A RICH-like cosmic rays setup

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The RICH prototype

• The RICH prototype was used in 2007 and 2009 test beams in TCC8

• 2 NIM papers out of them, -p m separation demonstrated

• RICH prototype vessel reused in NA62• What about all the rest (PM flanges, Mirror,

mirror support, electronics, etc.)?

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Cosmic rays setup

• Try to recycle part of the RICH prototype for a didactic cosmic rays setup

• Neon as radiator not practical for cosmics• Use aerogel bricks as radiator• Not a RICH but a proximity focusing Cherenkov

detector• Re-use the spherical mirror in “flat mode”

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Cosmics rays setup

m

mirror

air

Winston Cones diskPM disk

Aerogel

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40 c

m

“vessel” light tight,not gas tight

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Preparation

Align motor

Closing flange

Winston Cones

PM disk

Mirror cradle

Electronics

Cosmic chariot7/09/2011

Side walls to be done

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Aerogel

• Matsushita SP-30 (courtesy of Clara Matteuzzi from LHCb), not hydrophobic

• 3 bricks of 12x12x1 cm3 each• n=1.03 (qmax = 250 mrad, pm(thesh)=430 MeV/c)• Dist aerogel-mirror 40 cm• Rring = 2x40x0.250 = 20 cm (as in test beam)• Nhit 8-10 per cosmic event

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Didactical strategy

• Align the mirror• Trigger with a couple of scintillator• Reconstruct cosmic rays induced Cherenkov ring• …..

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Conclusions

• Attempt to reuse part of the RICH prototype• Minimal work needed (most of pieces,

electronics, DAQ) already available• Useful Lab exercise for students• PMs only temporarily available (400 used):

later to be installed in the NA62 RICH

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