Update on JLEIC Detector Design Markus Diefenthaler - - PowerPoint PPT Presentation

Update on JLEIC Detector Design

Markus Diefenthaler (mdiefent@jlab.org) JLEIC Collabora,on Mee,ng Fall 2016, October 5th- 7th 2016

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Prologue The Electron-Ion Collider Project

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The glue that binds us all

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EIC: The Next QCD Frontier

Eur.Phys.J. A52 (2016) no.9, 268

Electron-Proton Scattering

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Ability to change x projects out different con- figura,ons where different dynamics dominate Ability to change Q2 changes the resolu,on scale

Q2 = 400 GeV2 => 1/Q = 0.01 fm

(Q2)

Parton distribution functions (PDF)

cross-section measurements structure functions PDFs

QCD analysis using QCD factorization theorem process dependent decomposed universal

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Remove factor 20

EIC: ideal facility for studying QCD

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High luminosity: high precision

• for various measurements
• in various configurations

Various beam energy: broad Q2 range for

• studying evolution to Q2 of

~1000 GeV2

• disentangling non-

perturbative and perturbative regimes

• verlap with existing

experiments

• verlap with exis,ng measurements

include non-perturba,ve, perturba,ve, and transi,on regimes

EIC: ideal facility for studying QCD

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Polariza.on Understanding hadron structure cannot be done without understanding spin:

• polarized electrons and
• polarized protons/light ions

Transverse and longitudinal polarization of light ions (p, d, 3He):

• 3D imaging in space and momentum
• spin-orbit correlations

Section Detector Design – General design considerations

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DIS and final-state particles

Electron beamline

Eelectron Aim of EIC is nucleon and nuclear structure beyond the longitudinal descrip,on. This makes the requirements for the machine and detector different from all previous colliders including HERA.

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Eion and Eion/Eelectron

Eion

electron

Sca`ered electron Par,cles Associated with Ini,al Ion

EIC needs to detect all three types of par,cles

Sca`ered electron Par,cles Associated with Ini,al Ion Par,cles associated with struck parton

These become more forward boosted and harder to measure with increasing Eion and Eion/Eelectron Complicated dependence on beam energies, detector capability and physics goals. This op,miza,on is on-going: Eion <≈100 GeV and Eion/Eelectron <≈10, current status à drives JLEIC baseline Eelectron

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Final-state particles

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Eion

electron

Sca`ered electron Par,cles Associated with Ini,al Ion

Eelectron The aim is to get ~100% acceptance for all final state par,cles, and measure them with good resolu,on. Experimental challenges:

• beam elements limit forward

acceptance

• central Solenoid not effec,ve for

forward

Central Detector

Beam Elements Beam Elements

Interaction region concept

Electron beamline 50 mr

Solenoid Dipole (1 of 3) Dipole (1 of 4)

NOT TO SCALE!

Beam crossing angle creates room for forward dipoles Dipoles analyze the forward par,cles and create space for detectors in the forward direc,on

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Interaction region concept

Possible to get ~100% acceptance for the whole event

Total acceptance detector (and IR)

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Detector and interaction region

Forward hadron spectrometer low-Q2 electron detection and Compton polarimeter

p e

ZDC

Extended detector: 80m

30m for multi-purpose chicane, 10m for central detector, 40m for the forward hadron spectrometer

fully integrated with accelerator lattice

Central Detector

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detector view accelerator view

Section Central Detector

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Basic kinematic reconstruction

E’e Ejet θe θjet Q2 à Measure of resolution y à Measure of inelasticity x à Measure of momentum fraction

• f the struck quark in a proton

Q2 = S x y

E’e,θe ,Ejet ,θjet : any two of these, in principle, sufficient to reconstruct x and Q2.

What are the detector

requirements?

