november 18, 2008 john haggerty 1 phenix in run 9 john haggerty brookhaven national laboratory
TRANSCRIPT
November 18, 2008 John Haggerty 1
PHENIX In Run 9
John Haggerty
Brookhaven National Laboratory
November 18, 2008 John Haggerty 2
Run 9 assumptions
PAC recommendation: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.
November 18, 2008 John Haggerty 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
November 18, 2008 John Haggerty 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 W’s in central arm– ~500 W+ and ~90 W-
– First look at AL and cross section
November 18, 2008 John Haggerty 5
Central arm W
Central arms W+e+ ~21 pbW-e- ~3 pb
• Modify EMCAL gain • Develop analysis• Cross section measurement• First look at AL
November 18, 2008 John Haggerty 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
November 18, 2008 John Haggerty 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
November 18, 2008 John Haggerty 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
November 18, 2008 John Haggerty 9
Muon trigger upgrade
Major installation effortunder way… will completeNorth arm MuTr FEE upgrade in this shutdown
3 components• MuTr electronics• RPC layers• Trigger logic
RPC3
RPC1
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RPC prototype
• Resistive Plate Chambers– Fast response– Good spatial resolution– Low cost, CMS experience
• Installing prototype sector and electronics
• Engineering run
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Muon trigger board
VMEInterface
P1
P0
P2
P3
12 x xcvr
Virtex-5LX110T
(RPC1,3 @ 2.8Gbit)
(MuTr St2 @ 2.8Gbit)
(MuTr St1 @ 2.8Gbit)
(MuTr St3 @ 2.8Gbit)
One board processes four trigger octants (one octant per tile)Testing of prototype late in the run
Virtex-5LX110T
(9 fibers per octant)
Virtex-5LX110T
Virtex-5LX110T
Virtex-5LX110T
12 x xcvr
12 x xcvr
12 x xcvr
November 18, 2008 John Haggerty 12
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
November 18, 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)
November 18, 2008 John Haggerty 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
November 18, 2008 John Haggerty 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)