PHENIX In Run 9

1
PHENIX In Run 9

• John Haggerty
• Brookhaven National Laboratory

2
Run 9 assumptions
PAC recommendation 3. Longitudinally polarized
proton-proton collisions at vs 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.
3
Run 9 planning

• Run 9 planning is fairly far along
• Beam Use Proposal and PAC guidance
• Planning document (TN-427) 200 GeV pp
• October DC meeting parade of systems
• December physics/trigger/daq/analysis DC meeting
• Steve Pate agreed to serve as Spin Coordinator

4
Physics goals at 500 GeV

• Measure backgrounds under high pT muons
• Test muon trigger electronics (currently being
  installed)
• Measure production cross sections ?0, ? to pT
  30 GeV, J/?, ?
• Measure ALL for ?0, ?
• With 25 pb-1 record Ws in central arm
• 500 W and 90 W-
• First look at AL and cross section

5
Central arm W?

• Modify EMCAL gain
• Develop analysis
• Cross section measurement
• First look at AL

Central arms W?e? 21 pb W-?e-? 3 pb
6
Detector issues for 500 GeV running

• Magnetic field configuration
• HBD needs field free bucked central field
  (-)
• But momentum resolution in central arms is
  compromised by reduced field
• EC agreement to switch field to after first
  week of physics running
• Gain changes in EMCAL (present dynamic range set
  to 20 GeV) mostly done with laser, should be
  close at beam startup

7
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
• Absorber in muon arm
• First goal of upgrade detectors do no harm

8
HBD

• HBD.W installed
• HBD.E scheduled for installation December 16
• Will need to gain operational experience with
  DAQ, HV, monitoring, calibration, analysis
• - field configuration necessary for HBD
  operation

9
Muon trigger upgrade

• 3 components
• MuTr electronics
• RPC layers
• Trigger logic

RPC1
RPC3
Major installation effort under way will
complete North arm MuTr FEE upgrade in this
shutdown
10
RPC prototype

• Resistive Plate Chambers
• Fast response
• Good spatial resolution
• Low cost, CMS experience
• Installing prototype sector and electronics
• Engineering run

11
Muon trigger board
One board processes four trigger octants (one
octant per tile) Testing of prototype late in the
run
(RPC1,3 _at_ 2.8Gbit)
P1
VME Interface
P0
(MuTr St2 _at_ 2.8Gbit)
P2
(MuTr St1 _at_ 2.8Gbit)
(MuTr St3 _at_ 2.8Gbit)
Virtex-5 LX110T
P3
(9 fibers per octant)
12
Many other detector repairs/improvements

• 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

8 kHz
Run 6 ERT turnon
13
Operational Efficiency

• Review of operational efficiency at ST Review
  July 7-9, 2008
• Short summary (from Run 8 dAu)
• 50 in vertex cuts (no change expected)
• 77 uptime (modest improvements possible, but
  less with development)
• 89 livetime (slight improvement possible with
  higher rates)

14
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

15
RHIC/PHENIX interaction

• Magnetic field change - to shortly after
  physics run begins
• Tunnel access for RPC3 prototype during startup
• Optimizing the big three luminosity,
  polarization, background
• Improve communication with MCR (discussion with
  Lee Hammons)