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Edgeless Silicon detectors for the TOTEM experiment

8 th ICATPP Conference on Astroparticle, Particle, Space Physics, Detectors and Medical Physics Applications (Villa Erba, Como 6-10 October 2003). Edgeless Silicon detectors for the TOTEM experiment. Gennaro Ruggiero CERN EP on behalf of the TOTEM Collaboration. The TOTEM Collaboration.

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Edgeless Silicon detectors for the TOTEM experiment

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  1. 8th ICATPP Conference on Astroparticle, Particle, Space Physics, Detectors and Medical Physics Applications (Villa Erba, Como 6-10 October 2003) Edgeless Silicon detectors for the TOTEM experiment Gennaro Ruggiero CERNEP on behalf of the TOTEM Collaboration

  2. The TOTEM Collaboration Gennaro Ruggiero, TOTEM Coll.

  3. OUTLINE • Why edgeless detectors? • Status 2002 • Cold edgeless silicon detectors • What has been done (2003) • Warm edgeless Planar Detectors • Active edge 3D and Planar-3D detectors Gennaro Ruggiero, TOTEM Coll.

  4. ~150m ~220m Optical Theorem The TOTEM experiment at LHC http://totem.web.cern.ch/Totem/ -6.5<h<6.5 Gennaro Ruggiero, TOTEM Coll.

  5. Why edgeless detectors? Position of the sensitive edge of the detectors (10 +.5mm) b* = 1540 m Roman Pot Gennaro Ruggiero, TOTEM Coll.

  6. Detector requirements • High and stable efficiency near the edge (< 10 mm) facing the beam • Try to do better than present technology guard rings ~0.5 mm • Detector size is ~3x 4 cm2 • Spatial resolution ~20 micron • Radiation tolerance >1014 n /cm2 equiv. Gennaro Ruggiero, TOTEM Coll.

  7. Cold Silicon • RD39/NA60 have investigated/used silicon at cryogenic temperatures (~ 100-130 K) • Studies hint at possibility of operating silicon microstrip without guard rings at LN temp. K.Borer et al.,NIM A 440 (2000) 5. L.Casagrande et al.,NIM A (2002) 325-329. • In 2002 we have performed a first measurement on cold edgeless silicon detector Z. Li et al, "Electrical and TCT characterization of edgeless Si detector diced with different methods", IEEE NSS Proc., San Diego, Nov. 2001 Gennaro Ruggiero, TOTEM Coll.

  8. Measured edge=physical edge (0+20microns) Hits in the cut detector Hits in the telescope (all good tracks) Reconstruction of the cut edge Tracking Efficiency V. Avati et al., First test of cold edgeless silicon microstrip detectors, Conf. Proc. Of 9th Pisa Meeting On Advanced Detectors - Frontier Detectors For Frontier Physics May 2003, La Biodola, Isola d'Elba, Italy. NIMA to be publish. Gennaro Ruggiero, TOTEM Coll.

  9. cut edge p+ Io Is Ib n+ Rising the temperature… >200K ITot=Io+Is+Ib~Is • Width of n+ ring <20m • n+ ring at 30m from p+ • n+ ring and n+ backplane at the same potential Objective: • reach the full sensitivity to the physical edge of the sensor >200K Inconvenience: • low temperature required • At the edge, too high electric field at the strip surface and too low at the backplane Gennaro Ruggiero, TOTEM Coll.

  10. B B A A “Warm” Approach (in collaboration with IOFFE PTI St. Petersburg/RIMST Moscow) Objective: • Temperature operation >-20°C (simplified cooling system) • Ease the thermal coupling to the foreseen readout electronic (Hybrid of the CMS Tracker ) • Reduction of the guardring structure <50m 2 guardrings 1 guardring at the sensitive edge p+ p+ n+ n+ edge edge Gennaro Ruggiero, TOTEM Coll.

  11. Guardring Designs 40m Inner ring Outer ring Dicing of the samples: diamond saw cutting 25m At -5 °C for 100V (Vfd~40V): Bulk current (A)~ 25nA Surface current (B) ~ 40A Leakage current independent of the configuration >> Gennaro Ruggiero, TOTEM Coll.

