Publications

Invited Talks

• Nb3Sn Present Status and Potential as an Alternative SRF Material.
  Linear Accelerator Conference 2014, Geneva, Switzerland.
• SRF Cavities Beyond Niobium: Potential and Challenges.
  North American Particle Accelerator Conference 2013, Pasadena, CA, USA.
• Theoretical Field Limits for Multi-Layer Superconductors.
  SRF Conference 2013, Paris, France.

Contributed Talks

• First Single Cell Cavity Fabricated in Cornell's Nb3Sn Program.
  North American Particle Accelerator Conference 2013, Pasadena, CA, USA.
• Update on the Development of Coated Cavities.
  Linear Collider Workshop 2013, Hamburg, Germany.
• First Single Cell Cavity Fabricated in Cornell's Nb3Sn Program.
  Tesla Technology Collaboration Meeting 2012, Newport News, VA, USA.
• The Closing Quasiparticle Spectral Gap and its Implications for Nb3Sn.
  SRF Materials Workshop 2012, Newport News, VA, USA.
• Cornell SRF New Materials Program: Nb3Sn Development
  TESLA Technology Collaboration Meeting 2011, Beijing, China (remote presentation).
• Stoichiometric Nb3Sn in First Samples Coated at Cornell
  SRF Conference 2011, Chicago, IL, USA (Award talk).
• Simulations in ANSYS
  International Higher Order Mode (HOM) Workshop 2010, Ithaca, NY, USA.
• Nb3Sn Fabrication and Sample Characterization at Cornell
  International Thin Films and New Ideas for SRF Workshop 2010, Padua, Italy.
• Design of a Neutral Beam Injector for STOR-U
  Canadian Association of Physicists Congress 2009, Moncton, New Brunswick.

Peer-Reviewed Journal Articles

• Advances in development of Nb3Sn superconducting radio-frequency cavities
  S. Posen and M. Liepe, Phys. Rev. ST Accel. Beams 15, 112001 (2014).
• The main linac cavity for Cornell's energy recovery linac: Cavity design through horizontal cryomodule prototype test
  N. Valles, M. Liepe, F. Furuta, M. Gi, D. Gonnella, Y. He, K. Ho, G. Hoffstaetter, D.S. Klein, T. O'Connell, S. Posen, P. Quigley, J. Sears, G.Q. Stedman, M. Tigner, V. Veshcherevich, Nuclear Instruments and Methods in Physics Research Section A, 734, pp. 23-31.
• Mechanical optimization of superconducting cavities in continuous wave operation
  S. Posen and M. Liepe, Phys. Rev. ST Accel. Beams 15, 022002 (2012).

