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Hall A GEM Prototype Gas Distribution System
M. McMullen and the Detector Support Group10/12/2020
210/27/2020
Contents
Detector Support Group
• System components
• Distribution panels
• Readout setup
• Readout software
• Procurement status
• Project schedule
• Conclusion
310/27/2020
System Components
Detector Support Group
• Hardware components– Single ½” input gas line– Regulator panel
0–100 psi I2C absolute pressure transducers
– Eight-channel rotameter panel 100–1000 sccm and 50–500 sccm
– Eight-channel gas flow sensor chassis 750 sccm and 400 sccm
– Eight output ¼” gas lines
• DAQ components– Raspberry PI single board computer – Honeywell gas flow sensors – DSG multiplexer board– RJ-11 connectors and cables
410/27/2020
Distribution Panel – Front View
Detector Support Group
Regulator panel
Rotameter panel
Flow sensor chassis
Gas lines to flow sensors (1/4”)750-sccm rotameters 400-sccm channels
Input gas connector (1/2”)
510/27/2020
Distribution Panel – Rear View
Detector Support Group
Input gas connector (1/2”)
Regulator panel
Rotameter panel
Flow sensor chassis Gas lines from rotameter to flow sensors (1/4”)
610/27/2020
Readout Setup
Detector Support Group
1 2 3 4 5 6 7 8
Eight ¼” gas lines to GEMs
Pressure signals
Display
Regulator panel
Four ¼” gas line bundle
Four ¼” gas line bundle
Four ¼” gas line bundle
½” main input gas line
Manifold
Manifold
Single board computer Raspberry Pi
Display
Flow sensor chassis
Flow signals
High flow (750 sccm) Standard flow (400 sccm)
Pressure transducers
Prototype gas distribution system will supply Ar:CO2 for the GEM detectors in the BigBite Spectrometer
Rotameter panel
• 8-channel I2C Multiplexer (x1)• Flow sensor boards (x8)
710/27/2020
Readout Software
Detector Support Group
• Python-based gas flow readout software being developed using Raspberry Pi for DAQ• Pressure readback software development in progress• Measured flow for eight channels will be displayed• Local measurements to be displayed on Windows machine in assembly and testing area in EEL
810/27/2020
Procurement Status
Detector Support Group
Parts Needed for prototype In-hand
Gas Flow Sensor/Multiplexer Chassis
chassis 1 Y
400-sccm sensor board 4 Y
750-sccm sensor board 4 Y
multiplexer 1 N
1/4" gas line 10' Y
push-lock connections 16 Y
panel mount RJ-11 Connectors 2 Y
4-conductor cable 10' Y
6p4c connectors 20 Y
standoffs 36 Y
Regulator Panel
2u panel 1 Y
0–15 psi regulator 1 Y
I2C pressure transducer 2 N
4-channel manifold 2 Y
orifice 1 Y
relief valve 1 Y
Flow Meter Panel
2u panel 1 Y
100–1000 sccm rotameters 4 Y
50–500 sccm rotameters 4 Y
Data Acquisition
Raspberry Pi 4 kit 1 Y
level shifter 1 Y
910/27/2020
Project Schedule
Detector Support Group
Task Status Start date End date DSG staff
Procurement completed 08/01/20 09/28/20 Marc
Panel & chassis design completed 07/01/20 09/15/20 Tyler
Gas flow sensor board development completed 03/15/20 09/01/20 Marc, Peter, Brian
Multiplexer board development completed 04/16/20 10/09/20 Marc, Peter, Brian
Gas flow sensor & muxtiplexer board population not started 11/09/20 11/23/20 Mindy
Chassis internal cable fabrication not started 11/09/20 11/23/20 Mindy
Chassis assembly in progress 10/09/20 11/01/20 Marc
Software development in progress 09/07/20 11/23/20 Marc, Brian
Panel assembly not started 11/16/20 12/01/20 George
1010/27/2020
Conclusions
Detector Support Group
• Most components in–hand
• Readout programming underway
• Prototype expected to be ready by mid-December
1110/27/2020 Detector Support Group
Thank You
1210/27/2020
GEM Gas Flow Path
Detector Support Group
Ar/Co2
SupplyPressure
Regulator panelRotameter
panel8 Ch. Gas
Flow Sensor Chassis
Exhaust Gas Flow Sensor
8 lines½” ½”
¼”
Forward GEM
GEM
GEM
GEM
GEM
Forward GEM
Forward GEM
Forward GEM
Back
Exhaust Gas Flow Sensor
Exhaust Gas Flow Sensor
Exhaust Gas Flow Sensor
Exhaust Gas Flow Sensor
Exhaust Gas Flow Sensor
Exhaust Gas Flow Sensor
Exhaust Gas Flow Sensor
To Atm
To Atm
To Atm
To Atm
To Atm
To Atm
To Atm
To Atm
