RESEARCH and DEVELOPMENT for CBM (at LHE JINR)

1. RESEARCH and DEVELOPMENT for CBM (at LHE JINR) Yu.V. Zanevsky Laboratory of High Energies JINR, Dubna - NEW INFRASTRUCTURE - FAST GAS DETECTORS - DIPOLE SUPERCONDUCTING MAGNET JINR participation on the experimental program at GSI future facility 20-21 Nov., 2003

2. INFRASTRUCTURE in LHE JINR We have a present-day infrastructure for the R&D and construction of gas detectors: - winding machines - clean rooms - measurement devices - Front End Electronics - special tables e.t.c. Our previous infrastructure was successfully used for the HADES project. A new Detector Lab. wiil be employed firstly for the TRD / ALICE. http://lhedl.jinr.ru/ JINR participation on the experimental program at GSI future facility 20-21 Nov., 2003

3. NEW DETECTOR LABORATORY at LHE JINR Total area: ~ 400 sq. m Clean rooms: ~120 sq. m (class 10.000) Climate facility : (temperature and humidity control) JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003

4. NEW WINDING MACHINE, CLEAN ROOM Winding machine Under PC control ( ~20 ) Max. size: 2 m Clean room JINR participation on the experimental program at GSI future facility20-21 Nov., 2003

5. High Acceptance Di- Electron Spectrometer (HADES) JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003

6. Main parameters of HADES drift chambers (plane-2)__________________________________________________ • 6 trapezoidal low mass mini drift chambers (modules) were constructed at LHE JINR ( including R&D and Prototyping ) for Plane-2 of the HADES Spectrometer. Each module has an active area ~ 0,5 m2 and contains 6 drift chambers with different angle of winding. • Gas mixture – He + Isobutan, Cathode and Field wires performed from annealed Al wires. It reduces the radiation length x/Xo per chamber below 5 x 10-4 • Max. drift time ~ 80 ns • Efficiency ~ 99 % (with high multiplicity) • Position resolution (track fit for 2 chambers) ~ 39 mkm JINR participation on the experimental program at GSI future facility20 – 21 Nov., 2003

7. HADES PROJECT (JINR Participation) 6 multilayer low-mass Drift Chambers Plane-2 Front End Electronics (Ampl./Discr.) Hit finding software Track fitting software JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003

8. Fast Gas DetectorsYu. Zanevsky, S. Chernenko, V. Golovatjuk, L. Smykov, V. Zrjuev,(LHE JINR, Dubna) Scope of the Project: To develop: • large area (~ 2 x 2 m ² ) • high granularity • low mass • high speed ( ~ 10 5 / cm²s) Gas Detectors In this project participate also: GSI (Darmstadt), INFN (Frascati),NC PHEC (Minsk) University (Muenster) JINR participation on the experimental program at GSI future facility 20-21 Nov., 2003

9. Micromegas (MICROMEsh GAseous Structure) Conversion gap: 3mm Gas: Ne+10% C4H10 Amplification gap: 100 mkm (1 or 2 stage) JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003

10. Gas Electron Multiplier (GEM) ЛВЭ ЛВЭ Drift gap – 8 mm Transfer gap – 2 mm Induction gap – 2 mm F.Sauli, Nucl. Instr. Meth. A 461 (2001), 47-54 JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003

11. Electron microscope picture of a GEM foil Electron microscope view of a cross-section through one hole GEM Cu / KAPTON / Cu - 5/50/5 mkm Pitch – 140 mkm Hole – 70 mkm Center – 45 mkm C. Altunbas et al. Nucl .Instr. Meth. A 490 (2002), 177-203 JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003

12. GAS DETECTOR BASED on 2 GEM MESH JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003

13. Test of 2 cascade GEM at LHE JINR Ar - CH4 / 80 – 20 ΔVGEM1 = 350 V ΔVGEM2 = 350 V Fe-55 VD = 3560 V V1U = 2150 V V1D = 1800 V V2U = 1050 V V2D = 700 V 8mm 2mm 2mm JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003

14. Superconducting Dipole Magnet for CBM E.Matyushevsky, P.Akishin, Z.Borisovskaya, A.Shabunov (JINR) M.Turani (GSI) • BY integral: 1-2 Tm • Acceptance: 50° (vert.) and 60° (horiz.) • Gap: ~ 1m JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003

15. Superconducting Dipole Magnet for CBM Gap: ~ 1 m SP coils: 4 half Circles, dia. 1 m, (double pancake) Current: ~ 3000 A BY integral (Y=0) ~ 1,12 Tm Weight: ~76 tons General view JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003

16. Superconducting Dipole Magnet for CBM Color map of the basic dipole magnetic field component in the median plane JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003

17. Superconducting Dipole Magnet for CBM A proposed possible version of dipole magnet: - the same current and number of Amper x turns; - the same acceptance; - BY integral (y=0) 2,44 Tm. 9/Nov 2003 23:55:43 JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003

18. Superconducting Dipole Magnet for CBM Cut of the magnet 10/Nov 2003 00:08:49 JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003

19. CONCLUSIONS 1. The R&D work on the fast gas detectors is in progress at LHE JINR 2. Fast gas detector based on the GEM (2 cascade) is under the testing 3. The work on the simulation of Dipole Superconducting Magnet is in progress JINRparticipation on the experimental program at GSI future facility20 – 21 Nov., 2003