Characterization of the Strip Front-End ASIC of the PANDA ... · PANDA Experiment Micro Vertex...

Characterization of the Strip Front-End ASIC of the PANDA MVD with the JDRS

18.03.2019 | DPG SPRING MEETING, ALESSANDRA LAI

PANDA Experiment

● Cooled p beam @HESR- 1.5 GeV/c < p < 15 GeV/c- Δp/p < 10-4

● Study strong interaction - Multi-s and c hadron spectroscopy- Exotic states- Nucleon structure- pA collisions

p

Target

Target Spectrometer Forward Spectrometer

1

PANDA Experiment● Cooled antiproton beam @HESR

- 1.5 GeV/c < p < 15 GeV/c- Δp/p < 10-4

● Study strong interaction - Multi-s and c hadron spectroscopy - Exotic states - Nucleon structure - pA collisions


Target

p

2

PANDA Experiment

● Cooled antiproton beam @HESR- 1.5 GeV/c < p < 15 GeV/c- Δp/p < 10-4


➙ Precise event timing➙ Charged particles tracking - primary and displaced vertices

Target


p

3

PANDA Experiment

Micro Vertex Detector




Target

p


4

PANDA ExperimentMicro Vertex Detector

40 cm

● Spatial resolution < 100 μm● Time resolution < 10 ns● Continuous readout

Si hybrid pixels Si micro strips




Target

p


5


40 cm






Target

p


6

● Custom front-end chips➙ ToPix, PASTA


40 cm





Versatile data acquisition system for the different front-end prototypes


Target

p


7



40 cm





Versatile data acquisition system for the different front-end prototypes


Target

p


8


Jülich Digital Readout System

PASTA and JDRS

PASTA● Time-over-threshold: time + charge measurement - low threshold: leading edge time stamp - high threshold: deposited charge

9

Self trigger capability

Number of channels 64

Frequency 160 MHz

Time resolution 6.25 ns

3.4 mm X 4.5 mm

PASTA

sensor

PASTA and JDRS


3.4 mm X 4.5 mm

PASTA

sensor



Frequency 160 MHz


10

PASTA and JDRS


3.4 mm X 4.5 mm

PASTA

sensor



Frequency 160 MHz


JDRS

● Data flow- Encoded event data in PASTA- First processing and storing in FPGA register- Transfer to PC and further processing

11

PASTA and JDRS


3.4 mm X 4.5 mm

PASTA

sensor



Frequency 160 MHz


JDRS

● Data flow- Encoded event data in PASTA- First processing and storing in FPGA register- Transfer to PC and further processing

12

Integration of PASTA in the JDRS

● Former version of JDRS (ToPix) - Lack of modularity and flexibility

13



14



● Restructuring of the code- Use multiple interconnected modules - Separate reusable modules from ASIC specific connect

to FPGA read

data

display GUI

send data

config ASIC

decode data

15



● Restructuring of the code- Use multiple interconnected modules - Separate reusable modules from ASIC specific

● Communication to and from PASTA- Configuration operations- Data collection and processing

config ASIC

connect to FPGA

read data

send data

display GUI

decode data

16





64 channels

21

para

mete

rs

connect to FPGA

read data

display GUI

send data

config ASIC

decode data

17





More than 1000 parameters to tune

21

para

mete

rs

connect to FPGA

read data

display GUI

send data

config ASIC

decode data

64 channels

18





More than 1000 parameters to tune

21

para

mete

rs

Automatic routines

connect to FPGA

read data

display GUI

send data

config ASIC

decode data

64 channels

19

Evaluation of the Performance of PASTA● Internal injection

- Channel response

reduced εin 10% of ch

20

Evaluation of the Performance of PASTA● Internal injection

- Channel response- Threshold calibration - differential scheme (th

+- th

- ≥ 0)


21

Evaluation of the Performance of PASTA

Good linearityResiduals within detector resolution

● Internal injection- Channel response- Threshold calibration - differential scheme (th

+- th

- ≥ 0)

- Linearity of the front-end

Single channel


ToT Distribution VS Pulse Amplitude

pulse amplitude [fC]

tim

e-o

ver-

thre

shold

[ns]

resi

duals

22




+- th

- ≥ 0)

- Linearity of the front-end● Proton beam

Single channel



23




+- th

- ≥ 0)


Single channel



24




+- th

- ≥ 0)


- Frequency-dependent response

Single channel



25




+- th

- ≥ 0)



Non-flat ε across the channels ➙ threshold effects Single channel



26




+- th

- ≥ 0)



Similar patterns per chε reduced @50 MHz

Single channel



27




+- th

- ≥ 0)




Single channel



28




+- th

- ≥ 0)



Single channel



29




+- th

- ≥ 0)



Single channel



30




+- th

- ≥ 0)



Single channel



31




+- th

- ≥ 0)



ε reduced above 80 MHz Single channel



32




+- th

- ≥ 0)




Single channel


Non-flat ε across the channels ➙ threshold effects

ε reduced above 80 MHz

● Data acquisition system- Modular integration of PASTA in the JDRS- User-friendly GUI- Stable operation (incl. in-beam)

● PASTA- Principle of operation verified- Operation of individual channel- Critical optimization of global settings- Frequency-related issues- Significant input for PASTA 2.0


33

Characterization of the Strip Front-End ASIC of the PANDA ... · PANDA Experiment Micro Vertex...

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