
  • S. Riemann, A. Schälicke, A. Ushakov
    Lithium lens simulation for ILC positron source
    PosiPol 2009 Workshop, 23-26 June 2009, IPNL, Lyon, France [pdf file]
  • S. Riemann, A. Schälicke, A. Ushakov
    Positron source modelling using Geant4
    PosiPol 2009 Workshop, 23-26 June 2009, IPNL, Lyon, France [pdf file]
  • S. Hesselbach, I.R. Bailey, J.L. Fernandez-Hernando, L.J. Jenner, G.A. Moortgat-Pick, S. Riemann, J.H. Rochford, A. Schälicke, A. Ushakov, L. Zang
    Positron source target survivability studies
    Particle Accelerator Conference (PAC09), Vancouver, Canada, 4-8 May 2009, MO6RFP061 [pdf file]
  • B. Aurand, I. Bailey, C. Bartels, A. Brachmann, J. Clarke, A. Hartin, J. Hauptman, C. Helebrant, S. Hesselbach, D. Kafer , J. List, W. Lorenzon, I. Marchesini, K. Mönig, K.C. Moffeit, G. Moortgat-Pick, S. Riemann, A. Schälicke, P. Schüler , P. Starovoitov, A. Ushakov, U. Velte, J. Wittschen, M. Woods
    Beam polarization at the ILC: The physics impact and the accelerator solutions
    International Linear Collider Workshop (LCWS08 and ILC08), Chicago, Illinois, USA, 16-20 November 2008, arXiv:0903.2959
  • J. A. Clarke, I. R. Bailey, E. Baynham, V. Bharadwaj, T. W. Bradshaw, A. Brummitt, A. Bungau, F. S. Carr, N. A. Collomb, J. Dainton, R. Dollan, W. Gai, J. Gronberg, A. F. Hartin, S. Hesselbach, K. M. Hock, Y. Ivanyushenkov, L. J. Jenner, K. Laihem, A. Lintern, W. Liu, T. Lohse, O. B. Malyshev, L. I. Malysheva, A. A. Mikhailichenko, G. A. Moortgat-Pick, W. T. Piggott, S. Riemann, J. Rochford, N. C. Ryder, A. Schälicke, D. J. Scott, J. C. Sheppard, A. Ushakov, L. Zang
    The design of the positron source for the International Linear Collider
    European Particle Accelerator Conference (EPAC'08), Genoa, Italy, 23-27 June 2008, 1915 [pdf file]
  • G. Moortgat-Pick, I. R. Bailey, D. P. Barber, E. Baynham, A. Birch, T. Bradshaw, A. Brummitt, S. Carr, J. A. Clarke, P. Cooke, J. B. Dainton, T. Hartin, L. J. Jenner, A. Lintern, L. I. Malysheva, O. B. Malyshev, J. Rochford, S. Riemann, A. Schälicke, P. Schmid, D. J. Scott, A. Ushakov, Y. Ivanyushenkov
    Challenge of polarized beams at future colliders
    Journal of Physics: Conference Series 110 (2008) 112004
  • B. Aurand, I. Bailey, C. Bartels, G. Blair, A. Brachmann, J. Clarke, L. Deacon, V. Duginov, A. Ghalumyan, A. Hartin, J. Hauptman, C. Helebrant, S. Hesselbach, D. Kafer, J. List, W. Lorenzon, A. Lyapin, I. Marchesini, R. Melikian, K. Mönig, K.C. Moffeit, G. Moortgat-Pick, N. Muchnoi, V. Nikoghosyan, S. Riemann, A. Sailer, A. Schälicke, H.J. Schreiber, P. Schüler, P. Starovoitov, E. Torrence, A. Ushakov, U. Velte , M. Viti, G. Weiglein, J. Wittschen, M. Woods
    Executive summary of the workshop on polarisation and beam energy measurements at the ILC
    Workshop on Polarization and Energy measurements at the ILC, Zeuthen, Germany, 9‑11 April 2008, arXiv:0808.1638
  • A. Schälicke, G. Alexander, R. Dollan, K. Laihem, T. Lohse, S. Riemann, P. Starovoitov, A. Ushakov
    Study on low-energy positron polarimetry
