Status of the PANDA MVD Project Intro Physics with the MVD Design: mechanics and electrics R&D: soft and hard (INFN-Torino) Kai-Thomas Brinkmann, 2nd PANDA Russia Workshop, Apr 26, 2010

EM/hadron EM calorimeter TOF system calorimeter Dipole DIRC Cherenkov PANDA EMC TDR (arXiv:0810.1216v1) http://www-panda.gsi.de/archive/public/panda_tdr_EMC.pdf EM calorimeter IP driftchambers DIRC Cherenkov TOF system µ counters MVD Solenoid Dipole EM/hadron calorimeter p RICH central tracker PANDA Magnets TDR http://www-panda.gsi.de/archive/public/P_magn_TDR.pdf 26-04-10 KTB PANDA Russia

Introduction Si detectors: Si technology: Ultimate spatial resolution Limited energy loss information High count rate capability Small material budget Si technology: Chip design: mainstream technology All kinds of commercial processes available Radiation-hard designs and design tools available Customized geometries Integrated readout Inherently fast readout Digital when required 26-04-10 KTB PANDA Russia

The PANDA Micro-Vertex Detector Design adopts state-of-the-art silicon sensor techniques Focus on PANDA specific issues: High and asynchronous interaction rate Strongly asymmetric angular distributions Versatile experimental requirements D meson ID Minimum mass budget Solutions: Heterogeneous design (pixel and strip sensors) Very compact design Limited number of space points / layers (default 4) Novel readout electronics (non-triggered readout) Tracklets real-time (fast on-line processing) 26-04-10 KTB PANDA Russia

The PANDA MVD Project Silicon pixel sensors Silicon strip sensors Small pixel cells – 100 x 100 µm2 Specialized custom hybrid  ToPix Features: - .13 µ technology - ToT to retain (some) energy information - Fast handling for high data rates - “Untriggered” readout of data - Rad hard within “typical” limits - Minimum material load  sensor technology Silicon strip sensors Less traversed material than pixels, smaller number of channels Features: - Pitch of 50 – 150 µm - Double-sided sensors, 200 µm thick - Specialized solution for front-end 26-04-10 KTB PANDA Russia

PANDA physics performance report , available as arXiv:0903.3905v1 Many open questions in strong (non-perturbative) QCD - charmonium - hybrids, glueballs and exotics - open charm Chiral symmetry in SU(3) and hadron mass modifications - hadrons in the nuclear medium Hypernuclei: “3rd dimension“ of the chart of nuclides Electromagnetic channels and processes (generalized parton distributions, e-m formfactor of the proton in the time-like regime , virtual Compton scattering, Drell-Yan) baryon spectroscopy, mixing/CP violation in the charm sector, rare decays, antiproton physics at low energies 26-04-10 KTB PANDA Russia

Physics with the MVD Many open questions in strong (non-perturbative) QCD - charmonium - hybrids, glueballs and exotics - open charm Chiral symmetry in SU(3) and hadron mass modifications - hadrons in the nuclear medium Hypernuclei: “3rd dimension“ of the chart of nuclides Electromagnetic channels and processes (generalized parton distributions, e-m formfactor of the proton in the time-like regime , virtual Compton scattering, Drell-Yan) baryon spectroscopy, mixing/CP violation in the charm sector, rare decays, antiproton physics at low energies 26-04-10 KTB PANDA Russia

(cc) also have considerable branching ratios involving KK Physics with the MVD Secondary vertices from delayed decays: D meson reconstruction D+ + K- (cc) also have considerable branching ratios involving KK Hyperons (e.g. (excited) Ω´s) and kaons (KS) Heavy baryons (e.g. Λc) Slow charged pions and kaons 26-04-10 KTB PANDA Russia

Physics with the MVD Secondary vertices from delayed decays: D meson reconstruction reconstructed decay length reconstructed D mass 26-04-10 KTB PANDA Russia

Physics with the MVD ε ≈ 40% > 5∙104 events per PANDA year + K- D+ 26-04-10 KTB PANDA Russia

Physics with the MVD Secondary vertices from delayed decays: D meson reconstruction Vertex reconstruction with very high resolution 26-04-10 KTB PANDA Russia

Physics with the MVD Secondary vertices from delayed decays: Features: D meson reconstruction vertex reconstruction with very high resolution Features: Energy loss at intermediate energies Seeding for outer tracking Large impact on momentum reconstruction Elastic scattering 26-04-10 KTB PANDA Russia

