run 15 report - brookhaven national laboratory2015/01/20 cool down to 4 k, watch shifts ready...
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Oleg Eyser
Run 15 Report
RHIC/AGS Annual Users Meeting June 9-12, 2015
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Beam use request & physics program
STAR detector & upgrades
Run 15 operation & data set Outlook
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3 Beam Use Request for Run 15
System Energy Duration Polarization Priority Sequence
๐ + ๐ด๐ด ๐ ๐๐ = 200 GeV 5 weeks Transverse โ โธ
๐ + ๐ ๐ = 200 GeV 6 weeks Transverse โก โท
6 weeks Longitudinal โก โถ
โถ double longitudinally polarized ๐ + ๐ collisions, โ = 50 pbโ1,๐ = 60%
โท single transversely polarized ๐ + ๐ collisions, โ = 40 pbโ1,๐ = 60%
โธ single transversely polarized ๐ + ๐ด๐ด collisions, โ = 300 nbโ1,๐ = 60%
โถโทโธ also unpolarized for ๐ด๐ด + ๐ด๐ด reference
Based on 22 cryo weeks for in 2015 โ 17 weeks for physics
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4 โถ Hot & Dense Medium Effects Precision measurement: ๐ ๐ด๐ด
๐ท0 mesons with tight ๐ง-vertex ๐ง๐ฃ๐ฃ๐ฃ < 5 cm
Heavy Flavor Tracker Commissioned in Run 14
Run 15:
๐ + ๐ reference ๐ = 200 GeV
Combination of minimum bias low-๐๐
triggered high-๐๐
๐ ๐ด๐ด
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5 โถ Heavy Quarkonia In-medium dissociation in thermal QCD system
Evidence of color screening and free quarks in medium
Ratio of different ฮฅ(1s)/ฮฅ(2s)/ฮฅ(3s)-states: ฮฅ โ ๐+ + ๐โ
Compare suppression ๐ด๐ด + ๐ด๐ด, ๐ + ๐ด๐ด, ๐ + ๐ of J/๐
Muon Telescope Detector Commissioned in Run 14
๐ผ yield ratios
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6 โถ Gluon Polarization in the Proton With recent RHIC data: โซ ฮ๐ ๐ฅ ๐๐ฅ = 0.2โ0.07
+0.0610.05
Improve statistics at high-๐๐ for jet measurements Low-๐๐ systematics limited
RHIC Spin white paper arxiv:1501.01220
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7 โท Universality in QCD Process dependence of spin-orbit correlations in nucleons
Sign-change in TMD Sivers function: SIDIS vs. Drell-Yan
Equivalent description in twist-3: ๐๐๐,๐น ๐ฅ, ๐ฅ = โซ๐2๐โฅ๐โฅ 2
๐๐1๐โฅ๐ ๐ฅ, ๐โฅ2
๐ + ๐ โ ๐ + ๐พ at forward rapidities (3 โฒ ๐ โฒ 4)
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8 โท Spin Dependent Fragmentation Use spin dependent fragmentation as analyzer for transversity
๐ยฑ-jet correlations (provides two scales for TMD framework)
dihadron fragmentation (collinear framework)
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9 โธ Saturation in Cold Nuclear Matter Gluon saturation signature in transverse single spin
asymmetries ๐ด๐ Color Glass Condensate calculations Phys. Rev. D84, 034019 (2011)
โ ๐ด๐ suppression depends on saturation scale ๐๐๐
Saturation is enhanced in nuclei: ๐๐๐ด = ๐ด1/3 โ ๐๐๐
๐๐๐ = 1.0 GeV
๐๐๐ = 0.8 GeV
Can we see the onset of saturation?
