# Presentation: 248180

## MI Performance and Plans

- Ioanis Kourbanis
- Beams/MI

- AAC Review May 13-15, 2002

## $29 Stacking Cycles

- Typical stacking intensities are 4.5-4.8E12
- We have performed a series of emittance measurements to understand the beam quality at injection and extraction.
- There is a 20% horizontal emittance blow-up through the cycle and a factor of 2 blow-up in the longitudinal emittance mostly at transition.

- AAC Review May 13-15, 2002

## $29 Cycle Intensity

- AAC Review May 13-15, 2002

## $29 Longitudinal Emittance vs Energy

- AAC Review May 13-15, 2002

## $29 Horizontal Emittance vs Energy

- AAC Review May 13-15, 2002

## $29 Vertical Emittance vs Energy

- AAC Review May 13-15, 2002

## $2B Proton Coalescing Cycles

- Currently we are coalescing 7 Booster bunches into one bunch with typical intensities of 280-320 E9 ppp.
- Typical coalescing efficiencies are 75-80% with 12-15% in DC beam and 8-10% in sattelites.
- Booster mode dampers are essential for the $2B operation at high intensities.
- Dispersion has to be taken into account when we calculate the horizontal emittance of the coalesced beam.
- There is a 20% blow-up in transverse emittance and a 30% in the longitudinal emittance through the cycle.

- AAC Review May 13-15, 2002

## Proton Coalescing Intensities

- AAC Review May 13-15, 2002

## Proton Coalescing Intensities (2)

- AAC Review May 13-15, 2002

## $2B Horizontal Emittances vs Intensity

- AAC Review May 13-15, 2002

## $2B Horizontal Emittance vs Number of Bunches Coalesced 

- AAC Review May 13-15, 2002

## $2B Horizontal emittances vs Intensity 

- AAC Review May 13-15, 2002

## $2B Longitudinal Emittance vs Time

- AAC Review May 13-15, 2002

## Effect of Booster Mode Dampers on $2B Injection

- AAC Review May 13-15, 2002

## $2A Pbar Coalescing Cycle

- Currently we are accelerating and coalescing 4 pbar batches of 7-11 bunches each.
- The Acceleration efficiency is greater than 99% and the coalescing efficiency varies between 65-90% depending on the longitudinal emittance of each pbar batch.
- There is 20% horizontal emittance blow-up through the cycle while the longitudinal emittance blow-up varies between 30-60%.
- Beam loading during coalescing is affecting the longitudinal emittances of the pbar bunches.

- AAC Review May 13-15, 2002

## Pbar Intensities

- AAC Review May 13-15, 2002

## Pbar Horizontal Emittance vs Energy for 5 Different Stores

- AAC Review May 13-15, 2002

## Pbar Longitudinal Emittances vs Energy for one Store

- AAC Review May 13-15, 2002

## Pbar Longitudinal Emittance after Coalescing vs Batch Number 

- AAC Review May 13-15, 2002

## Pbar Coalescing

- AAC Review May 13-15, 2002

## Feed-Forward Beam Loading Compensation

- Recently we implemented feed-forward beam loading compensation in all 18 53Mhz rf stations.
- Currently the compensation is operational at 150 GeV during proton coalescing and provides 20-25 db reduction to beam loading.
- Leakage through the up-convert module currently prevents us from turning off the 53 MHz stations during the second segment of coalescing (2.5 MHz rotation).
- We have started studies in order to implement the feed-forward during pbar coalescing.

- AAC Review May 13-15, 2002

## Beam induced signal with and without Feed-forward

- AAC Review May 13-15, 2002

## Effect of Beam Loading Compensation on Debunching During Proton Coalescing

- AAC Review May 13-15, 2002

## Future Studies and Plans

- Understand and Correct the Horizontal Emittance Blow-up during Acceleration.
- Measure the horizontal emittance during acceleration using flying wires and ion profile monitors.
- Calibrate and measure the tunes through the $29 and $2B cycles.
- Understand and Correct the Longitudinal Emittance Blow-up.
- Debug the feed-forward Beam Loading Compensation and make it operational during Proton and Pbar Coalescing.

- AAC Review May 13-15, 2002