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1 News from eRHIC Matt Lamont, Thomas Ullrich, William Foreman, Anders Kirleis, Michael Savastio, Elke Aschenauer and the CAD-eRHIC Team E.C. AschenauerEIC-Convener Meeting, AUG. 2009
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eRHIC group in Physics E.C. Aschenauer EIC-Convener Meeting, AUG. 20092 eRHIC taskforce formed weekly meetings on EVO Thursday@2pm concentrate on simulating “golden physics channels” and to develop tools/software to be used by collaboration detector – IR design together with CAD In process of hiring 2 PostDocs Have 3 students over the summer Information available openly for everybody at http://www.eic.bnl.gov/ https://wiki.bnl.gov/eic/index.php/Main_Page Summer Work generate tools to simulate have rapgap & pythia root-trees work to provide dvcs, pepsi and Hermes-transversity generators simulated dis & diffractive events for several energy settings design a detector in Geant fitting in IP-2 design a detector in Geant fitting in IP-2 (software based on STAR & ATLAS) generate tools to MC Geant root-trees and a lot of more
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Momentum vs. Theta of Scat. Electron What we see: Differences between DIS and diffractive events Different angle & momentum distributions depending on electron + proton energies Momentum (GeV/c) Theta (degrees) 4+250 GeV DIS Diffractive 10+100 GeV DIS Diffractive 60 o - 180 o 140 o - 180 o What we do: Edit codes so only information for certain particles are plotted, both in DIS and diffractive E.C. Aschenauer 3EIC-Convener Meeting, AUG. 2009 All done by William Foreman
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π+ Momentum vs. Angle What we see: Angles at which pions are projected for different energies in both DIS and diffractive events In DIS events, pions tend to be sent at much smaller angles compared to diffractive events Theta (degrees) 0 o - 180 o Momentum (GeV/c) 4+250 GeV DIS Diffractive 10+100 GeV Diffractive DIS We use this information to design the detector! E.C. Aschenauer 4EIC-Convener Meeting, AUG. 2009
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E.C. Aschenauer EIC-Convener Meeting, AUG. 20095 STAR PHENIX 2 x 200 m SRF linac 4 (5) GeV per pass 5 (4) passes Polarizede-gun Beamdump 4 to 5 vertically separated recirculating passes Coherente-cooler 5 mm 20 GeV e-beam 16 GeV e-beam 12 GeV e-beam 8 GeV e-beam Common vacuum chamber Gap 5 mm total 0.3 T for 30 GeV eRHICdetector MeRHICdetector 10-20 GeV e x 325 GeV p 130 GeV/u Au possibility of 30 GeV @ low current operation ERL-based eRHIC Design
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Medium Energy eRHIC Concept Medium Energy eRHIC Concept E.C. Aschenauer EIC-Convener Meeting, AUG. 2009 6 Geometrical constraints: If it is possible use the existing interaction region at RHIC 2 o’clock and wider tunnel to place the superconducting linac inside it. Minimize civil construction cost and re-use for eRHIC already built and installed linac.
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IR-Design for MeRHIC I E.C. Aschenauer EIC-Convener Meeting, AUG. 20097 no synchrotron shielding included
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Detection from hadron beam fragments Tagging from Au fragments and p in ep suppress incoherent scattering / ensure exclusivity suppress incoherent scattering / ensure exclusivity neutrons are detected in ZDC neutrons are detected in ZDC protons use magnetic rigidity Au:p 2.5:1 protons use magnetic rigidity Au:p 2.5:1 DX magnets disturbs p tagging E.C. Aschenauer EIC-Convener Meeting, AUG. 20098
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IR-Design for MeRHIC II E.C. Aschenauer EIC-Convener Meeting, AUG. 20099 no synchrotron shielding included allows p and heavy ion decay product tagging
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First ideas for a detector concept E.C. Aschenauer EIC-Convener Meeting, AUG. 200910 / TRD Dipol3TmDipol3Tm Solenoid (4T) ZDC FPD FED //// r: 5 ft / 1.5m ~15m
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The (M)eRHIC Detetor E.C. Aschenauer EIC-Convener Meeting, AUG. 200911 All the work was done by Anders Kirleis with a lot of help by Pavel Nevski Still need to model EMCal in barrel and include the already modeled DIRC
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Solenoid Magnetic Field in Z Dimension Magnetic Field (KG) Radial Dimension (cm) Z Dimension (cm) E.C. Aschenauer EIC-Convener Meeting, AUG. 200912
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Radial Dimension (cm) Z Dimension (cm) Solenoid Magnetic Field in Z Dimension E.C. Aschenauer EIC-Convener Meeting, AUG. 200913
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Magnetic Field (KG) Dipole Magnetic Field in Y Dimension Z Dimension (cm) Radial Dimension (cm) E.C. Aschenauer EIC-Convener Meeting, AUG. 200914
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Dipole Magnetic Field in Y Dimension Z Dimension (cm) Radial Dimension (cm) E.C. Aschenauer EIC-Convener Meeting, AUG. 200915
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E.C. Aschenauer 22EIC-Convener Meeting, AUG. 2009
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HITS DATA FROM A MYLAR TRACKING DETECTOR E.C. Aschenauer EIC-Convener Meeting, AUG. 200930
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The √s vs. luminosity landscape E.C. Aschenauer EIC-Convener Meeting, AUG. 200931 semi-inclusive DIS inclusive DIS Diffraction electro-weak 4x100 10x100 20x100 20x250 exclusive DIS (DVCS) exclusive DIS (PS & VM)
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Existing Experiment Luminosities Hera : H1 and Zeus: 10 31 cm-2s-1 27GeV e+/e- 920GeV p √s = 320GeV did measure: did measure: inclusive & semi-inclusive DIS exclusive reactions (DVCS) diffractive physics electro-weakHermes: fixed target 27GeV e+/e- √s=7.2GeV polarised: 5x10 31 cm -2 s -1 ; unpol: 10 32-33 cm -2 s -1 ; did measure: inclusive & semi-inclusive DIS exclusive reactions (DVCS, pS, VM) spin physics E.C. Aschenauer EIC-Convener Meeting, AUG. 200932
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Existing Experiment Luminosities CERNCompass fixed target 160GeV m+/m- √s=17GeV polarised: ~10 31 cm -2 s -1 ; unpol: 10 32-33 cm -2 s -1 ; did measure: inclusive & semi-inclusive DIS exclusive reactions (VM) spin physics plan to measure: exclusive reactions (DVCS, PS) Drell Yan SMC, NMC and EMC very similar, with different beam energies E.C. Aschenauer EIC-Convener Meeting, AUG. 200933
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