Degrader 58 Ni Beam Fragments Target FRS: FRagment Separator at GSI Darmstadt, Germany One single beam: 58 Ni, with energy varying between.1 and 1.7 GeV/nucleon.

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Presentation transcript:

Degrader 58 Ni Beam Fragments Target FRS: FRagment Separator at GSI Darmstadt, Germany One single beam: 58 Ni, with energy varying between.1 and 1.7 GeV/nucleon. All fragments lighter than Ni are produced in the target, sorted out by the spectrometer (magnetic rigidity) and identified (Z,A,E) thanks to the detection system. Plan: different energies and EM angles, all elements (2<Z<26) dedicated runs with specific ions: C, Si, Fe (use of “degrader”) Issue: Synchronisation of two data streams Slide 1 GSI experiment (November 14-24,2003) EM 1st dipole pair2nd dipole pair

Goals of the GSI experiment C O Si Fe Eloss (MeV) Counts Determination of dL/dE as a function of (E,Z) Test of the algorithms for rejection of reaction events: heavy ions + lighter ions (alphas…) Test of the EM’s response to real, high-energy events (comparison with detectors fitted with good electronics) Goals: Side benefit: Simulated GCR Eloss distributions in orbit Slide 2

Birk’s formula: L(E)  E/(1+k B dE/dx) High energy: for a given dE/dx, E is higher for greater Z  more  electrons  less quenching exemple of functional: L(E)   E (1- X ln(1+X -1 )+ bAZ 2 ln((1+X)/(X+cA/E))) with X=a AZ 2 /E Quenching Effects: dL/dE NaI(Tl) Salamon and Ahlen lower limit at GSI upper limit at GSI Ganil Slide 3 “punchthrough point” “relativistic rise”

GANIL experiment (Easter 2003) 6 Si detectors2 CsI bars (hidden) E in CsI deduced from Eloss in Si (loss in wrapping foil taken into account) 73 MeV/nucleon 78 Kr+Au, Pb targets VERY PRELIMINARY results E estimated from Si Energy loss « no quenching » Effect of shaping time (0.5 –2 –6  s) also investigated Slide 4

Nuclear reactions: rejection Will be tested with GSI data: 1.7 GeV Fe will « punch » through the whole calorimeter at normal incidence. Rejection algorithms based on: E i /E i+1 ratios, significantly different from 1 (thresh: TBD) for reactions charge-changing (« stripping ») reactions: Z  Z-1:  E/E  1/Z = 4% for Fe presence of energy in neighboring crystals Numbers of identified reactions can be confronted with expected (= real!) values from empirical cross sections Simulations: JQMD, INC in GEANT4, Fluka? Slide 5

CERN-SPS experiment in 2003 (August 7-13) Goals:  precise measurement of longitudinal shower profile (~20 X 0 )  test of energy-reconstruction methods  investigation of crack effects (2 detector subsets)  investigation of the impact of direct energy deposit within photodiodes on position determination  determination of nuclear-reaction patterns (pion-induced reactions)  verification of CsI time constants Beams (H6a line) : electrons 6 GeV<E<150 GeV pions+muons Setup: « Cal »: at least 32 crystals (50 proposed by Sweden) trigger: 2cm x 2cm plastic scintillator position: Si strips (?) Slide 6

Slide MeV “sum” 511 keV CERN-SPS experiment in 2002 Good electronics Longitudinal shower profile (calibration with muons…) detector (2x4 CsI crystals) Pb

Slide 8 Transverse “shower profile” at 200 GeV