1. Dubna/JINR Status & Plans
PANDA Range System
Dubna/JINR Status & Plans
G.Alexeev
on behalf of Dubna group
Turin, June 16, 2009

2. Software activity: Hardware activity: * Muon Filter conceptual design
* Forward Range System conceptual design
* MDTs in PANDAroot for FRS
* MDTs in PANDAroot for MF -> pending a decision on concept
Hardware activity:
* Study of MDTs at test stand :
- “closed” vs “open” geometry (cosmic + Fe-55)
- strip signals amplification and r/o for “open” geometry
- coordinate accuracy with strip r/o, r.m.s. ~ 0,5 mm
* Design, production and tests of FE electronics - on stand and prototypes
* Full scale RS prototype ( 2m x 4m) -> second coordinate r/o with long strips :
- mechanics and MDTs are ready
- FE electronics is funded (BMBF) and being manufactured now
- beam test start is scheduled for autumn 2009 (within COMPASS/CERN)
* RS prototype ( 1m^3) :
- funds are requested (BMBF)
- to be conducted on PS beam lines at CERN
- for details see next presentation -> RS prototype beam test, the Proposal to PANDA

3. PANDA µ - Filter 700 MDTs Dipole Target Spectrometer 2600 MDTs
FRS
900 MDTs
Dipole
RICH
ECAL
Target Spectrometer
2600 MDTs
TOTAL : about MDTs
PANDA
Muon and Hadron Detection in PANDA by Range System

4. End Cap and Muon Filter

5. Side view

6. Top view

7. General view of Forward Range System (FRS) with beam pipe.

8. FRS module (G~=18.5 t)
Single FRS module in assembly process (park position of support platform; not shown)

9. (60mm/Fe + 30mm/MDT)x16
Superposition of FRS with inclined beam pipe: 4 modules(of 4 plates each) with lateral shift of 14.4 mm; beam pipe hole is 300mm x300 mm.

10. (60mm/Fe + 30mm/MDT)x16
(beam pipe perpendicular to FRS; inclined beam fits the pipe aperture with ~48mm gap. 48 48 48

11. MDTs in PANDAroot
Target Spectrometer
Endcap Barrel
FRS
beam

12. MDTs in PANDAroot for TS endcap (MDTs for MF = “clone” of TS_EC)

13. Test stand : different types of MDTs and FE electronics
MDT module
Ampl-8.3
QTC part

14. An artistic view of tested MDTs
G10 board, 4 strips, 1cm wide each
4 layers, 4 strips on each layer

15. Fe-55 spectra for MDT with closed and open cathode geometry
Fe-55 spectra vs anode voltage for 70% Ar + 30% CO2 gas mixture
Significant background for small detector cell 10X10 mm ( 5.9 keV X-ray attenuation length about 28 mm)
The same position of 5.9 keV peak at 100V anode voltage shift

16. Gas gain for counting rate plateau range
For gas gain calculation we used dependance of 5.9 keV peak position vs anode voltage

17. Comparison of MDTs with closed and open cathode geometry
Curves of cosmic counting rate for MDT with open cathode geometry have right shift about 80 volts and the same curves shape.
Plateau range is about 200 V

18. Wire and strip signals Signals after the AMPL-8.3 on 50 Ohm load
Single event
Averaged

19. Strip Signal Amplification Card (A2-16)
A2-16 card (two cascade Ampl-8.3 with 16 analog outputs).
Amplifiers
AMPL-8.3
Trace 1: Anode signal,
K≈60 mV/μA
Trace 2: Strip signal,
inverted, K≈480 mV/μA
To Amplitude
Analysis
from
MDT
Ampl 8.3
Ampl 8.3

20. Track reconstruction with 1cm x 8 cm strips
Tracks are near vertical and close to the center
σ ≈ 0.5 mm

21. A2DB-32 Board * double cascade amplification (0,1-10 uA input signals +/-, Ampl-8.3) * 32 channels analog output +/- (>=50 Ohm load ) * 32 channels logic output (ECL, LVDS – Disc-8.3)

22. Full scale RS prototype (2m x 4m) for 2nd coordinate strip R/O (manufactured, pending for r/o electronics)
45 short MDTs (360 wire r/o channels, maximum)
24 long MDTs (192 wire r/o channels, maximum)
4 m long strips, 1 cm width (192 strip r/o channels)
2 m long strips,1 cm width (360 strip r/o channels)

23. RS prototype for beam test
1530 mm
1000 mm
1060 mm
Fe volume ~ 1 m3 ( ~ 8 t ), 288 MDTs 1 m long
2000 channels of wire r/o channels of strip r/o

24. Plans for 2009
* MDTs layout in PANDAroot for whole Spectrometer (Dubna,
GSI, Torino) – MDTs for MF to be a dded
* Benchmark processes study in PANDAroot (Dubna, Torino)
* Study of prototypes:
- full scale (2m x 4m) RS prototype ( COMPASS, >)
- RS prototype (1 m3) beam test -> the Proposal to PANDA
( Dubna/JINR + ?
at PS/CERN , >)