X,Sun1USTC discussion, Oct 15, 2010 STAR STAR Heavy Flavor Tracker Upgrade --Status of PXL Detector Xiangming Sun Lawrence Berkeley National Lab L. Greiner,

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Presentation transcript:

X,Sun1USTC discussion, Oct 15, 2010 STAR STAR Heavy Flavor Tracker Upgrade --Status of PXL Detector Xiangming Sun Lawrence Berkeley National Lab L. Greiner, H. Matis T. Stezelberger M. Szelezniak C. Vu H. Wieman …

X,Sun2USTC discussion, Oct 15, 2010 STAR Outline Heavy Flavor Tracker upgrade in STAR at RHIC Fast Simulation of Detector Performance Monolithic Active Pixel Sensor PXL Readout Electronics Power Consumption and Cooling test Summary

X,Sun3USTC discussion, Oct 15, 2010 STAR STAR Detector at RHIC RHIC (Relativistic heavy ion collider) Brookhaven National Lab STAR(the solenoidal tracker at RHIC ) is one of Detector at RHIC. It specializes in tracking the thousands of particles produced by each ion collision

X,Sun4USTC discussion, Oct 15, 2010 STAR Physics Goals heavy ion collision generate a very hot and dense medium Charm particle is proposed to probe medium property Direct Topological reconstruction of Charm Detect charm decays with small c , including D 0  K  m  Method: Resolve displaced vertices ( microns)

X,Sun5USTC discussion, Oct 15, 2010 STAR Inner Detector Upgrades TPC – Time Projection Chamber (main tracking detector in STAR) HFT – Heavy Flavor Tracker SSD – Silicon Strip Detector r = 22 cm IST – Inner Silicon Tracker r = 14 cm PXL – Pixel Detector r = 2.5, 8 cm We track inward from the TPC with graded resolution: TPCSSDISTPXL ~1mm~300µm~250µm vertex <30µm

X,Sun6USTC discussion, Oct 15, 2010 STAR PXL Detector Ladder with 10 MAPS sensors (~ 2×2 cm each) 2 layers: 2.5,8 cm 10 sectors 1+3 ladders/ sector Mechanical support with kinematic mounts

X,Sun7USTC discussion, Oct 15, 2010 STAR Some PXL Parameters LayersLayer 1 at 2.5 cm radius Layer 2 at 8 cm radius Pixel patch size18.4  m X 18.4  m Hit resolution10  m rms Position stability6  m rms (20  m envelope) Radiation thickness per layer X/X0 = 0.37% Integration time (affects pileup) 200  s Number of pixels0.2 ms 436 M Radiation tolerance300 kRad Rapid detector replacement < 8 Hours critical and difficult more than a factor of 2 better than other vertex detectors (ATLAS, ALICE and PHENIX)

X,Sun8USTC discussion, Oct 15, 2010 STAR Fast Simulation of Detector Performance detector layer 1 detector layer 2 r2r2 r1r1 true vertex perceived vertex xx xx vv Position resolution: 1, Effective pixel Size : 2, Multiple Coulomb Scattering Line assumption: using line created by two points in two layers to calculate dispersion from true vertex. Consistent with full Geant simulation Free parameters : Pixel resolution Detector thickness

X,Sun9USTC discussion, Oct 15, 2010 STAR Position Resolution vs Significance Significance= signal (signal+background) 1/2 ______________ Effective pixel size=21.5um It includes: pixel patch size 18.4um thermal distortion 4.5um cooling vibration 10um D0 momentum=1GeV/c

X,Sun10USTC discussion, Oct 15, 2010 STAR Detector Thickness vs Significance X/X0=0.58% It includes: first layer thickness 0.37% beam pipe thickness 0.21% (Beryllium) D0 momentum=1GeV/c

X,Sun11USTC discussion, Oct 15, 2010 STAR Association Rate vs Pointing Resolution and Hit Density Nhits per sensor=250 for 200us integration time Pointing resolution=250um Association rate=80% Association rate: associating hits to tracks from outer detector

X,Sun12USTC discussion, Oct 15, 2010 STAR Monolithic Active Pixel Sensors IPHC-DRS (former IRES/LEPSI) proposed using MAPS for high energy physics in 1999 Standard commercial CMOS technology Sensor and signal processing are integrated in the same silicon wafer Proven thinning to 50 micron Signal is created in the low-doped epitaxial layer (typically ~10-15 μm) → MIP signal is limited to <1000 electrons Charge collection is mainly through thermal diffusion (~100 ns), reflective boundaries at p-epi and substrate → cluster size is about ~10 pixels (20-30 μm pitch)‏ Room temperature operation MAPS pixel cross-section (not to scale)‏