Conference Proceedings

• Nb3Sn Materials Studies
  S. Posen, M. Liepe, Linear Accelerator Conference 2014, Geneva, Switzerland.
• Analysis of Systematic and Random Error in SRF Material Parameter Calculations
  S. J. Meyers, S. Posen, M. Liepe, Linear Accelerator Conference 2014, Geneva, Switzerland.
• Nitrogen-Doped 9-Cell Cavity Performance in the Cornell Horizontal Test Cryomodule
  D. Gonnella, R. G. Eichhorn, F. Furuta, M. Ge, D. L. Hall, Y. He, G. H. Hoffstaetter, M. Liepe, T. O'Connel, S. Posen, P. Quigley, J. Sears, V. Veshcherevich, A. Grassellino, A. S. Romanenko, Linear Accelerator Conference 2014, Geneva, Switzerland.
• Nb3Sn for SRF Application
  M. Liepe and S. Posen, SRF Conference 2013, Paris, France, USA.
• RF Test Results of the first Nb3Sn Cavities Coated at Cornell
  S. Posen and M. Liepe, SRF Conference 2013, Paris, France, USA.
• Record Quality Factor Performance of the Prototype Cornell ERL Main Linac Cavity in the Horizontal Test Cryomodule
  N.R.A. Valles, R.G. Eichhorn, F. Furuta, G.M. Ge, D. Gonnella, D.L. Hall, Y. He, K.M.V. Ho, G.H. Hoffstaetter, M. Liepe, T.I. O'Connel, S. Posen, P. Quigley, J. Sears, V. Veshcherevich, SRF Conference 2013, Paris, France, USA.
• High Q Cavities for the Cornell ERL Main Linac
  R.G. Eichhorn, B. Bullock, B. Clasby, B. Elmore, F. Furuta, A. Ganshin, G.M. Ge, D. Gonnella, D.L. Hall, Y. He, K.M.V. Ho, G.H. Hoffstaetter, J.J. Kaufman, M. Liepe, T.I. O'Connel, S. Posen, P. Quigley, J. Sears, V.D. Shemelin, E.N. Smith, V. Veshcherevich, SRF Conference 2013, Paris, France, USA.
• Recent Findings on Nitrogen Treated Niobium
  R.G. Eichhorn, A. Ganshin, A. Holmes, J.J. Kaufman, S.R. Markham, S. Posen, E.N. Smith, SRF Conference 2013, Paris, France, USA.
• Muon Spin Rotation Studies of Bulk Electropolished Cavity Cutouts and Thin Films of Alternative Materials
  A. Grassellino, A. Romanenko, D.A. Sergatskov, T. Buck, R.E. Laxdal, M. Liepe, S. Posen, and Y. Trenikhina, SRF Conference 2013, Paris, France, USA (poster only).
• Theoretical Description of SIS Multilayer Films for SRF Cavities
  S. Posen, M. Liepe, J. Sethna, G. Catelani, M. Transtrum, North American Particle Accelerator Conference 2013, Pasadena, CA, USA.
• Achieving High Accuracy in Cornell's ERL Cavity Production
  R.G. Eichhorn, B. Bullock, B. Clasby, J.J. Kaufman, B.M. Kilpatrick, S. Posen, J. Sears, V.D. Shemelin, T. Kürzeder, North American Particle Accelerator Conference 2013, Pasadena, CA, USA.
• Cryomodule Performance of the Main Linac Prototype Cavity for Cornell's Energy Recovery Linac
  N.R.A. Valles, R.G. Eichhorn, F. Furuta, G.M. Ge, D. Gonnella, D.L. Hall, Y. He, K.M.V. Ho, G.H. Hoffstaetter, M. Liepe, T.I. O'Connell, S. Posen, P. Quigley, J. Sears, V. Veshcherevich, North American Particle Accelerator Conference 2013, Pasadena, CA, USA.
• Measurement of the Mechanical Properties of Superconducting Cavities During Operation
  S. Posen and M. Liepe, International Particle Accelerator Conference 2012, New Orleans, LA, USA.
• Minimizing Helium Pressure Sensitivity in Elliptical SRF Cavities
  S. Posen and M. Liepe, International Particle Accelerator Conference 2012, New Orleans, LA, USA.
• Residual Resistance Studies at Cornell
  S. Posen D. Gonnella, G. Hoffstaetter, and M. Liepe, International Particle Accelerator Conference 2012, New Orleans, LA, USA.
• Recent Developments in the Cornell Nb3Sn Initiative
  S. Posen G. Hoffstaetter, M. Liepe, and Y. Xie, International Particle Accelerator Conference 2012, New Orleans, LA, USA.
• Quench Studies of a Superconducting RF Cavity
  D. Gonnella, M. Liepe, and S. Posen, International Particle Accelerator Conference 2012, New Orleans, LA, USA.
• High Current Operation of the Cornell ERL Superconducting RF Injector Cryomodule
  M. Liepe, G. Hoffstaetter, S. Posen P. Quigley, and V. Veshcherevich, International Particle Accelerator Conference 2012, New Orleans, LA, USA.
• Progress on Superconducting RF Work for the Cornell ERL
  M. Liepe, F. Furuta, M. Ge, Y. He, G. Hoffstaetter, T. O'Connell, S. Posen J. Sears, M. Tigner, N. Valles, and V. Veshcherevich, International Particle Accelerator Conference 2012, New Orleans, LA, USA.
