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T992 SLHC Rad -Hard Sensor Tests at FTBF

T992 SLHC Rad -Hard Sensor Tests at FTBF. Lorenzo Uplegger Fermilab. All-Experimenters’ Meeting April 25, 2011. Particle f luence at SLHC. L = 2500 fb -1. STRIPS. PIXELS. At R=5cm the radiation fluence will be around 10 16 n- eq /cm 2 !!. Radiation Hardness of Sensors.

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T992 SLHC Rad -Hard Sensor Tests at FTBF

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  1. T992 SLHC Rad-Hard Sensor Tests at FTBF Lorenzo Uplegger Fermilab All-Experimenters’ Meeting April 25, 2011

  2. Particle fluence at SLHC L = 2500 fb-1 STRIPS PIXELS At R=5cm the radiation fluence will be around 1016 n-eq/cm2!!

  3. Radiation Hardness of Sensors

  4. T992 Goals • Our goal is to test the candidates for the SLHC upgrade before and after irradiation • to compare the performances and understand if we have a technology capable of withstanding • the enormous fluences. We are mainly focusing our efforts on three different sensor types: • Diamond sensors • 3D sensors • MCZ Planar silicon sensors • Big global effort on Sensor R&D for the SLHC • RD42 (diamond) • 3D consortium (3D sensors) • ATLAS, CMS and LHCb • We are testing all the different sensors using the same Read Out Chip (ROC) in order to have • a fair comparison between all candidates • T992 is open to all, independent of their experimental affiliation or interest in any • particular technology

  5. 3D Sensors • First proposed by Sherwood Parker in the mid-90s: • “3D” electrodes -> narrow columns along the detector thickness • diameter: 10 μm, distance: 50-100 μm • Lateral depletion: great for rad-hard • Lower depletion voltage • Fast signal • 3D detectors also allow the implementation • of the “Active Edge” concept • Interest in the Forward physics community • Active Edge concept can lead to improved • layout geometries

  6. CMS 3D Sensors • CMS pixel size is 100 μm x 150 μm • Different designs: • 1 column pixel • 2 columns pixel • 4 columns pixel 3D sensor produced at SINTEF

  7. Diamond sensor • Diamond sensor bump-bonded to a CMS pixel ROC

  8. Collaboration • Many different institutions and collaborators for the CMS pixel upgrade • Fermilab • S. Kwan, A. Prosser, L. Uplegger, R. Rivera, J. Andresen, J. Chramowicz, P. Tan, C. Lei • Purdue • E. Alagoz, O. Koybasi, G. Bolla, D. Bortoletto • Colorado • M. Dinardo, S. Wagner, J. Cumalat • Texas A&M • I. Osipenkov • Milano • L. Moroni, D. Menasce, S. Terzo • Torino • M. Obertino, A. Solano • Tata Institute • S. Bose • Buffalo • Kumar, R. Brosius • IHPC Strasbourg • J. M. Brom • Non-CMS T992 participants: • Syracuse • J. Wang, M. Artuso

  9. Setup • The setup is the CAPTAN based pixel DAQ which is part of the MTEST facility. • We have an entire pixel telescope with 8 silicon planes, 4 upstream and 4 downstream, • and we place the Detectors Under Test (DUTs) in the middle. TELESCOPE BOX CAPTAN STACK POWER SUPPLY DUT SENSOR BIAS SCINTILATOR ROUTER

  10. Runs • We already took data in two previous test-beam campaigns (September and November 2010) • with some 3D and diamond detectors. • This time the goal was to test new 3D and diamonds and also study some of the detectors • that were already tested in November and then irradiated. • unfortunately we were not able to make any of the 3D irradiated sensor work and • we are still trying to understand what happened. • We then proceeded to test 9 new 3D sensors and only 1 diamond detector. • Again for all detectors we did: • Angle scans • Bias scans • Threshold scans With so many detectors and so many scans we had to do we took advantage of the double spill structure that the Accelerator Division provided us. We really thank the management which made this possible in such a short time!

  11. Online quick check Our software allows us to verify online that we don’t have particular problems…

  12. Preliminary results • The analysis is ongoing and we only have few results. • We have regular biweekly meetings where we are discussing issues and possible • improvements in the offline software which is still under construction. Diamond detector residuals prob(c2,ndof) > 0.01 (exclude DUT) ~ 4.6% nrow2 • ~ 33 mm Prob(2, ndof) Xtrk – Xhit (mm) Ytrk – Yhit (mm) the residuals are well in agreement with the single hit resolution expected when the DUT is facing the beam and most of the hits fire just one pixel

  13. Conclusions and plans • As mentioned earlier the main goal of testing irradiated devices was not achieved since • we were not able to make them work. We are still investigating what happened. • We had anyway many other 3D and diamond sensors to test and we were able to • complete our program easily on time thanks to the double spill structure at MTEST (Thanks!) • We will irradiate the detectors that we just tested at LANL at the end of June with a 800 MeV • proton beam but this time we will proceed one small step at a time. • In October we’ll be back at the MTEST to test these irradiated devices and to characterize • new prototypes • Finally, after we finalize our offline analysis programs, we’ll be able to characterize in detail • the detectors before and after irradiation! A special thank to Aria and all the Fermilab divisions involved in this effort!

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