HB2012 - List of Keywords (cyclotron)

Paper	Title	Other Keywords	Page
MOP253	Progress with Bunch-shape Measurements at PSI's High-power Cyclotrons and Proton Beam Lines	proton, scattering, simulation, background	187
	R. Dölling PSI, Villigen PSI, Switzerland
	As proposed at HB2010, additional bunch-shape monitors have been installed at the last turns of the Injector 2 cyclotron and at several locations in the connecting beam line to the Ring cyclotron (@72 MeV), as well as behind the Ring cyclotron (@590 MeV). Now at each location in the beam lines, longitudinal-transversal 2D-density distributions of the bunched 2.2 mA proton beam can be taken from four angles of view, each separated by 45°. In addition the monitor in Injector 2 has been upgraded to observe the 13 outermost turns (@57 to 72 MeV), some of them from two or three angles of view. The measurement setup, data evaluation and results are outlined.

MOP258	Simulation of Intense Proton Beams in Novel Isochronous FFAG Designs	space-charge, lattice, simulation, extraction	211
	S.L. Sheehy STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom M. Berz, K. Makino MSU, East Lansing, Michigan, USA C. Johnstone Fermilab, Batavia, USA P. Snopok Illinois Institute of Technology, Chicago, Illinois, USA
	Recent developments in the design of non-scaling fixed field alternating gradient (FFAG) accelerators have been focused on achieving isochronous behavior with a small betatron tune excursion. These advances are particularly interesting for applications requiring CW beams, such as Accelerator Driven Systems for energy generation or waste transmutation. The latest advances in lattice design have resulted in a 330 MeV to 1 GeV lattice, isochronous to better than ± 1 percent. This paper reports on simulations of recent lattice designs incorporating 3D space charge effects.

TUO1A03	Space Charge Effects in Isochronous FFAGs and Cyclotrons	space-charge, focusing, TRIUMF, simulation	231
	T. Planche, R.A. Baartman, Y.-N. Rao TRIUMF, Vancouver, Canada
	Effects of space charge forces on the beam dynamics of isochronous rings will be discussed. Two different kinds of phenomena will be introduced through a brief review of the literature on the topic. The first one is a consequence of the very weak vertical focusing found in the low energy region of most cyclotrons. The space charge tune shift further reduces the vertical focusing, setting an upper limit on instantaneous current. The second one arises from the fact that longitudinal phase space is frozen in isochronous rings. This leads to effects of space charge forces which are very peculiar to isochronous machines. We will finally present the simulation tools being developed at TRIUMF to study these effects.
	Slides TUO1A03 [0.974 MB]

WEO3A03	Extraction, Transport and Collimation of the PSI 1.3 MW Proton Beam	target, proton, extraction, neutron	373
	D. Reggiani PSI, Villigen PSI, Switzerland
	With an average operating beam power of 1.3 MW the PSI proton accelerator complex is currently leading the race towards the high intensity frontier of particle accelerators. This talk gives an overview of the extraction of the 590 MeV beam from the ring cyclotron and its low loss transport to the meson production targets M and E as well as to the SINQ spallation neutron source. Particular regard is given to the collimator system reshaping the beam which leaves the 40 mm thick graphite target E before reaching SINQ. Since 2011, up to 8 second long beam macro-pulses are regularly diverted to the new UCN spallation source by means of a fast kicker magnet. The switchover from the SINQ to the UCN beam line as well as the smooth beam transport up to the UCN spallation target constitute the subject of the last part of the talk.
	Slides WEO3A03 [2.728 MB]

THO1C01	High Intensity Operation and Control of Beam Losses in a Cyclotron Based Accelerator	target, extraction, proton, neutron	555
	M. Seidel, J. Grillenberger, A.C. Mezger PSI, Villigen PSI, Switzerland
	This presentation discusses aspects of high intensity operation in PSI's cyclotron based proton accelerator (HIPA). Major beam loss mechanisms and tuning methods to minimize losses are presented. Concept and optimization of low loss beam extraction from a cyclotron are described. Collimators are used to localize beam losses and activation. Activation levels of accelerator components are shown. An overview on instrumentation for loss monitoring and prevention of failure situations is given. Other relevant aspects include the beam trip statistics and grid to beam power conversion efficiency.
	Slides THO1C01 [3.642 MB]

