EIC-Convener Meeting, AUG. 2009
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News from eRHIC
Matt Lamont,Thomas Ullrich,
William Foreman,Anders Kirleis,
Michael Savastio,Elke Aschenauer
and the CAD-eRHIC Team
E.C. Aschenauer
EIC-Convener Meeting, AUG. 2009 2
eRHIC group in Physics
E.C. Aschenauer
eRHIC taskforce formedweekly meetings on EVO Thursday@2pmconcentrate on simulating “golden physics channels” and to develop tools/software to be used by collaborationdetector – IR design together with CAD
In process of hiring 2 PostDocsHave 3 students over the summerInformation available openly for everybody at
http://www.eic.bnl.gov/https://wiki.bnl.gov/eic/index.php/Main_Page
Summer Workgenerate tools to simulate have rapgap & pythia root-trees
work to provide dvcs, pepsi and Hermes-transversity generators
simulated dis & diffractive events for several energy settings design a detector in Geant fitting in IP-2
(software based on STAR & ATLAS)generate tools to MC Geant root-treesand a lot of more
EIC-Convener Meeting, AUG. 2009 3
Momentum vs. Theta of Scat. Electron
What we see: Differences
between DIS and diffractive events
Different angle & momentum distributions depending on electron + proton energies
Momentum (GeV/c)
Thet
a (d
egre
es)
4+250 GeVDIS
4+250 GeVDiffractive
10+100 GeVDIS
10+100 GeVDiffractive
60o -
180o
140o
- 1
80o
What we do: Edit codes so only
information for certain particles are plotted, both in DIS and diffractive
E.C. Aschenauer
All done by William Foreman
EIC-Convener Meeting, AUG. 2009 4
π+ Momentum vs. Angle
What we see: Angles at which
pions are projected for different energies in both DIS and diffractive events
In DIS events, pions tend to be sent at much smaller angles compared to diffractive events
Thet
a (d
egre
es)
0o -
180
o0o
- 1
80o
Momentum (GeV/c)
4+250 GeVDIS
4+250 GeVDiffractive
10+100 GeVDiffractive
10+100 GeVDIS
We use this information to
design the detector!
E.C. Aschenauer
EIC-Convener Meeting, AUG. 2009 E.C. Aschenauer
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STAR
PHENIX
2 x 200 m SRF linac4 (5) GeV per pass5 (4) passes
Polarized e-gun
Beamdump
4 to 5 vertically separatedrecirculating passes
Cohe
rent
e-
cool
er
5 mm
5 mm
5 mm
5 mm
20 GeV e-beam16 GeV e-beam
12 GeV e-beam
8 GeV e-beam
Com
mon
vac
uum
ch
ambe
r
Gap 5 mm total0.3 T for 30 GeV
eRHICdetector
MeRHIC
detector
10-20 GeV e x 325 GeV p 130 GeV/u Au
possibility of 30 GeV @low current operation
ERL-based eRHIC Design
EIC-Convener Meeting, AUG. 2009
Medium Energy eRHIC Concept
E.C. Aschenauer
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Geometrical constraints: If it is possible use the existing interaction region at RHIC 2 o’clock and wider tunnel to place the superconducting linac inside it. Minimize civil construction cost and re-use for eRHIC already built and installed linac.
EIC-Convener Meeting, AUG. 2009 7
IR-Design for MeRHIC I
E.C. Aschenauer
no synchrotron shielding included
EIC-Convener Meeting, AUG. 2009 8
Detection from hadron beam fragments
Tagging from Au fragments and p in ep suppress incoherent scattering / ensure exclusivity
neutrons are detected in ZDC protons use magnetic rigidity Au:p 2.5:1
DX magnets disturbs p tagging
E.C. Aschenauer
EIC-Convener Meeting, AUG. 2009 9
IR-Design for MeRHIC II
E.C. Aschenauer
no synchrotron shielding included allows p and heavy ion decay product tagging
EIC-Convener Meeting, AUG. 2009 10
First ideas for a detector concept
E.C. Aschenauer
/ TRD
Dipol3Tm
Dipol3Tm
Solenoid (4T)
ZDC
FPDFED
// //
r: 5 ft / 1.5m
~15m
EIC-Convener Meeting, AUG. 2009 11
The (M)eRHIC Detetor
E.C. Aschenauer
All the work was done by Anders Kirleis with a lot of help byPavel Nevski
Still need to model EMCal in barrel and include the already modeled DIRC
EIC-Convener Meeting, AUG. 2009 12
Solenoid Magnetic Field in Z Dimension
Magnetic Field (KG)
Radial Dimension (cm)
Z Dimension (cm)
E.C. Aschenauer
EIC-Convener Meeting, AUG. 2009 13
Radial Dimension (cm)
Z Dimension (cm)
Solenoid Magnetic Field in Z Dimension
E.C. Aschenauer
EIC-Convener Meeting, AUG. 2009 14
Magnetic Field (KG)
Dipole Magnetic Field in Y Dimension
Z Dimension (cm)
Radial Dimension (cm)
E.C. Aschenauer
EIC-Convener Meeting, AUG. 2009 15
Dipole Magnetic Field in Y Dimension
Z Dimension (cm)
Radial Dimension (cm)
E.C. Aschenauer
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HITS DATA FROM A MYLAR TRACKING DETECTOR
E.C. Aschenauer
EIC-Convener Meeting, AUG. 2009 31
The √s vs. luminosity landscape
E.C. Aschenauer
semi-inclusive DIS
inclusive DIS
Diffraction
electro-weak
4x10010x100 20x100 20x250
exclusive DIS (DVCS)
exclusive DIS (PS & VM)
EIC-Convener Meeting, AUG. 2009 32
Existing Experiment LuminositiesHera :
H1 and Zeus: 1031cm-2s-127GeV e+/e- 920GeV p √s = 320GeV did measure:
inclusive & semi-inclusive DISexclusive reactions (DVCS)diffractive physicselectro-weak
Hermes:fixed target 27GeV e+/e- √s=7.2GeVpolarised: 5x1031cm-2s-1; unpol: 1032-33cm-2s-1;did measure:
inclusive & semi-inclusive DISexclusive reactions (DVCS, pS, VM)spin physics
E.C. Aschenauer
EIC-Convener Meeting, AUG. 2009 33
Existing Experiment LuminositiesCERN
Compassfixed target 160GeV m+/m- √s=17GeVpolarised: ~1031cm-2s-1; unpol: 1032-33cm-2s-1;did measure:
inclusive & semi-inclusive DISexclusive reactions (VM)spin physics
plan to measure:exclusive reactions (DVCS, PS)Drell Yan
SMC, NMC and EMC very similar, with different beam energies
E.C. Aschenauer