shms gem tracker / readout system update - @let@token 0 · 2017-06-23 · the sru is read out using...

SHMS GEM Tracker / Readout System Update


Latif Kabir

Mississippi State University

Latif Kabir SHMS GEM Tracker / Readout System Update 1 / 15


Outline

1 GEM Tracker for SHMS2 Readout System for GEM3 GEM in the SHMS hut4 GEM Offline Analyzer5 Cosmic data with GEM6 Current status / Future plan


GEM Tracker for SHMS


SHMS hashorizontally-bendingsuperconducting dipolemagnet in front of the firstquadrupole magnet(Q1)

An active collimationsystem is needed

Collimator/Sieve + GEMTracker → Active Sieve

Provides the initial positionof the particle trajectory

The tracker is for opticalcalibration

Collimator/Sieve

GEM Tracker



Gas Electron Multiplier (GEM)

How GEM Works • Charged particles ionize gas in the drift volume

• Primary electrons drift to the GEM holes following the E-filed lines

• Electron multiplication due to the strong E-field in the holes

• Use of two to three layers in cascade results in high gain (up to 105 in triple GEM)

• Readout board collects charge

Figure:Latif Kabir SHMS GEM Tracker / Readout System Update 4 / 15


GEM Tracker

GEM tracker is a triple GEMchamberGas mixture: Ar/CO2 (70/30)Dimension: 160 mm × 160mm (153.6 mm × 153.6 mmactive area)Readout board 400 µm pitch Xand Y128 pins per APV

GEM Readout

•3 GEM foils : 160mm x 160mm (153.6mm x 153.6mm active area) •External dimension: 240mm x 240mm x 16mm •Readout board 400µm pitch X and Y •Panasonic connectors (128 pins per axis)

GEM tracker is a triple GEM chamber (Gas Mixture Ar/CO2 (70/30) )

8

A. Bressan et al, Nucl. Instr. and Meth. A425(1999)254

GEM Readout

•3 GEM foils : 160mm x 160mm (153.6mm x 153.6mm active area) •External dimension: 240mm x 240mm x 16mm •Readout board 400µm pitch X and Y •Panasonic connectors (128 pins per axis)

GEM tracker is a triple GEM chamber (Gas Mixture Ar/CO2 (70/30) )

8

A. Bressan et al, Nucl. Instr. and Meth. A425(1999)254


Readout System for GEM

Readout System for GEM

Scalable Readout System (SRS) developed by RD51 collaboration (CERN)Four basic parts: APV hybrids, ADC card, FEC card, SRU

CODA

The GEM DAQ System - SRS

•Uses the Scalable Readout System (SRS) developed by RD51 Collaboration (CERN ) •Four basic parts: APV hybrids, ADC card, FEC card, SRU

•SRS-APV25 hybrid cards mounted on GEM detector, each reads 128 channels •Data is digitized using the SRS-ADC unit and controlled by a Front End Concentrator (FEC) card.

•Each ADC and FEC combo can handle up to 16 SRS-APV cards (The GEM tracker will use a total of 6 APV cards handled by one FEC).

•A Scalable Readout Unit (SRU) communicates with the FEC cards. We use only one FEC. •The SRU is read out using CODA (using 10 Gb/s fiber link (originally used a 1 Gb/s copper link)

10

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Front End Concentrat

or (FEC)

Scalable Readout System was upgraded at JLab to make it compatible with CODA, 10 Gb/s fiber basedlink and to allow buffering.


GEM in the SHMS hut

GEM in the SHMS hut


GEM in the SHMS hut

GEM data in the integrated system

GEM readout control is under same CODA that controls other Hall C DAQsUses the trigger from same trigger supervisorGEM data is merged in the same data stream


Run config

ROC12

ROC12 event count

GEM in the SHMS hut

Latency scan with integrated system

A scintillator was attached near the GEMdetectorSignal from scintillator was used to form thecoincidenceA measurement was performed to guess theexpected trigger delay


GEM in the SHMS hut

Signal from GEM detector

fec_0_ch_5_raw_data

Entries 3240Mean 1640RMS 948

0 500 1000 1500 2000 2500 30000

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fec_0_ch_5_raw_data


fec_0_ch_5_raw_datafec_0_ch_4_raw_data


0 500 1000 1500 2000 2500 30000

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fec_0_ch_4_raw_data



Entries 3240Mean 1642RMS 949.7

0 500 1000 1500 2000 2500 30000

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fec_0_ch_3_raw_data


fec_0_ch_3_raw_data

fec_0_ch_2_raw_data


0 500 1000 1500 2000 2500 30000

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fec_0_ch_2_raw_data




0 500 1000 1500 2000 2500 30000

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fec_0_ch_1_raw_data




0 500 1000 1500 2000 2500 30000

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fec_0_ch_0_raw_data


fec_0_ch_0_raw_data

The lower three correspond to the APVs along X-axis and upper three correspond to the APVs alongY-axis.Between two vertical lines are the raw data for 128 channels during one 25 ns time sample.


GEM Offline Analyzer


GEM offline analyzer based on ROOTDoes the mapping and pedestalcorrectionProvides access to particle’s position,charge, energy etcAn initiative to integrate the standaloneGEM analyzer into Hall C analyzer is inprogress



Cosmic data (old) with GEM detector

We can get similar distribution with current data


GEM Shielding and Holder

GEM Shielding and Holder

Lead shielding and box for GEM are ready and in placeGEM & Shield Holder

Boron-poly shielding

Rail (tracker can slide and be retracted)

Lead shielding & Box

We need to build small enclosure next to Q2 to hold part of the readout systemLatif Kabir SHMS GEM Tracker / Readout System Update 13 / 15

Current status / Future plan

Current status / Future plan

Completed / In Place

GEM setup in the Hall C hut

Cosmic data in standalone mode

Integration of GEM readout control in thecombined Hall C CODA framework

Latency scan with GEM in the integratedsystem

Cosmic data with integrated SHMSsystems

Raw data decoder: Online and Offlineanalyzer

HV control program

In progress

Integrate analyzer with Hall C analyzer

Validation of the mapping using SHMShodoscope.

Building small enclosure next to Q2

Move GEM to designated position(Mounted on the holder)

Reconfirm the latency with small scintillatorin front of the HB

Optical Calibration

Timeline: Expect to accomplish by next month.


Acknowledgment

Acknowledgment

MSU: D. Dutta, K. Adhikari, M. ShabestariJLab: M. Jones, B. Sawatzky, E. Pooser, B. Moffit, B. RaydoUVA: K. Gnanvo, X. Bai, V. NelyubinFIU: C. Yero


shms gem tracker / readout system update - @let@token 0 · 2017-06-23 · the sru is read out using...

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