# Presentation: 783589

## 2007 Run Update for STAR

- Jeff Landgraf
- For the STAR collaboration

## STAR’s BUR Goals

- Expected RHIC performance
- From W. Fischer Doc. Ver. 6/1/06

- To meet our AuAu goals we anticipate needing ~1.8 nb-1 of Delivered luminosity

- RHIC & AGS User Meeting - 6/21/2007

## STAR’s BUR Goals

- Expected RHIC performance
- From W. Fischer Doc. Ver. 6/1/06

- To meet our AuAu goals we anticipate needing ~1.8 nb-1 of Delivered luminosity

- 300ub-1  600ub-1 because our measurement of sampled luminosity this year doesn’t include a vertex

- RHIC & AGS User Meeting - 6/21/2007

## Additional Goals

- Progress on Detector Upgrade Prototypes
- Improved Vertex Detector (VPD)
- TPC DAQ upgrade (DAQ1000)
- Forward Meson Spectrometer (FMS)
- Muon Tracking Detector (MTD)
- Heavy Flavor Tracker (HFT)  (PIXEL)
- Prepare for an eventual Low Energy Au-Au Run
- Collider Commissioning
- Explore STAR’s Triggering Capabilities

- RHIC & AGS User Meeting - 6/21/2007

## Advances in STAR since the 2004 AuAu Run:

- The Full Barrel EMC is now installed
- The full SSD is now installed which enhances the capabilities of the SVT
- Improved capability to trigger on a narrow vertex using the new vertex position detector (VPD)
- Shielding was added to remove backgrounds from the Barrel EMC
- L2 Trigger System

- RHIC & AGS User Meeting - 6/21/2007

## These goals are reflected in several specific programs:

- A Minimum Bias program to Measure D’s using the SSD / SVT vertex to remove background
- A trigger on high Pt electrons to find B’s through their displaced vertex.
- Multi-particle correlations using high Pt Gammas
- First steps towards precision measurements of direct Gammas
- In addition there were several secondary physics goals which include:
- To measure the upsilon using the L2 trigger
- A ultra-peripheral collision program

- Revisiting the BUR:

- RHIC & AGS User Meeting - 6/21/2007

## The requirements for each program were condensed to the following list of triggers before the RHIC run began:

| Trigger Name | Trigger Definition | Rate |
| --- | --- | --- |
| MinBias (D’s) | ZDC_pre + VPD@5cm + (L2 monitoring) | ~30 hz |
| BHT2-mb (gamma) | ZDC + BHT2@~6GeV | 5 hz |
| BHT1-mb (B’s) | ZDC + BHT1@4.5GeV + VPD@5cm | 5 hz |
| Upsilon | ZDC + BHT1@4.5GeV + VPD@30cm + L2
 | ~40 hz L0/
  1   hz L2 |
| UPC | UPC  (5<zdcsum<240) (6<ctbsum<200) | 1 hz |
| UPC-jpsi | UPC + JPsi | 1 hz |
| Commissioning Triggers |  |  |
| Muon | ZDC + Muon | .1 hz |
| FMS | FMS |  |

- RHIC & AGS User Meeting - 6/21/2007

## In practice, we add triggers to monitor backgrounds, to help bootstrap luminosities, and to mark events for priority reconstruction to the final running configuration:

- The result is a mix of triggers which is optimized and focused towards our physics goals.

- RHIC & AGS User Meeting - 6/21/2007

## Collider Performance:

- The Collider has provided nearly the maximum projected integrated luminosity.

- RHIC & AGS User Meeting - 6/21/2007

## STAR Performance

**STAR Performance**

- STAR Data recorded as of June 20th, 8am

**87% of 600 ub-1**
**sampled**

**86% of 75M **
**minbias**

- Which puts STAR very close to obtaining our minbias and integrated luminosity goals.

- The integrated luminosity translates to a factor of 20 or more increase in statistical significance for rare probes, due to the increased acceptance and stability of the EMC, the improved vertex,  and increased delivered luminosity.

- RHIC & AGS User Meeting - 6/21/2007

## RHIC did a one day Low Energy Commissioning Run.

- STAR TPC image of root(s) = 9.91 GeV AuAu Collision
- Taken June 7, 2007.

- Run 8158119, Evt 44

- Star commissioned triggers and took a small amount of data

- RHIC & AGS User Meeting - 6/21/2007

## Run 8158119: (Low Energy Run)

**Run 8158119: (Low Energy Run)**
-  2288 BBC-small triggers
-  403 BBC-large triggers
-  214 both BBC small & large
-  1 VPD trigger

- RHIC & AGS User Meeting - 6/21/2007

## Detector Upgrades

- VPD
- DAQ1000
- FMS
- MTD
- HFT

- FWHM ~ 20 cm

- The VPD was Commissioned during the first few weeks of the RHIC run and its operation was critical to the physics program.

- RHIC & AGS User Meeting - 6/21/2007

## Detector Upgrades

- VPD
- DAQ1000
- FMS
- MTD
- HFT

- In fact, if you superimpose the vertex distributions as triggered by the VPD with the acceptance for crossing all 3 layers of the SVT, the VPD is almost the perfect detector for the job.

- RHIC & AGS User Meeting - 6/21/2007

## Detector Upgrades

- VPD
- DAQ1000
- FMS
- MTD
- HFT

- There is a TPC electronics upgrade to increase the maximum TPC event rate to a kilohertz while virtually eliminating the deadtime.   A single receiver board prototype was installed and is taking data.           (In red: data from DAQ1000 prototype.  In Black: current TPC)

- RHIC & AGS User Meeting - 6/21/2007

## Progress On Detector Upgrades

- VPD
- DAQ1000
- FMS
- MTD
- HFT

- The Forward Meson Spectrometer is a large extension of the Forward Pion Detector which was commissioned during the gold run and is now ready for production running in 2008

- RHIC & AGS User Meeting - 6/21/2007

## Progress On Detector Upgrades

- VPD
- DAQ1000
- FMS
- MTD
- HFT

- 2 LMRPC modules
- From fastoffline tracking
- Au+Au collisions No track-hit matching yet

- The Muon Tracking Detector uses the metal in the star magnet to clean up the Muon signal.  One module was installed and incorporated into the STAR trigger during data taking.

- RHIC & AGS User Meeting - 6/21/2007

## Progress On Detector Upgrades

- VPD
- DAQ1000
- FMS
- MTD
- HFT

- Pixel proto in STAR, measured track density at r = 5cm, z = 145cm

- A very small (4mm x 4mm) prototype of the PIXEL detector electronics was installed to at r=5cm to study the background near the beampipe.

- RHIC & AGS User Meeting - 6/21/2007

## Summary

- STAR is nearing the end of a successful run.
- The STAR trigger is strongly focused towards meeting the collaborations physics goals.
- STAR participated in the Low Energy test run and was able to obtain data.
- There is significant progress installing and testing new sub-systems and upgrade prototypes.

- RHIC & AGS User Meeting - 6/21/2007