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Electron isoline plot

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Quark (jet) isoline plot

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Particle distribution

E-endcap Barrel H-endcap E'e Ejet <8GeV 8-50GeV >50 GeV ~10-50GeV <10GeV <10GeV <15GeV ~15-50GeV

low medium high

20-100GeV E,hadrons

• ccupancy

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Central detector overview

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electron endcap central barrel hadron endcap Flux-return coils Flux return yoke (muon chambers?) solenoid coil (1.5 - 3 T) EMcal (Sci-Fi) aerogel Dual- radiator RICH Dipole with field exclusion for e-beam e p / A

Hcal Hcal

PWO4 EMcal GEM trackers Emcal (Shaslyk) s e n s

• r

s gas mirrors Flux- return coils (top view)

2 m

Central tracker (low-mass DC) Vertex (Si pixel) DIRC & TOF Space for additional muon chambers Endcap GEM tracker e/π Cherenkov

(HBD with rTPC?)

TOF

EMcal ( PWO4)

Modular aerogel RICH Endcap GEM trackers

EMcal (Shashlyk)

3.2 m 5 m

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Generic EIC detector R&D program

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eRD1 – PWO4 small- angle EMcal eRD14 – dual- radiator RICH eRD14 – DIRC

Outer EM cal

Electron endcap

eRD14 – MRPC TOF eRD3 & eRD6 – GEM trackers eRD6 – HBD/TPC? eRD14 – modular aerogel RICH eRD14 – photosensors

R&D program managed by Thomas Ulrich 17 proposals, interna,onal par,cipa,on JLab detector implements many of the projects

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EIC User Group

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EIC User Group (h`p://www.eicug.org) Currently 663 members from 147 ins.tu.ons from 28 countries. Nuclear Physicists around the world are thinking about and defining the EIC research program.

Section Detectors in electron-beam direction

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Chicane for electron-forward detection

Extended detector: 80+ m

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Luminosity measurement

Use Bethe-Heitler process to monitor luminosity (same as HERA)

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Low-Q2 tagger

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Polarization measurement

Note the off-momentum electrons from IP does not enter the luminosity Compton tracker.

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Compton polarimetry

Exis,ng Polarimeter in Hall C at JLab: Achieved 0.6% Precision

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Section Detectors in ion-beam direction

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Ion optics for near-beam detection

Extended detector: 80+ m

• A large dispersion at the

detection point separates scattered (off-momentum) particles from the beam.

• A second focus and small

emittance (cooling) allows moving detectors closer to the beam

2nd focus on Roman pots

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Far-forward ion detection

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Forward detection requirements:

• good acceptance for recoils nucleons (rigidity close to beam)
• good acceptance for fragments (rigidity different than beam)

An example: Diffractive DIS (DDIS)

Signature for Satura,on (among other things) Iden,fy the sca`ered proton: dis,nguish from proton dissocia,on Measure XL= Ep’/Ep, and Pt (or t) (equiv. to measuring Mx)

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Acceptance for p’ in DDIS

Acceptance in diffractive peak (XL>~.98) ZEUS: ~2% JLEIC: ~100%

JLEIC ZEUS Leading Proton Spectrometer

Zhiwen Zhao

Region 2 (Hi. Res) Region 1

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Epilogue Concluding remarks

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Complementary detector scenarios

• two detectors optimized for different capabilities and using complementary

technologies allow better performance and improved cost-effectiveness

• complementary sensitivity to physics, backgrounds and fake effects
• cross-checks on discoveries and important physics results
• combine results for precision measurements:

– a combined reduction of systematics – in a ring-ring collider: detector luminosities can be added

• higher efficiency of operation
• increase scientific productivity
• focus on single track reconstruction and PID
• ptimized to support the broad physics program in the white paper
• focus on jet reconstruction and calorimetry

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IP1: multi-purpose, full acceptance detector (this presentation) IP2: complementary, smaller detector

Towards the realization of the EIC

• Accelerator Physicists, Experimentalists,

and Theoreticians are thinking about and defining the EIC research program. It’s important that many labs and universities - not only from within the NP community - get involved.

• Close collaboration among Accelerator

Physicists, Experimentalists, and Theoreticians at Jefferson Lab.

• Concept finalized for the JLEIC

Interaction and Detector Region.

• Documentation in preparation.
• Detailed detector simulations are

required to verify the design and

• ptimize the physics reach.

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