# Presentation: 885490

## Beams Week in Review

- Collider Operation
- Accelerator Studies
- MiniBoone Start up
- Beam on target
- Good Stores / Bad Stores

- All Experimenters Meeting

- 26 August 2002

## Beams Week in Review

| Store # | Initial Luminosity | Duration | Termination | comments |
| --- | --- | --- | --- | --- |
| 1672 | 1.66  E31 | 12.3  hours | intentional |  E48Kick failure, 36X32 store |
| 1679 | 1.99   E31 | 4.75   hours |  TECAR | Tev RF glitch, orbit smooth on ramp |
| 1680 | 1.55   E31 | 2.1   Hours | Tev RF  |   |
| 1686 | 1.28   E31 | 12.5 hours | Quench A4  (wet engine) |   |

*Store Summary*

- All Experimenters Meeting

- 26 August 2002

## Beams Week in Review

| Store # | Initial Luminosity | Duration | Termination | comments |
| --- | --- | --- | --- | --- |
| 1687 | 2.06   E31 | 19.3  hours | intentional | Chromaticity adj  on inj pbars, tune adj at HEP  |
| 1689 | 2.08   E31 | 18   hours | intentional |   no known changes |

*Store Summary*

- All Experimenters Meeting

- 26 August 2002

## Peak Luminosity

- All Experimenters Meeting

- 26 August 2002

## Integrated Luminosity

- All Experimenters Meeting

- 26 August 2002

## Tevatron Summary

- Studies included
- Tevatron Horizontal bunch by bunch
- TEL
- Turn by turn hardware characterization  (BLT)
- Instabilities at 150 and 980 due to chromaticity

- All Experimenters Meeting

- 26 August 2002

## Pbar Summary

-  Improvements in Stacking
- Up to 12 mA/hr with small stacks
- Production up to 20E-6 pbars/proton
- Studies Last Week (Accelerator Measurements)
- Debuncher momentum aperture
- Debuncher admittance 26.8 x 20.4 p-mm-mr (H & V)
- Debuncher central orbit (compared to Aptil 02)
- Accumulator admittance 8.4 x 7.6 p-mm-mr (H&V)
- Accumulator tunes
- Centered stack tail kickers ( reduced transverse heating of stack)
- Many Changes (no one big bullet)

- All Experimenters Meeting

- 26 August 2002

## Pbar Summary 

- All Experimenters Meeting

- 26 August 2002

## MI Summary

- Continued work on Beam loading compensation for pbars
- Coalescing efficiency
- 76% for stacks > 120 mA
- 82% for stacks < 120 mA

- All Experimenters Meeting

- 26 August 2002

## Recycler Summary - Beam Lifetime

- Design Lifetime:    ~100 Hours
- Measured Lifetimes:
- Small Emittance Proton Beams: 80-100 Hours
- Uncooled Protons:
- (3 / hour emittance growth)  10-20 hour lifetimes
- Cooled Pbars  (small intensity & emittances)
- 100-150 hr lifetimes with  ~ 10E10
- Cooled Pbars  (realistic intensities   50~100E10)
_*to be tested starting this week*_

- All Experimenters Meeting

- 26 August 2002

## Recycler Summary  -  Circulating Aperture

- Design Aperture:  (H & V)  40 
- Measured Aperture for Circulating beam:
- 50  Horizontal
- 40  Vertical
- Improvements due to
- Corrector Power supplies installed ~June
- Machine Survey and Alignment
- Aperture Scan Work by RR Commissioning Crew

- All Experimenters Meeting

- 26 August 2002

## Recycler Summary  -  Beam Transfers

- Recycler Injection Efficiency (Protons)
- Protons scraped to <10  emittance:  ~100%
- Protons from Booster (15  +tails):  ~90-95%
- “Round Trip” Efficiency MI-RR-MI ~85%
- Multiwire installation in Transfer Lines to further optimize injection matching

- All Experimenters Meeting

- 26 August 2002

## Schedule for this Week

- Monday: Collider Operation ( and pbar studies)
- Tuesday (0000):  3 1⁄2  shift studies
- Wednesday (0730):  3 shift M&D
- Thursday (0730): Accelerator startup Resume Collider Operation
- Friday: Continue Collider Operation           and pbar’s to the Recycler

- All Experimenters Meeting

- 26 August 2002

## Studies this week

- Tevatron
- Investigate proton losses seen at CDF
- Orbit Coupling at interaction regions
- Tevatron closure (BLT)
- Tevatron longitudinal damper (close the loop)
- Non-linear tune & chromaticity vs orbit through interaction regions

- All Experimenters Meeting

- 26 August 2002

## Schedule for this Week

- All Experimenters Meeting

- 26 August 2002