# Presentation: 800915

## PHENIX Run 4 Preparation

- 2/27/2004
- RHIC Spin Collaboration Meeting
- Abhay Deshpande
- Stony Brook University
- RIKEN BNL Research Center

## PHENIX Aspirations

- An improved A_{LL} measurement  for pi^{0} production
- Tests of new detector concepts for future spin runs
- Relative Luminosity scintillator “telescope”
- R&D Future relative luminosity monitor
- Forward muon background measurement
- R&D future muon trigger upgrade
- (STAR) Scalar board tests and commissioning
- R&D future relative luminosity monitor & detector correlations
- In Run 4 PHENIX should be ready for all of the above to have realistic chance of using this in Run 5 & later
- Allow enough time for Jet Target to be commissioned
*Unlikely:* *absolute scale for polarization from this run?*

- Abhay Deshpande

- 2/27/04

## Summary: CAD run plan (Mei Bai)

**Goals:**
- 55 bunches with 1 x 10^{11} per bunch
- Average current/ring: 70 mA
- Peak luminosity: 11 x 10^{30} cm^{-2} sec^{-1}
- Average luminosity (?)
- Snakes (ON) and **spin rotators (OFF) --> We would like to have them ON!**

- Abhay Deshpande

- 2/27/04

## Run 4 pp CAD Plan (Mei Bai)

**Run Plan for 5 weeks (35 days)**
**Week 1**  **(March 26-April 1, 2004)**
- Jet target installation
- RF common cavity work
- Establish circulating beam in blue and yellow
- Instrumentation setup
- Machine tuning (orbit, working point,decoupling,optics)
- Begin jet target tuning
**Week 2 (April 2-9, 2004)**
- New working point development at injection
- Jet target tuning
- Ramp development (6 bunches,transmission, polarization)
- Ramp development (56 bunches, 1 x 10^{11} bunch intensity)

- Abhay Deshpande

- 2/27/04

## Run 4 pp plan (Mei Bai) 

- Week 3 (April 9-15, 2004)
- Jet target tuning
- Store activity: *beam lifetime, luminosity, background, polarization*
- Week 4 (April 16-22, 2004)
- Polarization development
- Store energy scan (radial and vertical polarization vs. slightly different store energies)
- Jet target Measurement (56 bunches, CNI measurements)
- Steady reliable reproducible machine operation
- Week 5 (April 23-30, 2004)
- 112 bunches with 1 x 10^{11} per bunch
- Different fill patterns
- 56 bunches with 2 x 10^{11} per bunch
- Spin tune measurement (1/2 day)
- Spin flipper commissioning (1/2 day)

- Abhay Deshpande

- 2/27/04

## What? Who? When?

**Possibly ~45% polarization & ~1-2 pb^{-1} data (minimum)**
- Longitudinal polarization: **A_{LL} pi^{0} production**
- Try:  improve up on the Run3 result by factors of ~3 in ****A_{LL}
- Ramps development with Spin Rotators ON **WEEK 2**
- Needs Local polarimetry readiness  **WEEK 2 **
**Detector tests for future runs:**
- Luminosity telescope (X. Wei et al.)
**WEEK 1 INSTALL & DEBUG**
- Forward muon arm upgrade (X. Wei et al.)
- Installation time for hardware (2-3 days) and testing
**WEEK 1 INSTALL & DEBUG**
- STAR Scalar boards (Marcus W.,Robert B. et al.)
- Intermediate board: GL1 board <--> Star scalars
- Couple with Spin Sorting: **COMMISSION: WEEK 2 or 4**

- Fig->

- Abhay Deshpande

- 2/27/04

## Telescope & RPC locations

- X. Wei et al.

- Abhay Deshpande

- 2/27/04

## What? Who? When?

- PHENIX Other General readiness:
- Spin sorting (Goto et al.) **Week 2**
- Trigger **Weeks 1,2**
- GL1P trigger board spin sorting (John L., Belikove, Yuji)
- LVL1: muIDLL1 (John L. et al.)
- LVL1: EMCal-RICH Trigger (ERT) (Kensuke, Frank et al.)
- For future use: LVL2 trigger (Tony F. et al.)
- tests planned in weeks 1-3
- DAQ (EVB-Group)
- For future use: Multi-event buffer
-  tests and development planned in weeks 1-3
- Online Monitoring (Chris P. et al.)
- We are encouraging all system specialists to be delay their vacations after a long Au-Au run
- Especially after the possible 2 extra weeks at 63 GeV CM

- Abhay Deshpande

- 2/27/04

## 1008 Activities Week-by-Week

**Week 1 in parallel with jet installation (~ 3 days)**
- Install luminosity telescope and RPC in MuID gaps
- Fix ERT ROC & start tests
- Install & check STAR scalar boards
- DAQ/EvB development for future runs
**Week 2**
- Local polarimeter ready to function
- DAQ/EvB development for future runs
**Week 3**
- DAQ/EvB development
**Week 4**
- Local polarimeter operational
- Triggers setup (perhaps earlier)
- DAQ needs to be ready for us
**Week 5**
**Take data when possible**

- Abhay Deshpande

- 2/27/04

## Optimist’s view....

- If the polarization in Week 5 is ~(45-50)%
- We intend to ask for extra ~2 weeks of runs
- This intent has already been expressed to the BNL management
- What can 2 times luminosity and 50% polarization do?
- Figure of merit:
- Sqrt[P_{y}^{2} * P_{b}^{2} * L dt]
*Assuming Run 3 luminosity:*
*Sqrt[(50/27)^{2}] --> 3.7 improvement in the stat error*

- Abhay Deshpande

- 2/27/04