๏ฟฝโ๏ฟฝ + ๐
๏ฟฝโ๏ฟฝ + ๐ด๐ด
๏ฟฝโ๏ฟฝ + ๐ด๐ด
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10 โถ Diffractive Processes Pomeron exchange
color singlet combination of gluons
central exclusive production for glue ball search at low missing ๐๐
Origin of transverse single spin asymmetries
Single diffractive dissociation / elastic scattering with increased statistics and extended ๐ก-range
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11 Run 15 Timeline
2014/12/03 West pole tip closed 2015/01/20 Cool down to 4 K, watch shifts ready 2015/02/03 First collisions at ๐ = 200 GeV, full shift crews 2015/02/10 Start of physics program in ๏ฟฝโ๏ฟฝ + ๏ฟฝโ๏ฟฝ FMS/FPS commissioning (gain iterations, trigger ready) 2015/03/10 Changing to transverse polarization 2015/04/02 Back to longitudinal polarization 2015/04/27 End of ๏ฟฝโ๏ฟฝ + ๏ฟฝโ๏ฟฝ 2015/05/04 Start of physics program in ๏ฟฝโ๏ฟฝ + ๐ด๐ด 2015/06/08 Changing to ๏ฟฝโ๏ฟฝ + ๐ด๐ด 2015/06/22 Begin cryo warm-up
PAC recommendations: โข 9 weeks of ๏ฟฝโ๏ฟฝ + ๏ฟฝโ๏ฟฝ, ๐ = 200 GeV โข 5 weeks of ๏ฟฝโ๏ฟฝ + ๐ด๐ด โข 2 weeks of ๏ฟฝโ๏ฟฝ + ๐๐
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FMS/FPS Roman Pots
IST
PXL
SSD
TPC MTD Magnet BEMC BBC EEMC TOF
Heavy Flavor Tracker
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13 Preshower at Forward Rapidities Forward Meson Spectrometer
476+788 PbGl towers
Preshower scintillator hodoscope
โ ๐ m downstream from nominal interaction point
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14 Forward Meson Spectrometer
no signal multiple gain jumps gain drift
example of drifting gain (large cell)
Radiation damage: discoloration of PbGl
FMS front view x (cm)
y (c
m)
FMS Status at the end of Run 13
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15 FMS Refurbishing in 2014
Replacement of PMT and bases
Curing of radiation damage
PbGl transparency after UV curing
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16 FMS Performance in Run 15 Invariant mass distributions in ๐ + ๐ด๐ด
๐ธ๐พ๐พ = 40 GeV/๐2
invariant mass (0 โ 1 GeV/๐2)
๐๐ป = ๐.๐ ๐.๐ GeV/๐ ๐.๐ ๐.๐
The FMS is in its best shape ever!
Gains balanced for ๐๐-triggering
Signs of radiation damage (not unexpected)
run index
Trigger performance jet patch 2 (high-๐๐)
Similar or better in ๐ + ๐ collisions
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17 Forward Preshower Construction Scintillator hodoscope 4.0 / 5.8 cm wide, 1 cm thick
Double pyramid light guide
SiPM readout Three layers for 2d hit
reconstruction 3 ร 84 channels Pb converter (d = 1 ๐0)
Wrapping at BNL Built in complete quadrants (โ 100 kg) Compact installation
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18 Preshower Performance in Run 15 ADC spectra vs. channel Matching with FMS clusters
Q1 Q2
Q3 Q4
cluster position la
yer 3
cha
nnel
Radiation damage: Monitoring of dark current in SiPM Collision related Very susceptible to background
mip response
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19 Roman Pot Detectors pp2pp setup from โ 55 m โ 15 m No special machine settings required
vertical Roman pot vessels
Roman pot Si strip detectors
Not possible without the help from CAD!!!
