Kondo GNANVO University of Virginia (UVa) Update on GEM Activities for the 12 GeV Program in Hall A...

Kondo GNANVO

University of Virginia (UVa)

Update on GEM Activities for the 12 GeV

Program in Hall A at JLab

K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

Outline

• GEM trackers for the Super BigBite Spectrometer (SBS)

• APV25-MPD Readout for SBS

• Test of APV25 systems at UVa.

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Super Bigbite Spectrometer (SBS) in Hall A @ JLab


Large luminosity

Moderate acceptance

Forward angles

Reconfigurable detectors

• General Purpose Spectrometer for 12GeV DIS and SIDIS experiments

• High Luminosity Spectrometer: 1038 /cm2/s, High background: 500 kHz/cm2 (low energy photons mainly)

• General Purpose will be used in different configurations for 12GeV nucleon elastic form factor and SIDIS experiments

• Forward angle, Large acceptance, Good angular and momentum resolutions: 0.2 mrad, 0.5% @ 4-8 GeV/c

• General Purpose Spectrometer for 12GeV

DIS and SIDIS experiments

• High Luminosity Spectrometer: 1038 /cm2/s,

High background: 500 kHz/cm2 (low

energy photons mainly)

• General Purpose will be used in different

configurations for 12GeV nucleon elastic

form factor and SIDIS experiments

• Forward angle, Large acceptance, Good

angular and momentum resolutions: 0.2

mrad, 0.5% @ 4-8 GeV/c

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K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY 4


APV25-MPD Readout Electronics for SBS

GEM FEC 4.0 MPD DAQ

75 mm

49.5

mm

Passive backplane(optional)

2D r

ead

ou

t

Up to 40mtwisted,shielded

copper cable(HDMI)tested

Main features:

• Use analog readout APV25 chips

• 2 “active” components: Front-End card and VME64x custom module

• Backplane acting as signal bus, electrical shielding, GND and mechanical support

• Flex adapters available for “standard” PANASONIC GEM connectors.

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APV25 FE Card• APV25 chip on Front End card based on COMPASS original design

• Bus like digital lines (CLOCK, trigger and I2C) & Low Voltages

• Single differential line for the ANALOG out

• ZIF connectors on the GEM side

• 800 front-end cards needed

Digital IN/OUT + LV

Analog output

ZIF

C

onnectors

Diode protection against spark

APV25Chip

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MPD: Multi Purpose Digitizer• MPD VME controller hosts the

digitization of the analog signals coming from the front-end card.

• Handle all control signals required by the front end cards (trigger/clock/I2C)

• Compliant to the JLab/12 VME64x VITA 41 (VXS) standard

• Designed with the possibility to detach the ADC subcomponent to extend FEC-VME64x distance (expected to be ~7 m)

• 50 modules required

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APV25-MPD DAQ Software

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APV25-SRS Readout Electronics

Main features of the Scalable readout System (SRS):

• 3 main components: APV25 Front-End card and ADC card + Digitizer board

•Data transfer through Gb Ethernet via UDP using DATE software developed by ALICE DAQ

•Decoder + basic data analysis with AMORE Framework provided by ALICE DAQ

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MPD data

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X-axis t1

Y-axis t1

X-axis, t1 + 25 ns

Y-axist1 + 25 ns

X-axis t1 + 50

Y-axis t1 + 50

X-axis, t1 + 75 ns

Y-axist1 + 75 ns

X-axis t1 + 100 ns

Y-axis t1 + 100 ns

X-axis, t1 + 125 ns

Y-axist1 + 125 ns


APV25-SRS raw data

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25 ns time samples

128 ADC channels


Offline correction of the Common mode

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Pedestal rms• Common mode baseline varies with time sample

• This effect is corrected in AMORE software both for pedestal data and event data as well


SRS Electronics: pedestal rms vs. nb of time samples

4

7.7

3.2

5.2

3 time samples 6 time samples

9 time samples 12 time samples

AD

C C

ount

sA

DC

Cou

nts

AD

C C

ount

sA

DC

Cou

nts

ADC channels

ADC channels

ADC channels

ADC channels

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Pedestal rms: SRS vs. MPD

ADC counts ~ 15

ADC Counts

ADC channels

5.2

AD

C C

ount

s

ADC channels

SRS

MPD

• Pedestal rms 3 times higher for the MPD w.r.t SRS

• This effect could be in part because the common mode baseline is not yet integrated in the MPD decoder software


X/Y Charge sharing: SRS vs. MPD

MPD

MPD

SRS

SRS

Summary


Have both APV based SRS and MPD Electronics setup at UVa APV25-MPD is the readout system for the SBS GEM trackers Both system are working properly and the performances are comparable We have about 5K electronic channels available with the 2 system Data APV25-MPD system have a higher noisy in part because of common mode baseline

offset not correct

To do Develop apv25 FE card with Panasonic connectors for MPD system Develop a more robust analysis software package for MPD electronics. Integration of the APV25-SRS and APV25-MPD into JLab DAQ system (CODA)

GEM Team @ Univ. of Virginia


Senior Research Scientist:

Prof. Nilanga Liyanage, Dr Vladimir Nelyubin

Research Scientist:

Dr Kondo Gnanvo

Students:

Kiadtisak Saenboonruang, Chao Gu, Xinzhan Bai, Taylor Sholtz, Seth Saher …

SBS Coll. Colleagues in Italy

INFN Roma (Sanita)

Dr. Evaristo Cisbani

INFN Catania

Prof. Vincenzo Bellini

INFN Genova

Dr. Paolo Musico

Backup


K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY 20

SRS Electronics: pedestal rms evaluation


Pedestal rms (ADC Counts)

APV0 APV1 APV2

APV3 APV4 APV5

APV6 APV7 APV8

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Kondo GNANVO University of Virginia (UVa) Update on GEM Activities for the 12 GeV Program in Hall A...

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