LArIAT and LBNE

LBNE R&D BriefingMay 12, 2014


The Long-Baseline Neutrino Experiment

LArIAT and LBNE

Jim Stewart

LArIAT EPAG Chair

BNL

LBNE LARIAT-EPAGJ. Stewart BNLT. Junk FNALB. Rebel FNALJ. Urheim IU

LBNE R&D Briefing - May 12, 2014 2

The LArIAT experiment

• LArIAT is a test beam experiment designed to measure details of the detector response to charged particles of known energy and type.– Only earlier LAr-TPC test beam was T32 at JPARC. 1cm

readout strip and limited statistics. Kaon data.– LArIAT will be the first precision charged particle test beam!

• The experiment is being assembled at FNAL Test Beam Facility (FTBF).

• The experiment is foreseen as taking place in several phases– Phase I renovate the ArgoNeuT TPC and add a new

cryogenics system.– Phase II will re-use the cryogenics system and add a larger

TPC to provide hadronic shower containment.

• Phase I should take data starting in 2014• Phase II could take data starting in late 2016


LArIAT Test Beam Particles and Particles in LBNE

• Test beam provides good coverage for beam physics and proton decay.• LBNE’s requirements for SN and atmospheric need to be defined.

– How LArIAT can contribute needs to be investigated.

LArIAT beam setup Particles in the LBNE Detector


Summary Phase I differences to LBNE

LArIAT Phase I

• Two instrumented planes • 4 mm wire pitch• 60° wire angle collection• 60° wire angle induction• BNL Front end preamp and

CAEN digitizers• Default Drift Field 500 V/cm• Max drift time 295 μs• Similar particle coverage

LBNE

• Three instrumented planes• 5 mm wire pitch• Vertical collection• 45° or ~35° stereo angle• BNL front end, cold ADC,

LBNE prototype readout• Drift Field 500 V/cm• Max drift time 2160 μs• Similar particle coverage

The performance of the LArIAT TPC will be measured, but a MC model will be needed to extrapolate to the LBNE geometry!


Goals of LArIAT Phase I

• Measure the detector response dE/dx to known particles p e± π± k± and photons– Precision measurement of the collected charge as a function of

particle type and energy. • Measure visible energy deposition for different particles and

energies.

• Determine the detection efficiencies and PID likelihoods• Investigate vertex fitting and tracking.

– 0.28 – 1.28 X0 radiator for investigating γe±


LArIAT Phase I goals

• Single track calibration• Electron and photon shower separation• Charge sign determination from decay topolpgy• Particle Identification by dE/dx and range

– proton to kaon identification efficiency and purity/rejection factor

– k to π/μ identification efficiency and purity/rejection factor

• Pion/Kaon Argon interactions cross sections• Antiproton decay with full event topology


Sources of Detector Performance Estimates

• Detector response is presently based on the ICARUS performance (different geometry) and limited statistics visual scans of simulated data.


Other things they could do

• Study planes with different wire pitch and angle• Rotate the detector• Move the detector to a higher energy beam• Photon Beam???


http://arxiv.org/pdf/1306.1712.pdf



The Long-Baseline Neutrino Experiment

LArIAT Phase II


LArIAT Phase II

• The details of the phase II detector have not yet been fixed and the experiment is open to feedback.

• Detectors with typical size of 1 m radius and 3 m length are presently considered.– Such a detector will contain 90% of the total pion energy on

average and at least 20% of those pions will have 95% of their energy contained.

• The effect of the limited containment for hadron showers on the ability to define the LBNE detector precision has not been studied in detail.– Studies examining the impact of the missing energy should be

performed.

• Having a large library of events generated from known particles will be very useful in developing the Monte Carlo simulations.– Will provide a wealth of hadron interaction data which will

provide input to GEANT.


LBNE Detector Requirements and Present Uncertainties


Precision Detector Calibration

• A detector calibration measurement should be performed with a detector as similar to the final detector as possible.– Wire pitch, angle, plane spacing, field configuration,

readout electronics should be near final.– The configuration for LBNE will likely only be fixed around

CD-3.– International contributions may include entire detectors

which could imply more than one configuration. – Cold Digital readout is still in development and will not be

finished until after CD-3.

Will define the time scale when an LBNE calibration measurement can be performed.


Possible Calibration Measurements

• LArIAT phase II – Stand alone test beam experiment. Availability is no issue.

Hadronic showers only contained at 90% level. Input on the setup should be provided by LBNE.

– Long term availability provides flexibility in the testing program.• WA 104 (T150)

– Funding still under negotiation. 3 m by 10 m will give good containment. May not be available if short baseline program goes forward.

• WA 105– Primarily for development of the two phase detector. – Negotiating installing pre-production prototypes of the LBNE

TPC. Will give best calibration measurement as it is with the final detector.

– Provides only possibility for a cold test of the final detector.– Long term availability may be limited.


Technical Contributions

• LArIAT is a good test bench to measure energy loss and related light yield.– Long term beam availability will permit detailed

measurements of performance as functions of electric field and purity.

• Provides a facility where new ideas can be tested.• If a precision LBNE calibration measurement becomes a

LArIAT goal then a contribution to the electronics development would be natural if funding is available.Electronics considerations:– Critical for LBNE design. – Could enable a more flexible design.– Would reduce project cost.


Impact LArIAT will have on LBNE detector performance uncertainties

• LArIAT Phase I will measure a precision data set which will provide the most accurate measurements of its PID capabilities and it’s efficiencies.– There is no detailed software study of the projected performance as the

reconstruction software is not sufficiently advanced.– Estimates of the projected uncertainties for the LBNE detector are not

available and will depend on software development. – Discussions with LArIAT on further studies are needed.

• Many Possibilities: LBNE plane configuration and rotated detector …

• LArIAT Phase II– Can in the short term provide a large set of fully contained hadron showers

of great value for MC development.– Is the most flexible possibility for a future precision LBNE calibration

measurement.• Cannot accommodate a full size detector cell.

– Other possibilities in the global context need to be understood.

• The possibility to develop the next generation electronics readout in cooperation with LArIAT should be explored.


Conclusions

• The LArIAT-EPAG is still assessing and documenting the possible impacts LArIAT could have on LBNE.

• The process of prioritizing the impacts needs to be done.

• We hope to have a draft report to the RDCC ready soon.

LArIAT and LBNE

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