Updates June 26, 2015
Xiaqing Li
1
Beam induced BG simulation
Upgrade the geometry of target cell and cryostat
Modify cross section to include gamma rays beam
Submit jobs to Duke cluster
Adapt analysis program for the cluster output
Check the offset and angle of every detector in the Gamma Vault
Two problems occurred: one solved, the other under study
2
Problem A: lead nose blocks the beam
3
Problem A: lead nose blocks the beam
4
5
HINDA Offset: 74cm -> 84cm
LD target
Lead target
6
Problem B: no significant difference between the
energy deposition for the two cases
Energy deposition for LD target
Event number
Energy deposition for lead target
Energy/ MeV
7
Event number
Energy deposition for lead target—no
significant difference form LD target
Energy/ MeV
8
To do
• Solve problem B
• Modify lead shields geometry
• Include energy resolution in simulation
• Simulate Compton scattering from liquid 4He
• Update Compton on proton/deuteron simulation with latest cross
section model including 𝛼, 𝛽 and get Compton events count rate
Event number
With Liquid D2 only
Energy/ MeV
10
Event number
With Liquid D2 and all surroundings
Energy/ MeV
11