ALCPG presentation

How to get by without LIQUID ARGONRajendran Raja & William Wester Fermilab, Apr,2012Assume that Liquid Argon at 5 kiloton is a given.How do we expand beyond this? This 10-15 mins minute talk, explains a possible way.Lots of R&D is needed to make this a reality (or not).

April 2012LBNE presentation1

April 2012LBNE presentation2 beam

Fermilab FN 0812 E, R.Raja, 2007

Equipotential linesApril 2012LBNE presentation3

Picture taken from Toward a Muon collider detector with manageable backgrounds 0.4 cm iron+ silicon readout. 100 GeV Singleelectron track for 4 layers= 1 radiation length.April 2012LBNE presentation4

Jimmy Walker idea of float glass.April 2012LBNE presentation5Liquid ArgonPlatesCryostat+cryo $24.6MillionConcrete/float glassLiquid Argon $9.7MillionPrice much lower. Being investigatedRad Length 14.0 cmConcrete 11.55 cmfloat glass 12.63 cmDrift Velocity 0.15cm/ms5.6cm/msDensity 1.4 g/cc2.3 gm/ccResistivity10 10 to 10 14 m

TPC with glassEach plate can be 3.5meters x 3.5 meters height x width.Each TPC plate can be 3 cm long. 4 plates will be 1 radiation length. 1 cm long drift volume. Density 1.7 gm/ccYou can think of 1.5 cm long TPC plates and 0.5 cm drift volume. Then the number of plates will be 8 for 1 radiation length. Density the same.You may need a magnetic field parallel to the drift which can be thought of as a good thing or a bad thingif a bad thing, one can conceive of a drift in alternate directions one way and then the other so that every other plate drifts one way. This means that the biases due to drift distance vs distance in x can be overcome.Both the proton decay modes (e p0 as well as m Ks ) can be visible though not as well as liquid argon.Supernovae can be seen since the earth rotates, though not as well as liquid argon.Readout using TGEM (thick gems) looks attractive.

April 2012LBNE presentation6