Paper

Title

Other Keywords

Page

MOP253

Progress with Bunch-shape Measurements at PSI's High-power Cyclotrons and Proton Beam Lines

proton, scattering, simulation, background

187

R. Dölling
PSI, Villigen PSI, Switzerland

As proposed at HB2010, additional bunch-shape monitors have been installed at the last turns of the Injector 2 cyclotron and at several locations in the connecting beam line to the Ring cyclotron (@72 MeV), as well as behind the Ring cyclotron (@590 MeV). Now at each location in the beam lines, longitudinal-transversal 2D-density distributions of the bunched 2.2 mA proton beam can be taken from four angles of view, each separated by 45°. In addition the monitor in Injector 2 has been upgraded to observe the 13 outermost turns (@57 to 72 MeV), some of them from two or three angles of view. The measurement setup, data evaluation and results are outlined.

MOP258

Simulation of Intense Proton Beams in Novel Isochronous FFAG Designs

space-charge, lattice, simulation, extraction

211

S.L. Sheehy
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
M. Berz, K. Makino
MSU, East Lansing, Michigan, USA
C. Johnstone
Fermilab, Batavia, USA
P. Snopok
Illinois Institute of Technology, Chicago, Illinois, USA

Recent developments in the design of non-scaling fixed field alternating gradient (FFAG) accelerators have been focused on achieving isochronous behavior with a small betatron tune excursion. These advances are particularly interesting for applications requiring CW beams, such as Accelerator Driven Systems for energy generation or waste transmutation. The latest advances in lattice design have resulted in a 330 MeV to 1 GeV lattice, isochronous to better than ± 1 percent. This paper reports on simulations of recent lattice designs incorporating 3D space charge effects.

TUO1A03

Space Charge Effects in Isochronous FFAGs and Cyclotrons

space-charge, focusing, TRIUMF, simulation

231

T. Planche, R.A. Baartman, Y.-N. Rao
TRIUMF, Vancouver, Canada

Effects of space charge forces on the beam dynamics of isochronous rings will be discussed. Two different kinds of phenomena will be introduced through a brief review of the literature on the topic. The first one is a consequence of the very weak vertical focusing found in the low energy region of most cyclotrons. The space charge tune shift further reduces the vertical focusing, setting an upper limit on instantaneous current. The second one arises from the fact that longitudinal phase space is frozen in isochronous rings. This leads to effects of space charge forces which are very peculiar to isochronous machines. We will finally present the simulation tools being developed at TRIUMF to study these effects.

Slides TUO1A03 [0.974 MB]

WEO3A03

Extraction, Transport and Collimation of the PSI 1.3 MW Proton Beam

target, proton, extraction, neutron

373

D. Reggiani
PSI, Villigen PSI, Switzerland

With an average operating beam power of 1.3 MW the PSI proton accelerator complex is currently leading the race towards the high intensity frontier of particle accelerators. This talk gives an overview of the extraction of the 590 MeV beam from the ring cyclotron and its low loss transport to the meson production targets M and E as well as to the SINQ spallation neutron source. Particular regard is given to the collimator system reshaping the beam which leaves the 40 mm thick graphite target E before reaching SINQ. Since 2011, up to 8 second long beam macro-pulses are regularly diverted to the new UCN spallation source by means of a fast kicker magnet. The switchover from the SINQ to the UCN beam line as well as the smooth beam transport up to the UCN spallation target constitute the subject of the last part of the talk.

Slides WEO3A03 [2.728 MB]

THO1C01

High Intensity Operation and Control of Beam Losses in a Cyclotron Based Accelerator

target, extraction, proton, neutron

555

M. Seidel, J. Grillenberger, A.C. Mezger
PSI, Villigen PSI, Switzerland

This presentation discusses aspects of high intensity operation in PSI's cyclotron based proton accelerator (HIPA). Major beam loss mechanisms and tuning methods to minimize losses are presented. Concept and optimization of low loss beam extraction from a cyclotron are described. Collimators are used to localize beam losses and activation. Activation levels of accelerator components are shown. An overview on instrumentation for loss monitoring and prevention of failure situations is given. Other relevant aspects include the beam trip statistics and grid to beam power conversion efficiency.

Slides THO1C01 [3.642 MB]