STARSTARAgreement on Spin Configuration PlanBill Christie

RHIC Coordination MeetingJanuary 24, 2006Plan:

A.) If the FPD++ installation, debugging, and commissioning has progressed sufficiently that we (STAR) believe we'll be able to start taking Physics data with the device soon after the declaration of the start of the Physics run, then:

- STAR would start the physics running with transverse (vertical) polarization. Once we've met our integrated luminosity goal, we would request the change to longitudinal polarization, and would remain with long. pol. for the remainder of the 200 GeV run.

B.) If we don't feel the FPD++ has progressed sufficiently prior to the start of the physics run, then:

- STAR will start the run with longitudinal polarization, and together with PHENIX, we'll change the polarization directions after 4 wks of the Physics run has passed. At this 4 wk junction, PHENIX would change from Radial to longitudinal polarization, which thay would maintain until the end of the 200 GeV running. STAR would change from longitudinal to vertical polarization, and would remain vertical until we'd met our transverse polarization running goal, and would then change back to longitudinal polarization for the remainder of the 200 GeV run.

A question this raises is “When in the Collider Commissioning does C-AD have to know which polarization state STAR wants to start with?” Week of Feb. 20th?

STARSTARCollider Configurations under Agreement

Option A.)

Starting Configuration:

STAR Transverse, PHENIX Radial

First reconfiguration during run (@ 4 wks):

STAR Transverse, PHENIX Longitudinal

Second reconfiguration during run (STAR meets Trans. Goal (5 pb-1 sampled) :

STAR Longitudinal, PHENIX Longitudinal

Option B.)

Starting Configuration:

STAR Longitudinal, PHENIX Radial

First reconfiguration during run (@ 4 wks):

STAR Transverse, PHENIX Longitudinal

Second reconfig. during run (STAR meets Trans. Goal (5 pb-1 sampled):

STAR Longitudinal, PHENIX Longitudinal

STARSTAR• RHIC pp performance: Luminosity

Fischer/Roser projections

11 weeks of physics

running:

STAR delivered

luminosity: 45pb-1 STAR recorded

luminosity: 15pb-1

Allowing for 5pb-1 of

transverse and 10pb-1

of longitudinal mode

running