Physics with the MVD Secondary vertices from delayed decays: Features: D meson reconstruction vertex reconstruction with very high resolution Features: Energy loss at intermediate energies Seeding for outer tracking Large impact on momentum reconstruction 26-04-10 KTB PANDA Russia

Design 26-04-10 KTB PANDA Russia

p beam hydrogen pellet or cluster jet target 10 cm 06-11-09 KTB Uppsala 10 cm

Technical detector layout “v1.0“ - all components specified Design Technical detector layout “v1.0“ - all components specified 26-04-10 KTB PANDA Russia

Design 4 barrels: 6 forward disks: - 2 inner layers: pixels - 2 outer layers: strips 6 forward disks: - 4 pixels - 2 mixed disks Pixels : 12M channels, 0.14 m2 Strips : 200k channels, 0.5 m2 26-04-10 KTB PANDA Russia

Design Simulations 26-04-10 KTB PANDA Russia

Design Simulations         Support Silicon Components Routing 10-1  10-2 10-3   10-2 10-3 Silicon  Components 10-1 10-2 10-3   Routing   1 10-1 10-2 26-04-10 KTB PANDA Russia

Standard hybrid technology Design: Pixels Hybridization: Pixel module 100 μm Standard hybrid technology 100 μm 26-04-10 KTB PANDA Russia

Pixel Readout ToPix 2.0: - Reduced scale prototype. - Designed in CMOS 0.13 μm technology 384 pixel cells in four columns: 2 short c’s with 32 pixels 2 folded c’s with 128 pixels Simplified end-of-column logic 16 pixels with wire bonding pads 31 32 63 95 64 96 127 128 pixel column: 12.8 mm. Final ToPiX: - Matrix of 116x110 cells, pixel size 100x100 μm2 - 1.28 cm2 active area. 26-04-10 KTB PANDA Russia

Pixel Readout Pixel cell layout, ToPiX v3 Per cell: Front-end amplifier Leakage compensation 5 bit DACs (threshold tuning) Comparator 12 bit configuration register One register for leading edge One register for trailing edge In the present implementation, most of the space reserved to the analog part, but… 100 µm 70+30 μm Analog Digital 26-04-10 KTB PANDA Russia

Design: Strips Strip sensors trapezoidal (disk) , 70 µm, 15° rectangular (barrel) , 130 µm, 90° 26-04-10 KTB PANDA Russia

readout along sensor sides Design: Strips Hybridization: Strip module readout Disk part Barrel part readout along sensor sides readout short strips 90° bend at top pitch adapter frontend smd readout long strips 26-04-10 KTB PANDA Russia

Design: Strips Strip super-module r/o and cooling Barrel part Disk part Barrel part Support Cooling 26-04-10 KTB PANDA Russia

Design: Mechanics Light-carbon support structures Overall integration concept Tests and prototypes 26-04-10 KTB PANDA Russia

Mechanics Detector support Simulation of end rings and cross frame asymmetric displacement safety factor of 2 included Cross Frame 26-04-10 KTB PANDA Russia

gluing: 2 foam disks w/t embedded cooling pipes Mechanics Cooling concept - Coolant: water (18°C) - Under-pressure mode using hydrostatic pressure CAD disk layer carbon foam cutting drilling and baking gluing: 2 foam disks w/t embedded cooling pipes 26-04-10 KTB PANDA Russia

Hardware Low-mass cables - Al cables on thin dielectric High-bandwidth data transmission 1m prototypes under study 1.2 mil Al 5.1 mil PA 0.6 mil Al 26-04-10 KTB PANDA Russia

Strip Sensor Tests Setup of a tracking station Add‘l tests: ELSA electron beam, 3.2 GeV 26-04-10 KTB PANDA Russia

Strip Sensor Readout Development of a fast readout chain with data manipulation capacity 26-04-10 KTB PANDA Russia

Strip Sensor Readout PANDA readout schematics Several frontends on one link depending on occupancy EoC reads up to 4 (8) FE chains, reduces amount of data (clustering, priority matching) and buffers - Multiplexed output sends data optically 26-04-10 KTB PANDA Russia

Strip Sensor Readout Free-running frontend for Si strips: solution in the works Development of self triggered frontend @ GSI based on existing n-XYTER Free-running autonomous hit detection Bandwidth-focussing token ring readout 26-04-10 KTB PANDA Russia

Summary The MVD concept: needs continued R&D. has to undergo add‘l iterations with simulation. has reached a technical level. meets the design specifications. R&D as well as the realization of the micro- vertex detector needs expert manpower. 26-04-10 KTB PANDA Russia

26-04-10 KTB PANDA Russia