MOP1WB —  WG-B   (18-Jun-18   14:00—15:30)
Chair: P.A.P. Nghiem, IRFU, CEA, University Paris-Saclay, Gif-sur-Yvette, France
Paper Title Page
500 MeV@ CW 5 mA Beam Dynamics for CIADS and Beam Commissioning of 25 MeV CW Proton Superconducting Linac  
  • Y. He
    IMP/CAS, Lanzhou, People's Republic of China
  This talk is about 500 MeV@ CW 5 mA beam dynamics for CIADS and beam commissioning of 25 MeV CW proton superconducting linac.  
slides icon Slides MOP1WB01 [21.248 MB]  
MOP1WB02 Understanding the Source and Impact of Errant Beam Loss in the Spallation Neutron Source (SNS) Super Conducting Linac (SCL)* -1
  • C.C. Peters, D. Curry, G.D. Johns, T.B. Southern
    ORNL RAD, Oak Ridge, Tennessee, USA
  • A.V. Aleksandrov, W. Blokland, B. Han, T.A. Justice, S.-H. Kim, M.A. Plum, A.P. Shishlo, M.P. Stockli, J.Y. Tang, R.F. Welton
    ORNL, Oak Ridge, Tennessee, USA
  Funding: *ORNL is managed by UT-Battelle, LLC, under contract DE-AC05- 00OR22725 for the U.S. Department of Energy.
The Spallation Neutron Source (SNS) Linear Accelerator (Linac) delivers a high power proton beam (>1 MW) for neutron production with high neutron availability (>90%). For beam acceleration, the Linac has both normal and super conducting RF sections, with the Super Conducting Linac (SCL) portion providing the majority of beam acceleration (81 of 96 RF cavities are super conducting). Operationally, the goal is to achieve the highest possible beam energy by maximizing SCL cavity RF gradients, but not at the expense of cavity reliability. One mechanism that has negatively impacted both SCL cavity RF gradients and reliability is beam lost into the SCL due to malfunctions of upstream components. Understanding the sources and impacts of errant beam on SCL cavity performance will be discussed.
slides icon Slides MOP1WB02 [19.080 MB]  
MOP1WB03 Experimental Study of Beam Dynamics in the PIP-II MEBT Prototype -1
  • A.V. Shemyakin, J.-P. Carneiro, B.M. Hanna, V.A. Lebedev, L.R. Prost, A. Saini, V.E. Scarpine
    Fermilab, Batavia, Illinois, USA
  • C.J. Richard
    NSCL, East Lansing, Michigan, USA
  • V.L. Sista
    BARC, Mumbai, India
  Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics
The Proton Improvement Plan, Stage Two (PIP-II) is a program of upgrades proposed for the Fermilab injection complex, which central part is an 800-MeV, 2-mA CW SRF linac. A prototype of the PIP-II linac front end called PIP-II Injector Test (PIP2IT) is being built at Fermilab. As of now, a 15-mA DC, 30-keV H ion source, a 2 m-long Low Energy Beam Transport (LEBT), a 2.1-MeV CW RFQ, followed by a 10-m Medium Energy Beam Transport (MEBT) have been assembled and commissioned. The MEBT bunch-by-bunch chopping system and the requirement of a low uncontrolled beam loss put stringent limitations on the beam envelope and its variation. Measurements of transverse and longitudinal beam dynamics in the MEBT were performed in the range of 1-10 mA of the RFQ beam current. Almost all measurements are made with 10 μs beam pulses in order to avoid damage to the beam line. This report presents measurements of the transverse optics with differential trajectories, reconstruction of the beam envelope with scrapers and an Allison emittance scanner, as well as bunch length measurements with a Fast Faraday Cup.
slides icon Slides MOP1WB03 [3.750 MB]