# Presentation: 689546

## RHIC pp Plan

- Mei Bai
- Brookhaven National Laboratory
- http://www.agsrhichome.bnl.gov/AP/Spin2005/

## Status

- A ramp for Physics at 100GeV is prepared(pp21)
- Preparing pp22 for the 205GeV ramp
- BPM Plans
- Fix the snake and rotator bpms during the access time
- BPM integrity checkup
-  goal: to get rid of all missing wiring problem
- Double check the DX bpms at IP12 for Jet and BPMs for CNI polarimeter
- CNI polarimeter: on schedule
- H Jet polarimeter: on schedule
- AGS status: Haixin’s talk

## AGS cold status

- Everything is buttoned up and ready for cool-down (Friday night).
- Low level testing once the magnet is cooled
- Full testing
- Ready to deliver
- Estimate still holds for March 30. Could be a couple of days earlier if everything goes smoothly.

## pp21

## Timeline and Run Plan

- March 24, 0800:
- end of Cu run and beginning of pp run
- Maintainence: 8 hours
-  experiment setup
-  ps work by George: 4 hours

## Timeline and Run Plan

- March 24 - March 26 0800
- Injection setup
-  circulating beam with snakes and experimental magnets on
-  Rf capture
-  beam instrumentation setup
- Bpm timing and integrity check-up: 6 hours
- RHIC tunemeter and injection damper timing
- IPM, PLL, Schottky, BLM threshold
- CNI polarimeter: existing Si detector and targets
-  tune and chromaticity setup
-  orbit correction: ~0.5mm
-  decoupling
-  snake current scan

## Timeline and Run Plan

- March 26 – March 30 0800
- Energy Ramp development
-  Brho loop
-  tune the tunes and chromaticities
-  orbit corrections
- March 30 0800 – April 1 0000
- RHIC access
-  Jet target installation
-  CNI new target and detector installation
-  bpm work
- Fix the miss wiring bpms
- Add 6 more planes
- Fix the snake and rotator bpms
- Cross check the bpm at IP12
-  AGS cold snake installation

## Timeline and Run Plan

- April 1  – April 7
- Resume the ramp development
- Commission the CNI polarimeter with new Si detectors

## Timeline and Run Plan

- April 7 – April 10
- Establish collisions: steering, collimation, ...
- April 10 – April 16
- Fine tune the ramp to improve polarization
- Provide collisions overnight for experiments
- April 16 – June 25
- Spin Physics: 9 weeks
- polarimeter calibration using Jet at injection
- Machine development
-  acceleration to 205 GeV
- Polarization development
- Phobos 24 hours collision data taking at 205 GeV

## Schedule

- polarimeter calibration using Jet at injection
- Results from FY2004 data
- How long is needed
- Machine development
-  acceleration to 205 GeV
-  start as soon as we are in the steady Physics run phase
-  3 – 6 DAY shifts needed to develop the ramp before polarization development
- Phobos pp data taking at 205GeV
- 24 hours data taking
- At the end of pp run

## Acceleration beyond 100 GeV

- Plan
- Develop the ramp to 205 GeV
- Measure the polarization/orbit distortion along the ramp
- Control the working point in the box free of snake spin resonances
- Locate where beam gets depolarized. If the depolarization is dominated by a single location, scan the orbit distortion around that location vs. the amount of depolarization loss
- Develop the ramp to 170 Measure the polarization/orbit distortion along the ramp
- Scan the orbit distortion around 135 GeV where the strong intrinsic resonance is located vs. the beam polarization. Maintain the working point away from snake spin resonances

## Challenge of going beyond 100 GeV

-  p=217 GeV
- This gives the same Brho
- as Cu and one can avoid
- an additional DX magnet
- training

- Intrinsic spin resonance
- Qx=28.73, Qy=29.72, emit= 10

- achieved