Brandau, C.

Davinson, T.

Glorius, J.

Gumberidze, A.

Heil, M.

Kozhuharov, C.

Litvinov, Yury

Meister, M.

Müller, A.

Reifarth, R.

Sanjari, S.

Schippers, S.

Stöhlker, Thomas

Trageser, C.

Woods, P.

GSI Repository

Innovative Concepts for Collision Studies at GSI’s and FAIR’s Storage Rings∗C. Brandau1,2,4, J. Glorius2,3, C. Trageser1,4, R. Reifarth3, M. Heil2, A. Mu¨ller4, A. Gumberidze1,2,C. Kozhuharov2, Yu.A. Litvinov2,6, M. Meister2, S. Sanjari1,2, S. Schippers4, T. Sto¨hlker2,7,8,T. Davinson5, and P. Woods51EMMI/FIAS, Darmstadt; 2GSI, Darmstadt; 3Universita¨t Frankfurt; 4Universita¨t Gießen; 5University of Edinburgh;6MPIK, Heidelberg; 7Helmholtz-Institut Jena; 8Universita¨t JenaInstallation of two new detector manipulators inthe dipoles of the ESRTwo prototype systems of a new particle detector manip-ulator ([1], and Fig. 1) are currently being installed in theESR’s first dipole magnets in the south and the north arc,i.e., behind the electron cooler and the gas-target, respec-tively. The manipulators are equipped with vacuum gatevalves and vacuum pumps and can thus be separated com-pletely from the main vacuum system of the storage ring.The present design is especially adapted for the installationof detectors at the last ports of the C-type dipole magnets.The set-up in the south arc behind the electron cooler fea-tures a detector pocket with an entrance window of 25 μmthickness and is primarily targeted at recombination stud-ies with a stochastically cooled ion beam using the electroncooler solely as a target for free electrons (cf. e.g. [2]).In the north arc a special detector mount is installed thatallows for the placement of a detector in-vacuum on the in-side of the ring. As a consequence of the C-type magnetdesign, the detector has to be inserted from the outside ofthe ring prior to beam injection leaving sufficient space forthe circulating initially uncooled primary beam.The main purpose of this set-up is to enable nuclear reac-Figure 1: New detector manipulator in the first dipole mag-net of the south arc (behind the electron cooler) of the ESR.tion studies at the internal gas-target at ion energies aroundthe Coulomb barrier or around the Gamov window such asnuclear astrophysics (p,γ) experiments [3]. A new UHVcompatible position sensitive ceramic-mounted Si-detector∗Work is supported by BMBF (contracts 06GI911I and06GI7127/05P12R6FAN), by the Alliance Program of the HelmholtzAssociation (HA216/EMMI), by the HGF Young Investigators ProjectVH-NG-327 and by HIC for FAIR.(Micron semiconductors) is delivered, was vacuum testedat GSI and will be mounted in the near future. Commis-sioning of the manipulators with beam and first (p,γ) datataking runs at the ESR are scheduled for the upcomingbeamtimes spring/summer 2014.A new data acquisition for the integration ofSchottky signals in AP experimentsIn a collaboration of Giessen University, EMMI andGSI a new data acquisition is presently being set-up thataims at the continuous and broadband recording of RFSchottky signals at the present ESR, and in perspectiveat FAIR’s future storage rings. In addition to the well-established Schottky mass and decay studies (cf. e.g. [4])it is envisaged to provide a transparent, seamless and non-destructive recording of ion beam parameters (’beam log-book’) and supply the data for storage ring experiments.The DAQ system comprises a modular PXIe crate and cor-responding modules (National Instrument VSA type NI-5663E and Counter NI-6602, additional digitizer SPDe-vices ADQ-214) and is capable of uninterrupted high-resolution recording of the full ring momentum acceptance.The DAQ records the Schottky signals of both, the oldparallel plate pick-up and the new high-resolution cavity-based pick-up [5] simultaneously. In particular, the singleparticle sensitivity of the new resonant pick-up features amuch improved time-resolution. The combination of bothpick-ups with the new highly performant DAQ will also fa-cilitate new experimental schemes for atomic and nuclearcollsion studies at storage rings [6].The system is presently being commisioned offline withtest signals: an initial data taking software (using NI Lab-view) and first data analysis routines have already beenimplemented. Tests and optimizations with beams areplanned for the course of 2014.References[1] C. Brandau et al., GSI annual report 2012, p. 327.[2] D. Bernhardt et al., Phys. Rev. A 783 (2011), 020701.[3] Q. Zhong, et al., J. Phys: Conf. Ser. 202 (2010), 012011.[4] Yu.A. Litvinov and F. Bosch, Rep. Prog. Phys. 74 (2011),016301.[5] F. Nolden et al., Nucl. Instrum. Meth. A (2011) 659, 69.[6] C. Trageser et al., 11th ECAMP, Aarhus, Denmark, 24.-28.6.2013.PNI-AP-04 GSI SCIENTIFIC REPORT 2013160 doi:10.15120/GR-2014-1-PNI-AP-04

Innovative Concepts for Collision Studies at GSI's and FAIR's Storage Rings

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Innovative Concepts for Collision Studies at GSI's and FAIR's Storage Rings

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