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Zheng Li, 96th LHCC open session, 19th November 2008, CERN RD39 Status Report 2008 Zheng Li and Jaakko Härkönen Full author list available at

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Presentation on theme: "Zheng Li, 96th LHCC open session, 19th November 2008, CERN RD39 Status Report 2008 Zheng Li and Jaakko Härkönen Full author list available at"— Presentation transcript:

1 Zheng Li, 96th LHCC open session, 19th November 2008, CERN RD39 Status Report 2008 Zheng Li and Jaakko Härkönen Full author list available at http://rd39.web.cern.ch/RD39/

2 Zheng Li, 96th LHCC open session, 19th November 2008, CERN Outline 1. Trapping effect on Charge Collection Efficiency (CCE) in Super-LHC 2. Operation of current-injected-detectors (CID) 3. CCE measurements on CID 4. Beam test results of CID strip detectors 5. Summary

3 Zheng Li, 96th LHCC open session, 19th November 2008, CERN Trapping effect on CCE in S-LHC For fluence less than 10 15 n eq /cm 2, the trapping term CCE t is not significant Overall CCE is product of CCE t is trapping factor CCE GF is geometrical factor d t is trapping distance, and it is about 20  m at 10 16 n eq /cm 2 for non-CID detectors q MIP is unit charge/  m for MIP in Si = 80 e’s/  m

4 Zheng Li, 96th LHCC open session, 19th November 2008, CERN Current injected detector (principle of operation) J p = epμE divJ=0 divE=p tr E(x=0) = 0 (SCLC mode) The key advantage: The shape of E(x) is not affected by N mgl, and stable at any fluence E(x) x P+ +J p d

5 Zheng Li, 96th LHCC open session, 19th November 2008, CERN CID Reverse bias x 0 d E 2x10 15 n eq /cm 2 x 0 d E Charge Injected Detector (CID) –Operational Principle Evolution of E(x) with fluences 500 V n+n+ p+p+ n+n+ p+p+ w

6 Zheng Li, 96th LHCC open session, 19th November 2008, CERN CID Reverse bias x 0 d E 3x10 15 n eq /cm 2 x 0 d E Charge Injected Detector (CID) –Operational Principle Little change! n+n+ p+p+ n+n+ p+p+ Evolution of E(x) with fluences 500 V

7 Zheng Li, 96th LHCC open session, 19th November 2008, CERN CID Reverse bias x 0 d E 4x10 15 n eq /cm 2 x 0 d E Charge Injected Detector (CID) –Operational Principle Little change! n+n+ p+p+ n+n+ p+p+ Evolution of E(x) with fluences 500 V

8 Zheng Li, 96th LHCC open session, 19th November 2008, CERN CID Reverse bias x 0 d E 5x10 15 n eq /cm 2 x 0 d E Charge Injected Detector (CID) –Operational Principle Little change! n+n+ p+p+ n+n+ p+p+ Evolution of E(x) with fluences 500 V

9 Zheng Li, 96th LHCC open session, 19th November 2008, CERN CID Reverse bias x 0 d E 6x10 15 n eq /cm 2 x 0 d E Charge Injected Detector (CID) –Operational Principle Little change! n+n+ p+p+ n+n+ p+p+ Evolution of E(x) with fluences 500 V

10 Zheng Li, 96th LHCC open session, 19th November 2008, CERN CID Reverse bias x 0 d E 7x10 15 n eq /cm 2 x 0 d E Charge Injected Detector (CID) –Operational Principle Little change! n+n+ p+p+ n+n+ p+p+ Evolution of E(x) with fluences 500 V

11 Zheng Li, 96th LHCC open session, 19th November 2008, CERN CID Reverse bias x 0 d E 8x10 15 n eq /cm 2 x 0 d E Charge Injected Detector (CID) –Operational Principle Little change! n+n+ p+p+ n+n+ p+p+ Evolution of E(x) with fluences 500 V

