Swadhin Taneja Stony Brook University On behalf of Vertex detector team at PHENIX Collaboration 112/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6

Outline Physics goals of PHENIX experiment at RHIC. Physics motivations for Silicon Vertex Detector at PHENIX. Silicon VTX detector system: Strip-Pixel detector system Strip-Pixel silicon sensors Silicon Strip module Silicon Strip Ladder assembly Front End Electronics Ladder assembly and testing Results. Barrel assembly. 212/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6

12/2/20153 Physics Goals of PHENIX Spin structure of proton. PRL 103:012003,2009 Heavy Ion Physics. PRL 98:172301,2007

Physics from Silicon Vertex Tracker (VTX) for PHENIX VTX for PHENIX Central Arm. Heavy flavor (c and b quarks) are produced in the early stages of heavy ion collision. Separation of charm and beauty quark production. Large acceptance for jet kinematics reconstruction. γ+ jet measurement for accurate determination of gluon x. 4 VTX Mass (MeV) c  m) D0D D B0B B e Au D D X J/  B X  K e e-e- e+e+ -Displaced vertex (VTX)  < 40  m - Large acceptance (  and  < 1.2) e,  12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6

Pixel Stripixel Silicon VTX detector system Silicon VTX system consists of : 4 layers of silicon detectors 2 inner pixel hybrid detectors at radius R1=2.5 cm and R2=5cm. 2 outer strip-pixel detectors at radius R3=10 cm and R4 =14 cm. 2 big wheels to hold ladder transfer data boards (LDTBs) Cooling system for ladder assembly. 5 Silicon Barrels Big wheels 12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6

Silicon Strip Sensor (New technology: unique to PHENIX) The sensor is finely segmented detector with 80 μm x 1000 μm pixels. Each pixel region has two serpentine-shaped metal strips A metal strip connects those serpentines that are in a straight line (X-direction), second strip connects serpentines that are at 4.6 degree angle (U-direction). Sensor is 34.9 mm x 64.6 mm, with 6 sections of bond pads on either lateral edge, with 128 channels per section for a total 1536 channel per sensor. 612/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6

Silicon Strip Module Silicon Strip Module: a strip sensor and 12 SVX4 chips bonded to read-out- card (ROC). two sets of wire-bonds; SVX4 to board and 128 bonds from sensor pads to front-end of the SVX4. SVX4 chips are grouped into 3 and called a “hybrid”. a silicone-based encapsulation glue covering both sets of bonds for protection. 7 Top view Silicon sensor SVX4 chips ROC 8 bit ADC 128 channel / chip 3 mW / channel 12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6 Bottom view

Strip-Pixel Ladder Assembly 8 42 ladders built and tested successfully 12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6

RCC LDTB FEM The Front End Electronics The read out electronics: Readout control card (RCC) Flex circuit, two wings, controls timing of readout from SVX4. Ladder Data Transfer Board (LDTB) printed circuit board component, connects FEM to RCCs via BUS, provides power regulation for components on the ladder. Front End Module (FEM) Interface between DAq and LDTB, optical receiver for serialized data from LDTB, external clock signal to LDTB, FPGA for event by event pedestal correction. 912/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6

Ladder Testing Setup Ladder testing steps: Ladder sits in an air tight dark box. Nitrogen used to bring down the humidity. Coolant runs through from chiller to bring down the temperature. A low voltage of 5 V and a bias line of 200 V is supplied. Channel and ADC pedestal data is taken. 10 Ladder Bubbler Temp=0 deg C Humidity=0% Voltage=200V 12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6

Ladder Test results: Pedestal Distribution Raw ADC distribution (Online Analysis): 11 Channel Number (128 channels x 12 chips) 12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6

Ladder Test Results : Pedestal Distribution Corrected ADC distribution (Offline analysis): 12 Channel Number (128 channels x 12 chips) 12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6

Barrel progress 13 Barrel 3: ready WEST side Barrel #3 has 16 ladders (5 silicon modules per Ladder): 80 silicon modules EAST side 12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6

14 Barrel 4: ready WEST side Barrel #4 has 24 ladders (6 silicon modules per Ladder): 144 silicon modules EAST side Barrel progress 12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6

12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov VTX construction is complete – Move date to IR Nov. 10

VTX Silicon Detector status : Summary 1612/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6 Strip-pixel detector was built and successfully tested at the lab. It is moving to PHENIX-IR to take data for RUN-11 and beyond. Still to be done: Installation in PHENIX-IR Commissioning of the detector.

12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov Thank You

Auxiliary Slides 12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov Auxiliary Slides

Barrel Assembly 1912/2/2015S. Taneja -- DNP Conference, Santa Fe Nov 1-6 Front view of half barrel Back view of half barrel

12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov Silicon Module Using ROC-3: Silicon Module Using ROC-3: Excellent Charge Sharing For x channels For u channels Response to Electrons from 90 Sr Beta Source ➮ Response to Electrons from 90 Sr Beta Source HV(V) Pedestal 1  MPV S/N HV(V) Pedestal 1  MPV S/N

12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov Top module is rotated so that the read-out region overlaps. Scintillators Sensors Response to Muons from cosmic-rays ➮ Response to Muons from cosmic-rays The tracks have been observed from cosmic-ray

12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov Response to Proton Beam at 120 GeV (FNAL) ➮ Response to Proton Beam at 120 GeV (FNAL) Profile of the proton beam Pixel layers Stripixel layers Proton beam at 120 GeV Charged Sharing Principal of two-dimensional position sensitivity based on charge sharing works Annual RBRC Scientific Review

12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov Response to Proton Beam at 120 GeV (FNAL) ➮ Response to Proton Beam at 120 GeV (FNAL) HV(V) Pedestal 1  MPV S/N For x channels For u channels HV(V) Pedestal 1  MPV S/N Signal-to-Noise Ratio

12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov Response to Proton Beam at 120 GeV (FNAL) ➮ Response to Proton Beam at 120 GeV (FNAL) Single Event Tracking: Linear Fit Track Annual RBRC Scientific Review

12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov Response to Proton Beam at 120 GeV (FNAL) ➮ Response to Proton Beam at 120 GeV (FNAL) - Residual distribution (position resolution) X-stripixel 0.42 x 80 (  m) = 33.6 (  m) U-stripixel 0.44 x 80 (  m) = 35.2 (  m) - from the RMS values (tracks are defined by layers 1 and 3). - Tracking efficiency (detection efficiency) X-stripixel: /- 0.2 % U-stripixel: /- 0.2 % Tracking efficiency very good Annual RBRC Scientific Review

12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov Simulated Measurement with 0.4 nb -1

12/2/2015S. Taneja -- DNP Conference, Santa Fe Nov Silicon Sensor Cross section