The low-pressure focal plane detector of the MAGNEX spectrometer

The focal plane detector of the MAGNEX large acceptance magnetic spectrometer is presented. It is based on a large low-pressure gas-filled tracker followed by a wall of silicon detectors to stop the particles. It has been designed for the stringent requirements from the ion optics and the foreseen use with heavy ions. The performances of the device are demonstrated using 4MeV/u oxygen beams. The results of the tests are described and discussed in view of the application of the particle identification and trajectory reconstruction techniques to recover the kinematic properties of the reaction products. They demonstrate the suitability of such detector in a wide range of experiments where low-energy thresholds, large-accepted solid angle, precise momentum measurement and good particle identification are needed.

[1]  T. H. Braid,et al.  An ionization-chamber type of focal-plane detector for heavy ions☆ , 1976 .

[2]  Xuesong Zhou,et al.  Advanced focal plane detector with improved particle identification , 1999 .

[3]  J. Harvey,et al.  DESIGN OF GRID IONIZATION CHAMBERS , 1949 .

[4]  A. Cunsolo,et al.  A particle identification technique for large acceptance spectrometers , 2010 .

[5]  J. Pancin,et al.  Performance of the improved larger acceptance spectrometer: VAMOS++ , 2011 .

[6]  Martin Berz,et al.  COSY INFINITY version 8 , 1999 .

[7]  J. Yurkon,et al.  Focal plane detector for the S800 high-resolution spectrometer , 1999 .

[8]  A. Cunsolo,et al.  Digital Pulse Shape Acquisition From the Focal Plane Detector of MAGNEX Spectrometer , 2008, IEEE Transactions on Nuclear Science.

[9]  A. Cunsolo,et al.  Technique for 1st order design of a large-acceptance magnetic spectrometer , 2002 .

[10]  K. Lau,et al.  Optimization of centroid finding algorithms for cathode strip chambers , 1995 .

[11]  Danilo Rifuggiato,et al.  Radioactive ion beam facilities at INFN LNS , 2011 .

[12]  H. Ikezoe,et al.  JAERI magnetic spectrograph for heavy-ion research , 1981 .

[13]  A. Cunsolo,et al.  Transport efficiency in large acceptance spectrometers , 2011 .

[14]  W. Mittig,et al.  Performance of VAMOS for reactions near the Coulomb barrier , 2008 .

[15]  L. Bianchi,et al.  SPEG: AN ENERGY LOSS SPECTROMETER FOR GANIL , 1989 .

[16]  C. Boiano,et al.  Wide-dynamic-range fast preamplifier for pulse shape analysis of signals from high-capacitance detectors , 2004, IEEE Transactions on Nuclear Science.

[17]  A. Cunsolo,et al.  Preliminary Study of Two‐Neutron States via the (18O,16O)Reaction at 84 MeV , 2011 .

[18]  F. Cappuzzello,et al.  Measuring the ions momentum vector with a large acceptance magnetic spectrometer , 2011 .

[19]  J. Sida,et al.  CATS, A LOW PRESSURE MULTIWIRE PROPORTIONNAL CHAMBER FOR SECONDARY BEAM TRACKING AT GANIL , 1999 .

[20]  D. Pereira,et al.  Nuclear rainbow in the 16O + 27AL system: The role of couplings at energies far above the barrier , 2012 .

[21]  F.L.H. Wolfs,et al.  A focal plane detector for reactions with medium weight projectiles , 1988 .

[22]  A. Latina,et al.  The focal plane detector of the magnetic spectrometer PRISMA , 2005 .

[23]  F. Cappuzzello,et al.  Universal algorithm for the analysis of charge distributions in segmented electrodes of gas detectors , 2012 .

[24]  A. Cunsolo,et al.  Ion optics for large-acceptance magnetic spectrometers: application to the MAGNEX spectrometer , 2002 .

[25]  E. Farnea,et al.  Response function of the magnetic spectrometer PRISMA , 2011 .

[26]  B. Schmidt,et al.  Drift properties of electrons in methane and methane noble gas mixtures , 1986 .

[27]  A. Cunsolo,et al.  A low-pressure gas detector for heavy-ion tracking and particle identification , 2002 .

[28]  M. Berz,et al.  Field reconstruction in large aperture quadrupole magnets , 2009 .

[29]  A. Cunsolo,et al.  Field measurement for large bending magnets , 2008 .

[30]  A. Cunsolo,et al.  Field measurement for large quadrupole magnets , 2008 .

[31]  M. Uchida,et al.  High resolution beam line for the Grand Raiden spectrometer , 2002 .

[32]  H. Sakai,et al.  The high resolution SHARAQ spectrometer , 2008 .

[33]  D. G. Lewis,et al.  Focal plane detector for the Oxford MDM-2 spectrometer , 1986 .

[34]  G. Charpak,et al.  High-accuracy localization of minimum ionizing particles using the cathode-induced charge centre-of-gravity read-out , 1979 .

[35]  D. Pereira,et al.  Challenging measurement of the 16O+27Al elastic and inelastic angular distributions up to large angles , 2011 .

[36]  A. Cunsolo,et al.  Field simulations for large dipole magnets , 2007 .

[37]  H. A. Enge,et al.  Magnetic spectrographs for nuclear reaction studies , 1979 .

[38]  S. Hoath,et al.  Construction and performance of a multiparameter focal plane detector for use on a QMG/2 magnetic spectrometer , 1985 .

[39]  K. Assamagan,et al.  TIME-ZERO FISSION-FRAGMENT DETECTOR BASED ON LOW-PRESSURE MULTIWIRE PROPORTIONAL CHAMBERS , 1999 .

[40]  A. Cunsolo,et al.  New structures in the continuum of 15C populated by two-neutron transfer , 2012 .