Institut für Strahlenphysik Lothar Naumann Mitglied der Leibniz-Gemeinschaft CBM - Straw Tube Tracker Multisegmented Straws: Motivation Construction

Institut für Strahlenphysik Lothar Naumann www.fzd.de Mitglied der Leibniz-Gemeinschaft

CBM - Straw Tube Tracker

Multisegmented Straws:

MotivationConstructionTestHV-Front endSotware statusSummary&Outlook

Forschungszentrum Dresden-Rossendorf, Institut für Strahlenphysik Lothar Naumann www.fzd.de


MuCH STT RPC

•high spatial resolution•high rate capability•high radiation length•high efficiency•high robustness •low occupancy 0.01 hit/(cm2 event)

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CBM - Straw Tube Tracker Spacer

single straw

geometry 4 m; 4 mmrobustness highdetection efficiency 100%geom. acceptance 97%/mrate capability 4 MHz/cm2

spatial resolution 200 mradiation length 0.2 % X0

granularity > 10 cm2

occupancy > 10%



single straw

single straws



single straws

geom. acceptance (1-3/L[cm])100% 90% L=30cmgranularity 12 cm2

occupancy > 10%



single straw

segmented straw

end-plug spacer

single straws

New development for CBM (Patent):



single straw

segmented straw

end-plug spacer

spacer

x/X0 = 1 % x/X0 = 1 %

granularity 2 cm2

occupancy 2%



contact resistance ~ 1 Ω



length of the insensitive detector part: 2 * 5 mm

18 mm 5 mm 4.5 mm 0 mm

10 mm



length of the insensitive detector part: 2 * 5 mm


CBM - Straw Tube Tracker Flex-cable

HV supply +anode signal

one connector at the wire output





~1mm





~1mm

crosstalk ~ 1% /mcapacity 20 pF /mBV 3 kVx /X0 0.1%



signal 50/1 noise



signal attenuation measurement, simulation < 10% /m


CBM - Straw Tube Tracker Flex cable

signal attenuation measurement < 10% /m



geometry - a large area very thin sheet

Frontend Frontend



HF and controlled impedance design for theHADES MDC-1 anode signal connectors

MDC-1 crosstalk 1.5% capacity 15 pF impedance 122 Ω



multilayer PCB‘s (Stiff-Flexible-Cable) for theHADES MDC-1 anode signal connectors


HV connections to 32 channels

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

CBM - Straw Tube Tracker HV-board

1 ………………..32


Object realization

HV StripHV components

HVencapsulation

HV SMT components:

inexpensive;

high density and flex assembling;

But it need Hi technology in production

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.

HV robustness is the main problem!



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

(HV components incapsulation)

Out connector



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.



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


CBM - Straw Tube Tracker (stt) Software status

Implementation of one stt module


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

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!

CBM - Straw Tube Tracker Summary&Outlook

Institut für Strahlenphysik Lothar Naumann www.fzd.de Mitglied der Leibniz-Gemeinschaft

JINR, Dubna – V. Peshekhonov, V. Lucenko, V. Mialkowski,D. Peshekhonov, A. Savenkov, K. Viryasov, A. ZinchenkoLebedev PI, Moscow – V. TikhomirovPetersburg NPI, Gatchina – D. Seliverstov, E. Chernishova, L. Kudin, A. NadtochiUniv. of Technology, Warsaw – K. Zaremba, J. MarzecFZ Jülich – P. WintzFZ Dresden - Rossendorf, – L. Naumann

GSI-INTAS-8729


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Institut für Strahlenphysik Lothar Naumann Mitglied der Leibniz-Gemeinschaft CBM - Straw Tube Tracker Multisegmented Straws: Motivation Construction