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The TC: status. Flavio Gatti UNIVERSITY and INFN of Genoa, Italy

The TC: status. Flavio Gatti UNIVERSITY and INFN of Genoa, Italy. TC design review vs. DC and N2-Bag. Nitrogen Bag Not shown. Scintillating Fibers. Preamplifiers and cables. From COBRA center. 105 cm. 25 cm. 8.5 º. 19 º. 22 º. 11 º. B. B. Timing Counter: final desing review.

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The TC: status. Flavio Gatti UNIVERSITY and INFN of Genoa, Italy

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  1. The TC:status.Flavio GattiUNIVERSITY and INFNof Genoa, Italy

  2. TC design review vs. DC and N2-Bag Nitrogen Bag Not shown Scintillating Fibers Preamplifiers and cables

  3. From COBRA center 105 cm 25 cm 8.5º 19º 22º 11º B B Timing Counter: final desing review Scintillator Slab ☺ 20°rotation increase response uniformity and timing performance achievable by using the coincidences ☺ Positron Path-Length (5 cm)enough for the required Timing Res. ☺ Maximal Matching Scintillator-PM -> Note: cut of upper edge(5mm in radial direction in order to avoid TC-D.C. contact -> lower edge is also cut away in order to have symmetrical shape ☺ Optimal compromise between PM field gain suppression factor availabe space. PM tilted of ~20º respect to the Mag.Field, ~10º respect to the axis 5mm Scintillator Cross Section 5mm PM active diameter: 39 mm Sectional view PM outer Diameter :52 mm 0.75 T 1.05 T Long. view

  4. Re-shaped Scintillating Slab Curved Scintillating Fiber Scintillating Slab Hollow adapter and Slab black cover

  5. Comparison of MEG TC with other timing detectors • MEG TC 4x4x90 BC404 R5924 270 38 Table form E.Nappi / Bari

  6. TC Final Design • A PLASTIC SUPPORT STRUCTURE ARRANGES THE SCINTILLATOR BARS AS REQUESTED • THE BARS ARE GLUED ONTO THE SUPPORT • INTERFACE ELEMENTS ARE GLUED ONTO THE BARS AND SUPPORT THE FIBRES • FIBRES ARE GLUED AS WELL • TEMPORARY ALUMINIUM BEAMS ARE USED TO HANDLE THE DETECTOR DURING INSTALLATION • PTFE SLIDERS WILL ENSURE A SMOOTH MOTION ALONG THE RAILS

  7. • PMTs ARE ATTACHED, BY MEANS OF THE INTERFACE SOCKET, TO THESCINTILLATOR BARS • GIVEN THE MASS, AN ELASTIC AND REMOVABLE SILICONE GLUE IS APPROPRIATE • THE HOLLOW INTERFACE ELEMENT IS A “CUSTOMDESIGNED” PROFILE THAT ADDS A MINIMUM AMOUNT OF MATERIAL BETWEEN THE FIBRES AND THE BARS • SLOT FOR CABLES and OPTICAL FIBERS HAVE BEEN FORESEEN TO ALLOW THE CABLES FROM THE INNER PMT TO EXIT

  8. Under construction:PMT socket (beloW), hollow\interface and plastics bars

  9. Copper block APD Splitters Pulsed Laser Peltier Cell 1/1000 attenuator Integrating Calibrated Photometer Fast Photodiode Photomultiplier Curved TC (trigger & pattern):APD test system A batch of not irradiated about 1100 APDs has been received in April. These are under test for selection and binning (grouping APDs with same V-breakdown). The test set-up allow automatic data acquisition by using pulsed laser response.

