# Presentation: 898462

## Beams Week in Review

- Accelerator Performance
-  Five stores
- Accelerator Study Period
- Store 1787 Average Peak Luminosity: 3.05 E31
-  Dreadful weekend

- All Experimenters Meeting

- 30 September 2002

## Beams Week in Review

- Notable Changes and Improvements

- All Experimenters Meeting

- 30 September 2002

## Peak Luminosity

- All Experimenters Meeting

- 30 September 2002

## Integrated Luminosity

- All Experimenters Meeting

- 30 September 2002

## Beams Week in Review

- Current Issues
- Increase the number of protons through MI coalescing
- Increase MI pbar coalescing efficiency to the 80 - 90% level
- Reduce proton and pbar bunch length into tevatron
- Increase proton and pbar lifetime at 150 GeV
- Reduce losses of proton  and pbar on ramp
- MI – Tevatron transfer line matching
- Increase Luminosity lifetime
- Improvement in pbar stacking rate

- All Experimenters Meeting

- 30 September 2002

## Accelerator Studies

- Major focus for studies *should* result in near term gains in Luminosity

- All Experimenters Meeting

- 30 September 2002

## Accelerator Studies, Tevatron

- Tevatron Tune and Coupling Drift
- Operational
- Tune drift from > 0.01 units to < 0.001 units
- Coupling drift from > 0.02 units to < 0.003 units
- Tevatron Dampers (two shifts)
- Horizontal damper beginning to be integrated into shot set up
- Vertical dampers, ready to commission with beam

- All Experimenters Meeting

- 30 September 2002

## Accelerator Studies, Tevatron

- MI-Tev lattice matching for A1 and P1 transfer lines
- Data taken and being analysed
- Loss on ramp vs longitudinal emittance
- Data taken and being analysed.
- Preliminary analysis indicate increased loss with proton bunches of higher intensity and longer bunch lengths.

- All Experimenters Meeting

- 30 September 2002

## Accelerator Studies, Tevatron

- 150 Gev and 980 Gev lifetime optimization using octupoles
- The octupoles show promise for suppressing instabilities at very low values of chromaticities.
- Have demonstrated this fact both at injection and  low beta for proton only beams on the central orbit and proton helix, respectively.

- All Experimenters Meeting

- 30 September 2002

## Tune and Coupling drift

- All Experimenters Meeting

- 30 September 2002

## Horizontal Transverse Dampers

- Damper off

- Damper on
- Chromaticity lowered by 2 units

- All Experimenters Meeting

- 30 September 2002

## Tevatron Electron lense

- Simulation on beam-beam force on pbarsUsed TEL adjusted to collide with protons

- -Want to move the pbar tunes closer to the diagonal

- Protons (no TEL)

- Protons with TEL

- All Experimenters Meeting

- 30 September 2002

## Accelerator Studies, Main Injector

- Reduction of longitudinal emittance for proton coalescing
- Main Injector 150 Gev lattice function measurement using TBT
- Tev-A1-MI optics verification
- Using reverse protons from tevatron
- First turn flash orbit

- All Experimenters Meeting

- 30 September 2002

## Proton Coalescing

- All Experimenters Meeting

- 30 September 2002

## Pbar Coalescing

- All Experimenters Meeting

- 30 September 2002

## Pbar Coalescing

- 2nd transfer : we were optimizing the paraphase angle between A and B pots

- 8th and 9th transfers were done with identical settings of A and B pots.
- There were more than 13 pbar bunches at injection in MI on 9th transfer
- and hence coalescing  efficiency is expected to be poor.

- All Experimenters Meeting

- 30 September 2002

## Main Injector Lattice 150 Gev

- Horizontal Lattice Measurement, TBT at 150 GeV

- All Experimenters Meeting

- 30 September 2002

## Main Injector Lattice 150 Gev

- Vertical Lattice Measurement, TBT at 150 GeV

- All Experimenters Meeting

- 30 September 2002

## Accelerator Studies, Pbar

- Re-phasing Debuncher cooling systems
- Characterization of AP2 aperture
- Characterization of Debuncher aperture

- All Experimenters Meeting

- 30 September 2002

##  Schedule for this week

- Stack ‘n Store Week
- Tevatron Store Monday 1400 and Tuesday around noon
- Resume Collider Operation Late Wednesday evening or early Thursday Owl shift
*12-16 hr access Wed starting at 6AM *
*Tevatron Maintaince*
*Pbar shots to Recycler*

- All Experimenters Meeting

- 30 September 2002

## Schedule for this Week

- All Experimenters Meeting

- 30 September 2002