1. CBM - Straw Tube Tracker
Multisegmented Straws:
Motivation
Construction
Test
HV-Front end
Sotware status
Summary&Outlook

2. CBM - Straw Tube Tracker
MuCH STT RPC
high spatial resolution
high rate capability
high radiation length
high efficiency
high robustness
low occupancy ?
0.01 hit/(cm2 event)

3. CBM - Straw Tube Tracker Spacer
single straw
geometry m;  4 mm
robustness high
detection efficiency 100%
geom. acceptance %/m
rate capability MHz/cm2
spatial resolution m
radiation length % X0
granularity > 10 cm2
occupancy > 10%

4. CBM - Straw Tube Tracker Spacer
single straw
single straws

5. CBM - Straw Tube Tracker Spacer
single straws
geom. acceptance (1-3/L[cm])100%
90%  L=30cm
granularity cm2
occupancy > 10%

6. CBM - Straw Tube Tracker Spacer
single straw
single straws
New development for CBM (Patent):
segmented straw
end-plug
spacer

7. CBM - Straw Tube Tracker Spacer
single straw
segmented straw
end-plug
spacer
x/X0 = 1 %
granularity 2 cm2
occupancy 2%

8. CBM - Straw Tube Tracker Spacer
contact resistance ~ 1 Ω

9. CBM - Straw Tube Tracker Spacer
length of the insensitive detector part: 2 * 5 mm
18 mm mm mm mm
10 mm

10. CBM - Straw Tube Tracker Spacer
length of the insensitive detector part: 2 * 5 mm

11. CBM - Straw Tube Tracker Flex-cable
HV supply +
anode signal
one connector at the wire output

12. CBM - Straw Tube Tracker Flex-cable
HV supply +
anode signal
one connector at the wire output
~1mm

13. CBM - Straw Tube Tracker Flex-cable
HV supply +
anode signal
one connector at the wire output
~1mm
crosstalk ~ 1% /m
capacity pF /m
BV kV
x /X %

14. CBM - Straw Tube Tracker Flex-cable
signal / noise

15. CBM - Straw Tube Tracker Flex-cable
signal attenuation measurement, simulation < 10% /m

16. CBM - Straw Tube Tracker Flex cable
signal attenuation measurement < 10% /m

17. CBM - Straw Tube Tracker Flex-cable
geometry - a large area very thin sheet
Frontend
Frontend

18. CBM - Straw Tube Tracker Flex-cable
HF and controlled impedance design for the HADES MDC-1 anode signal connectors
MDC-1 crosstalk %
capacity pF
impedance 122 Ω

19. CBM - Straw Tube Tracker Flex-cable
multilayer PCB‘s (Stiff-Flexible-Cable) for the HADES MDC-1 anode signal connectors

20. HV connections to 32 channels
CBM - Straw Tube Tracker HV-board
HV connections to 32 channels
1 ………………..32
design:
-the number of HV electrical circuits is equal to the number of segmented wires
-a unit consists of 32 HV circuits
-a unit is placed on the motherboard
-advantages: easy handling (replacement, repair etc.)
-problems: high density of components (one circuit per mm) providing of sufficient BV, robustness and minimization of the leakage current

21. CBM - Straw Tube Tracker HV-board
Object realization
HV robustness is the main problem!
HV components
HV Strip
HV SMT components:
inexpensive;
high density and flex assembling;
But it need Hi technology in production HV
encapsulation
We have to propose to use regular single units with flex connections for segments included.
Each unit will pass assembly, cleaning, drying and full HV test before installation on the mother board.

22. CBM - Straw Tube Tracker HV-board
Unit design
Multi-layer PCB ;
Opposite side is continuous GND plane;
Blind hole technology;
The unit (32x74x7 mm3) supplies 32 channels (8 tubes x 4 segments);
4 zone of incasulation
3 flex circuits go to wires;
Non soldered straw connection GND
(see Fig.3);
Output connector for Front-End electronic
Units will be installed on the mother board
1-st zone
(flex incapsulation & out)
2-nd zone
(HV components incapsulation)
3-d zone (flex incapsulation & out)
4-th zone
Out connector

23. The main prototype elements (area of HV circuits)
CBM - Straw Tube Tracker HV-board
The main prototype elements (area of HV circuits)
-All HV units are placed on the motherboard;
-Motherboard transfers signals and GNDs from the first segment to the HV units and is a shield for units;
-Motherboard is a common element for gas manifold and HV units box;
-Cover is a shield for units box too;
-Chain HV connections are provided by HV jumpers between units.

24. CBM - Straw Tube Tracker (stt) Software status
Geometry and MC point generation ready
Hit Maker ready
Reconstruction:
- global tracking with Kalman filter soon available
a standalone track finder under develop.
Contact person: Alexander Zinchenko

25. CBM - Straw Tube Tracker (stt) Software status
Implementation of one stt module

26. CBM - Straw Tube Tracker Summary&Outlook
R&D successful finished for: segmented anods segmented straws transmission lines R&D not finished for: high density readout with high potential (3 kV) R&D for HV and gas supply started Implementation of the Straw Tube Tracker in the CBM software started

27. CBM - Straw Tube Tracker Summary&Outlook
MC implementation: -input for specified hardware requirements Prototype test: -double-layer (2*48) multifold segmented straw detector is under construction and will be tested in June/July 08 The Straw Tube Tracker with segmented straws fulfill the CBM requirements!

28. CBM - Straw Tube Tracker
JINR, Dubna – V. Peshekhonov, V. Lucenko, V. Mialkowski,
D. Peshekhonov, A. Savenkov, K. Viryasov, A. Zinchenko
Lebedev PI, Moscow – V. Tikhomirov
Petersburg NPI, Gatchina – D. Seliverstov, E. Chernishova, L. Kudin, A. Nadtochi
Univ. of Technology, Warsaw – K. Zaremba, J. Marzec
FZ Jülich – P. Wintz
FZ Dresden - Rossendorf, – L. Naumann
GSI-INTAS-8729