14 CBM Meeting V. Peshekhonov

1. R&D of the segmented straws Idea of straw segmentation was evolved from attempts to improve the straw TRT occupancy for the CBM Participants: CERN DESY Bonn University Geneva University Rossendorf, FZR P.N. Lebedev Institute JINR • R&D of the segmented straw and its elements • R&D of the readout • Multichannel prototype • Beam tests • Conclusions 14 CBM Meeting V. Peshekhonov

2. R&D of the segmented straw and its elements THE SPACER OUTER DIAMETER – 3,98 (+0;-0,02) мм LENGTH – 8 mm WEIGHT– 80 mg CAPILLARY TUBES: LENGTH – 4; 5 AND 6 mm INNER DIAMETER – 0.1 mm OUTER DIAMETER – 0.25 mm WEIGHT – 0.094 mg /mm Fragment of straw plane Diameter of the straw is 4 mm 14 CBM Meeting V. Peshekhonov

3. 150 50 50 200 200 250 250 150 100 100 1 2 3 4 5 6 7 8 9 10 R&D of the segmented straw and its elements Segmented straw with 10 segments. straw length – 1.6 m,; diameter – 4 mm; spacer length – 8 mm. Readout can be from both ends of the straws 14 CBM Meeting V. Peshekhonov

4. h4 Low-mass transmission lines (TL) Low-mass transmission lines are used for both - to transmit the high voltage on the segment anode wire from MB ( < 3kV ) - to transmit the signals from anode wire to FEE Al shield Kapton film bus h X Cross-section of the TL with 4 buses SIZE of TL (XhL): X = 8 x ~0.7 mm h ≤ 1.1 mm L ≤ 2 m Thickness ≈ 0.1%Х0 14 CBM Meeting V. Peshekhonov

5. Low-mass transmission lines (TL) experimentalresults. simulation 1 - amplitude for the readout without TL ( trough end-plug). Cu, 20 µm Cu, 20 µm W, 30 µm W, 30 µm W, 10 µm W, 10 µm A, a.u. L, cm L, cm Cross-talk : ~ 0,9 % for TL 1 m long ~ 3 % for TL 2 m long 14 CBM Meeting V. Peshekhonov

6. Multichannel prototype Double layer straw prototype consists of 96 straws (4 mm in diameter, 40 cm long) Anodes are under HV Straw contains 4-segmented anode like: 360 readout channels Readout - from segment’s contact wires only 60 transmission lines (8 buses/TL; 1 TL / 2 straws) TL size – 405 x 11 x 0.85 mm FEE located onto one side of prototype Density of analog electronics: 1channel per 1 mm 14 CBM Meeting V. Peshekhonov

7. Multichannel prototype. Stand tests Uniformity of the channels Bad channels - 6% < 0.36 сm3/h Gas Gain vs anode HV Gas leakage for first and second straw layers 14 CBM Meeting V. Peshekhonov

8. Beam tests Plane: 6 x 6 mm; 512 pads EUDET - Si-Tracker is intended for test-beam use and provides a simple interface between the beam-trigger, the DAQ and the device-under-test2. Very much thanks to Ingrid Gregor with colleagues Tracking resolution - 3 µm SST SiT 1 SiT 2 S S CERN, SPS H6, π, 400 GeV/c 14 CBM Meeting V. Peshekhonov

9. Beam tests Some fragments of the events display SS HPS Run 6118-6123. Track multiplicity for the EUDET 14 CBM Meeting V. Peshekhonov

10. Beam tests t – r dependences for the SS t – r dependences for the HPS 14 CBM Meeting V. Peshekhonov

11. Conclusions • It is possible to assembly multi segmented straws with diameter ≥ 4 mm • It is possible to produce the multi segmented straw chambers by mass-production • Signals from HV anode segments can be transmitted to the remote FEE • (up to 2 m) • Small value of the material budget is kept • Granularity of the chambers can be from 1 cm.sq. • Time-amplitude parameters and spatial resolution are kept • Improvement of the assembly technology is required 14 CBM Meeting V. Peshekhonov

12. Thanks for the attention 14 CBM Meeting V. Peshekhonov