Stony Brook ND group status Jose Palomino Chang Hwan Jang ( - - PowerPoint PPT Presentation

July 28 2017 1

Stony Brook ND group status

Jose Palomino Chang Hwan Jang (Chung-Ang Univ., Korea) Guang Yang

July 28 2017 2

Software

July 28 2017 3

DUNENDGGD

• Two new shapes have been added to the library.

July 28 2017 4

Done currently:

• included MainDetector class in “Detector module”, same function as

Primary and Secondary classes.

• General volume could be defined using GenSolid class under Active module.
• DLOE class has been moved to SubDetector module
• Generated a geometry with ArgonCube (3x3x4m active volume) + 20 cm

Aluminum box + Gar box

To dos:

• Inlcude more realistic Detector Enclosure
• Improve ArgonCube.

DUNENDGGD

July 28 2017 5

Analysis

July 28 2017 6

B-field in the tracker region

• Simple large HPG Ar TPC and STT volumes
• HPG: 10 times larger pressure than normal gas, i.e. 0.035 g/cc
• STT: Gas tube with Ar(75%) + CH4(15%) + CO2(10%) and Kapton tube.

HPGAr TPC tank Top view of Straw tube

B-field in the tracker region

July 28 2017 7

particle gun

• At the center left, shooting toward downstream.

Example of HPGAr 1T B-filed Muon

• Bending curve sagitta vs. travel length of different particles can be calculated.
• We can set B-field requirement for different charge separation efficiency.
• Compare performance of HPGTPC and STT.

B-field in the tracker region

July 28 2017 8

HPG STT

• First sense is that HPG and STT have similar charge separation ability.
• STT bending more significant but multiple scattering is also stronger,

they have trade-off effect.

• We will quantify the charge separation efficiency with different B-field as function
• f travel length. It helps to determine the B-field as well as the size of

STT/HPG detectors.

B-field in the tracker region

1 GeV muon 1GeV muon

July 28 2017 9

• Similar conclusion as before for muon.
• Will do 1,2,3,4,5 GeV cases.
• Will do muon and electron at least.

After this, may consider to continue B-field in liquid argon with lower priority.

B-field in the tracker region B-field in the tracker region B-field in the tracker region

HPG STT 2 GeV muon 2 GeV muon

July 28 2017 10

Neutrino-electron scattering in liquid Argon

• Only multiple scattering gives ~6% RMS.
• Discuss with people about this small value.

I require very strict E*theta^2 (even <0.1, we still have good statistics.) as we may have enough statistics.

• If I assign E*theta^2 < 1, which means E*theta^2 can

go to ~ 2*m_e , the RMS goes to ~20% or larger.

• Chris Marshall proposed some new definitions of

Electron angle as now I just use the first gamma emission point. Will update this definition. Not yet known how big this would impact the result. Due to larger mass, Xsec, POT and much lower threshold, ND LAr may have very good statistics. Therefore, we are systematics limited, so we can put very strict cut on E*theta^2.

July 28 2017 11

RHC mu+ momentum vs. cos(theta) FHC mu- momentum vs. cos(theta) cos(nu - muon) cos(nu - muon)

ROCK MUON

DUNE beam flux World (Rock) : 32 x 32 x 62 m Hall (Air) : 16 x 16 x 42 m from Mark’s 50% enlarged design 100 m A volume cut of 3 x 3 x 4 m were made to check the number

• f muon events passing

through.

• Although very energetic muons going forward, the spread is still significant.
• A 3D simulation with large number of events will be done to check the impact of air gap.
• Neutrino flux RMS at FD is 45km, which means the RMS at ND is ~ 20 m!

“LAr” muon momentum muon momentum