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Readout development for CALIFA

Readout development for CALIFA. Roman Gernhäuser, TU-München. Options and requirements. preamp MPR16-B digital readout (MWD, TOT) some ideas for the endcap work package. Detector concept. Barrel part: CsI(Tl) bright but slow – 65 000 photons/MeV – t = 0.68 (64%), 3.34 (36%) μs

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Readout development for CALIFA

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  1. Readout development for CALIFA Roman Gernhäuser, TU-München Options and requirements • preamp MPR16-B • digital readout (MWD, TOT) • some ideas for the endcap • work package R3B - meeting April 2010 @ GSI

  2. Detector concept Barrel part: CsI(Tl) bright but slow – 65 000 photons/MeV – t = 0.68 (64%), 3.34 (36%) μs APD sensors (B-field) Forward part: CsI(Tl) or phoswich + wavelength shifter……. high resolution large dynamic range 30MeV g / 300MeV p R3B - meeting April 2010 @ GSI

  3. MPR16-B rev.1 delivered 03.10 New development in collaboration of U- Madrid and Mesytec 1nF, dual range, T-HV regulator R3B - meeting April 2010 @ GSI

  4. WEB Based Slow Control R3B - meeting April 2010 @ GSI

  5. Little Test Setup 4 different crystals: 803, 804, 1 , 57 R3B - meeting April 2010 @ GSI

  6. Digital Test Electronics 16bit 100MHz, VME ADC R3B - meeting April 2010 @ GSI

  7. Raw Data with Pulser Range set to 30 MeV Spec. output 1.2V Max. output up to 6V R3B - meeting April 2010 @ GSI

  8. Moving Window Deconvolution Typ. Resolution DE = 16 keV @ 30MeV range R3B - meeting April 2010 @ GSI

  9. Connecting the APD R3B - meeting April 2010 @ GSI

  10. 137 Cs Source DE ~ 7% Trigger thr. not optimized Test with Eu source? R3B - meeting April 2010 @ GSI

  11. Calibration and Linearity Linearity is ok even outside specified range! R3B - meeting April 2010 @ GSI

  12. ln(E) THR t (E) Simple TOT - Method E = THR *exp(t/t) DE/E = Dt / t DE/E ~ 0.004 Dt = 200ns , t = 50ms A(t) = E exp(-t/t) Preamplifier signal tot ~ t [ln (E) – ln(THR)] Dtot = const range Needs up to a ms to recover from a particle R3B - meeting April 2010 @ GSI

  13. TOT Tests Nice log behavior in linear range Degrading signal with larger input We need a clipping amplifier stage ? R3B - meeting April 2010 @ GSI

  14. 16 ch ADC (HADES) Diploma Student (Michael Bendel) started in Jan. 2010 MWD - moving window deconvolution Internal module trigger Different Algorithms For different tasks trigger data TRB net Hub for 16 fibers GBit - interface Adapter board for MPR-B Test algorithm using 12, 14, 16 bits Lots of VHDL programming R3B - meeting April 2010 @ GSI

  15. CsI(Tl) Properties scintillation efficiency decreases with increasing ionization density scintillation efficiency depends on – particle type – energy - non-linear response t1 = 700ns (64%) t2 = 3.3 ms (36%) depend on temperature and ionization density Problem with ballistic deficit? R3B - meeting April 2010 @ GSI

  16. Fast and Slow Components ratio depends on ionization density and particle velocity. INDRA data for stopped particles Might be more pronounced for passing through particles Rough measurement of total energy J. Pouthas (1994) R3B - meeting April 2010 @ GSI

  17. Acryl BC400 CsI(Tl) APD Another type of Phoswich thin Plastic scintíllator optimized light guide Large difference of rise times no ambiguities for different path length 10mm 120mm 20mm R3B - meeting April 2010 @ GSI

  18. APD development Contact to laser components, Meeting with developers from Texas University Only solution is reverse technology like H8664-1010 Some interesting aspects to minimize leakage currents Plan: 2 x 10x10mm in one chip R3B - meeting April 2010 @ GSI

  19. Task List • Detector Development • Test velocity resolution of t analysis in CsI(Tl) • Build prototype of plastic phoswich ??. • Put money into APD development to get APDs cheaper • Preamplifier Development • Adjust dynamic range • Check linearity of TOT method • Check temperature compensation • Readout Development • Test influence of 12 bit ADC • Produce MPR-B to ADC adapter board • move from C++ to VHDL • Test advantages of Kalmann filter R3B - meeting April 2010 @ GSI

  20. R3B (Reactions with Relativistic Radioactive Beams) Setup Dp/p ~ 10-4 @ 2.5% accept. Measurement of all kinematic variables in a HI reaction Different tasks: High resolution tracking in the super FRS, radiation hard (SFRS) 106 cm-1 s-1 2 x TOF (SFRS – target) (reaction products) low material budget R3B - meeting April 2010 @ GSI

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