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 Nov., 2003

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. JINR participation on the experimental program at GSI future facility Nov., 2003

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

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

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

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 m 2 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 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 facility 20 – 21 Nov., 2003

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

Fast Gas Detectors Yu. 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) JINR participation on the experimental program at GSI future facility Nov., 2003 University (Muenster)

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

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

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 JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003 C. Altunbas et al. Nucl.Instr. Meth. A 490 (2002),

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

V D = 3560 V V 1U = 2150 V V 1D = 1800 V V 2U = 1050 V V 2D = 700 V Ar - CH 4 / 80 – 20 ΔV GEM1 = 350 V ΔV GEM2 = 350 V Fe-55 8mm 2mm JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003 Test of 2 cascade GEM at LHE JINR

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

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

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 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 :55:43 JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003 Superconducting Dipole Magnet for CBM

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

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 JINR participation on the experimental program at GSI future facility 20 – 21 Nov., 2003