1. m -> eg Drift Chambers
Test Chambers Tokyo and mini-Prototype
Further Development and Tests
Double Cathode Test Chamber
Charge Division Test Chamber
Chamber Construction
(Alignment and Calibration)
(Software Development)
Schedule and Man power
Je 15/07/2002

2. Je 15/07/2002

3. Second stage of amplification
New Preamplifier
parallel resistor to easily adapt input impedance
Geometrical requirements to be mounted directly on the frame
Second stage of amplification
Same chip
Outside COBRA
Anode and cathode prints
Je 15/07/2002

4. Layout showing 2 of the 3 channels of the new preamplifier
Je 15/07/2002

5. Schematic view of anodes and cathodes
Add half a dummy cell
double central cathode
Je 15/07/2002

6. Cathode shape and resolution
Triple-strip vernier 
2 double-strip cathode
Momentum resolution
.9 % FWHM
Efficiency
98 % -> %
Better homogenous position resolution
Cross Talk between 2 central cathode
Gas, magnetic field
„auto calibration“
Test THREE BONDS 1350
Je 15/07/2002

7. Test Prototype 2
Je 15/07/2002

8. Auto calibration with cosmic and particles in magnetic field, cross talk, gas optimization in magnetic field
Je 15/07/2002

9. Charge Division Test Chamber
W(330 W/m) or Steel(1200 W/m)
Anode print and readout
Test THREE BONDS 1350
Je 15/07/2002

10. Cathode hood
Je 15/07/2002

11. Cathode foil Tension : Dl /l = 1.0 % , Dw /w = 0.5 %
Je 15/07/2002

12. Gas tightness
Je 15/07/2002

13. Je 15/07/2002

14. Je 15/07/2002

15. Je 15/07/2002

16. Chamber support
Complete chambers system with cables and supplies as one block in and out
Chamber always returns at the same position in the support
Je 15/07/2002

17. Alignement and calibration
Chambers block measured outside COBRA
cosmic muons or beam particles (each anode and cathode relativ to the others)
position cathode reference point to the support reference: „Vermessungsgruppe“
Position target
Edge of Michel spectrum
Calibration run with small targets
Al , S
Different z positions ,vary cos(q)
Je 15/07/2002

18. Software development No calculations done in „DC group“
Wait for Results from R%D
Charge clusters in pulse shape and pileup
Experimental tails
Behaviour in magnetic field
Cross talk
Manpower
Je 15/07/2002

19. Je 15/07/2002

20. schedule prints Cath. Amp. frame tests t P 1:1 c DC j a s o n d f m
Cath.
Amp.
frame
tests t
P 1:1 c DC
Schwdule drfgdgfdgdfgs
Je 15/07/2002

21. Je 15/07/2002

22. Je 15/07/2002

23. Je 15/07/2002

24. Je 15/07/2002

25. Je 15/07/2002