GArTPC configuration Jen Raaf, Alan Bross DUNE Near Detector WG Meeting 2017/10/19
LAr + GAr Possible Configuration 5m 4.5m LArTPC (7m x 5m x 4.5m) 7m GArTPC (5m x 4.5m x 3.5m) FV (~11T) ν 5m Central electrode 2x2x2 m 3 • LArTPC with 11T FV (30T tot) will see ~50-100M ν µ 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 E ν • 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 2 October 19, 2017 DUNE Near Detector Weekly Meeting
Mechanical concept for iron-dominated dipole Working with ND mechanical engineering department to opJmize geometry, pressure vessel, etc. Katherine Cipriano & Barry Norris 3 October 19, 2017 DUNE Near Detector Weekly Meeting
System Visualization 4 October 19, 2017 DUNE Near Detector Weekly Meeting
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 5 October 19, 2017 DUNE Near Detector Weekly Meeting
Summary • 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 6 October 19, 2017 DUNE Near Detector Weekly Meeting
Extra Slides
Our concept for HP Gas TPC • 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 operation 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% CH 4 or CO 2 is certainly a possibility – Also looking into Xenon (few ppm), N 2 and H 2 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 8 October 19, 2017 DUNE Near Detector Weekly Meeting
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