Challenges and Opportunities in DHCAL Technology for Neutrino Experiments

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DHCAL for Neutrinos
 
Jos
é
 Repond
Argonne National Laboratory
 
2
 
Situation
 
Funding for any DHCAL activities has been 
abruptly terminated 
by the
  beginning of FY2015 (October 2014)
 
The DOE and Argonne management have since 
limited all activities
, such as
  further developments, participation at meetings etc.
 
In February the DOE requested a 
White Paper 
on future use of the DHCAL technology
 
Three experiments 
have expressed interest in using the existing DHCAL layers or
  the technology
 
In addition, we have made some progress with the development of 
fast RPCs
 
3
 
Measurement of the neutron yield of neutrino interactions in Gadolinium-doped Water
 
     
understanding neutrino-nucleus interactions
     
addressing limiting factor in proton decay searches (neutrino induced backgrounds)
Number of neutrons depends on
 
     a) Type of interaction
     b) Momentum transfer
 
The DHCAL will be used to measure the direction and energy of outgoing muons
 
Deployment later this year?
 
4
 
5
 
Measurements to be done with ANNIE
 
Produced neutron(s)
 
  Measured with Large Area Picosecond Photo Detectors (LAPPDs)
    and conventional phototubes
 
Outgoing muon
 
  a)  Measured with Scintillator-based Muon Range detector
 
            
 crude angular resolution
            
 large solid angle
 
  b) Measured with DHCAL layers + additional absorber plates
 
             
 much improved angular resolution
             
 limited angular acceptance
             
 can be moved to cover different solid angles
 
6
 
Depth of DHCAL
 
Energy of muons estimated through their 
range
 in the DHCAL
 
Maximum energy about 1.6 GeV
 
 
DHCAL Total Thickness = 4.252*50 layers=212.6 g/cm
2
 
Range/M = 212.6 [g/cm
2
/GeV] …M is the mass of the particle
 
From PDG 
 
213 [g/cm
2
] stops ~0.5 GeV/c muons
                                   1.6 GeV muon stops in ~950 [g/cm
2
]
 
Need additional 50 layers of 2 cm steel to absorb 1.6 GeV muons (cost ~ $25k)
 
7
 
Revamp and prepare the DHCAL
 
A)
Study loss of efficiency problem
 
          Cross-correlate efficiency measurement with physical layer
          Measure surface resistivity
          Propose solution
 
B)
Prepare solution to board-bending problem
 
          Design some matting to insert into the cassettes
          Test if readout boards can be made to be flat again
 
C)
Disassemble all 50+ layers and reassemble with proper solutions
 
D)
Design and build new absorber structure
 
8
 
Short Baseline Neutrino Detector - SBND
 
Planned neutrino detector
 
      On Fermilab site – 110 m from Fermilab Booster
      Part of an ensemble of neutrino detectors at different baselines
 
Main detector
 
      
Liquid Argon Time-projection Chamber
 
Physics motivation
 
      Search for CP violation in the lepton sector
      Understanding of experimental anomalies at short-baselines (e.g. LSND effect)
      Search for oscillations to sterile neutrinos
 
9
 
The Detector Concept
Catho
de
Plane
Assembly
Liquid
Argon
Anode
Plane
Assembly
 
10
 
Muon Spectrometer
 
Role
 
   Identify cosmic ray tracks
 
Traditional cosmic ray rejection
 
   If track present, veto DAQ for a certain amount of time
 
Improved muon spectrometer
 
   Track muons and exclude only area in vicinity of track
 
DHCAL technology
 
    RPCs with 1 x 1 cm
2
 
pad readout
    Attractive solution for tracking muons in 3D
    50 Layers available corresponding to ~15  m
2
          (Assuming 3 layers deep)
 
Time scale
 
     First data taking in 2018?
SBND
 expressed
interest
 
11
 
Measurement
 
  Neutrinos from reactor
 
Goal
 
  Establish neutrino mass hierarchy
  Measure neutrino mixing angles
   + observe supernova neutrinos
   + study atmospheric, solar and geo neutrinos
 
Time scale
 
   Construction to start in 2014
   To be completed in 2019
 
12
 
Detector Concept
 
13
 
Muon Tracking
 
Tracking muon versus veto
 
   Reduced dead time
 
Area
 
   1,600 m
2
 
DHCAL technology
 
   Ideally suited
   Need to build factor of 3x32 more (assuming 3 layers)
   Only cover central region?
JUNO
 expressed
interest
 
14
 
Conclusions
 
After the DHCAL program 
was terminated
 
   Being asked to explore possibilities to re-utilize technology
 
Several projects 
show interest
 
    ANNIE
    SBND
    JUNO
 
15
 
Addendum: High-rate RPCs
 
Semi-conductive glass plates
 
   Several 20 x 20 cm
2
 plates in hand
   Bulk resistivity measured to be R
bulk
 ~6.3 × 10
10
 
Ω
cm
      (in comparison, float glass, as used for the DHCAL, has R
bulk
 ~ 4 10
13
 
Ω
cm)
 
Fast RPCs
 
   2 chambers almost completely assembled
 
Fermilab tests
 
   Planned for early May, 2015
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Funding cuts have impacted DHCAL activities for neutrino research, leading to limited progress. However, there is interest in utilizing existing technology for neutron yield measurements and muon energy evaluations. Efforts include addressing neutron interactions, optimizing materials, and revamping DHCAL efficiency and structure.

