# Presentation: 420893

## PHENIX Run8 Achievements & Summary

- Mike Leitch for PHENIX
- RHIC/AGS User Mtg., 29 May 2008
-  Luminosity, Performance, J/’s
-  Efficiency & Interaction diamond size
-  Data Acquisition (DAQ)
-  p+p Polarization & Spin goals
-  Low Energy Au+Au test
-  Shutdown & Future

- Projected Run8 d+Au J/ RdAu improvement

- 5/29/2008

- PHENIX - MJL

## PHENIX Data Sets

**Collided 4 different species in 8 years:  Au+Au, d+Au, p+p, Cu+Cu**
**6 energies run:  9.2 GeV, 19 GeV, 22.5 GeV, 62.4 GeV, 130 GeV, 200 GeV**

**30 x dAu**

**3 x AuAu**

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## PHENIX Detector Configuration for Run8

- PID at higher pT with TOF-W

- RXNP – huge improvement in AuAu reaction plane

- HBD out for rework until next year

- Two MPC’s – nice for asymm dAu collisions

- 5/29/2008

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## Waste No Rare Triggers – the PHENIX Strategy

**thresh:**
**2.8 GeV**
**3.5 GeV**
**2.1 GeV**

- Actual trigger setup & rates for one of the hottest Run8 dAu runs
-  > 90% livetime
-  85khz MB (BBCVtxCut) rate

-  J/  +-

-  J/  e+e-

-  central-arm
******,********0****,********±**, etc

- MPC Forward
- Calorimeter

*(32 triggers total – some not shown)*

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## dAu

-  peaks above 3 nb-1 per day
-  one day > total Run3 luminosity of 2.7 nb-1

| Run | Energy | Long. | Trans. |
| --- | --- | --- | --- |
| 02 | 200 GeV |  | 0.15 pb-1 |
| 03 | 200 GeV | 0.35 pb-1 |  |
| 04 | 200 GeV | 0.12 pb-1 |  |
| 05 | 200 GeV | 3.4 pb-1 | 0.16 pb-1 |
| 06 | 200 GeV | 7.5 pb-1 | 2.7 pb-1 |
| 06 | 62.4 GeV | 0.08 pb-1 | 0.02 pb-1 |
| 08 | 200 GeV |  | 5.2 pb-1 |

- 5.2 pb-1 200 GeV p+p Transverse Vertical luminosity recorded
- (1.1 pb-1 FOM)
- Peak luminosity per day ~0.37 pb-1

- pp -  almost no progress on luminosity & polarization development towards future

- PHENIX - MJL

## PHENIX J/’s from Run8

- 5/29/2008

- PHENIX J/’s from Run8

- PHENIX - MJL

## d+Au

- 200 GeV d+Au
-  Live Time – 89%
-  PHENIX up – 77%
-  Overall – 68%

- 200 GeV p+p
-  Live Time – 89%
-  PHENIX up – 69%
-  Overall – 62%
- (where 10% correction for loss due to CNI measurements is made)

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- Efficiency for Run8 d+Au and p+p

*Black vertical lines are markers for Maintenance and/or APEX days*

- About 50% of CA delivered luminosity is useful  luminosity within our ±30 cm vertex range
- Given that, PHENIX efficiencies in Run7 were:

- p+p

**Notes:**
dAu – BBC 88%x2.26b, ZDC 0.52 b; pp – BBC 53%x42mb, ZDC 0.31 mb

## The Persistent Problem of Interaction Diamond Sizes

- With present interaction diamond z-size only about 50% of the CA delivered luminosity fits within our ±30 cm vertex range
-  with Stochastic Cooling (longitudinal) and full voltage 200 Mhz RF it is thought that the vertex can be narrowed to ±20 cm for AuAu collisions
-  super Beta quads could help
-  for pp collisions 9 Mhz cavity will help
-  but the Vertex detector upgrades require ±10 cm cuts, which even for ±20 cm distributions, will give only a 38% efficiency!

