s/ephenix forward upgrade
DESCRIPTION
s/ePHENIX forward upgrade. Jin Huang (LANL) for the PHENIX collaboration. h. g *. e ’. q. e. PHENIX collaboration actively pursue forward upgrade Wide spectrum of forward physics considered A upgrade path that supports pp, pA , ep , eA collisions Assuming EIC start at 2025; - PowerPoint PPT PresentationTRANSCRIPT
s/ePHENIX forward upgrade
Jin Huang (LANL)for the PHENIX collaboration
Jin Huang <[email protected]> 2
PHENIX collaboration actively pursue forward upgrade Wide spectrum of forward physics considered A upgrade path that supports pp, pA, ep, eA collisions
◦ Assuming EIC start at 2025; ◦ On the path, hadron collisions benefit from upgrade starting ~2019
Workshop on Forward upgrades
qh
g*e’
e
Jin Huang <[email protected]> 3
Distribution of quarks and gluons and their spins in space and momentum inside the nucleon◦ Nucleon helicity structure ◦ Parton transverse motion in the nucleon ◦ Spatial distribution of partons and parton orbital angular momentum
QCD in nuclei◦ Nuclear modification of parton distributions◦ Gluon saturation◦ Propagation/Hadronization in nuclear matter
Outlined in EIC white paper, arXiv:1212.1701 LOI charged to both PHENIX and STAR
Workshop on Forward upgrades
EIC (Stage I) physics overview
qh
g*e’
e
EIC coverage/ world data comparison:
Helicity structure function SIDIS Sivers Asymmetries DVCS
Jin Huang <[email protected]> 4
DY SSA (AN) gives access to, among others, quark Sivers effect (f1T⊥) in proton
◦ f1T⊥ expected to reverse in sign from SIDIS to DY measurement, an important test for gauge-link
understanding of TMD◦ Testing the size of TMD evolutions◦ Probing orbital motion of partons
Require forward di-lepton detection
Workshop on Forward upgrades
p-p forward spin physics I - DY AN
One-year running projection
proton
proton μ-
μ+proton
lepton lepton
pion
Semi-inclusive DIS (SIDIS) Drell-Yan
Courtesy to M. Burkardt
Jin Huang <[email protected]> 5
p-p forward spin physics IIJet Asymmetries
Jet/photon left-right asymmetry Probes Sivers effect: parton level correlation between spin and transverse momentum Detector: require good jet reconstruction
Left-right asymmetry of identified hadron inside jets Collins fragmentation: transverse quark spin → kT of hadron Probes: quark transversity and tensor charge Detector: + PID inside the jet
Workshop on Forward upgrades
• Separating origin of AN with Jet measurements
Jin Huang <[email protected]> 6
Forward observables allows probe low-x region in nuclei
Hadron transverse spin asymmetry◦ Link between TMD and CGC framework,
relates transverse single spin asymmetry to saturation scale
◦ Allowed by unique capability of RHIC to collide polarized proton with ions and protons
Di-Jet measurement ◦ Probe both flavors of distribution for gluon at low-x limits, G(1) & G(2)
Workshop on Forward upgrades
Forward physics in p-A collisions
Kang, Yuan PRD84 (2011) 034019
Jin Huang <[email protected]> 7
With detection capability beyond Bjorken plateau: Correlation measurements
→ longitudinal expansion (3d-hydro) Direct photons
→ the expansion of the medium Extended (di-)jet coverage
→ jet energy loss in the medium Suppression measurements
→ test linear factorization Additional handle for critical point search
Workshop on Forward upgrades
Forward physics in heavy ion collisions
Jin Huang <[email protected]> 8
PHENIX has been planning upgrade programs aimed at both central and forward region◦ Central MIE sent to DOE by BNL Apr 2013
Productive series of workfests hosted to brainstorm/develop forward detector designs◦ Recent workshops: May 2013 @ Santa Fe and July 2013 @ Japan/RIKEN
Current progress◦ Converging on detector concept designs◦ Performance quantified in first order◦ Developing GEANT simulation models
ePHENIX LOI writing committee formed, planned collaboration release at end of August
Workshop on Forward upgrades
Designing the next stage forward PHENIX
e/sPHENIX forward workfest, Santa Fe, May 21-25
Jin Huang <[email protected]> 9
Use jets as a tool to investigate the constituents and dynamics of the sQGP in the region of strongest coupling through its transport coefficients
Detector package: Solenoidal field/Central silicon tracking/EMCal+Preshower/HCal
Steady progress◦ Started in 2009 with PHENIX decadal plans◦ Initial MIE submitted to BNL June 2012◦ BNL administered review Oct 2012◦ MIE sent to DOE by BNL Apr 2013
Compatible with forward designs
Workshop on Forward upgrades
Central rapidity Upgrade
arXiv:1207.6378, and updates
Jin Huang <[email protected]> 10Workshop on Forward upgrades
Forward detector design Goals and constraints
1.684 m
IP4.50 m
q=10 mrad
1.9
c m (p
o/2 .
