52th International Winter Meeting on Nuclear Physics, January 28, 2014, Bormio Andrej Kugler for the HADES collaboration.

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Presentation transcript:

52th International Winter Meeting on Nuclear Physics, January 28, 2014, Bormio Andrej Kugler for the HADES collaboration

2 Outline Physics motivation for ECAL Simulations of the detector Calorimeter module Module + PMT’s tests LED driven control /calibration Front-end electronics Summary

Phys. Lett. B 663 (2008) 43 Phys.Rev. Lett 98(2007) Phys. Rev. C84(2011) Normalization: N  = ½ (N  + N  ),    from the same data sample -Systematic errors: ~25%,  M  = 9% -“hadronic cocktail”: thermal source, only long-lived components included, i.e.    : TAPS data,  : m  scaling. R. Averbeck et. al. PRC 67 (2003) I. Froehlich et al.,arXiv: HADES: EuroPhys.Journal A40, 45 (2009) ] Compressed matter mystery: Excess above eta contribution HADES observed: excess of pair yield above  -contribution established excess in CC scales with E beam like π production! ~ A part excess in First chance collision is very slightly below CC significant increase of excess in ArKCl ~ (Apart ) 1.4 hinting at Δ resonance decays

p+p 3.5 GeV EPJA R1 (2012) 4 HADES physics High Acceptance DiElectron Spectrometer studies in-medium modifications by measuring dielectrons strangeness measurements ϕ, K +/-, Ξ(1321) … We studied proton, pion and nucleus induced reactions at SIS18/Bevalac energies and plan to continue these studies at SIS100

Germany 100 m UNILAC SIS 18 SIS 100/300 HESR Super FRS NESR CR RESR FLAIR Module 0:Heavy-Ion Synchrotron SIS100 Module 1:HADES/CBM, APPA, and detector calibration Module 2:Super-FRS → RIB for NUSTAR. Module 3:Antiproton facility for PANDA CBM HADES setup installed at GSI SIS 18 six identical sectors almost full azimuthal angle polar angle 18° - 85° high rate counting ECAL detector planned for SIS modules of lead glass + photomultiplier polar angle 12° - 45° novel electronic for read out

6 Simulation of the full detector setup Module occupancy in 8 GeV 0 implemented in HGeant code (GEANT3 based framework of HADES collaboration) simulation of lead glass response split to: shower development in a module transport of the Cherenkov photons look-up table approach used for Cherenkov photon to fasten the calculation Diphoton invariant mass spectra in 8 GeV

7 Calorimeter module 1.5 inch EMI 9903KB 650 pieces from MIRAC experiment (WA98 hadron calorimeter) Glass properties: chemical composition: SiO2 -39%,PbO – 55%, K2O - 2%, Na2O – 3%) density: 4.o6 g/cm 3 radiation length (X 0 ): 2.51 cm refractive index: (at 400 nm) Moliére radius: 3.6 cm totally needed 978 pieces lead glass on loan from end cap calorimeter of OPAL experiment lead glass type: CEREN 25 dimensions 92 x 92 x 420 mm wrapped in TYVEK paper brass can 0.45 mm thick

Quality control by exploiting Cosmic muons 1.5 inch photomultiplier (EMI 9903KB) Same shaper (shaper calibration not included!) 8

Setup for measurement with cosmic muons 9 -two such setups currently available, third is under construction -all assembled modules will be calibrated using cosmic muons Cosmic muons: energy ~ 2 GeV energy deposit in module ~ 200 MeV Cherenkov light output corresponds to ~ 577 MeV electrons count rate ~20 particles / hour

10 Test with Photon Beam at Mainz -used tagger to select 8 known gamma energies -8 different trigger signals – 8 energies measured in one measurement -beam collimated by Ø 2 mm lead collimator placed 1.5 meters upstream -beam size in front of the modules ~ 6 mm

11 Energy leakage into neighbour module I Sum of triggers 27 mm from junction Measured in January 2014 Used 3 inch PMT rotated by 6° rotated by 12° Sum of triggers 27 mm from junction Sum of triggers 27 mm from junction

12 Energy leakage into neighbour module II Measured in January 2014 Used 3 inch PMT 461 MeV 1218 MeV Sum of deposited energy in VH3 and VH6 modules Deposited energy in VH3 module PRELIMINARY

13 Relative energy resolution Resolution [%] 1inch Ham. 1.5inch EMI 3inch Ham. measured with CAEN ADC, signal shaped by MA8000 shaper Energy resolution behind the names of modules is for 1 GeV photon... PRELIMINARY

