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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