5)
ZDCq=10 mrad
q=4 mrad
1.06m
1.0 m 1.95 m
0.845 m
neutronsIon beam
246812
1416 10
0.11
07 m
0.13
3 m
Electron quadrupoles
Combined functionmagnetQuad 3 Quad 2
3
11.0364m
5 mrad
From D. Trbojevic
e p/A
Upgrade path that supports pp/pA/AA, then ep/eA physics◦ Jets, lepton and photons over a large range in rapidity (1<η<4)◦ Hadron PID in the forward region◦ Additional backward+central electron measurement in EIC stage
Compatible with central arm upgrade Fit in the default IR for s/ePHENIX◦ IR limit in Z = 4.5m ◦ Height limit of beam-rail of 4.5 m◦ No bending magnetic field on beam
Jin Huang <[email protected]> 11
Cancelation of SuperB has made BaBar solenoid potentially available
Favor for forward tracking◦ Longer field volume (L x~2)◦ Higher current density at end of the
magnet◦ Quantified by comparison to the
default and extended sPHENIX solenoid
At ALD’s request, drafting an official letter to express interest in acquiring the magnet
Workshop on Forward upgrades
Recent development:Babar Magnet
Tracking resolution based on field calculationBabar magnet VS longer MIE sPHENIX magnet
BaBar solenoid in its transfer frame, May 17 2013
Longer Magnet
Babar
Jin Huang <[email protected]> 12Workshop on Forward upgrades
A detector concept – hadron collisions
Aerogel&
RICH
GEMStation4
EMCal
HCal
GEMStation2
z (cm)
R (cm)
HCal
η~1
η~4
η~-1
R (cm)
GEMStation3
SiliconStation1
MuID
p p3He p p A A A
Forward field shaper (later slides)
Central silicon tracking
EMCal& Preshower
Numerical field calculation from POISSION shownCrosschecked with Opera/FEM and used in analysis of later slides
Jin Huang <[email protected]> 13Workshop on Forward upgrades
A detector concept – EIC collisions
p/A e-
Aerogel&
RICH
GEMStation4
EMCal
HCal
GEMStation2
z (cm)
R (cm)
HCal
EMCal& Preshower
GEMs
EMCal & Preshower
μ-TPC
DIRC
η~1
η~4
-1.2
R (cm)
GEMStation3
GEMsStation1
η~-1
Jin Huang <[email protected]> 14
Design Family Example
Piston • Passive piston (C. L. da Silva)• Super conducting piston (Y. Goto)
Dipole • Forward dipole (Y. Goto, A. Deshpande, et. al.)• Redirect magnetic flux of solenoid (T. Hemmick)• Use less-magnetic material for a azimuthal portion of central H-Cal (E. Kistenev)
Toroid • Air core toroid (E. Kistenev)• Six fold toroid (J. Huang)
Other axial symmetric Field shaper
• Large field solenoidal extension (C. L. da Silva)• Pancake field pusher (T. Hemmick)
Workshop on Forward upgrades
Very forward tracking ideas probed: Specialized forward field considered
Beam line magnetic field shielding,based on superconducting pipe.Test device planned (Stony Brook Group)
B
Jin Huang <[email protected]> 15Workshop on Forward upgrades
One promising solution:Passive piston field shaper
BTrack
by C. L. da Silva
Jin Huang <[email protected]> 16
Advantage :◦ Significantly improved very
forward field where Babar field is least effective
◦ Simple implementation◦ Minimal interaction with