    Pramana - Journal of Physics 69 (2007) 1171
  • A. Ushakov, S. Riemann
    Target issues for different undulator parameters
    European LC Workshop Meeting, 8-9 January 2007, Daresbury Laboratory, UK [pdf file]
  • A. Ushakov, S. Riemann
    Target damage simulation
    1st ILC Positron Source Group Meeting, 27-29 September 2006, Rutherford Appleton Laboratory, Oxford, UK [pdf file]
  • A. Ushakov, S. Riemann
    Positron source activation
    1st ILC Positron Source Group Meeting, 27-29 September 2006, Rutherford Appleton Laboratory, Oxford, UK [pdf file]
  • A. Ushakov, M. Droba, N. Joshi, U. Ratzinger
    High current beams up to 150 keV at Frankfurt
    GSI Scientific Report (2004) ACCS-OPD-12 [pdf file]
  • R. A. Carrigan, J. Freudenberger, S. Fritzler, H. Genz, A. Richter, A. Ushakov, A. Zilges, J. P. F. Sellschop
    Electron channeling radiation experiments at very high electron bunch charges
    Physical Review A 68 (2003) 062901
  • O. Meusel, A. Jakob, J. Pozimski, U. Ratzinger, A. Ushakov
    Low energy beam transport development at IAP
    GSI Scientific Report (2003) 261 [pdf file]
  • O. Meusel, J. Pozimski, U. Ratzinger, A. Ushakov
    Low energy beam transport using Gabor lenses
    GSI Scientific Report (2002) 197 [pdf file]
  • D. Pugachov, G. Buschhorn, R. Kotthaus, V. L. Morokhovskii, J. They, H. Genz, A. Richter, A. Ushakov
    Polarization properties of coherent polarization radiation of relativistic electrons in a crystal
    Physics Letters A 286 (2001) 70
  • S. V. Dudin, A. V. Zykov, A. V. Ushakov, V. I. Farenik
    Equilibrium states of an ion-beam plasma with magnetized electrons at low pressures
    Technical Physics Letters 24 (1998) 180
  • S. V. Dudin, A. V. Ushakov, V. I. Farenik
    Features of application of electric probes in crossed non-uniform E and H fields
    Proceedings of the IEEE International Conference on Plasma Science (ICOPS'96), Boston, Massachusetts, USA (1996) 117
  • S. V. Dudin, A. V. Zykov, A. V. Ushakov, V. I. Farenik
    Electron distribution function of an ion-beam plasma in nonuniform EH fields
    Technical Physics Letters 22 (1996) 969
  • A. V. Ushakov, V. I. Farenik
    Probe measurements of the parameters of the electron component in the accelerators with closed drift of electrons
    Proceedings of the IEEE International Conference on Plasma Science (ICOPS'95), Madison, Wisconsin, USA (1995) 225
  • S. V. Dudin, A. V. Zykov, A. V. Ushakov, V. I. Farenik
    About the two regimes of the discharge in crossed EH fields at low pressure
    Proceedings of the IEEE International Conference on Plasma Science (ICOPS'95), Madison, Wisconsin, USA (1995) 147
  • S. V. Dudin, A. V. Zykov, A. V. Ushakov
    Electron dynamics in an axially nonuniform EH anode sheath of a low-pressure discharge
    Technical Physics Letters 21 (1995) 54
  • S. V. Dudin, A. V. Zykov, A. V. Ushakov
    Dynamics of electrons in anode layer of Hall-type ion source
    Proceedings of the IEEE International Conference on Plasma Science (ICOPS'94), Santa Fe, USA (1994) 175