12 Zheng Li, 96th LHCC open session, 19th November 2008, CERN CID Reverse bias x 0 d E 9x10 15 n eq /cm 2 x 0 d E Charge Injected Detector (CID) –Operational Principle Little change! n+n+ p+p+ n+n+ p+p+ Evolution of E(x) with fluences 500 V

13 Zheng Li, 96th LHCC open session, 19th November 2008, CERN CID Reverse bias x 0 d E 10x10 15 n eq /cm 2 x 0 d E Charge Injected Detector (CID) –Operational Principle Little change! n+n+ p+p+ n+n+ p+p+ Evolution of E(x) with fluences 500 V Electric field is extended through entire bulk regardless of irradiation fluence: virtue full depletion

14 Zheng Li, 96th LHCC open session, 19th November 2008, CERN The charge collection efficiency in CID and reverse biased strip detector

15 Zheng Li, 96th LHCC open session, 19th November 2008, CERN Charge Collection Efficiency of CID detector Total charge collected is the sum of both e’s and h’s integrated over the detector thickness (for MIP)

16 Zheng Li, 96th LHCC open session, 19th November 2008, CERN CCE vs V simulation –CID vs reverse bias 3X10 15 n eq /cm 2 Trapping of holes and electrons less in CID ? Larger  t used to fit CID data less trapping in CID

17 Zheng Li, 96th LHCC open session, 19th November 2008, CERN CCE of strip detectors as a function of fluence Pitch =80  m, width =20  m CID Reverse bias Larger  t used to fit CID data less trapping in CID

18 Zheng Li, 96th LHCC open session, 19th November 2008, CERN Characterization of CID detectors -Diodes CCE and TCT measurements with Cryogenic-TCT setup of RD39 –Temperature range 40-300K –Measurements on diodes: i.e. no WF seen. –CCE with 1060nm IR laser. –Comparison of irradiated CID vs. non-irrad reference device. –Comparison CID vs. normal reverse bias under exactly same conditions. He Striling cooler Vacuum chamber 3GHz oscilloscope Turbo pump SMU Heater controller Amplifier & T-bias Temperature controller Pressure controller

19 Zheng Li, 96th LHCC open session, 19th November 2008, CERN IR signals of 24 GeV/c irradiated pad detectors CID 500V / 220K

20 Zheng Li, 96th LHCC open session, 19th November 2008, CERN IR signals of heavily irradiated CID vs. reverse biased detectors 1.0 × 10 16 n eq /cm 2 3.0 × 10 15 n eq /cm 2 P-typeN-type

21 Zheng Li, 96th LHCC open session, 19th November 2008, CERN StripsPixels Expected CCE of CID at -50 ° C Simulation takes into account linear dependence of trapping probability on fluence β=0.01 cm -1  x E-field distribution is assumed 500 V

22 Zheng Li, 96th LHCC open session, 19th November 2008, CERN Characterization of CID strip detectors –Segmented detectors Test beam with 225 GeV/c muon beam at CERN H2. MCz-Si strip detector irradiated 3 × 10 15 n eq /cm 2. 768 channels attached to APV25 read-out CID detector placed in external cold box capable to cool down to -54 ° C while module is operational. Data acquisition with modified XDAQ. Analysis with CMSSW. μ - 230 GeV 8 reference planes. Resolution ~4  m. About 25000 events in 20min.

23 Zheng Li, 96th LHCC open session, 19th November 2008, CERN CID, irradiated up to 3×10 15 n eq /cm 2  MCz-Si AC-coupled strip detector with 768 channels  APV25 readout  Fabrication of detector and pitch adapter by HIP @ Helsinki University of Technology, Micronova  Irradiation with 26 MeV protons @ University of Karlsruhe  Bonding @ University of Karlsruhe 4 cm

24 Zheng Li, 96th LHCC open session, 19th November 2008, CERN P1 P2 P3 Q1 Q2 Q3 Peltier1 Peltier2 Peltier3 Cold plate H & T Monitoring Temp. Control Power Supplies H T Q4 Multi I/O Board PC Cooling the CID down to -50 0 C  In order to measure the CID in a test beam, the SiBT telescope was used as a reference telescope.  The CID was placed in front of SiBT inside an external cold finger, which was cooled down to -50 °C.  More about SiBT in Panja Luukka’s talks at RD50 Workshops and CMS Upgrade meetings.

