IPAC2013 - List of Authors (Steck, M.)

Paper	Title	Page
MOPEA013	Radioactive Beam Accumulation for a Storage Ring Experiment with an Internal Target	91
	F. Nolden, C. Dimopoulou, R. Grisenti, C.M. Kleffner, S.A. Litvinov, W. Maier, C. Peschke, P. Petri, U. Popp, M. Steck, H. Weick, D.F.A. Winters, T. Ziglasch GSI, Darmstadt, Germany
	A radioactive ⁵⁶Ni beam was successfully accumulated for an experiment with an internal hydrogen target at the storage ring ESR of GSI, Germany. The radioactive beam was produced and separated at the GSI fragment separator from a stable ⁵⁸Ni beam. About 6·10⁴ ⁵⁶Ni ions were injected into the ESR on a high relative momentum orbit. The beam was subjected to stochastic cooling, bunched and transported to a low relative momentum orbit where it was neither disturbed by the field of the partial aperture injection kicker nor by the fields of the stochastic cooling kickers. Slightly below this deposition momentum, the beam was accumulated and continuously cooled by means of electron cooling. For each experiment with internal hydrogen target, about 80 shots were injected consecutively, leading to a stored beam of roughly 5·10⁶ particles.

MOPEA017	Electron Cooling of Heavy Ions Interacting with Internal Target at HESR of FAIR	103
	T. Katayama, M. Steck GSI, Darmstadt, Germany R. Maier, D. Prasuhn, H. Stockhorst FZJ, Jülich, Germany
	The High Energy Storage Ring (HESR) is designed and optimized to accumulate and store the anti-proton beam for the internal target experiment. The recent demand of atomic physics has impacted to use the HESR facility also as the storage ring of bare heavy ions. In this concept the bare heavy ions are injected at 740 MeV/u from the Collector Ring where the ions are well stochastically cooled to be matched with HESR ring acceptance. In the HESR the 2 MeV electron cooler is prepared with the maximal electron current of 3 A and the cooling length of 2.7 m. The electron cooling process of typically ²³⁸U⁹²⁺ beam is simulated for the Hydogen and Xe internal target with simultaneous use of barrier voltage to compensate the mean energy loss caused by the interaction with internal target. In the present report the detailed simulation results of 6D phase space obtained by the particle tracking code are precisely discussed.

TUPWO006	Orbit Correction System at the Collector Ring	1886
	A. Dolinskyy, O. Chorniy, O.E. Gorda, A.G. Kalimov, H. Leibrock, S.A. Litvinov, M. Steck GSI, Darmstadt, Germany
	The CR is dedicated ring for cooling of hot beam coming either from the antiproton separator or SFRS. It is anticipated that the understanding and control of the beam orbits will be important for achieving low beam losses. We describe our plans for measuring and correcting the COD of the CR. The closed orbit of the CR, which is distorted due to magnets misalignments, can reduce the ring acceptance by factor of 2, if a special correction system is not applied. The system, which is developed for the CR should be periodically or manually invoked to correct the global closed orbit and used to adjust the orbit position at some point using local bump. BPM and corrector magnets, which are planned to be used at the CR, are described in this paper. SVD method is used to obtain the corrector strength or corrector factors in global or local orbit correction.

WEPEA009	Effects of Field Imperfections in the Isochronous Mode of the CR Storage Ring at FAIR	2510
	S.A. Litvinov, A. Dolinskyy, O.E. Gorda, M. Steck, H. Weick GSI, Darmstadt, Germany D. Toprek VINCA, Belgrade, Serbia
	Today the challenge is to measure masses of exotic nuclei up to the limits of nuclear existence which are characterized by low production cross-sections and short half-lives. The large acceptance Collector Ring (CR) at FAIR tuned in the isochronous ion-optical mode offers unique possibilities for such measurements. Nonlinear field errors as well as fringe fields of the wide aperture quadrupoles and dipoles strongly excite the high-order aberrations which negatively affect the time resolution of the isochronous ring. Their influence is investigated here and a possible correction scheme is shown.

