Development of a Beam Profile Monitor/Time of Flight setup for HISPEC/DESPEC for FAIR

The Helmholtz Gesellschaft fur Schwerionenforschung GmbH will be expanded by the Facility for Antiproton and Ion Research in upcoming years. Different, international collaborations have been formed in order to effectively use the accelerator facilities, which will become available. The collaboration Nuclear Structure, Astrophysics and Reactions deals with the usage of high energetic, radioactive ion beams for nuclear physics experiments. During such experiments it is possible to slow down these ions to energies of 5 to 10 MeV/u to open certain reaction channels. A problem with the slowing down is the introduction of additional energy and spatial straggling as well as a further fragmentation of the original ion beam. To be able to nevertheless select the desired ion, an additional detector is needed directly after the slowing down and before the target. Within the framework of this thesis, such a detector system has been developed and tested. One demand to such a system is a largest possible transparency, not to degrade or even stop the ion beam, which is to be examined. As a solution a design on the basis of an emissive foil has been chosen. Thereby electrons will be emitted out of a thin foil if passed by an ion. These so-called secondary electrons are then accelerated and confined by an electrostatic top-assembly towards the proper detector head where they are position sensitively registered. In this way the ions can be detected indirectly. Using two of such units, the flight path of a single ion can be reconstructed and discriminated against other kinds of ions, additionally. A first prototype was built and continuously developed further. By measurements with radioactive sources its efficiency, spatial and timing resolution was tested. The insights gained therefrom were used to develop a second prototype. With regards to the future use, an as compact as possible, integrated design has been focused on. To investigate the second prototype, a dedicated beamline for detector tests and the simulation of slowed down beams was built at the Cologne FN tandem accelerator. This testbed is open to the collaboration and has already been used successfully.

[1]  D. Sillou,et al.  Development of micro-channel plates on a basis of aluminum oxide , 2006 .

[2]  Orin I. Dahl,et al.  Approximations to multiple Coulomb scattering , 1991 .

[3]  Schramm,et al.  Secondary-electron yield as a probe of preequilibrium stopping power of heavy ions colliding with solids. , 1989, Physical review. A, General physics.

[4]  D. Evans.  Low Energy Charged Particle Detection using the Continuous Channel Electron Multiplier , 1965 .

[5]  J. Wiza.  Microchannel plate detectors , 1979 .

[6]  B. Rubio.  DECAY SPECTROSCOPY (DESPEC) AT THE NEW FAIR-NUSTAR FACILITY , 2006 .

[7]  O. Odland,et al.  A FAST POSITION SENSITIVE MICROCHANNEL PLATE DETECTOR FOR RAY-TRACING OF CHARGED PARTICLES , 1996 .

[8]  S. Gales.  Towards the next generation of radioactive ion beam facilities , 2003 .

[9]  W. G. Davies,et al.  Energy loss of heavy ions at high velocity , 1994 .

[10]  Christopher D. Martin,et al.  WEDGE-AND-STRIP ANODES FOR CENTROID-FINDING POSITION-SENSITIVE PHOTON AND PARTICLE DETECTORS. , 1981 .

[11]  R. Gernhäuser,et al.  The Super-FRS project at GSI , 2003 .

[12]  Niels Bohr,et al.  The penetration of atomic particles through matter , 1948 .

[13]  E. J. Sternglass,et al.  Theory of Secondary Electron Emission by High-Speed Ions , 1957 .

[14]  M. Lindroos.  REVIEW OF ISOL-TYPE RADIOACTIVE BEAM FACILITIES , 2004 .

[15]  G. Münzenberg.  The separation techniques for secondary beams , 1992 .

[16]  S. Heinze,et al.  A new beam profile monitor and time of flight system for CologneAMS , 2013 .

[17]  S. Heinze,et al.  Evidence for a smooth onset of deformation in the neutron-rich Kr isotopes. , 2012, Physical review letters.

[18]  Dieter Ackermann,et al.  The large-area micro-channel plate entrance detector of the heavy-ion magnetic spectrometer PRISMA , 2005 .

[19]  James F. Pearson,et al.  MICROCHANNEL PLATE OPERATION AT HIGH COUNT RATES : NEW RESULTS , 1996 .

[20]  M. L. Lampton,et al.  High resolution delay line readouts for microchannel plates , 1991 .

[21]  A. Mrigakshi.  Study and test of micro-channel plates used in the dual ion spectrometer of the MMS mission by NASA , 2008 .

