Forward arm concepts for A-A running with the EIC detector

S. Manly

University of Rochester

EIC workshop

BNL, Sept. 19, 2002

v2 vs. and energy

Preliminary v2200

Final v2130

PHOBOS Au-Au

130 GeV result: nucl-ex/0205021, submitted to PRL

v 2

200 130

<Npart>~190

EIC detector from white paper

EIC detector from white paper

=2.1

=2.8

Coverage one wants: Phobos coverage out to roughly =5.4

EIC detector from white paper

TPC’s

Extend coilRemove lepton side endcap emcal

PID

Keep hadron side flux return the same thickness

Add si ring tracker to cover intermediate region

Offset collision point

Mods to EIC detector to optimize for AA forward region

Tracking with p determination and PID to 3.8

For coverage to higher h, put annular rings (a la PHOBOS or current white paper concept?) out to z=9m

-1.1m

1.1m2.3m

-2.3m

5.0m

-5.0m

• || < 5.5 (, 0 (

Interaction Point

PHOBOS Octagon, vertex and ring detectors

Ring counter

Change ring design to groups of three annular rings with smaller pad size so one can form three point tracklets to cut down on background