  • Neutrino Experiments
  • DHCAL Technology
  • Funding Cuts
  • Neutron Yield
  • Muon Energy

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  1. DHCAL for Neutrinos Jos Repond Argonne National Laboratory

  2. Situation Funding for any DHCAL activities has been abruptly terminated by the beginning of FY2015 (October 2014) The DOE and Argonne management have since limited all activities, such as further developments, participation at meetings etc. In February the DOE requested a White Paper on future use of the DHCAL technology Three experiments have expressed interest in using the existing DHCAL layers or the technology In addition, we have made some progress with the development of fast RPCs 2

  3. Measurement of the neutron yield of neutrino interactions in Gadolinium-doped Water understanding neutrino-nucleus interactions addressing limiting factor in proton decay searches (neutrino induced backgrounds) Number of neutrons depends on a) Type of interaction b) Momentum transfer The DHCAL will be used to measure the direction and energy of outgoing muons Deployment later this year? 3

  4. 4

  5. Measurements to be done with ANNIE Produced neutron(s) Measured with Large Area Picosecond Photo Detectors (LAPPDs) and conventional phototubes Outgoing muon a) Measured with Scintillator-based Muon Range detector crude angular resolution large solid angle b) Measured with DHCAL layers + additional absorber plates much improved angular resolution limited angular acceptance can be moved to cover different solid angles 5

  6. Depth of DHCAL Energy of muons estimated through their range in the DHCAL Maximum energy about 1.6 GeV I Material Thickness Density [g/cm3] Thickness [g/cm2] X0 Copper 2 mm 8.960 1.792 0.14 0.013 Steel 2 mm 7.874 1.574 0.11 0.012 Glass 2 mm 2.230 0.446 0.07 0.005 Teflon 3 mm 2.20 0.440 0.09 0.007 Total 4.252 0.41 0.037 DHCAL Total Thickness = 4.252*50 layers=212.6 g/cm2 Range/M = 212.6 [g/cm2/GeV] M is the mass of the particle 213 [g/cm2] stops ~0.5 GeV/c muons From PDG 1.6 GeV muon stops in ~950 [g/cm2] Need additional 50 layers of 2 cm steel to absorb 1.6 GeV muons (cost ~ $25k) 6

  7. Revamp and prepare the DHCAL A) Study loss of efficiency problem Cross-correlate efficiency measurement with physical layer Measure surface resistivity Propose solution B) Prepare solution to board-bending problem Design some matting to insert into the cassettes Test if readout boards can be made to be flat again C) Disassemble all 50+ layers and reassemble with proper solutions D) Design and build new absorber structure 7

  8. Short Baseline Neutrino Detector - SBND Planned neutrino detector On Fermilab site 110 m from Fermilab Booster Part of an ensemble of neutrino detectors at different baselines Main detector Liquid Argon Time-projection Chamber Physics motivation Search for CP violation in the lepton sector Understanding of experimental anomalies at short-baselines (e.g. LSND effect) Search for oscillations to sterile neutrinos 8

  9. The Detector Concept Cathode Plane Assembly Anode Plane Assembly Liquid Argon 9

  10. Muon Spectrometer Role Identify cosmic ray tracks Traditional cosmic ray rejection If track present, veto DAQ for a certain amount of time Improved muon spectrometer Track muons and exclude only area in vicinity of track DHCAL technology RPCs with 1 x 1 cm2 pad readout Attractive solution for tracking muons in 3D 50 Layers available corresponding to ~15 m2 (Assuming 3 layers deep) SBND expressed interest Time scale First data taking in 2018? 10

  11. Measurement Neutrinos from reactor Goal Establish neutrino mass hierarchy Measure neutrino mixing angles + observe supernova neutrinos + study atmospheric, solar and geo neutrinos Time scale Construction to start in 2014 To be completed in 2019 11

  12. Detector Concept 12

  13. Muon Tracking Tracking muon versus veto Reduced dead time Area 1,600 m2 DHCAL technology Ideally suited Need to build factor of 3x32 more (assuming 3 layers) Only cover central region? JUNO expressed interest 13

  14. Conclusions After the DHCAL program was terminated Being asked to explore possibilities to re-utilize technology Several projects show interest ANNIE SBND JUNO 14

  15. Addendum: High-rate RPCs Semi-conductive glass plates Several 20 x 20 cm2 plates in hand Bulk resistivity measured to be Rbulk ~6.3 1010 cm (in comparison, float glass, as used for the DHCAL, has Rbulk ~ 4 1013 cm) Fast RPCs 2 chambers almost completely assembled Fermilab tests Planned for early May, 2015 15

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