[22]  H. Bethe.  Bremsformel für Elektronen relativistischer Geschwindigkeit , 1932 .

[23]  Dominic J. Ruggieri,et al.  Microchannel Plate Imaging Detectors , 1972 .

[24]  T. Glasmacher.  Intermediate-energy Coulomb excitation , 2001 .

[25]  K. Fong,et al.  The ISAC-II upgrade at TRIUMF - progress and developments , 2003, Proceedings of the 2003 Particle Accelerator Conference.

[26]  V. Highland,et al.  Some Practical Remarks on Multiple Scattering , 1975 .

[27]  Y. X. Wang,et al.  Nuclear Instruments and Methods in Physics Research Section B : Beam Interactions with Materials and Atoms , 2018 .

[28]  A. Hartmann,et al.  A high-resolution time-of-flight spectrometer with tracking capabilities for fission fragments and beams of exotic nuclei , 2008 .

[29]  S. Gales.  SPIRAL2 at GANIL: Next Generation of ISOL Facility for Intense Secondary Radioactive Ion Beams , 2010 .

[30]  D. Rudolph,et al.  A new simulation package to model detector systems with fragmentation reactions and ion separators: Application to the LYCCA-0 system , 2009 .

[31]  C. Biedermann,et al.  Secondary electron yields from the entrance and exit surfaces of thin carbon foils induced by penetration of H+, H0 and H+2 projectiles (1.2 MeV/u)☆ , 1988 .

[32]  P. Armbruster,et al.  The recoil separator Lohengrin: Performance and special features for experiments , 1976 .

[33]  Z. Podolyák.  From RISING to HISPEC/DESPEC , 2008 .

[34]  D. Greiner,et al.  High resolution spectrometry for relativistic heavy ions , 1975 .

[35]  S. Lunardi,et al.  A compact time-zero detector for mass identification of heavy ions , 1982 .

[36]  R. Anholt,et al.  Calculation of K-vacancy production by relativistic projectiles , 1979 .

[37]  K. Oba,et al.  Characteristics of the Newly Developed MCP and Its Assembly , 1985, IEEE Transactions on Nuclear Science.

[38]  E. V. Prokhorova,et al.  The CORSET time-of-flight spectrometer for measuring binary products of nuclear reactions , 2008 .

[39]  J. E. Barth,et al.  Influence of the microchannel plate and anode gap parameters on the spatial resolution of an image intensifier , 2001 .

[40]  David Schiminovich,et al.  Multilayer anode with crossed serpentine delay lines for high spatial resolution readout of microchannel plate detectors , 1996 .

[41]  A. Villari.  First results at SPIRAL-GANIL , 2003 .

[42]  Krzysztof Piotr Rykaczewski,et al.  The GSI projectile fragment separator (FRS): A Versatile magnetic system for relativistic heavy ions , 1992 .

[43]  Bettina Lommel,et al.  The status of the Super-FRS in-flight facility at FAIR , 2008 .

[44]  J. Lapington,et al.  Spatial charge cloud distribution of microchannel plates , 1989 .

[45]  O. Jagutzki,et al.  Multiple hit read-out of a microchannel plate detector with a three-layer delay-line anode , 2001, 2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310).

[46]  Liam B. C. Worth,et al.  Position sensitive anodes for MCP read-out using induced charge measurement , 2002 .

[47]  Akira Goto,et al.  RI beam factory project at RIKEN , 2002 .

[48]  H. L. Ravn,et al.  Isolde ps booster facility at cern: Experiments with slow radioactive beams , 1993 .

[49]  G. Münzenberg,et al.  Reduction of energy dispersion on a parabola mass spectrometer , 1993 .

[50]  R.J.Dawson,et al.  ARIEL AND THE TRIUMF E-LINAC INITIATIVE, A 1⁄2-MW ELECTRON LINAC FOR RARE ISOTOPE BEAM PRODUCTION , 2008 .

[51]  F. Naqvi,et al.  Development of slowed down beams at the fragment separator for FAIR , 2011 .

[52]  Sorensen,et al.  Relativistic theory of stopping for heavy ions. , 1996, Physical review. A, Atomic, molecular, and optical physics.

[53]  R. Abiad,et al.  High resolution cross strip anodes for photon counting detectors , 2003 .

[54]  Fred S. Goulding,et al.  Identification of Nuclear Particles , 1975 .