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

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

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 10.000)

Climate facility :(temperature and humidity control)

NEW WINDING MACHINE, CLEAN ROOM

Winding machineUnder PC control ( ~20 )Max. size: 2 m

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

HADES PROJECT (JINR Participation)

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

Hit findingsoftware

Track fitting software

Front End Electronics (Ampl./Discr.)

6 multilayerlow-massDrift ChambersPlane-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 20-21 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% C4H10Amplification gap: 100 mkm (1 or 2 stage)

Drift gap – 8 mmTransfer gap – 2 mmInduction gap – 2 mm

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

Gas Electron Multiplier(GEM)

ЛВЭ 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 mkmPitch – 140 mkmHole – 70 mkmCenter – 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), 177-203

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

GAS DETECTOR BASED on 2 GEM MESH

VD = 3560 VV1U = 2150 VV1D = 1800 VV2U = 1050 VV2D = 700 V

Ar - CH4 / 80 – 20

ΔVGEM1 = 350 VΔVGEM2 = 350 V

Fe-55

8mm

2mm

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

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

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 possibleversion 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

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

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