  12. Test Beam Sept. 2003 • Self referencing modules aligned along the beam axis • Card initially designed to insure a gradient of temperature up to 100 K between electronic and detectors) • Several guardring configurations tested on AC coupled microstrip detectors CMS TOB hybrid sensitive edges Front view (reference detector) Back view (edgeless detectors) kapton laminating 600m G10 plate Gennaro Ruggiero, TOTEM Coll.

  13. Rb Br Bl Al Ar Ra Fist Results • Two modules placed back to back • Ra and Rb reference detectors with 50m Coincidence of the two vertical (reference) planes with condition of signal on Al or signal on Ar Gennaro Ruggiero, TOTEM Coll.

  14. Sensitive Edges Rb Br Bl • Al=Ar with 2 guardrings and strips 40m away from the sensitive edge • Bl=Brwith 2 guardrings and strips 50m away from the sensitive edge Bl Br Al Ar Ra Al Ar Gennaro Ruggiero, TOTEM Coll.

  15. Signal • Signal between 16 and 18 ADC counts (1 count~1) for edgeless detectors Gennaro Ruggiero, TOTEM Coll.

  16. 3D Detectors and Active Edges • EDGE SENSITIVITY <10 mm • COLLECTION PATHS ~50 mm • SPATIAL RESOLUTION 10-15 mm • DEPLETION VOLTAGES < 10 V • DEPLETION VOLTAGES ~105 Vat 1015n/cm2 • SPEED AT RT 3.5 ns • AREA COVERAGE 3X3 cm2 • SIGNAL AMPLITUDE 24 000 ebefore Irradiation • SIGNAL AMPLITUDE 15 000 e-at 1015n/cm2 • p+ ELECTRODES SHORTED BY 16 Al STRIPS • PITCH = 200mm • TOTAL WIDTH = 3.195 mm • THICKNESS ~180 mm C. Da Via', J. Hasi, A. Kok, (Brunel), G. Anelli, M. Deile, J. Lozano, J. Kaplon, (CERN), J. Morse (ESRF), V. Bassetti (Genova), S. Parker (Hawaii), F. Oljemark (Helsinki), C. Kenney, (MBC) • NIMA 395 (1997) 328 • IEEE Trans Nucl Scie 46 4 (1999) 1224 • IEEE Trans Nucl Scie 48 2 (2001) 189 • IEEE Trans Nucl Scie 48 6 (2001) 2405 • IEEE Trans Nucl Scie 48 5 (2001) 1629 • CERN Courier, Vol 43, Number 1, Jan 2003 Gennaro Ruggiero, TOTEM Coll.

  17. Test beam 2003- preliminary TRACK HITS IN THE 5 x 5 cm2 TELESCOPE Y DIRECTION CORRELATED TRACK HITS IN THE 3D PLANE 3 Y DIRECTION scta 3D counts counts mm mm mm NORMALISED TRACK HITS IN THE Y DIRECTION ratio DISTRIBUTION WIDTH = 3.2 mm mm PHYSICAL WIDTH = 3.195 mm 3D planes Gennaro Ruggiero, TOTEM Coll.

  18. E-field p + + Al p + Al E-field i n ++ Al n ++ Al n + Al Microcracks, chips etc.. Planar detectors with 3D Edges PLANAR-3D = PLANAR DETECTOR + DOPANT DIFFUSED IN FROM DEEP ETCHED EDGE THEN FILLED WITH POLYSILICON PLANAR GUARD RING Sinks surface leakage current MEDICI Simulation of the equipotential lines for a 70 V bias 300 mm device (J. Segal MBC) Depletion boundary Gennaro Ruggiero, TOTEM Coll.

  19. ALS X-ray microbeam signal on the 1ST and 2ND channels of a planar detector with 3D active edges Inter-channel distributions tails from charge sharing and Au x-rays Leakage current at 200V = 6nA 150 mm MEASURED DEAD EDGE ~ 5 mm Gennaro Ruggiero, TOTEM Coll.

  20. Outlook for 2004 Planar detectors with reduced guardrings: • Promising results at 300 K for different guardring structures (<50um) • Optimisation of the guardring structure • Radiation Hardness to be checked • Reproducibility of results for ~3x4 cm2 detectors • Design of a prototype detector for Roman Pots 3D and planar detector with 3D edges: • Further production of prototypes • Design and Test of a 3x4 cm2 detector Foreseen Production in 2005 Gennaro Ruggiero, TOTEM Coll.

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