• Testing of the Main-Linac Prototype Cavity in a Horizontal Test Cryomodule for the Cornell ERL
  N. Valles, F. Furuta, M. Ge, Y. He, K. Ho, G. Hoffstaetter, M. Liepe, T. O'Connell, S. Posen P. Quigley, J. Sears, M. Tigner, and V. Veshcherevich, International Particle Accelerator Conference 2012, New Orleans, LA, USA.
• Experience with the Cornell ERL Injector SRF Cryomodule during High Beam Current Operation
  D.L. Hartill, G.H. Hoffstaetter, S. Posen, P. Quigley, V. Veshcherevich, International Particle Accelerator Conference 2011, San Sebastian, Spain.
• Cornell SRF New Materials Program
  S. Posen, M. Liepe, and Y. Xie, International Particle Accelerator Conference 2011, San Sebastian, Spain.
• Stoichiometric Nb3Sn in First Samples Coated at Cornell
  S. Posen and M. Liepe, SRF Conference 2011, Chicago, IL, USA.
• HOM Measurements with Beam at the Cornell Injector Cryomodule
  S. Posen and M. Liepe, SRF Conference 2011, Chicago, IL, USA.
• Minimizing Microphonics Detuning by Optimization of Stiffening Rings
  S. Posen and M. Liepe, SRF Conference 2011, Chicago, IL, USA.
• Quench Studies in Large and Fine Grain Nb Cavities
  Sam Posen, Nicholas Ruben Alexander Valles, and M. Liepe SRF Conference 2011, Chicago, IL, USA.
• Superconducting RF R&D for the Cornell ERL Main Linac
  Matthias Liepe, Yun He, Georg H. Hoffstaetter, Sam Posen, James Sears, Valery D. Shemelin, Maury Tigner, Nicholas Ruben Alexander Valles, and Vadim Veshcherevich, SRF Conference 2011, Chicago, IL, USA.
• HOM Measurements with Beam at the Cornell Injector Cryomodule
  S.E. Posen and M. Liepe, Particle Accelerator Conference 2011, New York, NY, USA.
• Progress on Superconducting RF for the Cornell Energy-Recovery-Linac
  M. Liepe, G.H. Hoffstaetter, S.E. Posen, J. Sears, V.D. Shemelin, M. Tigner, N.R.A. Valles, V. Veshcherevich, Particle Accelerator Conference 2011, New York, NY, USA.
• Cornell ERL Research and Development
  C.E. Mayes, I.V. Bazarov, S.A. Belomestnykh, D.H. Bilderback, M.G. Billing, J.D. Brock, E.P. Chojnacki, J.A. Crittenden, L. Cultrera, J. Dobbins, B.M. Dunham, R.D. Ehrlich, M. P. Ehrlichman, E. Fontes, C.M. Gulliford, D.L. Hartill, G.H. Hoffstaetter, V.O. Kostroun, F.A. Laham, Y. Li, M. Liepe, X. Liu, F. Loehl, A. Meseck, A.A. Mikhailichenko, H. Padamsee, S. Posen, P. Quigley, P. Revesz, D.H. Rice, D. Sagan, V.D. Shemelin, E.N. Smith, K.W. Smolenski, A.B. Temnykh, M. Tigner, N.R.A. Valles, V. Veshcherevich, Y. Xie, Particle Accelerator Conference 2011, New York, NY, USA.
• Status of the Cornell ERL Injector Cryomodule
  M. Liepe, S. Belomestnykh, E. Chojnacki, Z. Conway, G. Hoffstaetter, R. Kaplan, S. Posen, P. Quigley, J. Sears, V. Shemelin, V. Veshcherevich, International Linear Accelerator Conference 2010, Tsukuba, Japan.
• Latest results and test plans from the 100 mA Cornell ERL injector SCRF cryomodule
  M. Liepe, S. Belomestnykh, E. Chojnacki, Z. Conway, G. Hoffstaetter, R. Kaplan, S. Posen, P. Quigley, J. Sears, V. Shemelin, and V. Veshcherevich, International Particle Accelerator Conference 2010, Kyoto, Japan.
• Coupled Electromagnetic-Thermal-Mechanical Simulations of Superconducting RF Cavities
  S.E. Posen, M. Liepe, N.R.A. Valles, International Particle Accelerator Conference 2010, Kyoto, Japan (poster presenter was S. Belomestnykh).

Other Scientific Contributions

• Cornell Energy Recovery Linac: Project Definition Design Report
  G. Hoffstaeter et al., Cornell University (technical report, 2011).
• Thermal profile of a physical vapor deposition sputter device
  Sam Posen and Andrew Zwicker, Journal of Undergraduate Research, Office of Science, US Department of Energy. 9: 247 (abstract summarizing Summer undergraduate internship, 2008).
• Fake Missing Transverse Energy from ATLAS Calorimeter Cosmic Ray Data
  Teuscher, R.J., Gibson, A., Posen, S., Guo, B., Rosenbaum, G., Ross, I., Asevedo, A., Meirose, B., Clement, C., Gollub, N., Maneira, J., Gentil, J., Maxa, Z., ATL-CAL-2008-002: 1-15 (ATLAS note from summer research internship at CERN, 2008).