# Presentation: 118604

## RHIC pp FY05 Run Preparation

- Mei Bai
- Collider-Accelerator Department
- Brookhaven National Laboratory

## Goals for Run 5

- Physics data taking
- Continuous machine development efforts to achieve maximum performance
- Polarization
- Luminosity
- Machine development for the future

## RHIC Run5 projection

|  | bunch intensity
[1011] | # of bunch | # of collision points | £store average*
[1030 cm-2s-1] | £per week**
[pb-1] | polarization at store |
| --- | --- | --- | --- | --- | --- | --- |
| Run5
min | 0.7 | 56 | 4(3) | 4.0 | 1.0 | 40% |
| Run5
goal | 1.0 | 56 | 4(3) | 8.0 | 2.0 | 45% |
| Run5
alternative | 0.7 | 112 | 4(3) | 8.2 | 2.0 | 50% |

## Job List – Shutdown period

-  improve the online model
-  tune control
-  chromaticity control
-  beta*: re-fitting for the new working point
-  improve the off-line non-linear model
-  improve the orbit control
-  bpm upgrade
-  predict the beam position for the missing bpm based on the online model
-  Spin tracking studies with the current working point
-  orbit effect
-  snake resonances

## Job List – Shutdown period

-  polarimeter upgrade
-  a more user-friendly application
-  helps to consolidate the useful information instead of fumbling through different pet pages which are only supposedly to be used for experts
-  a strip chart of polarization measurement is always good for operations
-  automated tracking of target with beam position
-  measure the beam polarization average over its distribution
-  separate the DAQ electronics among the three polarimeters: RHIC Blue and Yellow polarimeters as well as H Jets polarimeter

- Osamu ... ?

- Johannes, Osamu, Haixin

- Igo, Dima, ....?

## Machine developments for Run 5

-  target tracking
-  average polarization over the beam profile
-  turn by turn spin precession measurement
-  the integrity of the snake configuration
-  spin flipping
-  ramp up to 200 – 217 GeV, depending on what type of light ions.
-  injection & ramping with the rotators on

## Summary

- Run 5 is expected to be a long run for Physics
- The Physics will start with the minimum performance we have achieved during Run4 and expect to achieve best performance based on the continuous tuning up efforts in RHIC and AGS, esp. the AGS progress on the cold snake
- Efforts will also be made for achieving the goals for the long run

## Preliminary Run Plan

-  H Jets installation and common cavity short-out: 3 days: 9 shifts
-  AGS synchro setup
-  ps work if needed
-  others
-  establish injection:12 shifts
-  injection kicker timing, circulating, capturing: 1
-  set the rf frequency and adjust the dipole fields to center the beam:1
-  rf loop setup: 0.5
-  instrumentation setup: 8
-  polarimeter
-  Artus, transverse damper
-  Bpms
-  WCM, PLL, IPM, BLM, ...
-  machine tuning: 1.5
-  orbit correction, decoupling, chromaticity correction

## Preliminary Run Plan

-  rf setup: brho loop
-  decoupling along the ramp
-  establish tunes/chromaticity/orbit at store
-  decoupling at store
-  cogging setup
-  rotator ramp development: 2 shifts
-  tunes/chromaticities along the ramp
-  adjust the store rf frequency for different path length
-  establish the collision: 1 shifts
-  IR steering
-  fine cogging setup
-  56x56 bunch development: 4 shifts + 2 shifts of overnight store
-  provide stores overnight for detector timing
-  collimator setup
-  vernier scan

## Preliminary Run Plan

-  continue the machine tuning 8-12 hours during the daytime and provide
-    production stores afterwards
-  fine tuning of the ramp to improve the beam&polarization  transmission
-    efficiency
-  orbit correction
-  IR non-linear correction
-  chromaticity along the ramp
-  snake current scan
-  polarization ramp measurements
-  During the production period
-  deliver the production stores: operation crew
-  scheduled _[machine developments](slide6.xml)_
-  directly related to the RHIC spin program
-  planned weekly beam-experiment
-  more wide range