PAC2013 - List of Authors (Constan-Wahl, D.)

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.

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.