Babar field and beam Challenges that under study◦ Background shower from
piston◦ Further improvement limited
by total piston flux (may use silicon detector)
Workshop on Forward upgrades
Passive piston field shaper
With passive piston(Notice change in vertical scale)
Default Babar field
by C. L. da SilvaPiston area
Jin Huang <[email protected]> 17
Cherenkov detector for hadron ID◦ p<~10 GeV/c: aerogel radiator◦ p>~10 GeV/c: gas radiator◦ Statistical separation under study, considering
Photon fluctuation and detection error Tracking resolution Field bending (next slides)
◦ Promising hadron PID capability demonstrated EM Calorimeter
◦ Restacking of the current PHENIX calorimeter◦ σ(E)/E ~ 8%/√E
Hadronic calorimeter ◦ New iron scintillator sample calorimeter◦ Also serve as field return◦ σ(E)/E ~ 90%/√E
Other PID options under study◦ Stack of threshold Cherenkov detectors◦ High precision TOF detectors
Workshop on Forward upgrades
Forward PID consideration
Purity of hadron sample using CF4 RICHby T. Erdenejargal (U. Colorado)
• dp/p = 0.5% x p assumed • Evaluated 10x250 EIC at η=3
Purit
y
Proton not
firing RICH
−π−K−p
Stat. limit
Jin Huang <[email protected]> 18Workshop on Forward upgrades
Estimating field distortion for RICH
Track
Field calculated numerically with field return Field lines mostly parallel to tracks in the
RICH volume Field distortion of RICH ring only contribute
to a minor uncertainty
RICH
GEMStation3
EMCal
HCal
r
A RICH Ring:Photon distribution due to tracking bending only
R
DispersionΔR <2 mrad
R < 52 mrad for C4F10
Jin Huang <[email protected]> 19
Initial study of pointing resolution◦ 1<η<3: 0.01-0.03 (rad or η unit)◦ 3<η<4: ~0.05 (rad or η unit)
Workshop on Forward upgrades
Initial Jet response studywith EMCal + HCalby Mike M.
Azimuthal difference VS ETrue Azimuthal Resolution VS ETrue
Ereco VS Etrue :
1<η<2 2<η<3 3<η<4
Jin Huang <[email protected]> 20
2D Field calculation using three tools and cross check◦ Opera/FEM/POISSION
Simulation implementation in Geant4
Workshop on Forward upgrades
On going simulation work
PYTHIA 5x50 GeV e-p event in GEANT4by C. Pinkenburg
30 GeV electron track and shower in hadron endcap, by C. L. da Silva
Jin Huang <[email protected]> 21
PHENIX collaboration actively pursue forward upgrade Wide spectrum of forward physics and collision species
considered◦ For pp/pA/AA collisions : multi-dimentional hadron structure, cold
nuclear matter, critical point search and 3d-hydro◦ For EIC stage-I, ep/eA collisions:
Nucleon helicity and multi-dimentional structure, Nuclear modification, Gluon saturation, Propagation/Hadronization in nuclear matter
Upgrade path for both hadron and EIC collisions◦ Fit into geometry constraint, no field on beam line◦ Converging on detector concept and upgrade path◦ Providing a large rapidity coverage and comprehensive PID capability◦ Quantifying detector performance
Workshop on Forward upgrades
Summary