Poster presented at the IEEE Conference 2010 in Knoxville. It shows results for charged particle tracking using single-crystalline diamond pixel detectors

Hollingsworth, Matt

Spanier, Stefan M

English

University of Tennessee, Knoxville: Trace

University of Tennessee, KnoxvilleTrace: Tennessee Research and CreativeExchangePhysics and Astronomy Publications and OtherWorks Physics and AstronomyFall 11-2010Diamond Particle DetectorsStefan M SpanierUniversity of Tennessee - Knoxville, sspanier@utk.eduMatt HollingsworthUniversity of Tennessee - Knoxville, hollings@cern.chFollow this and additional works at: http://trace.tennessee.edu/utk_physastrpubsPart of the Elementary Particles and Fields and String Theory CommonsThis Poster is brought to you for free and open access by the Physics and Astronomy at Trace: Tennessee Research and Creative Exchange. It has beenaccepted for inclusion in Physics and Astronomy Publications and Other Works by an authorized administrator of Trace: Tennessee Research andCreative Exchange. For more information, please contact trace@utk.edu.Recommended CitationSpanier, Stefan M and Hollingsworth, Matt, "Diamond Particle Detectors" (2010). Physics and Astronomy Publications and OtherWorks.http://trace.tennessee.edu/utk_physastrpubs/8P IP P Beam Halo 175 cm 4.45 cm 4mm 4mm 7.5cm PLT Telescope ArrayUniversity of Tennessee, Rutgers University, HEPHY-Vienna, Vanderbilt University, Princeton University, CERN Resolution Studies of Single-Crystal Diamond Pixel DetectorsCMS Pixel Luminosity Telescope (PLT)Installed symmetrically on both sides of the interaction pointThe PLT is a dedicated luminosity monitor for CMS based on single-crystal diamond pixel sensors. It consists of two arrays of eight small-angle telescopes situated one on each end of the CMS experiment at CERN.   Diamond Sensors -> stable operation over the lifetime of CMSSpatial ResolutionSingle-Crystal CVD DiamondSingle-Crystal CVD Diamond ✓ No need for cooling ✓ High radiation tolerance ✓ High charge mobility ✓ Capable of surviving up to 2 x 1015 protons/cm2 ✓ Full charge collection at < 0.1 V/umAdvantagesDiamond sensors are ideal for detectors which are exposed to high radiation environments, such as those found in modern high energy physics experiments.Single-crystal diamond is the preferred sensor material rather than polycrystalline diamond since the pulse height distribution of single crystal diamond is large and well separated from zero, ensuring that any efficiency changes due to threshold drifts will be small.Diamond Pixel Detectors Ir Bumps-100 VB Diamond Sensor500 µm EMin Ionizing ParticleReadout Chip (ROC)ShaperSample/HoldComparatorsig > thr?hitData BuerTriggerRadiation Damagee-e-e-e- e-e-e- e-e-e-e-e-e-e-Pixel Hits, Row, Column, Charge depositPSI46 Pixel Chip - External SpecificationReadoutIllustration 13: Overlay of all pixel and column address levels. The picture has been taken at 40 Mhz readoutspeed with a PSI46 (version 1). The DC-levels of PSI46 (version 2) will be according to Table 4. The addressbits are preceeded by ultrablack/black/last DAC value.07.07.2005 - Page 22 of 27© Paul Scherrer Institut - CH - 5232 Villigen PSILevel 5ultrablackblacklast DAC Level 3Level 4Level 2    C1  C0   A2  A1  A0  signalLevel 1Level 0A Fully Assembled Detector Plane. The spatial resolution was measured by utilizing a silicon microstrip telescope provided by the University of Zurich, which was inserted into a 10 GeV/c proton beam at the CERN PS .Zurich Beam Telescope ✓ Silicon microstrip detector ✓ Intrinsic Resolution: 2µm ✓ Resolution Achieved: 10µm ✓ 4 independent X/Y planesThe PSI46 chip consists of an array of 52 x 80 pixels with a pitch of 150 µm x 100 µm.  Each pixel features individual pixel threshold/mask settings, full analog readout of the pixel hit address and charge deposit, as well as a column-multiplicity signal (known as the Fast-OR), which indicates the number of double columns that had pixels over threshold in each bunch crossing.  Fast-OR signals are read at the full bunch-crossing rate of 40 MHz clock, while the full pixel information, consisting of the row and column addresses and the pulse heights of all pixels over threshold, is read out at a lower rate of a few kHz.PSI46 Pixel Readout Chip / ndf 2χ 24.32 / 29Constant  2.23± 39.84 Mean      0.001220± 0.002391 Sigma     0.00095± 0.02722  [mm]plt - xtrackx-0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08Number of Entries051015202530354045 / ndf 2χ 32.28 / 27Constant  3.41± 72.89 Mean      0.0007874± 0.0006029 Sigma     0.00066± 0.02157  [mm]plt - ytracky-0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08Number of Entries01020304050607080The x and y residuals for 2-hit clusters.  Residuals for the PLT were defined as  where xtrack is calculated as a linear fit through the silicon strip detector, and xpltis given by the equation  where Qi is the charge in each pixel of the cluster in the PLT, xi is the column address of the pixel, and the sum is over the number of hits in the corresponding cluster.  The formula for y is analogous to these formulas.  The measured resolution is significantly improved over the expected digital resolution of ∆X = 43 µm and ∆Y = 29 µm. Single-Crystal CVD diamond has a charge collection distance of ~500 µm The readout electronics have a lifetime of ~3 years of LHC running conditions 36 e-hole pairs are generated per MIPAll hits are buffered, but only triggered hits are read out The PLT is designed to provide a high-precision measurement of the bunch-by-bunch relative luminosity at the CMS collision point on a time scale of a few seconds and a stable high-precision measurement of the integrated relative luminosity over the entire lifetime of the CMS experiment. The telescopes consist of three equally-spaced planes of diamond pixel sensors with a total telescope length of 7.5 cm. They are located 5 cm radially from the beam line at a distance of 1.8 m from the central collision point with a small angle pointing towards the collision point.Deposition of the pixel electrode pattern on the diamonds and the bump-bonding of the diamond sensors to the pixel readout chips were performed at the Princeton Institute of Science and Technology Materials (PRISM) micro-fabrication laboratory.  Following surface preparation, electrodes were sputtered onto the diamond surface using a Ti/W alloy target as an under bump metalization (UBM). A 4 mm x 4 mm electrode was deposited on one side of the diamond using a shadow mask. On the other side, a pixel pattern was deposited using a standard lift-off photolithographic process. Single-Crystal CVD diamond charge deposit from a Sr90 source (~minimum ionizing)Charge deposit from Sr90 for Poly-Crystal CVD DiamondThreshold [e-]2000 2500 3000 3500 4000Number of Pixels/40 e-0100200300400500 threshold*65threshold*65Before TrimmingAft r TrimmingTypical threhold settings for the PSI46 readout chip. The thresh-old of 3000 e- is well separated from the Single-Crystal MPV of ~18000 e-.A fully assembeled PLT Telescope

Diamond Particle Detectors

https://trace.tennessee.edu/cgi/viewcontent.cgi?article=1002&amp;context=utk_physastrpubs

Diamond Particle Detectors

Abstract

Similar works

Full text

Available Versions

University of Tennessee, Knoxville: Trace