1. Status of the forward tracker design
J. Smyrski
Institute of Physics UJ
Report from the forward tracker
meeting in Krakow, 16,17 Nov. 09
Tracking Meeting, GSI, 9 Dec. 2009

2. Space foreseen for tracking stations
DC1, DC2
DC3, DC4
DC5, DC6
(from the PANDA Magnet TDR)
width and height
of the experimental hall
x = ± 5000 [mm]
y= (-3500, 5000) [mm]
B. Lewandowski,
TB-meeting,
z(DC1) = (6050, 6250) [mm]
z(DC2) = (7450, 7650) [mm]
PANDA drawing v
gap in the dipole magnet
including the cut-out
for detector frames
x = ±1550 [mm]
y= ±(tg(5º)·z + 55) [mm]
z = (3930, 4770) [mm]
rectangular opening
in the muon filter
x = ±770 [mm]
y = ±520 [mm]
z = ?

3. Choice of wire inclination
Particles: 0.5 GeV/c muons
Dipole magnet setting: for 7.8 GeV/c beam
5 deg. inclination chosen

4. Configuration of double layers
+5
-5 0 0
-5
+5 →
Configuration better suited
for fast track reconstruction
with vertical straws

5. Active areas of the tracking stations
(Conservative choice)
Tracking
station
Number
of modules
w [mm]
h [mm] 1 2 3 4 5 6
4x8 =32
4x12 =48
4x25 =100
4x37 =148
1298
1944
4045
5984
640
690
767
1180
1480
Total number of modules: 408
Total number of straw tubes: 336 x 32 = 13056

6. Required simulations to determine needed active area of DC5 and DC6
Bl = 2 Tm, p(μ) = 1.5 GeV/c
DC6
DC5
DC4
DC3
DC2
DC1

7. Intensity distributions 0
Intensity distributions GeV/c pions emitted isotropically from the target)
1.5 GeV/c pions

8. nedeed number of layers in tracking stations (3, 4 double layers ?)
6 stations x 4 double layers = 24 double layers = 48 layers (overkill?)
-> check reconstruction efficiency, momentum resolution
assuming detection efficiency for single layer of 98%, 95%, 90%..

9. reduction of width of the forward TOF-wall compensated by increase of side walls
3200

10. Openings for the beam pipe
Tracking station beam pipe 
1, mm
3, mm
5, mm

11. Parameters of the openings

12. Mechanical design -
DC3, DC4 – Krakow
DC5, DC6 – Ferrara

13. Mechanical design – DC3, DC4
Frame with to double layers
2x 0º
±5º
2x 0º
±5º
(Opening for beam pipe
not designed yet)

14. Positioning of modules on support frame

15. Current design of straw module

17. Further topics
Suggestion to change acronym of the tracking stations from „DC” to „FT” (Forward Tracker)
Decision to continue development
of new end-plugs for straws

18. Backup slides

19. Inclination, coordinates and length of straw modules

20. Intensity distributions 0
Intensity distributions 0.3 GeV/c pions emitted isotropically from the target)

21. 0.75 GeV/c pions

22. 1.2 GeV/c pions

23. 1.5 GeV/c pions

24. 3.0 GeV/c pions

25. 7.5 GeV/c pions

26. 10.5 GeV/c pions