PAC2013 - List of Authors (Webber, R.C.)

Paper	Title	Page
THPAC20	Beam Position and Phase Measurements of Microampere Beams at the Michigan State University ReA3 Facility	1187
	J.L. Crisp, B. Durickovic, G. Kiupel, D. Leitner, J.A. Rodriguez, T. Russo, R.C. Webber, W. Wittmer FRIB, East Lansing, Michigan, USA C.I. Briegel, N. Eddy, B.J. Fellenz, D. Slimmer Fermilab, Batavia, USA D. Constan-Wahl, S.W. Krause, S. Nash NSCL, East Lansing, Michigan, USA M. Wendt CERN, Geneva, Switzerland
	A high power CW, heavy ion linac will be the driver accelerator for the Facility for Rare Isotope Beams being designed at Michigan State University. The linac requires a Beam Position Monitoring (BPM) system with better than 100 micron resolution at 100 microamperes beam current. A low beam current test of the candidate technology, button pick-ups and direct digital down-conversion signal processing, was conducted in the ReA3 re-accelerated beam facility at MSU. The test is described. Beam position and phase measurement results, demonstrating ~200 micron and ~1 degree resolution in a 90 kHz bandwidth for a 0.5 microampere beam current, are reported.

THPHO14	RF Cavity Phase Calibration using Electromagnetic Pickups	1334
	B. Durickovic, J.L. Crisp, G. Kiupel, D. Leitner, J.A. Rodriguez, R.C. Webber FRIB, East Lansing, Michigan, USA D. Constan-Wahl, S.W. Krause, S. Nash, R. Rencsok, W. Wittmer NSCL, East Lansing, Michigan, USA
	Funding: Michigan State University FRIB funds: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 The Facility for Rare Isotope Beams (FRIB) is a heavy ion fragmentation facility to produce rare isotopes far from stability for low energy nuclear science. The facility will utilize a high-intensity, superconducting heavy-ion driver linac to provide stable ion beams from protons to uranium at energies greater than 200 MeV/u and at a beam power of up to 400 kW. The baseline design for the linac comprises over 300 accelerating superconducting cavities. A precondition for tuning the linac is calibrating the RF phase of each of these cavities, which requires a phase scan combined with energy measurements. In this work, we explore the use of electromagnetic pickups for this task. (We used capacitive style pickups.) Pickups provide fast readings, and measurements of the phase difference between a pair of pickups allows us to infer energy values (provided initial energy is known) and to reconstruct the phase-energy curve. We present an overview of the algorithm and measurement results of an implementation on the ReA3 re-accelerator.

FRYBA1	Progress towards the Facility for Rare Isotope Beams	1453
	J. Wei, N.K. Bultman, F. Casagrande, C. Compton, K.D. Davidson, J. DeKamp, B. Drewyor, K. Elliott, A. Facco, P.E. Gibson, T . Glasmacher, K. Holland, M.J. Johnson, S. Jones, D. Leitner, M. Leitner, G. Machicoane, F. Marti, D. Morris, J.A. Nolen, J.P. Ozelis, S. Peng, J. Popielarski, L. Popielarski, E. Pozdeyev, T. Russo, K. Saito, J.J. Savino, R.C. Webber, M. Williams, T. Xu, Y. Yamazaki, A. Zeller, Y. Zhang, Q. Zhao FRIB, East Lansing, USA D. Arenius, V. Ganni JLAB, Newport News, Virginia, USA A. Facco INFN/LNL, Legnaro (PD), Italy R.E. Laxdal TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada J.A. Nolen ANL, Argonne, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 The Facility for Rare Isotope Beams (FRIB) is based on a continuous-wave superconducting heavy ion linac to accelerate all the stable isotopes to above 200 MeV/u with a beam power of up to 400 kW. At an average beam power approximately two-to-three orders-of-magnitude higher than those of operating heavy-ion facilities, FRIB stands at the power frontier of the accelerator family - the first time for heavy-ion accelerators. To realize this innovative performance, superconducting RF cavities are used starting at the very low energy of 500 keV/u, and beams with multiple charge states are accelerated simultaneously. Many technological challenges specific for this linac have been tackled by the FRIB team and collaborators. Furthermore, the distinct differences from the other types of linacs at the power front must be clearly understood to make the FRIB successful. This report summarizes the technical progress made in the past years to meet these challenges.

