U.S. LArTPC Detector Activities

Scott Menary

The International Scoping Study Meeting of

Neutrino Factory and Super-beam Facility

August 21-23, 2006 @ UC Irvine

S. Menary ISS @ UC Irvine August 2006 2

Conclusions (from RAL Meeting)• The infrastructure needed to build prototype Liquid

Argon TPC’s and to examine issues associated with constructing large (10’s of ktons) LArTPC’s now exists at some non-trivial level in the U.S.

• There has been progress made in design of interior of the tank, in particular the wire planes.

• There is movement toward forming an international collaboration.

• We had a joint meeting at Yale University July 11-12 with some ICARUS people to explore areas of collaboration.

S. Menary ISS @ UC Irvine August 2006 3

Proposed NuMI LArTPC R&D Path

or maybe 50

kton

Fermilab, Michigan State, Princeton, Tufts, UCLA, Yale, York (Canada)

from our*

submission toNuSAG(Fermilab FN-0776-E)

S. Menary ISS @ UC Irvine August 2006 4

Sensitivity of LArTPC on Surface at MINOS LocationMINOS plus 1, 2, 3, 6, and 12 kt LArTPC

S. Menary ISS @ UC Irvine August 2006 5

P(nu_mu->nu_e) at 810 km

Set sin^2(2theta_13) = 0.04 and Cycle delta_CP from 0 to 360 deg

If using a narrowband beam you almostneed to know delta_CP beforehand- Wideband beam is better

S. Menary ISS @ UC Irvine August 2006 6

Can We Observe both the First and Second Maxima with the NuMI Off-axis Beam?

Oscillation Probability Overlayed on Nu SpectraFrom 8 to 26 mradOff-axis of NuMI Medium Energy Beam

Here the answer is clearly NO.

S. Menary ISS @ UC Irvine August 2006 7

Same Conclusion for the Low Energy Off-axis Beam

S. Menary ISS @ UC Irvine August 2006 8

Finally, What about at 990 km From Fermilab

(Furthest Canadian Site)?

Here, 20 mrad is the minimum off-axisangle allowed (since central axis of thebeam is some 16 km above the surfaceat this point).

S. Menary ISS @ UC Irvine August 2006 9

Conclusions

• To observe both the first and second maximum in the same detector requires a wideband beam and, of course, a detector like the LArTPC that can differentiate between photons and electrons.

• Even precision studies a the first maximum need a beam broad enough to account for the variation due to delta_CP.