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, 1 October 5 th - 7 th 2016

Prologue The Electron-Ion Collider Project JLEIC Collabora,on Mee,ng Fall 2016, 2 October 6th 2016

The glue that binds us all EIC: The Next QCD Frontier Eur.Phys.J. A52 (2016) no.9, 268 JLEIC Collabora,on Mee,ng Fall 2016, 3 October 6th 2016

Electron-Proton Scattering Ability to change Q 2 changes the resolu,on scale Q 2 = 400 GeV 2 => 1/Q = 0.01 fm (Q 2 ) Ability to change x projects out different con- figura,ons where different dynamics dominate JLEIC Collabora,on Mee,ng Fall 2016, 4 October 6th 2016

Parton distribution functions (PDF) cross-section measurements decomposed structure functions Remove process factor 20 dependent QCD analysis using QCD factorization theorem PDFs universal JLEIC Collabora,on Mee,ng Fall 2016, 5 October 6th 2016

EIC: ideal facility for studying QCD Various beam energy: include non-perturba,ve, perturba,ve, and transi,on regimes broad Q 2 range for • studying evolution to Q 2 of ~1000 GeV 2 • disentangling non- perturbative and overlap with exis,ng m easurements perturbative regimes • overlap with existing experiments High luminosity: high precision • for various measurements • in various configurations JLEIC Collabora,on Mee,ng Fall 2016, 6 October 6th 2016

EIC: ideal facility for studying QCD 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, 3 He): • 3D imaging in space and momentum • spin-orbit correlations JLEIC Collabora,on Mee,ng Fall 2016, 7 October 6th 2016

Section Detector Design – General design considerations JLEIC Collabora,on Mee,ng Fall 2016, 8 October 6th 2016

DIS and final-state particles 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 . Electron beamline E electron JLEIC Collabora,on Mee,ng Fall 2016, 9 October 6th 2016

E ion and E ion /E electron EIC needs to detect all Sca`ered electron three types of par,cles Sca`ered electron E ion Par,cles Associated with Ini,al Ion Par,cles associated with struck parton E electron These become more forward boosted and harder to measure electron with increasing E ion and E ion /E electron Complicated dependence on beam energies, detector capability and physics goals. Par,cles Associated with Ini,al Ion This op,miza,on is on-going: E ion <≈100 GeV and E ion /E electron <≈10, current status à drives JLEIC baseline JLEIC Collabora,on Mee,ng Fall 2016, 10 October 6th 2016

Final-state particles The aim is to get ~100% acceptance Sca`ered electron for all final state par,cles, and measure them with good resolu,on. E ion Beam Elements E electron Central Detector electron Beam Elements Experimental challenges: • beam elements limit forward Par,cles Associated with Ini,al Ion acceptance • central Solenoid not effec,ve for forward JLEIC Collabora,on Mee,ng Fall 2016, 11 October 6th 2016

Interaction region concept NOT TO SCALE! Beam crossing angle creates Solenoid room for forward dipoles Electron beamline Dipole (1 of 4) 50 mr Dipole (1 of 3) Dipoles analyze the forward par,cles and create space for detectors in the forward direc,on JLEIC Collabora,on Mee,ng Fall 2016, 12 October 6th 2016

Interaction region concept Possible to get ~100% acceptance for the whole event Total acceptance detector (and IR) JLEIC Collabora,on Mee,ng Fall 2016, 13 October 6th 2016

Detector and interaction region Central Detector detector view p e low-Q 2 electron detection Forward hadron spectrometer and Compton polarimeter ZDC Extended detector: 80m 30m for multi-purpose chicane, 10m for central detector, 40m for the forward hadron spectrometer fully integrated with accelerator lattice accelerator view JLEIC Collabora,on Mee,ng Fall 2016, 14 October 6th 2016

Section Central Detector JLEIC Collabora,on Mee,ng Fall 2016, 15 October 6th 2016

Basic kinematic reconstruction Q 2 à Measure of resolution y à Measure of inelasticity x à Measure of momentum fraction E’ e of the struck quark in a proton Q 2 = S x y θ e θ jet E’ e, θ e , E jet , θ jet : any two of these, in What are the detector principle, sufficient to requirements? E jet reconstruct x and Q 2 . JLEIC Collabora,on Mee,ng Fall 2016, 16 October 6th 2016

