GArTPC configuration Jen Raaf, Alan Bross DUNE Near Detector WG - - PowerPoint PPT Presentation

Jen Raaf, Alan Bross DUNE Near Detector WG Meeting 2017/10/19

GArTPC configuration

LAr + GAr Possible Configuration

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• LArTPC with 11T FV (30T tot) will see ~50-100M νµ CC evts in 3 yr ν run

– Conclusions from Chris Marshall’s presentation at the 9/13 DUNE-ND meeting:

• Need ~3.25m in beam direction (set by hadrons) to contain 99% of events in 3-5

GeV Eν

• Transverse dimension could be ~2.5m (w/side µ tagger, otherwise need ~4m)
• Can extend GArTPC in drift direction to help tag & identify exiting particles

– Cost increase solely due to increase in magnetic volume

2x2x2 m3

LArTPC

(7m x 5m x 4.5m)

FV (~11T) 7m 5m

GArTPC

(5m x 4.5m x 3.5m)

ν

4.5m 5m

Central electrode

Mechanical concept for iron-dominated dipole

Working with ND mechanical engineering department to opJmize geometry, pressure vessel, etc. Katherine Cipriano & Barry Norris

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System Visualization

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Isometric view

• LAr cryostat:

– 7m wide x 5m deep x 4.5m tall – N.B.: rotated from configuration presented by ArgonCube group

• Gas TPC:

– 5m wide x 4.5m deep x 3.5m tall

• 5m: Drift direction,

2.5m drift from center electrode

• E parallel to B
• Pressure vessel:

– 6m long, 6.5m diameter

• This diameter gives

0.8m of space between TPC and vessel wall. Allows for possibility of EM Cal inside

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• Implementing geometries for GArTPC of reasonable size

inside magnet (now: dipole, soon: solenoid)

– Drift direction can be increased with no complications to TPC – Cost increase due to increased magnetized volume

• Largest effort for this concept is likely in mechanical

engineering

Summary

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Extra Slides

• Re-purpose ALICE readout chambers

– Existing chambers will be replaced in 2019 for High-lumi LHC

• In discussion with ALICE management
• Represents significant $$ contribution

– They have only operated at 1 ATM, but calculations indicated that

• peration at 10ATM looks possible without introducing electrostatic

instability

• Test stand now being setup at Fermilab using one of ALICE’s inner

readout chambers (IROC)

• Synergy with LArTPC

– Target nucleus

• Not 100% Ar, but 90% Ar + 10% CH4 or CO2 is certainly a possibility

– Also looking into Xenon (few ppm), N2 and H2 doping which may allow ~98% Ar target

– Raw 3-D data – Similar readout electronics architecture – Common data structure – Common pattern recognition, track finding, event recon. Algorithms – Light detection – Tricky

Our concept for HP Gas TPC

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