dune near detector meeting– tifr · 2020-04-17 · -very good charged particle tracking via the...

Alan BrossDUNE Collaboration Call April 17th, 2020

DUNE Near Detector meeting– TIFR

Workshop Focus

• This workshop addressed the technical needsof the DUNE near detector complex. Ofparticular interest was the discussion of thecollaborative effort that will be required inorder to deliver the components of the multi-purpose detector (MPD) system: the HPgTPCand its pressure vessel, the magnet systemand the muon tagger/ID system.

• https://indico.ino.tifr.res.in/indico/event/577/

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AGENDA

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AGENDA (Thurs. afternoon)

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AGENDA

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AGENDA

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Pressure VesselBARC design

• Design well advanced• Material (Al) source

identified– Meets spec of < 0.5 X0

thickness• BARC confident that they

can fabricate in India

HPgTPC Pressure Vessel Nomenclature

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ECAL Baseline Design• Octagonal geometry- Small side length ~2.3m, Large side

length ~2.6m, Width ~1.5m- Total surface ~ 120 m2 at inner face- Total weight ~ 200t (Barrel) + ~95t

(Endcap)• Layers- 8 High granularity layers with tiles of

2.5x2.5x5 cm3 with SiPM- 52 Low granularity layers with strips of

4 cm width readout on both sides• Based on simulation studies- Energy resolution ~ 5-6%/Sqrt(E)- Angular resolution ~ 6.4 deg/Sqrt(E)- Neutron detection eff. ~ 40%

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Magnet Options• At the DESY WS, it was decided to freeze the reference

design in its current form and move onto alternate designs• Motivation- Save space along beam direction

• 8.4m ➛ ~ 7.5m• Reduce cost

• Options- 2 or 3-coil Helmholtz design with partial return yoke (PRY)- Solenoid with PRY (SPY)

• In both stored E ~ 40% of reference design- Remember Cost ~ (E)0.8

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Magnet Reference Design (CC-option)

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Running off cryo-coolers still a possibility.

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Design Option-2: Three coil Helmholtz Configuration

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Stored Energy ~ 30 MJ

BARC

3-Coil Option- Magnetic Field

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3-Coil Option with Partial Return Yoke

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3-Coil with PRY, field profile

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Developing Designs: Solenoid w/ Partial return Yoke (SPY)

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Genoa &Fermilab

Solenoid w/ Partial return Yoke (SPY)

• Central Field = 0.5T• 4 identical coils, single

layer• ~1500 x 20 mm2 each• ~3660 mm radius• 45 MJ of stored energy- C($) ~ (E)0.8

• Overall width ~ 8m

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Andrea Bersani

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SPY detail

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Don Mitchell

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Muon system – active element• Several Indian Institutions are involved in the GEM assembly for

Compact Muon Solenoid (CMS) detector at CERN.• GE1/1 - GEM detector installed in CMS to enhance muon

trigger and reconstruction capabilities.- GE1/1 - the G stands for GEM and the E for Endcap; the ring of the

station

• Assembly sites for GE1/1 in India include -- Panjab University, ChandigarhDelhi University

- Bhabha Atomic Research Centre (BARC, Mumbai)

- Saha Institute of Nuclear Physics (SINP, Kolkata)

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Jyoti TripathiPunjab Univ.

GEM Assembly

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Computing resources at TIFR• Some of the “D0 Farm” compute nodes became the Simulation Cluster

for INO, still in use!- Facility for ~28 INO Collaboration member institutions- ~ 25 PhDs, many more currently using

• Neutrino physics, simulation and mini-ICAL data analysis• Purchase order placed for (~0.95M USD)- 8 compute nodes

• 512 CPU cores (in form of 32 core AMD EPYC 7551)• 6 GB RAM per core, 2TB NVMe , 25GbE NIC

- 1260TB storage (raw HDD)- Expected delivery before 31 March- Expect to be fully operational 3 weeks after delivery

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MPD: Indian participation• BARC is already heavily involved- Taking on the responsibility for the HPgTPC PV-Member of magnet system team-Offered engineering design help on ECAL• Many opportunities (both hardware and

software) for university groups

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MPD: Indian University participation • Hardware- µ-tagging system- ECAL module production- Magnet instrumentation

• In software and physics analysis there are many opportunities to make critical and important contributions- HPgTPC, ECAL, Magnet system (µ-tagger)- Plus many areas to contribute to the LBL general

analysis group

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MPD: Indian participation/contributions

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SAND• The focus of the was the MPD, but we did had one session on

SAND:- SAND Reference Design overview Luca Stanco

- 3DST configuration & physics Guang Yang

- Physics of STT Roberto Petti

- STT R&D and physics studies in India Bipul Bhuyan

• This session was helpful in bringing many of the participants from India up to speed with regard to the status of SAND reference design plus options

• Still large interest in the STT physics program among Indian university groups. Large presence at the meeting

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Plan for STT Production in India• Plan to set up a production site in India for the production of

the Straws for the STT.- Will be done in collaboration with colleagues at JINR and

elsewhere. Discussion already in progress.

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Bipul BhuyanIIT

STT in India• The STT based tracker volume will significantly enhance the

physics capability of the DUNE-ND complex.- Very good charged particle tracking via the STT, good charged

separation.

- Good momentum/energy resolution via STT/ECAL. Sufficient for SAND to act as the beam monitoring detector.

- Good hadron discrimination, muon-ID via RPC or plastic scintillator-based muon detector.

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SAND• The discussion was very focused on what needs

to be done to move forward with SAND.• ACTION ITEMS- Identify a specific topic and present and end-to-end

analysis.• Nuclear effects and flux impact on and the oscillation

analysis- Hydrogen x-section for example

- Present detailed physics comparison of the SAND options

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Conclusion

A very productive meeting!

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Back UP

HPgTPC Pressure Vessel’s components Design

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Currently, no show-stoppers

Modified SPY Design

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Modified PV Design II

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Replace hemispherical heads with flat plates

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Developing Designs: Solenoid w/ Partial return Yoke (SPY)

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Proposed TPC vessel design

• Support legs need to be redesigned

• Available space between coils is very small

• Vessel to support E-Cal?

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Developing Designs: Solenoid w/ Partial return Yoke (SPY)

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