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Status of the Calorimeter Working group activities

Status of the Calorimeter Working group activities. GSI, 16 th October 2007. NUSTAR CALORIMETER Working Group. Coordinator : D. Cortina R3B (D.Cortina) / EXL (J.A. Scarpaci) Created in : February 2005 after the NUSTAR collaboration

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Status of the Calorimeter Working group activities

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  1. Status of the Calorimeter Working group activities GSI, 16th October 2007

  2. NUSTAR CALORIMETER Working Group Coordinator : D. Cortina R3B (D.Cortina) / EXL (J.A. Scarpaci) Created in : February 2005 after the NUSTAR collaboration Goal: Find synergies between the different calorimeters in NUSTAR (R&D, Desing phase, but also common front to negociate with providers) List : 41 members, 21 Institutions , 10 countries, Meetings - February 2005 GSI, Darmstadt (Germany) - June 2005 Valencia (Spain) - Informal meeting , September 2005, Orsay (France) - September 2005 Santiago de Compostela(Spain) - February 2006, IPN Orsay (France) - September 2006, Krakow ( SPIRAL) *

  3. Last year activities • R3B/EXL collaboration working group, Milan October 2006 • CWG meeting, Nustar week, GSI March 2007 • Prototype definition videoconference, May 2007 • CWG meeting, Lund June 2007 • Working progress videoconference, September 2007 • CWG meeting, GSI October 2007 www.usc.es/genp/r3b  calorimeter

  4. Technical Proposal (2005) Large dynamical range for detecting p,g Inner radius ~ 30 cm ( house Si trackers) UHV compatible for EXL Affordable cost!!!

  5. Experimental constraints ECM = 10 MeV Gammas are emitted with energies up to Elab= 3.2 ECM (for β = 0.82 ~ 700 A. MeV) • A huge crystal length is required for full energy absorption (β = 0.82) The angular distribution of the emitted gammas is peaked in the forward direction. • allows a certain optimization of the angular coverage The forward angular region will be the most delicate part

  6. Calorimeter sectors Angular distribution Doppler shift BARREL ECM = 10 MeV β = 0.82 FORWARD ENDCUP

  7. R&D working group activities • General design studies (R3B) barrel: IPNO,USC forward endcup: IPNO,USC • R&D on Crystals and photosensors barrel: IPNO,USC, Lund forward endcup: Madrid • Simulations (R3B) full calorimeter : USC partial : Lund, Madrid

  8. R&D working group activities • Mechanical structure cell structure: IPNO,USC, TU-Vigo general mechanical support NN • Prototypes barrel: IPNO,USC, Lund forward endcup: Madrid • Electronics NN • Slow control and monitorisation NN

  9. General design: R3B Calorimeter models (CAD) v1.2 v4.0a v4.0c v4.0b USC, IPN

  10. General design: R3B Calorimeter models (CAD) v5.0 Last accepted version for the barrel design Inner radius 30 cm Few crystal shapes Garantees DE/E~ 3% (due to polar angular resolution) H. Alvarez, USC

  11. Crystal and photosensors !?

  12. R3B Calorimeter Target x 2.2T Magnet Beam axis 14° z 1450mm (0,0,0) Crystal and photosensors • BARREL • CsI(Tl) + PM IPNO ~300 Gauss at PM level  PROBLEM Good energy resolution Shielding needed to work with PM

  13. Crystal and photosensors CsI(Tl) + LAAPD USC Very good energy resolution Variation of APD gain with temperature monitorization needed

  14. Crystal and photosensors CsI(Tl) + PD LunD Moderate energy resolution Very high threshold  problem to register low energy gammas

  15. Crystal and photosensors CsI(Tl) + PD LunD Uppsala, TSL, GWC, B-line (Blue hall): Energy 179.31±0.80 MeV. excelent energy resolution for 180 MeV protons Huge contribution of nuclear interactions and multiple scattering

  16. Crystal and photosensors • Forward endcap • LaBr + PM  not yet investigated • Two layer detectors IEM, Chalmers Ë=f(D E1 )+ g(D E2) E D E1 D E2 LaBr3(Ce) of 30 mm LaCl3(Ce) of 150 mm the estimated final energy is proportional to the energy deposited in each layer need to be proven from measurements and simulations M.Turrion, O.Tengblad IEM

  17. Calorimeter models (GEANT4) Detailed simulations v1.2 v4.0a v4.0b Allowed very valuable information - geometry  efficiency and granularity - tracking algorithm tests etc etc…. H.Alvarez USC

  18. Barrel Prototypes CsI(Tl) + LAAPD Hamamatsu 2x S8664-1010

  19. Materials • Realistic frustum-shaped crystals: • Lanzhou • Hilger • St. Gobain (France and India) • Scionix • LAAPDs Hamamatsu • 2x(10x10) mm2

  20. Barrel Prototypes Square PMT Photonis (1 per 2 crystals) Rectangular Crystals

  21. Barrel Prototypes In 2008, construction of a prototype of 18 Xtals [CsI(Tl)] with 9 square PMT • Simulation and Tests of the prototype with different thickness of material in between the crystals depending on mechanical and physics considerations.

  22. Time schedule (R3B) Infofrom 2006  extension of ~ 1 years

  23. Conclusions • Good way towards the definition of the barrel design CsI(Tl) + PM /LAAPD First detectors (realistic size) will be mounted next weeks Prototypes ready around summer 2008 Different facilities are considered to perform in beam test with these prototypes • Detection in forward sector is still a real challenge We need to investigate in detail the proposed solutions and/or find alternatives Urgent to address this problem within next year • Technical man power is needed mechanical structure electronics and slow-control is not yet addressed • We are lacking the support of big laboratories Not yet urgent today but mandatory for the construction phase

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