STAR

1

News from eRHIC

Matt Lamont,Thomas Ullrich,

William Foreman,Anders Kirleis,

Michael Savastio,Peter Schnatz

Elke Aschenauerand the CAD-eRHIC Team

E.C. Aschenauer

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

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.

4

IR-Design for MeRHIC IP-2

E.C. Aschenauer

no synchrotron shielding included allows p and heavy ion decay product tagging IP-2 height beam-pipe floor 5’-8” (with digging ~10’)

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Zeus @ HERA I

E.C. Aschenauer

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Zeus @ HERA II

E.C. Aschenauer

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Hera I vs Hera II

E.C. Aschenauer

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The Alan Caldwell detector

E.C. Aschenauer

e

p

HadronicCalorimeter

EM CalorimeterSi tracking stations

Compact – fits in dipole magnet with inner radius of 80 cm.Long - |z|5 m

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The Alan Caldwell detector

E.C. Aschenauer

2x14 Si tracking stations

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First ideas for a detector concept

E.C. Aschenauer

/ TRD

Dipol3Tm

Dipol3Tm

Solenoid (4T)

ZDC

FPDFED

// //

r: 5 ft / 1.5m

~15m

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Drift Chambers central trackingala BaBar

E.C. Aschenauer

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ToDo listoptimize magnetic fields

do we need 4T for solenoid and 3Tm for dipole what radiation length can we tolerate low Q2

optimize distance Dipole to Solenoidimpact of beam lines through the detector on physicsneed to optimize acceptance at low scattering angle

need acceptance down to 1o

finalize code to write root-trees

E.C. Aschenauer

Start immediately at 12o’clock

12:00 experimental area