- PHENIX - MJL

## PHENIX Data Acquisition (DAQ)

- Run7 DAQ performance:
-  up to 5 khz min-bias event rate with 700 Mb/sec throughput

- Run8 trigger & DAQ performance:
-  triggers set to avoid saturation of DAQ bandwidth
-  event rates up to 7 khz

- PHENIX - MJL

- Run7
- Au+Au

- Run8

## PHENIX DAQ/Trigger Planned Improvements

- Near Term, building on Run7/8 progress – goal 7 khz events rate
- improved front-end data compression (FPGA reprogramming)
- faster Master Timing Module (GTM) recovery from 4-events buffered
- modernize and increase numbers of Buffer Boxes for data storage
- muon identifier 2-D road-finder trigger
- Longer Term – higher speeds with larger data volume from upgrade detectors
- forward rapidity muon trigger upgrade – primarily for W triggers
- new muon tracker lvl-1 capable electronics
- RPC to identify high momentum (with above) and reject out-of-time backgrounds
- faster data collection modules (DCM-II)
- faster Event Builder ethernet Switch (10 GB)
- additional BBC lvl-1 boards to provide multiple z-vertex cuts
- Global lvl-1 with >32 triggers
- stable clock through injection, ramps, dumps
- new EmCal front-end electronics to provide stable, sharp turn-on triggers
- lvl-1 trigger systems for silicon vertex detectors
- de-multiplex (part of) the front-end electronics

- 5/29/2008

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## Polarized Proton Accelerator Developments?

| Reduction in * (from 90cm to 50cm) | +80% | Success in APEX, not in operation |
| --- | --- | --- |
| Nonlinear chromaticity correction | +30% | Partial success? |
| Quadrupole jump in AGS | polarization | Not tried |
| 9 MHz cavity | +25% at *=1m | Hardware was not ready. |
| LEBT/MEBT + Booster injection modification | +20% | Not tried |
| Eliminate triplet vibration | +5-10% | No easy solution |
| Near (half) integer working point (near integer requires damping of triplet vibration or orbit feedback beyond IP) | +40% | Gave up because of triplet vibration |
| 56 MHz cavity  |  | Mainly for HI collisions |
| Electron lens | +100%?? | For the future |

- (items listed by Wolfram – 21 Apr 2008 RSC mtg)

- The short 2008 p+p run was not so good for accelerator development.
**A serious p+p run requires SUBSTANTIAL DEVELOPMENT TIME!**

- 5/29/2008

- PHENIX - MJL

## Low Polarization in Run8 p+p

-  50% blue, 41% yellow
-  Very little polarization development time
-  PHENIX forced to abandon radial polarization
-  x1/2.3 in significance
-  Anti-correlation of polarization with intensity
-  Jet polarimeter measurements good, especially when both beam done simultaneously
-  CNI measurements give large backgrounds & cost ~10% of delivered luminosity
-  need to make then faster
-  Local (experimental) polarimetry very useful
-  PHENIX needs to find a way to do it routinely (independent of main DAQ)

- CNI polarization vs store#

- PHENIX LPol asymmetry - Blue

- PHENIX LPol asymmetry - Yellow

- Blue

- Yellow

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## PHENIX Local Polarimeter

**S. Dairaku & J. Koster**

*** statistics uncertainty only **

- Fill #

- Fill #

- Amplitude

- Phase

- PHENIX Local Polarimeter raw asymmetries vs fill #
-  data taken using large fraction of DAQ for a few stores to get high statistics
-  need to develop a way to do for all stores in future

- 5/29/2008

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## PHENIX Run8 Local Polarimeter Compared with CNI Measurements

*** statistics uncertainty only **

**S. Dairaku & J. Koster**

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## PHENIX Spin Physics Goals – Can we Get there from here?