14 Pion Beam at CERN test (PS synchrotron – T10 line) Purpose: evaluate electron/pion separation and measure time resolution Used: secondary π - beam of 0.4 – 6 GeV/c with admixture of e - e - /  - separation factor Measured: time resolution of 215 ps for 800 MeV e - energy resolution 6.9% for 1 GeV e - (worse than expected 6% based on  measurement…caused mainly by tailing of e - peaks) Measured in May 2010 Used EMI photomultipliers

LED light system for calibration and stability monitoring 15 First prototype (6/2012) Fiber to lead glass transition Second prototype (3/2013) LED based system is being developed for calibration and stability monitoring of ECAL modules

16 Detector response & requirements on electronics Signal parameters Rise time3 ns Fall time50 ns S/N ratio> 12.5 Pulse amplitude at 20 MeV50 mV Pulse amplitude at 600 MeV1.5 V Expected hit rate10 kHz / channel Read-out parameters Time resolution< 500 ps Dynamic range energy50 mV – 5 V Energy measurement accuracy5 mV Final energy resolution5%/sqrt(E), E in GeV

17 Read-out systems Data taken by four different readout systems: CAEN adc – referential one Rhode&Schwarz oscilloscope “Cracow” front-end board + TRB2 PaDiWa Amps + TRB3

Time schedule 18 Status May 2013

Summary Motivation: Improved dilepton spectroscopy by HADES – lepton and photon pairs at the same time Current status: ~150 modules assembled, ~70 modules measured in detail Significant leakage of shower in neighbour module even at moderate photon energy 1.5 and 3 inch photomultipliers successfully tested, usage of 1 inch photomultiplier is under investigation Mechanical construction designed, simulations performed, software for read-out prepared prototype of LED based monitoring system proven Three solutions for front-end electronic tested TDR updated and submitted to FAIR management Plans: Finish front-end electronic development Build the detector 19

Acknowledgements The ECAL workgroup: Bratislava, Slovakia, Institute of Physics, Slovak Academy of Sciences S. Hlaváč Cracow, Poland, Institute of Technology W. Czyžycki, E. Lisowski Cracow, Poland, Smoluchowski Institute of Physics, Jagiellonian University of Krak w M. Kajetanowic, P. Salabura Darmstadt, Germany, GSI Helmholtzzentrum für Schwerionenforschung GmbH W. K ̈onig, J. Pietraszko, M. Traxler Darmstadt, Germany, Institut für Kernphysik, Technische Universität T. Galatyuk, A. Rost Frankfurt, Germany, Institut für Kernphysik, Goethe-Universität C. Blume, B. Kardan Moscow, Russia, Institute for Nuclear Research of Russian Academy of Sciences (INR) M. Golubeva, F. Guber, A. Ivashkin, O.Petukhov, A. Reshetin Munich, Germany, Excellence Cluster Universe, Technische Universität München E. Epple, L. Fabbietti, K. Lapidus Řež, Czech Republic, Nuclear Physics Institute, Academy of Sciences of Czech Republic A. Kugler, P.Ramos, Y. Sobolev, O. Svoboda, P. Tlustý 20

21 Backup slides

22 Assembly of modules with 3 inch photomultipliers Hamamatsu R6091 special fiber type for blue light otherwise standard technology

Electronic tests using LED system 23 LED system is very useful for detector development – fast test of all the chain PMTs+divider+frond-end board Gain linearity of the electronics Energy resolution

Front-end electronic – Cracow design 24 8 input channels Signal split into two paths:  Fast path: fast discriminator for time measurement  Slow path: signal integrated for amplitude measurement Differential LVDS output Discriminator threshold for each channel via slow control lines ADC and TDC done by TRBv3 boards Different shaping time and gain tested Energy resolution with pulser: 0.6% at 100 ps time precision Energy resolution with LED-PMT signal: 3.6% at 150 ps time precision Amplitude signal ADC Time signal TDC Threshold setup Inputs ±5 GND

25 Charge measurement with FPGA Idea: Modified Wilkinson ADC Integrate input signal with a capacitor Discharge via current source -> fast crossing of zero Q2W: Measure time to reach zero ~Q using an FPGA-TDC COME & KISS design: keep it small and simple by using complex commercial elements Q2W prototype

26 New PADIWA-AMPS1 layout with Q2W (topside) Delivery end of September 2013