Electron isoline plot JLEIC Collabora,on Mee,ng Fall 2016, 17 October 6th 2016

Quark (jet) isoline plot JLEIC Collabora,on Mee,ng Fall 2016, 18 October 6th 2016

Particle distribution E-endcap Barrel H-endcap >50 GeV <8GeV 8-50GeV E'e Ejet 20-100GeV <10GeV ~10-50GeV E,hadrons <10GeV <15GeV ~15-50GeV occupancy low medium high JLEIC Collabora,on Mee,ng Fall 2016, 19 October 6th 2016

Central detector overview Flux-return Flux- coils Flux return yoke return Hcal (muon chambers?) coils Modular Emcal (Shaslyk) aerogel mirrors s r o RICH solenoid coil (1.5 - 3 T) s n e PWO 4 s EMcal (Sci-Fi) EMcal e Endcap GEM tracker aerogel gas DIRC & TOF EMcal ( PWO 4 ) e/ π Cherenkov (HBD with rTPC?) TOF Vertex (Si pixel) Hcal GEM trackers Central tracker Dual- Dipole (low-mass DC) radiator Space for additional with field p / A muon chambers RICH exclusion EMcal for e-beam (Shashlyk) Endcap GEM trackers (top view) 5 m 2 m 3.2 m electron endcap central barrel hadron endcap JLEIC Collabora,on Mee,ng Fall 2016, 20 October 6th 2016

Generic EIC detector R&D program Outer EM cal Electron endcap eRD1 – PWO 4 small- angle EMcal eRD14 – eRD3 & eRD6 – eRD14 – DIRC MRPC TOF eRD6 – HBD/TPC? GEM trackers eRD14 – eRD14 – modular R&D program managed by Thomas Ulrich photosensors aerogel 17 proposals, interna,onal par,cipa,on RICH eRD14 – dual- JLab detector implements many of the projects radiator RICH JLEIC Collabora,on Mee,ng Fall 2016, 21 October 6th 2016

EIC User Group 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 . 22 JLEIC Collabora,on Mee,ng Fall 2016, October 6th 2016

Section Detectors in electron-beam direction JLEIC Collabora,on Mee,ng Fall 2016, 23 October 6th 2016

Chicane for electron-forward detection Extended detector: 80+ m JLEIC Collabora,on Mee,ng Fall 2016, 24 October 6th 2016

Luminosity measurement Use Bethe-Heitler process to monitor luminosity (same as HERA) JLEIC Collabora,on Mee,ng Fall 2016, 25 October 6th 2016

Low-Q 2 tagger JLEIC Collabora,on Mee,ng Fall 2016, 26 October 6th 2016

Polarization measurement Note the off-momentum electrons from IP does not enter the luminosity Compton tracker . JLEIC Collabora,on Mee,ng Fall 2016, 27 October 6th 2016

Compton polarimetry Exis,ng Polarimeter in Hall C at JLab: Achieved 0.6% Precision JLEIC Collabora,on Mee,ng Fall 2016, 28 October 6th 2016

Section Detectors in ion-beam direction JLEIC Collabora,on Mee,ng Fall 2016, 29 October 6th 2016

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 2 nd focus on Roman pots moving detectors closer to the beam JLEIC Collabora,on Mee,ng Fall 2016, 30 October 6th 2016

Far-forward ion detection Forward detection requirements: • good acceptance for recoils nucleons (rigidity close to beam) • good acceptance for fragments (rigidity different than beam) JLEIC Collabora,on Mee,ng Fall 2016, 31 October 6th 2016

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 X L = E p ’/E p , and P t (or t) (equiv. to measuring M x ) JLEIC Collabora,on Mee,ng Fall 2016, 32 October 6th 2016

Acceptance for p’ in DDIS JLEIC ZEUS Leading Proton Spectrometer Region 1 Region 2 (Hi. Res) Zhiwen Zhao Acceptance in diffractive peak (X L >~.98) ZEUS: ~2% JLEIC: ~100% JLEIC Collabora,on Mee,ng Fall 2016, 33 October 6th 2016

Epilogue Concluding remarks JLEIC Collabora,on Mee,ng Fall 2016, 34 October 6th 2016