- 5/29/2008

- ALL(0) goal is 71 pb-1 with 65% polarization
-  gluon contribution (G) to the nucleon spin

- 500 GeV W goal is about 300 pb-1 recorded at 70% polarization
-  dbar, ubar contribution to the nucleon spin

- Radial Polarization goal was 7.5-10 pb-1 at 60% polariz.
-  Sivers – (7.5*0.602)/(5.2/2.3*0.5*0.41) = 5.8 short of goal
-  factor of 2.3 due to not having Radial polarization
-  Mono-jets – p+p is baseline for d+Au
-  MPC on both sides for d+Au is a plus

- Run9 – Need p+p – can’t live another year without a STRONG p+p run with ample development towards higher FOM!

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## 9.2 GeV Au+Au 2-day test Run

- 5/29/2008

- Few hz rate of BBCLL1 without a vertex cut

- Short stores
- ±1.5 meter int. region

- Small fraction of triggers inside BBC z region + large beam-gas like side peaks

- 19% in ±100 cm
- 7.3% in ±30 cm

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## 2008 Shutdown Activities at PHENIX

- Shutdown work includes:
-  HBD reinstallation
-  Repairs to:
-  Pad Chamber FEE
-  DC wires
-  Muon arms & forward trigger upgrade:
-  Muon Tracking HV
-  FEE installation (north + 1 octant of south)
-  RPC  (1/2 octant of south muon arm)
-  Scaffolding for above
-  New 10 cm diameter beam pipe (if time)

- HBD

- RPC

- Beam Pipe

- Scaffolding

- Muon Trigger FEE

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## Muon W-Trigger FEE Upgrade – Final Prototype Test During Run8

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## PHENIX Run8 Summary

-  **d+Au was fantastic! - x30 over Run3**
-  baseline for future A+A
-  new level of precision on intrinsic Cold Nuclear Matter physics
-  now p+p is the weakest part of baseline
-  **p+p was disappointing**
-  polarization was very poor
-  a strong p+p run with ample beam/polarization development is a must for the future
-  **PHENIX efficiency for recording useful luminosity up from 50% in past to 68% now (33% in ±30 cm)**
-  DAQ developments continue to push to higher event rates
-  but tighter z-vertex requirements in the future will lower fraction of luminosity that is useful
**THANKYOU to CA for a great (d+Au) Run!!**

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## Backup Slides

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*Backup Slides*

## Recorded/Delivered  Luminosity Ratio

|  | BBCeff | ZDCeff |
| --- | --- | --- |
| d+Au | 2.26 b x 88% | 0.52 b |
| p+p | 42 mb x 53% | 0.31 mb |
| Au+Au | 9.8 b x 92% | 9.8 b |

|  | PHENIX | LT |
| --- | --- | --- |
| d+Au | 68% | 89% |
| p+p | 62% | 89% |
| Au+Au* | 65% | 90% |

- * Last two weeks of Run7 AuAu

- PHENIX * VTX = 0.68 * 0.5 = 0.34

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## Summary of PHENIX Proposal for Run 9-13

| RUN | SPECIES | √sNN(GeV) | PHYSICSWEEKS |  L dt (recorded) | p+p Equiv. |
| --- | --- | --- | --- | --- | --- |
| 9 | p+p
Au+Au | 200 or 500
200 | 10 or 5
~10 | 
 25/25 pb-1
 1.2-1.4 nb-1 | 
25 pb-1
56 pb-1 |
| 10 | p+p | 500/200 | 5 or 10 | 25 pb-1 | 25 pb-1 |
|   | p+p
Au+Au | 62.4,39,28, 22.4
62.4, 39. 28 | 2.5
15 |  |  |
| 11 | Au+Au | 200 | M |  |  |
|   | p+p | 500 | 25-M |  |  |
| 12 | U+U
p+p | 200
200 | N
25-N |   |   |
| 13 | p+p | 500 | Q |  |  |
|   | Au+Au | various | 25-Q |   |   |

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