October 3, 2008 John Haggerty 1

PHENIX Plan for Run 9

John Haggerty

Brookhaven National Laboratory

October 3, 2008 John Haggerty 2

PAC Recommendations, May 8-9, 2008

The PAC was asked to prioritize the physics goals listed in the Beam Use Proposals submitted by the STAR and PHENIX collaborations, on both short and intermediate time scales. In view of uncertain short-term budget prospects, the PAC decided to consider Runs 9 and 10 together (notated below as Run 9-10). We recommend the following “must do” measurements in the order of their priority:

1. Longitudinally polarized proton-proton collisions at √s = 200 GeV with 60% average polarization for 10-12 weeks, sufficient to record an integrated luminosity of about 25 pb-1 in PHENIX and about 50 pb-1 in STAR.

2. High luminosity Au+Au collisions at √s = 200 GeV for 8-10 weeks, corresponding to an integrated luminosity of 1.2-1.4 nb-1 in PHENIX, to exploit the capabilities of its Hadron Blind Detector (HBD). This will allow both a high precision measurement of the low mass di-lepton spectrum in PHENIX and STAR, and development of transverse stochastic cooling of the Au beams. In addition, it will enable STAR to exploit its new DAQ capability in a high statistics run.

3. Longitudinally polarized proton-proton collisions at √s = 500 GeV for 5 weeks to allow beam development and commissioning by C-AD, a first measurement of W boson production in PHENIX, and background studies in STAR.

October 3, 2008 John Haggerty 3

Expected run plan

According to Steve Vigdor in RHIC News (9/23/2008):

• Cryo startup Feb 1• 500 GeV Beam in one ring ~1 week later• Collisions for development ~Feb 15• Polarization, luminosity, and backgrounds adequate

for physics ~Mar 1• If ( budget ~ FY09 request ) {

– Switch to 200 GeV longitudinal ~ Apr 15

} else {– End run ~ Apr 15}

October 3, 2008 John Haggerty 4

Upgrade Detectors in Run 9

• Upgrade detectors in Run 9 are partial installations or engineering runs:– HBD– Muon Trigger (MUTR FEE upgrade)– Muon RPC prototype

• First goal of upgrade detectors: do no harm

October 3, 2008 John Haggerty 5

HBD

• HBD has had major surgery at SBU• East is now complete in glove box here at SBU• West

– A problem with the gas system on August 22 resulted in ~100’s ppm O2 and off-scale H2O

– Replace GEM’s new CsI– Schedule tight but should be ready for installation

when we need it in early November

• Will need to gain operational experience with DAQ, HV, monitoring, calibration, analysis

October 3, 2008 John Haggerty 6

Muon Trigger Upgrade

(KEK, RIKEN, Kyoto, Rikkyo)

Major installation effortunder way… completeNorth arm in this shutdown

October 3, 2008 John Haggerty 7

RPC Prototype

• Resistive Plate Chambers– Fast response– Good spatial resolution– Low cost, CMS experience

• Installing prototype sector and electronics

• Engineering run

October 3, 2008 John Haggerty 8

Trigger Board Block Diagram(John Lajoie, ISU)

VMEInterface

P1

P0

P2

P3

12 x xcvr

Virtex-5LX110T

(RPC1,2,3 @ 2.8Gbit)

(MuTr St2 @ 2.8Gbit)

(MuTr St1 @ 2.8Gbit)

(MuTr St3 @ 2.8Gbit)

One board processes four trigger octants (one octant per tile).

Virtex-5LX110T

(9 fibers per octant)

Virtex-5LX110T

Virtex-5LX110T

Virtex-5LX110T

12 x xcvr

12 x xcvr

12 x xcvr

October 3, 2008 John Haggerty 9

Many other detector repairs/improvements

Run 6 ERT turnon

8 kHz

• DAQ improvements to increase livetime, event rate

• EMCAL/RICH trigger efficiency improvements

• DC and PC repairs

• MUTR high voltage stability

• Could be some additional small tests/prototypes for upgrades

October 3, 2008 John Haggerty 10

Final days schedule

• Need to complete MuTrig installation, remove scaffolding; install HBD, RPC prototype

• Expecting closing up the shield wall beginning of January, 2009 then safety and detector checkout

October 3, 2008 John Haggerty 11

W

Central arms W+e+ ~21 pbW-e- ~3 pb(Kensuke Okada)

Muon arms W++ ~10 pb(Ralph Seidl)

October 3, 2008 John Haggerty 12

Issues for 500 GeV Running

• Magnetic field configuration– HBD needs “field free” bucked central field (“+-”) to be HB– But momentum resolution in central arms is compromised by

+- field (needs more quantitative study, but 1.7 mr compared to 2.4 mr for ++ ( ~ 0.5 mr) at 40 GeV

• Gain changes in EMCAL (present dynamic range set to 20 GeV)

• ?

October 3, 2008 John Haggerty 13

Operational Efficiency

• Review of operational efficiency at S&T Review July 7-9, 2008

• Short summary (from Run 8 d+Au):– 50% in vertex cuts (no change

expected)– 77% uptime (modest improvements

possible, but less with development)– 89% livetime (slight improvement

possible with higher rates)

34% of delivered beam to physics… probably not much different in Run 9

October 3, 2008 John Haggerty 14

Conclusion

• Thanks to Steve Pate who has agreed to serve as my Spin Coordinator

• Looks like 500 GeV longitudinal polarized pp (but equally or better prepared for 200 GeV)

• Run planning document (TN-427)• Fair number of upgrade detectors and prototypes,

none of them central to physics this year• Modest improvements can be expected in trigger,

data acquisition, and detectors