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20 PP2PP Performance in Run 15 Collinearity: elastic ๐ + ๐ scattering
Central exclusive production
๐๐ธ/๐๐ฅ in all layers
๐๐,๐๐๐๐ < 0.1 GeV/๐
Very successful operation pp2pp team & shift crew
Fast-offline alignment studies
no acceptance correction, statistical uncertainties only
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21 HFT Performance in Run 15 PXL damage in run 14
Improved protection against latch-up Refurbished inner ladders (๐ด๐ด)
Rate limit in SSD Longer internal busy time 1.2 ms Reduced common mode noise
Trigger rates 200~800 Hz PXL, IST, SSD included at
full rate in minimum bias data
PXL inner layer 4% dead sensors outer layer 5% dead sensors IST >92% active APV chips SSD lost 1 out of 20 ladders 6% dead wafers 90% of strips active
Improved performance in run 15
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22 Data Taking
Using a mix of 48 triggers through run 15 to achieve all of our physics goals
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23 Run 15 Performance typical 8 hour fill over 80% live
โข average DAQ dead time 15% โข take data when PHYSICS ON โข optimized balance of triggers
average live time
transverse longitudinal
12 hour fill
pC measurements
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24 Trigger Bandwidth in ๏ฟฝโ๏ฟฝ + ๏ฟฝโ๏ฟฝ
Jets/High-๐๐ป
Dimuons
Roman Pots
Heavy Flavor
TPC DAQ limit 1800 Hz
polarization measurements
example fill 18882
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25 Trigger Bandwidth in ๏ฟฝโ๏ฟฝ + ๏ฟฝโ๏ฟฝ example fill 18847
Trigger limit 3000 Hz
Jets/High-๐๐ป
Dimuons
Roman Pots
Heavy Flavor
polarization measurements
Forward Calorimeter
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26 ๐ + ๐ Reference ร 106 ร 106 Heavy Flavor
Dimuons
Roman Pots
goal
projected minimum
goal recorded recorded
recorded
All ๐ + ๐ goals reached or exceeded for heavy ion reference data in 2015!
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27 ๐ + ๐ Goals
Transverse polarization Single spin asymmetries: figure of merit โ ๐2 โ โ Based on โ = 40 pbโ1,๐ = 60% The incident: loss of four days due to power dip Achieved original projections from BUR in four weeks!
Jets/High-๐๐ป Forward Calorimeter
goal
recorded goal
recorded
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28 ๐ + ๏ฟฝโ๏ฟฝ Goals
full transverse polarization: ๐max โ 0.02
Longitudinal polarization Figure of Merit โ ๐4 โ โ Based on
โ = 50 pbโ1 ๐ = 60%
Spin Rotator Efficiency Transverse component
Pโฅ/P < 10% Polarization decay
ฮด๐/(๐ โ ๐ฟ๐ก) โ 2%/h
Falling short of originally projected goals for high-๐๐
Jets/High-๐๐ป
goal
recorded
Transverse asymmetries from ZDC scalers
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29 Trigger Bandwidth in ๏ฟฝโ๏ฟฝ + ๐ด๐ด example fill 19100
Jets/High-๐๐ป
Dimuons
Roman Pots
Heavy Flavor
TPC DAQ limit 1800 Hz
polarization measurements
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30 ๐ + ๐ด๐ด
Forward Calorimeter
projection
recorded
Roman Pots
projection
recorded
ร 106
Transverse polarization Figure of Merit โ ๐2 โ โ Based on โ = 300 nbโ1,๐ = 60% Roman pots only on proton side ๏ฟฝโ๏ฟฝ + ๐ด๐ด goals reached or exceeded!
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31 Run 15 Summary
Very successful operation in 2015 Reached or exceeded goals Reduced time compared to original beam use
request Only exception: highest ๐๐ range in ๐ด๐ฟ๐ฟ(jet) New and unique: transversely polarized ๏ฟฝโ๏ฟฝ + ๐ด๐ด
collisions
Recording ๏ฟฝโ๏ฟฝ + ๐ด๐ด collisions since early Tuesday morningโฆ
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32 Looking Forward 2017+ Drell-Yan production in Run 17
๏ฟฝโ๏ฟฝ + ๐ @ 500 GeV Forward rapidities 3 < ๐ < 4 (FMS) Refurbish preshower SiPM Add tail catcher: hodoscope similar to
preshower
Inner TPC Upgrade Increased active area, optimized pad size ๐ < 1.5 Improved ฮ๐/๐ and ๐๐ธ/๐๐ฅ
Event Plane Detector Large acceptance with radial
segmentation Fine granularity (single hits)
Prototype at Shandong
EEMC megatile prototype in Run 15
BES
II (2
018+
)
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Detector experts Operations team and support
Shift crews, Bill Christie &
period coordinators Trigger experts, board & computing
Collider-Accelerator Department & main control crews