Paper

Title

Page

Beam Position and Phase Measurements of Microampere Beams at the Michigan State University ReA3 Facility

1187

J.L. Crisp, B. Durickovic, G. Kiupel, D. Leitner, J.A. Rodriguez, T. Russo, R.C. Webber, W. Wittmer
FRIB, East Lansing, Michigan, USA
C.I. Briegel, N. Eddy, B.J. Fellenz, D. Slimmer
Fermilab, Batavia, USA
D. Constan-Wahl, S.W. Krause, S. Nash
NSCL, East Lansing, Michigan, USA
M. Wendt
CERN, Geneva, Switzerland

A high power CW, heavy ion linac will be the driver accelerator for the Facility for Rare Isotope Beams being designed at Michigan State University. The linac requires a Beam Position Monitoring (BPM) system with better than 100 micron resolution at 100 microamperes beam current. A low beam current test of the candidate technology, button pick-ups and direct digital down-conversion signal processing, was conducted in the ReA3 re-accelerated beam facility at MSU. The test is described. Beam position and phase measurement results, demonstrating ~200 micron and ~1 degree resolution in a 90 kHz bandwidth for a 0.5 microampere beam current, are reported.

THPHO14

RF Cavity Phase Calibration using Electromagnetic Pickups

1334

B. Durickovic, J.L. Crisp, G. Kiupel, D. Leitner, J.A. Rodriguez, R.C. Webber
FRIB, East Lansing, Michigan, USA
D. Constan-Wahl, S.W. Krause, S. Nash, R. Rencsok, W. Wittmer
NSCL, East Lansing, Michigan, USA

Funding: Michigan State University FRIB funds: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams (FRIB) is a heavy ion fragmentation facility to produce rare isotopes far from stability for low energy nuclear science. The facility will utilize a high-intensity, superconducting heavy-ion driver linac to provide stable ion beams from protons to uranium at energies greater than 200 MeV/u and at a beam power of up to 400 kW. The baseline design for the linac comprises over 300 accelerating superconducting cavities. A precondition for tuning the linac is calibrating the RF phase of each of these cavities, which requires a phase scan combined with energy measurements. In this work, we explore the use of electromagnetic pickups for this task. (We used capacitive style pickups.) Pickups provide fast readings, and measurements of the phase difference between a pair of pickups allows us to infer energy values (provided initial energy is known) and to reconstruct the phase-energy curve. We present an overview of the algorithm and measurement results of an implementation on the ReA3 re-accelerator.

FRYBA1

Progress towards the Facility for Rare Isotope Beams

1453

J. Wei, N.K. Bultman, F. Casagrande, C. Compton, K.D. Davidson, J. DeKamp, B. Drewyor, K. Elliott, A. Facco, P.E. Gibson, T . Glasmacher, K. Holland, M.J. Johnson, S. Jones, D. Leitner, M. Leitner, G. Machicoane, F. Marti, D. Morris, J.A. Nolen, J.P. Ozelis, S. Peng, J. Popielarski, L. Popielarski, E. Pozdeyev, T. Russo, K. Saito, J.J. Savino, R.C. Webber, M. Williams, T. Xu, Y. Yamazaki, A. Zeller, Y. Zhang, Q. Zhao
FRIB, East Lansing, USA
D. Arenius, V. Ganni
JLAB, Newport News, Virginia, USA
A. Facco
INFN/LNL, Legnaro (PD), Italy
R.E. Laxdal
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
J.A. Nolen
ANL, Argonne, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams (FRIB) is based on a continuous-wave superconducting heavy ion linac to accelerate all the stable isotopes to above 200 MeV/u with a beam power of up to 400 kW. At an average beam power approximately two-to-three orders-of-magnitude higher than those of operating heavy-ion facilities, FRIB stands at the power frontier of the accelerator family - the first time for heavy-ion accelerators. To realize this innovative performance, superconducting RF cavities are used starting at the very low energy of 500 keV/u, and beams with multiple charge states are accelerated simultaneously. Many technological challenges specific for this linac have been tackled by the FRIB team and collaborators. Furthermore, the distinct differences from the other types of linacs at the power front must be clearly understood to make the FRIB successful. This report summarizes the technical progress made in the past years to meet these challenges.