1. 1 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Preparation of the TDR for the forward tracker University Ferrara + Jagiellonian University, Cracow Main sections: 1.Requirements and performance goals 2.Tracking system design 3.Expected performance 4.Construction of tracking stations 5.The gas system 6.Readout electronics 7.Power system 8.Integration 9.Calibration 10.Monitoring 11.Tests of prototypes 12.Organization Results needed Writing can to start

2. 2 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

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9. 9 News from Cracow Prototype straw module Wire tension measurement Tracking simulations Calibration of straws in non-uniform magnetic field

10. 10 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Module: 2x 16 straws straws printing boards for positioning and grounding straws printing board for RC elements gas in out

11. 11 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Assembling modules in a detection plane rotation center support frame double layer : vertical wires (0  ) and (0  ) or inclined wires (+10  ) and (-10  )

12. 12 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 One tracking station with four double-layers Two double layers with vertical wires Two double layers with inclined wires e.g. (+10  ) and (-10  ) Two double layers with vertical wires

13. 13 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Gluing the straws together 1 layer 2 layers droplets of glue pressure 2 bars

14. 14 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Transferring the module Transfer frame

15. 15 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Mounting on the support frame after removing the transfer frame Module on the support frame

16. 16 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 plans test the procedure of transferring and installing the modules on the support frame measure the positions and deformations of straw (photo-modeler) measurement of high voltage characteristics, determination of the noise level test of reliability of the electrical contacts to straws

17. 17 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Device for measuring wire tension Principle of measurement: generation of voltage pulse (30 V, 1 ms) through wire placed in magnetic field measurement of frequency of dumped oscillations by observation of waveform of induced current

18. 18 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Measurement of wire tension Minimum field to measure signal frequency: ~0.5 T cm

19. 19 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Measurement of wire tension  20 μm Tungsten wire L = 1.10 m  =

20. 20 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Simulations of the forward tracking PandaRoot framework Kalman filter Detection efficiency (~98%) and position resolution (~60μm) based on the results of tests of the Juelich straws Momentum determination using 3 pairs of the forward tracking stations; each station contains 4 double layers of straws Work of Ola Wronska Bl = 2 Tm, p(μ) = 1.5 GeV/c DC6 DC5 DC4 DC3 DC2 DC1

21. 21 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Momentum resolution

22. 22 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Main objectives Main factor(s) limiting the momentum resolution, Influence of the forward RICH on the tracking, Required inclination of wires, Required position resolution, Required extension of active areas in the x direction.

23. 23 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Variation of x-t relation in non-uniform magnetic filed of the dipole magnet (calculations with the GARFIELD) Gas mixture: 90% Ar + 10% CO 2 Gas pressure: 2 bar Sense wire voltage: +1600 V track z x straw variation of Bx variation of By

24. 24 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Stray field in the tracking stations before and after the dipole magnet Components Bx, By, Bz of stray magnetic field within the active volumes of the tracking stations DC1, DC2, DC5, DC6 are smaller than 0.35 T Variation of x-t relation along one straw and from straw to straw in one detection plane is smaller than 0.05 mm DC 1 2 3 4 5

25. 25 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Non-uniform magnetic field inside the dipole magnet gap Resulting corrections (of up to ~0.35 mm) to x-t relation can be in principle calculated using GARFIELD and applied as function of x- and z-coordinate for each straw layer