X,Sun13USTC discussion, Oct 15, 2010 STAR From Analog to Binary Readout Digital readout – offers increased speed but requires on-chip discriminators or ADCs and increased S/N for on-chip signal processing Analog readout – simpler architecture but slower readout

X,Sun14USTC discussion, Oct 15, 2010 STAR MAPS Integration Time = Readout Time Typical sensor readout –“rolling shutter” mode. –Integration time = array readout time Column parallel readout architecture –All columns readout in parallel and then multiplexed to one output –Integration time = column readout time –Integration time = 200 us

X,Sun15USTC discussion, Oct 15, 2010 STAR PXL Readout Electronics 2 m (42 AWG TP) 6 m (24 AWG TP) 100 m (fiber optic) 4 ladders per sector 1 Mass Termination Board (MTB) per sector 1 sector per RDO board 10 RDO boards in the PXL system RDO motherboard + Xilinx Virtex-5 Dev Board RDO PC with DDL link to RDO board Mass termination board + latch up protected power daughtercard ← Front Back ↓

X,Sun16USTC discussion, Oct 15, 2010 STAR RDO System Design – Physical Layout 1-2 m Low mass twisted pair 6 m - twisted pair Sensors / Ladders / Sectors (interaction point) LU Protected Regulators, Mass cable termination RDO Boards DAQ PCs (Low Rad Area) DAQ Room Power Supplies Platform 30 m 100 m - Fiber optic 30 m USB Control PCs 30 m 400MB/s

X,Sun17USTC discussion, Oct 15, 2010 STAR Firmware Structure 17 DDL/USBPC sensor Xilinx Virtex-5 Dev Board

X,Sun18USTC discussion, Oct 15, 2010 STAR IO Delay for Digital Data Alignment 800 channels, 160 MHz digital signals pass 8 meters and 3 buffering stages before arriving FPGA. digital need to be aligned in FPGA end. Solution: FPGA iodelay function Status Data Path Architecture Validated Measured BER (bit error rate) of <

X,Sun19USTC discussion, Oct 15, 2010 STAR System Control Command generator: command.exe Hex file usb.exe download_data_block_to_FEE 0x0402fffd 0x1d82ff3f 0x1502ffcf 0x2642ffff 0x2642fdff 0x2202feff 0x0c03fff0 0x1547ffff 0x1547ffdf 0x0cc7ffff …………. DAQ PC DAQ PC rorc_receive getdata Control PC Control PC

X,Sun20USTC discussion, Oct 15, 2010 STAR Power Consumption and Cooling Test Setup Sensor: 170 mW/cm 2 → 270 W for PXL sensors 2 W/drivers/cable → 80 W for PXL drivers Silicon heater put on ladder

X,Sun21USTC discussion, Oct 15, 2010 STAR Cooling Tests at ~360 W – IR Images Air 13.8 m/sHot spots ~37 °C Air 10.1 m/s Hot spots ~41 °C Air 4.7 m/s Hot spots ~48 °C Air temperature ~27 °C From infra-red camera

X,Sun22USTC discussion, Oct 15, 2010 STAR Vibrations Caused by Airflow Beginning of the driver section (Supported end) End of sensor section (Unsupported end) Using capacitance sensor to measure vibration

X,Sun23USTC discussion, Oct 15, 2010 STAR We have a well advanced mechanical design that is in the process of being verified by simulation and prototyping. The prototype RDO system is performing well. Sensor development with IPHC is on schedule and we expect the first prototype final sensor delivery in The ladder cable development is on schedule and we are evaluating the ITB performance with the full compliment of 10 working sensors. Summary Our current status: The PXL is expected to be fully installed in 2013 for RHIC Run14

X,Sun24USTC discussion, Oct 15, 2010 STAR

X,Sun25USTC discussion, Oct 15, 2010 STAR

X,Sun26USTC discussion, Oct 15, 2010 STAR

X,Sun27USTC discussion, Oct 15, 2010 STAR Summary Effective pixel size 21.5 um Layer thickness X/X0=0.37% Air speed 10.1m/s Sensor max temperature 41 °C Vibration xx um(included in Effective pixel size) The integration time 200 us Hit density during integration 250 Association rate 80% Readout Electronics match the requirement Our current status: The PXL is expected to be fully installed in 2013 for RHIC Run14 Please give status

