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Plausability scenario

Plausability scenario. Richard Seto “forward calorimeter” meeting 8/21/2008. Design Ideas. 2-4 x/y strip layers – to get the π 0 many need 4 to give more random chances for conversion Pads in front – to keep resolution 2 EM segments+ γ / π 0 segment Physics drivers Heavy Ion

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Plausability scenario

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  1. Plausability scenario Richard Seto “forward calorimeter” meeting 8/21/2008

  2. Design Ideas • 2-4 x/y strip layers – to get the π0 • many need 4 to give more random chances for conversion • Pads in front – to keep resolution • 2 EM segments+γ/π0 segment • Physics drivers • Heavy Ion • jet-particle correlations (e.g. jet+γ, π0 +gamma, jet+ π0…) • χC • dAu • direct γ (ondrej is working on REAL data for this) • direct γ +jet • Spin • Delta G (direct γ, jet- γ, π0/ π0) • transverse physics (π0/ π0)

  3. definitions segments= γ/π0 EM1 EM1 tower tower tower tower

  4. staging plan • NCC • One side • EM1+EM2 – cost ~$2M (BNL) (2012) • γ/π0 – cost $1-2M (Yonsei/RIKEN) (2013) • 2nd side • $2-3M (Yonsei/RIKEN/+??) (2014?) • unsure about 2ndγ/π0 • RBUP • 2009 – 500 GeV pp • 2010 – 200 GeV pp+200 GeV AuAu • 2011 –AuAu low energy/pp 500 • 2012 UU 200, pp 200 • 2013 pp 500, AuAu (?) • 2014

  5. Plausibility scenario

  6. y-strip pad x-strip W Silicon detectors 1mm Scintillator Si+readout +support (2.5mm ea) 2 thickness of W (mm) 2 2 ½ ½ ½ ½ 2 1 1 1 1 ½ ½ ½ ½ Design

  7. GEANT4 design Light yield effect on resolution one track vs two track (photon/pi0) separation. Simple reconstruction chisq fit of straight track position/angular resolution 50 GeV pi0 4-x, 2x + vertex last is overlapping X-view Y-view 3-y, 2y last is overlapping

  8. Plans • I think that the physics demands the γ/π0strips for everything but the dAu the problem is that dAu is not running for several years. What will run is pp, and AuAu and low energy stuff • AuAu- we have to do some physics - not just trigger • for pp, we need to get to low-x for ΔG • we can measure ΔG using photons, or π0's (or two π0's). We want to go to energies of the π0 or photons of about 25 GeV • how do we pay for it? • the calorimeter part (no γ/π0) - cost ~$2M - get this from BNL • the γ/π0 part which we need for ΔG - get from RIKEN (in perhaps 2011)- I hope this can be done for ~$2M • perhaps for now, we only build one side • This full device, I think can be defended and can get approved. • FULL simulations are now demanded by both BNL and RIKEN • that being said, I don't see why we can’t stage it. • we build, for $2M the calorimeter (no γ/π0) - as much as we can • We can do • peripheral Au (low energy π0, chic) • pp – chic • pp – W • dAu - lots of stuff • but VERY SOON AFTER (perhaps at the same time) we get the γ/π0 part in • perhaps we build both sides of the calorimeter part, and only equip one side with γ/π0 for now) This allows • photon-jet for pp - using both calorimeters, and the γ/π0 on one side • di- π0 for pp • n AuAu we get direct photons on one side • in dAu - we get the d going and the Au going sides - (lower energy π0's) • Target date: both calorimeter and γ/π02012 run.

  9. schedule • Nov DC meeting – Final design ready • Early Feb – test beam at FNAL • test strips • test pads • test scint? wait to hear from Edouard • If test beam is successful think about putting test module into PHENIX during run • Put together a proposal by April/June • Spin • Delta G • W • Transverse physics • Heavy Ions • gamma-jet • chic

  10. Other • slides • RKS (w/barbara) putting together general slides • Contacts • Visit Calice collaboration- contact with • Japanese (APD, SiPM) • Russians/HERA • French • Manchester/London • Italians • Talks • Mickey – RSC • Ken - Spin

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