Beam test measurements of the Belle II vertex detector modules
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1 Beam test measurements of the Belle II vertex detector modules Tadeas Bilka Charles University, Prague on behalf of the Belle II Collaboration IPRD 2016, 3 6 October 2016, Siena, Italy
2 Outline Belle II SuperKEKB The Belle II Vertex Detector DEPFET Pixel Detector The Beast Phase II Commisioning Detector DESY Beam Test Hardware & Setup DAQ & HLT Tracking Alignment and Offline Software Outcomes of DESY Beam Test Conclusion 2
3 Belle II SuperKEKB KEK Laboratory, Tsukuba, Japan Assymetric e+e- ECMS=mY(4S) decays mainly to B-mesons B-Factory Upgrade of Belle@KEKB 40 x KEKB world record luminosity SuperKEKB under commisioning from Feb First collisions 2017 Full detector physics expected
4 Belle II Detector Rich physics program CP violation, tau physics, quarkonium spectroscopy... Experiment at precision frontier high statistics, Systematics reduced by improved detector Belle Belle II New Vertex Detector (VXD) Upgraded Central Drift Chamber (CDC) Upgraded forward calorimeter New PID Barrel: TOP quartz bars Endcap: ARICH New challenges High trigger rate 30kHz High background Inner pixel due too high occupancy in a strip Data flow/ storage/ processing 4
5 The Belle II Vertex Detector Pixel Vertex Detector (PXD) DEPFET technology (DEPleted Field Effect Transistor) 2 layers, 1st at 14mm from IP 8M pixels, 50 x (50 85)um2 Thickness 75um in active area Strip Vertex Detector (SVD) Large backgrounds, occupancy 4 layers of double-sided silicon strip sensors Pitch 50 75um in R-Phi, um in Z Thickness 320um Slanted sensor in forward region Data reduction (ROI) 5
6 DEPFET Pixel Detector Fully depleted active volume Internal in-pixel amplification Charge accumulated in Internal Gate (IG) Read-out on demand current in FET modulated by charge collected in IG ~ 500pA/e (~ 40nA/um MIP) Good S/N even for thin devices Reset by Clear contact remove charge from IG Rolling shutter read-out (20 us/frame) Charge collection in IG 4 rows at once Manufactored at MPS Semiconductor Lab 6
7 The Beast Phase II Commisioning Detector For machine commisioning (first collisions) and understanding unique environment of SuperKEKB radiation safe environment for VXD One ladder of full VXD Installation summer 2017 Beast Phase I already operational various radiation monitoring detectors no collisions Almost identical setup, including official software from DAQ, unpacking, tracking... to aligment developed for full experiment (with minor adjustments) was tested at DESY electron beam in April
8 DESY Beam Test VXD integration test enviromental monitoring, slow control, full readout chain, HLT tracking & ROI... Belle II software and analysis framework (basf2) from simulation to analysis Second time combined PXD+SVD in beam Electron/pozitron beam up to 6 GeV/c (similar to energy range in Belle II), rate up to 5kHz (@ 2 GeV/c) 1 T superconducing magnet (PCMAG) EUDET telescopes (20 um x 20 um pixels) Final Belle II design PXD first time in beam 8
9 Hardware & Setup Geometry of Beast Phase II Half-ladder of PXD, Full 4-layer SVD ladder CO2 cooling Forward + backward telescope arm 9
10 DAQ & HLT Tracking Scaled-down version of full DAQ Parallel event processing at HLT HLT track finding, fitting, ROI selection & merging Express reconstruction with combined PXD + SVD data online Belle II event display From Belle II event display: Track found in SVD, fitted and extrapolated to PXD by HLT. Selected ROIs shown in green. 10
11 Alignment and Other Software Mostly used common software developed for full experiment Testbeam package hosting geometry definition, field map and specialized features (e.g. EUDET integration and tracking) Alignment with Millepede II Linear least squares optimization for large number of parameters (not the case of beam test), simultaneous fit of track and alignment parameters (global fit) Integrated in basf2 for full VXD alignment Tracks re-fitted by General Broken Lines algorithm yields full covariance matrix of a track input for global alignment methods For beam test, only different configuration needed Included in calibration and alignment framework of basf2 Alignment constants (and more) stored in online database hosted by PNNL (USA), available for all analyzers Specialized modules for beam test DQM modules for quick analysis and cross-checks, for generation of masking of defect pixels/strips... 11
12 Outcomes of DESY Beam Test Total 340 runs in 4 weeks Stable operation at 3kHz (limited by machine and trigger scintilators) Both PXDs fully operational Only some tens of pixels masked Hitmaps with no magnetic field SVD hitmaps in direction of bending of particles in magnetic field Run with 1T field (peaks from electrons and secondary positrons) Some defective/noisy strips 12
13 Outcomes of DESY Beam Test SVD efficiency > 99 %, PXD efficiency > 95 % (inefficiency due to threshold cutting a bit into signal, detector not fully optimized) Comparison with simulation in basf2 Improved simulation parameters Cluster size agrees well with simulation Eff. (outer) = # matched Tracks from SVD with hit within 0.5 mm on inner 13
14 Outcomes of DESY Beam Test Alignment in x,y,z, in-plane rotation Momentum estimation (VXD only) after alignment Resolution studies with EUDET telescope - compatible with binary resolution (perpendicular tracks) * *Tracking resolution at SVD 3 ~ 7 um 14
15 Conclusion Combined PXD + SVD beam test with fully operational sensors with homogeneous response Operation under realistic environmental conditions -27 ºC) in electron beam and magnetic field Verified Beast Phase II setup Successfull system integration, coordination of several working groups (PXD, SVD, DAQ experts) Hitmaps, efficiencies, S/N, residuals close to expected Software from unpacking to tracking and alignment tested with real data conditions improved stability and fixed issues, input from experiment to improve sensor simulation Next beam test in Dec (last before Beast Phase II installation) 15
16 Thank you for your attention! 16
arxiv: v1 [physics.ins-det] 13 Dec 2018
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