Paper

Title

Page

Radioactive Beam Accumulation for a Storage Ring Experiment with an Internal Target

91

F. Nolden, C. Dimopoulou, R. Grisenti, C.M. Kleffner, S.A. Litvinov, W. Maier, C. Peschke, P. Petri, U. Popp, M. Steck, H. Weick, D.F.A. Winters, T. Ziglasch
GSI, Darmstadt, Germany

A radioactive ⁵⁶Ni beam was successfully accumulated for an experiment with an internal hydrogen target at the storage ring ESR of GSI, Germany. The radioactive beam was produced and separated at the GSI fragment separator from a stable ⁵⁸Ni beam. About 6·10⁴ ⁵⁶Ni ions were injected into the ESR on a high relative momentum orbit. The beam was subjected to stochastic cooling, bunched and transported to a low relative momentum orbit where it was neither disturbed by the field of the partial aperture injection kicker nor by the fields of the stochastic cooling kickers. Slightly below this deposition momentum, the beam was accumulated and continuously cooled by means of electron cooling. For each experiment with internal hydrogen target, about 80 shots were injected consecutively, leading to a stored beam of roughly 5·10⁶ particles.

MOPEA017

Electron Cooling of Heavy Ions Interacting with Internal Target at HESR of FAIR

103

T. Katayama, M. Steck
GSI, Darmstadt, Germany
R. Maier, D. Prasuhn, H. Stockhorst
FZJ, Jülich, Germany

The High Energy Storage Ring (HESR) is designed and optimized to accumulate and store the anti-proton beam for the internal target experiment. The recent demand of atomic physics has impacted to use the HESR facility also as the storage ring of bare heavy ions. In this concept the bare heavy ions are injected at 740 MeV/u from the Collector Ring where the ions are well stochastically cooled to be matched with HESR ring acceptance. In the HESR the 2 MeV electron cooler is prepared with the maximal electron current of 3 A and the cooling length of 2.7 m. The electron cooling process of typically ²³⁸U⁹²⁺ beam is simulated for the Hydogen and Xe internal target with simultaneous use of barrier voltage to compensate the mean energy loss caused by the interaction with internal target. In the present report the detailed simulation results of 6D phase space obtained by the particle tracking code are precisely discussed.

TUPWO006

Orbit Correction System at the Collector Ring

1886

A. Dolinskyy, O. Chorniy, O.E. Gorda, A.G. Kalimov, H. Leibrock, S.A. Litvinov, M. Steck
GSI, Darmstadt, Germany

The CR is dedicated ring for cooling of hot beam coming either from the antiproton separator or SFRS. It is anticipated that the understanding and control of the beam orbits will be important for achieving low beam losses. We describe our plans for measuring and correcting the COD of the CR. The closed orbit of the CR, which is distorted due to magnets misalignments, can reduce the ring acceptance by factor of 2, if a special correction system is not applied. The system, which is developed for the CR should be periodically or manually invoked to correct the global closed orbit and used to adjust the orbit position at some point using local bump. BPM and corrector magnets, which are planned to be used at the CR, are described in this paper. SVD method is used to obtain the corrector strength or corrector factors in global or local orbit correction.

WEPEA009

Effects of Field Imperfections in the Isochronous Mode of the CR Storage Ring at FAIR

2510

S.A. Litvinov, A. Dolinskyy, O.E. Gorda, M. Steck, H. Weick
GSI, Darmstadt, Germany
D. Toprek
VINCA, Belgrade, Serbia

Today the challenge is to measure masses of exotic nuclei up to the limits of nuclear existence which are characterized by low production cross-sections and short half-lives. The large acceptance Collector Ring (CR) at FAIR tuned in the isochronous ion-optical mode offers unique possibilities for such measurements. Nonlinear field errors as well as fringe fields of the wide aperture quadrupoles and dipoles strongly excite the high-order aberrations which negatively affect the time resolution of the isochronous ring. Their influence is investigated here and a possible correction scheme is shown.