Swadhin Taneja Stony Brook University On behalf of Vertex detector team at PHENIX Collaboration...

Swadhin TanejaStony Brook University

On behalf of Vertex detector team at PHENIX Collaboration

104/18/23S. 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.


04/18/23 3

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)

cm)

D0 1865 125

D 1869 317

B0 5270 464

B 5279 496

e

Au

D Au

D

X

J/B

X

K

e

e-e+

-Displaced vertex (VTX)

< 40 m- Large acceptance ( and < 1.2)

e,


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


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.


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


Bottom view

Strip-Pixel Ladder Assembly

8

42 ladders built and tested

successfully


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.


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 CHumidity=0%Voltage=200V


Ladder Test results: Pedestal Distribution

Raw ADC distribution (Online Analysis):

11

Channel Number (128 channels x 12 chips)


Ladder Test Results : Pedestal Distribution

Corrected ADC distribution (Offline analysis):

12

Channel Number (128 channels x 12 chips)


Barrel progress

13

Barrel 3: ready

WEST side

Barrel #3 has 16 ladders (5 silicon modules per Ladder): 80 silicon modules

EAST side


14

Barrel 4: ready

WEST side

Barrel #4 has 24 ladders (6 silicon modules per Ladder): 144 silicon modules

EAST side

Barrel progress


04/18/23S. Taneja -- DNP Conference, Santa Fe Nov 1-6 15

VTX construction is complete – Move date to IR Nov. 10

VTX Silicon Detector status : Summary


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-IRCommissioning of the detector.


Thank You


Auxiliary Slides

Barrel Assembly


• Front view of half barrel • Back view of half barrel


• Silicon Module Using ROC-3: Silicon Module Using ROC-3: Excellent Charge Sharing

For x channels For u channels

➮ Response to Electrons from Response to Electrons from 9090Sr Beta SourceSr Beta Source

HV(V) Pedestal 1 MPV S/N

200 9.41 87.8 9.3


200 9.41 91.2 9.7


Top module is rotated so that

the read-out region overlaps.

Scintillators

Sensors

➮ Response to Muons from cosmic-raysResponse to Muons from cosmic-rays

The tracks have been observed from cosmic-

ray


➮ Response to Proton Beam at 120 GeV (FNAL)Response to Proton Beam at 120 GeV (FNAL)

Profile of the proton beam

Pixel layersStripixel layers Proton

beam at 120 GeV

Charged Sharing

Principal of two-dimensional position sensitivity based on charge sharing works Annual RBRC Scientific Review




200 9.6 98.6 10.3

For x channels For u channelsHV(V) Pedestal 1 MPV S/N

200 10.1 102.2 10.1

Signal-to-Noise Ratio



Single Event Tracking: Linear Fit Track

Annual RBRC Scientific Review



- 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: 99.5 +/- 0.2 % U-stripixel: 98.9 +/- 0.2 %

Tracking efficiency very

goodAnnual RBRC Scientific Review


Simulated Measurement with 0.4 nb-1


Silicon Sensor Cross section

Swadhin Taneja Stony Brook University On behalf of Vertex detector team at PHENIX Collaboration...

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