  10. Curved detector: APD test system

  11. APD0210117506_20ID_M APD0107115426_20ID_M APD8411087442_20ID_M APD8418088162_20ID_M dark vs H.V. Temperature 20°C APD8223084713_20ID_M I APD8201082393_20ID_M APD1910145247_20ID_M APD8024081013_20ID_M 1.00E+01 APD8007079173_20ID_M APD791478311_20ID_M APD1908145087_20ID_M APD1905144927_20ID_M APD1906145007_20ID_M APD1909145167_20ID_M APD1913145407_20ID_M APD1902144767_20ID_M APD1903144847_20ID_M APD1911145327_20ID_M APD8206082873_20ID_M 1.00E+00 APD1222134415_20ID_M APD1212133615_20ID_M APD1211133535_20ID_M APD1213133695_20ID_M APD1218134175_20ID_M APD8710092535_20ID_M APD8810094569_20ID_M APD8822095449_20ID_M APD8709092455_20ID_M I Dark @ 10Mohm (Volts) APD8722093575_20ID_M APD8711092615_20ID_M 1.00E-01 APD8811094649_20ID_M APD8619091391_20ID_M APD8601089791_20ID_M APD1512138823_20ID_M APD1511138743_20ID_M APD1822144554_20ID_M APD1812143994_20ID_M APD1704141813_20ID_M APD1720142933_20ID_M APD1613140756_20ID_M APD1611140596_20ID_M 1.00E-02 APD1612140676_20ID_M APD1616140996_20ID_M APDJA0296_20ID_M APDJA0302_20ID_M APDJA0288_20ID_M APDJA0307_20ID_M APDJA0312_20ID_M APDJA0308_20ID_M APDJA0309_20ID_M APDJA0311_20ID_M APDJA0295_20ID_M 1.00E-03 APDJA0289_20ID_M APDJa0290_20ID_M 2.50E+02 3.00E+02 3.50E+02 4.00E+02 4.50E+02 5.00E+02 APDJA0292_20ID_M APDJA0294_20ID_M APDJA0316_20ID_M H.V. (Volts) APDJA0304_20ID_M APDJA0305_20ID_M APD comparison: PSI(blue), new Hamamatsu (red) I = 50 nA

  12. Kapton Flex. APD Black Coating Electronics boards -10 channels Scint. Fibers Transition board Copper Cold Finger(~20°) Peltier Cell Heat Exchanger APD set-up: conceptual design APD even and odd interleaved, FRONT VIEW: To be connected to the fibers SIDE VIEW with fiber, electronics, cooler

  13. APD read-out: final design

  14. 5x5 mm scint. Fiber APD readout MC of the curved TC • L.Y.=8000 ph/Mev • Trap eff.= 7% • APD gain = 500 min. • Q ~ 1.5x10^5 • Detect. eff. ~ 98%

  15. APD Preamplifier • ENC: 1500 e rms; Risetime:5 ns; Pulse-length: 50 ns

  16. Banch test of the APDs Preamplifier Test pulser Output 1V/ pC 5.5 ns risetime

  17. From TC right side From TC left side 152 152 A*B A B 152 Mask A Mask B Clock, control signal, etc. Control Logic Encoder To Trigger and monitor To VME bus Register Encoding the hit pattern

  18. To be defined soon: • Definition of the supporting structure and construction (july) • Insert APD read-out system in the final design (july) • APD amplifier PCB and production (end of sept.) • Validation test at BTF (LNF) of 10 elements of curved detectors(sept.) (we are undertaking a preliminary test with cosmics) • Final construction of whole TC (sept-nov). • Estimate delivery of the timing counter end of november • Test @ BTF: december Under study (advanced status) • TC bag • TC curved detector: digital pattern generator • TC linear detector: DRS matching electronics

  19. Provisional design of N2 bag

  20. N2 bag inside cobra

  21. Access port on cobra flanges

  22. He Diff. in Plastics Film( cm^3 m^2 )/( atm mm day)

  23. He input in the TC bag for EVAL F : few x 10-5 mbar/day

  24. Attenuator (passive) Inverter + offset 0.15 - 1.7 V To the DRS Passive Splitter To the DRS Fast double Thres. Discr. Shaper + offset 0.15 – 1.7 V 20 MHz reference PM1 PM2 T1 Disc 1 T2 Disc 2 How to match the Read-out with DRS?

  25. Summary • Scint Slab (BC404) resolution=91 ps • Timing resolution over the whole length = ±5% Max. • Plastics sizes, shapes and PM coupling works fine. • The solution has been indirectly validate in the COBRA • A test with the matching electronics with DRS in order to verify the readout solutions is foreseen in sept/oct. • Final design has been done and reviewed and the main parts of the TC are under construction ( BC404 slab, plastic black coverage, socket for PM, interface) • TC bag: a prototype design is under study, plastics we have considered EVOH, SARAN (FEP, Nylon 6, TEP Polyamide) • New batch of not irradiate APD have been delivered April. The test is positive ( 90% acceptance) • Electronics for APD. (1) Two solutions: high bandwidth OPA (lower cost-higher noise), integrated charge amplifier( higher cost, lower noise). -->Selected a mixed solution. (2) PCB that groups 8/10 APD (3) encoding with FPGA-VME.

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