X,Sun28USTC discussion, Oct 15, 2010 STAR

X,Sun29USTC discussion, Oct 15, 2010 STAR PXL Detector Ladder with 10 MAPS sensors (~ 2×2 cm each) Mechanical support with kinematic mounts Cabling and cooling infrastructure New beryllium beam pipe (800 µm thick, r = 2.5 cm)‏ 2 layers 10 sectors 3+1 ladders/ sector

X,Sun30USTC discussion, Oct 15, 2010 STAR Direct measurement has not been done so far. Based on estimates ( dose straus oct 2007 HW.ppt) and TLD projection. For the radius of 2.5 cm: –Ionizing radiation: Total dose: 155 kRad TLD projection: 300 kRad –Non-ionizing radiation average pion count for 1 Yr: 3x1012 cm-2 TLD projection (pion assumption): 12x1012 cm-2 Radiation Environment

X,Sun31USTC discussion, Oct 15, 2010 STAR Ionizing Radiation Tolerance MIMOSA-22 Testing in 10 KeV X-Rays in Lab MIMOSA-22ter Signal/noise ratio >=20 after 300 kRad Ionizing radiation (300 e+e- pairs) Non-ionizing radiation is under investigation

X,Sun32USTC discussion, Oct 15, 2010 STAR The Heavy Flavor Tracker (HFT) is an upgrade project for the STAR detector at RHIC, It will allow the topological reconstructions of the heavy flavor hadrons via their hadronic decays. The HFT consists of three coaxial detectors: SSD(Silicon Strip Detector), IST(Intermediate Si-Tracker) and PXL(a pixel detector). The PXL is the inner-most and highest precision detector in HFT. The sensor chip we use to build PXL is developed in Monolithic Active Pixel Sensor(MAPS) technology. Each sensor has 1024X1188 pixels with 18.4 micron pitch and 50 micron thickness. The integration time is 200 us. Correlated double sampling (CDS) and digitization are performed on the sensor chip. The readout electronics is designed to handle 400 sensors which are grouped in 10 sectors. In this talk, we discuss the relation between the physics goals and sensor characteristics, such as pixel size, sensor thickness, integration time, radiation tolerance and power consumption. We introduce the on-chip electronics design to perform CDS and digitization. We also show the readout electronics designed to handle R&D tests and physics data acquisition. The PXL is expected to be fully installed in 2014 for RHIC Run14

X,Sun33USTC discussion, Oct 15, 2010 STAR Initial testing with ~75 μm travel past touchdown 30 μm additional lowering of probe pins Phase-1 discriminator transfer functions ƒ(threshold voltage) observed on two of the probed sensors : Sensors designed with dedicated probe pads in the sensor pad ring. 13 full-thickness, diced sensors probe tested. Up to 3 probe tests on a sensor. We will begin testing thinned sensors within the next few days Status Automated and scripted system for sensor testing is in place. Vacuum chuck for handling up to twenty 50 μm thick sensors is being tested Ongoing sensor testing Probe Tests

X,Sun34USTC discussion, Oct 15, 2010 STAR Cooling tests at ~360 W Initially: 100 mW/cm 2 → 160 W for PXL sensors Updated: x1.7→ 270 W for PXL sensor 2 W/drivers/cable → 80 W for PXL drivers Ladder section Measured resistance (Ω) Current (A) Voltge (V) Power (I·V) (W) sensors Sector 1 (Pt heaters) Sectors || drivers Sectors Sectors Total Power ~361

X,Sun35USTC discussion, Oct 15, 2010 STAR Institut Pluridisciplinaire Hubert Curien IPHC-DRS (former IRES/LEPSI) proposed using MAPS for high energy physics in 1999 CMOS & ILC group today –6 physists –9 microcircuit designers –6 test engineers –7 PhD students CNRS - IPHC, Strasbourg-Cronenbourg More than 30 prototypes developed – several pixel sizes and architectures (simple 3-transistor cells, pixels with in-pixel amplifiers and CDS processing) – different readout strategies (sensors operated in current and voltage mode, analog and digital output) – Large variety of prototype sizes (from several hundreds of pixels up to 1M pixel prototype with full-reticule size) MIMOSA (Minimum Ionizing particle MOS Active sensor)

X,Sun36USTC discussion, Oct 15, 2010 STAR PXL Hardware Architecture RDO motherboard Mass Termination Board Ladder