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VIBRANT DETECTOR R&D PROGRAM Calorimetry
W-Scintillator & W-Si compact and high resolution
Crystal calorimeters PbW & BGOBNL, Indiana University, Penn State Univ., UCLA, USTC, TAMU Pre-Shower
W-Si LYSO pixel array with readout via X-Y WLS fibersUniv. Tecnica Valparaiso
“Cartesian PreShower”
PID via Cerenkov DIRC and timing info Catholic Univ. of America, Old Dominion, South Carolina, JLab, GSI RICH based on GEM readout e-PID: GEM based TRD eSTAR
BNL, Indiana Univ., USTC, VECC, ANL TrackingBNL, Florida Inst. Of Technology, Iowa State, LBNL, MIT, Stony Brook, Temple, Jlab, Virginia, Yale
m-Vertex: central and forward based on MAPS Central: TPC/HBD provides low mass, good momentum, dE/dx, eID Fast Layer: m-Megas or PImMS Forward: Planar GEM detectors
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WHAT NEEDS TO BE COVERED BY THE DETECTOR
e’
t
(Q2)egL*
x+ξ x-ξ
H, H, E, E (x,ξ,t)
~~
, ,g p J/Y
p p’
Inclusive Reactions in ep/eA: Physics: Structure Fcts.: F2, FL
Very good electron id find scattered lepton Momentum/energy and angular resolution of e’ critical scattered lepton kinematics
Semi-inclusive Reactions in ep/eA: Physics: TMDs, Helicity PDFs flavor separation, dihadron-corr.,… Kaon asymmetries, cross sections Excellent particle ID: p±,K±,p± separation over a wide range in h full F-coverage around g* Excellent vertex resolution Charm, Bottom identification
Exclusive Reactions in ep/eA: Physics: GPDs, proton/nucleus imaging, DVCS, excl. VM/PS prod. Exclusivity large rapidity coverage rapidity gap events ↘ reconstruction of all particles in event high resolution in t Roman pots
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REQUIREMENTS FROM KINEMATICS
Scattered lepton: Ee = 5 GeV -2 < h < 1 Ee = 30 GeV -4.5 < h < -1
Produced Hadrons: increasing √s hadrons are boosted from forward rapidities > h
1 to backward < 0h -3<h<3 covers entire pt & z-region important for physics
Emerging Detector Concept:
high acceptance -5 < h < 5 central detector
good PID (p,K,p and lepton) and vertex resolution (< 5mm)
tracking and calorimeter same coverage good momentum resolution,
lepton PID
low material density minimal multiple scattering and brems-strahlung
Magnetic field extremely critical to get good tracking resolution in forward
direction
Integration of detector in IR design
very forward electron and proton/neutron detection
Roman Pots, ZDC, low e-tagger
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BNL: 1ST DETECTOR DESIGN CONCEPT
ToRoman Pots
Upstreamlow Q2
tagger
HCAL HCAL
ECAL PWO ECAL WScinECAL W-Scintillator
RICHRICH
PID:-1<h<1: DIRC or proximity focusing Aerogel-RICH1<|h|<3: RICH Lepton-ID: -3 <h< 3: e/p 1<|h|<3: in addition Hcal response & g suppression via tracking|h|>3: ECal+Hcal response & g suppression via tracking-5<h<5: Tracking (TPC+GEM+MAPS)
DIRC/proximity RICH
h-h
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eRHIC HIGH-LUMINOSITY IR WITH b*=5 CM
10 mrad crossing angle and crab-crossing High gradient (200 T/m) large aperture Nb3Sn focusing magnets Arranged free-field electron pass through the hadron triplet magnets Integration with the detector: efficient separation and registration of
low angle collision products Gentle bending of the electrons to avoid SR impact in the detector
e
p
eRHIC - Geometry high-lumi IR with β*=5 cm, l*=4.5 m and 10 mrad crossing angle
20x250
20x250
GeneratedQuad aperture limitedRP (at 20m) accepted
EXCLUSIVE REACTIONS: EVENT SELECTION
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proton/neutron tag method
o Measurement of t o Free of p-diss backgroundo Higher MX rangeo to have high acceptance for Roman Pots / ZDC challenging IR design
Diffractive peak
x L=p' zp z
≈1− x IP
Large Rapidiy Gap method
o X system and e’ measuredo Proton dissociation backgroundo High acceptance M
Y
Q2
W
How can we select events: two methods
Need for roman pot
spectrometerANDZDC
Need for Hcal in the
forward region
DVCS KINEMATICS
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leading protons are never in the main detector
acceptance at EIC (stage 1 and 2)
eRHIC detector acceptance
e’(Q2)
e gL*
x+ξ x-ξ
H, H, E, E (x,ξ,t)~~
g
p p’t
REQUIREMENTS Acceptance at large-|t| proper design of quadrupole magnets Acceptance for the whole solid angle High momentum resolution radiation hardness
5x100 GeV 5x100 GeV20x250 GeV
t-MEASUREMENT USING RP
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Accepted in“Roman Pot” at 20m
Quadrupoles
acceptance
10s from the beam-
pipe
• high‐|t| acceptance mainly limited by magnet aperture
• low‐|t| acceptance limited by beam envelop (~10σ)
• |t|‐resolution limited by– beam angular divergence ~100μrad for small |t|– uncertainties in vertex (x,y,z) and transport– ~<5-10% resolution in t (follow RP at STAR)
Simulation based on
eRHIC
GeneratedQuad aperture limitedRP (at 20m) accepted
20x250
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KINEMATICS OF BREAKUP NEUTRONS
Results from GEMINI++ for 50 GeV Au
+/-5mrad acceptance totally sufficient
Results:With an aperture of ±3 mrad we are in good shape• enough “detection” power for t > 0.025 GeV2
• below t ~ 0.02 GeV2 photon detection in very forward directionQuestion:• For some physics needed rejection power for
incoherent: ~104
Critical: ZDC efficiency
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