25 Zheng Li, 96th LHCC open session, 19th November 2008, CERN CID strip detector test beam results –CCE at -52 0 C 75% 20% 3x10 15 n fluence (n eq /cm 2 ) 1x10 16 22.5% (5400 e’s) 6% (1440 e’s) 38 50

26 Zheng Li, 96th LHCC open session, 19th November 2008, CERN Noise of CID and non-irradiated detector CID noise at –40 °C Little change with T (-53 to –40 ° C) Reference detector noise at -20°C Fz-Si p + /n - /n +, same design, same processing, V fd ~10V 3.4 1.8 S/N=38/3.4>10

27 Zheng Li, 96th LHCC open session, 19th November 2008, CERN Tracking efficiency of CID vs reference CID at -53°CReference Fz-Si at -20°C Tracking efficiency in this content = probability that DUT measures the same track as 8 reference planes V fd 80%

28 Zheng Li, 96th LHCC open session, 19th November 2008, CERN Resolution of CID 3  10 15 n eq /cm 2 vs. non-irradiated reference CID 3  10 15 n eq /cm 2 -40°C Reference Fz-Si -20°C 15  m 20  m

29 Zheng Li, 96th LHCC open session, 19th November 2008, CERN Conclusions CID offers virtue full dpeltion and less trapping At least two times greater CCE is expected from CID than in reverse biased detectors according to C-TCT (IR laser) measurements and simulations. Normal detector operation possible by 300 μm MCz-Si up to 2×10 15 n eq /cm 2 fluence, i.e. strip layers in Super-LHC trackers. CID was measured at -40°C, -45°C and -53°C for 768 channels AC-coupled MCz-Si strip detector in test beam. Test beam results reveal >70%, and S/N >10 after 3  10 15 n eq /cm 2 irradiation. Test beam was performed with recycled CMS electronics and DAQ. CID operation possible up to 1×10 16 n eq /cm 2 fluence. Collected charge equals ≈7000e - and 30%.

30 Zheng Li, 96th LHCC open session, 19th November 2008, CERN Work plan 2009 Goal: Be closer to the LHC experiments Test beam on heavily irradiated CID strip detectors available now in summer 2009. New micro strip sensor processing (ATLAS and CMS specifications). –Development (different thickness) –Irradiation 1.0-10  10 15 n eq /cm 2. –Module assembly and bonding. –Test beam in 2010 Study of CID suitability for higher temperature operation. - Target is -25°C i.e. operational temperature of current LHC trackers. - Detector thickness study: the thicker, the higher operational T - Temperature dependent simulations of CCE and S/N. - Measurements on diodes with C-TCT. - Trapping time constant measurement of CID - Test beam results analysis. - Optima detector configurations (n on p, symmetrical, p on p, n on n)

31 Zheng Li, 96th LHCC open session, 19th November 2008, CERN RD39 Conference participation in 2008 10th International Workshop on Radiation Imaging Detectors in Helsinki, Finland, June 29 - July 3, 2008. 6th IFAMST The International Forum on Advanced Material Science and Technology, Hong Kong, June 12-14, 2008. 7th International Conference on Radiation Effects on Semiconductor Materials Detectors and Devices, Florence,15-17 October 2008. Pixel2008, FNAL, Batavia, IL, USA, 23–26 September, 2008 CMS Upgrade workshop, FNAL, Batavia, IL, USA, November 18- 20, 2008. RD39 Workshops at Ljubljana, Slovenia and at CERN (June and November, 2008)

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