# Presentation: 669260

## Beams Week in Review

- Report Covers 2 weeks (77 & 78) of Collider Operation from 8/26 thru 9/8
- Accelerator Performance
- Week 78 integrated Luminosity Record: 4.2pb-1
- Accelerator Studies and Access (week 77)
- The 7 Stores (week 78):
- Good Stores / Bad Stores

- All Experimenters Meeting

- 09 September 2002

## Beams Week in Review

- Several Issues Resolved
- He concentration in D0 Collision Hall
- A0 Abort Kicker trigger module
- TEL repaired
- Re-smoothed orbit through low beta squeeze
- Partly responsible for low initial luminosity in stores 1728 and 1730.

- All Experimenters Meeting

- 09 September 2002

## Beams Week in Review

| Store # | Initial Luminosity | Duration | Termination | comments |
| --- | --- | --- | --- | --- |
| 1691 | 2.43  E31 | 6.8  hours | Quench BBU VFC |   no known changes |
| 1711 | 2.31   E31 | 18.9   hours | intentional | TRF6 tripped,     during store |
| 1713 | 1.55   E31 | 2.1   Hours | Tev RF  |  TRF6 tripped,     TEL erratic
 |

*Store Summary Week 77*

- All Experimenters Meeting

- 09 September 2002

## Beams Week in Review

| Store # | Initial Luminosity | Duration | Termination | comments |
| --- | --- | --- | --- | --- |
| 1716 | 2.47   E31 | 7.1  hours | Abort  B0Q5 | D1 separator   |
| 1723 | 2.30  E31 | 10.6   hours | Abort 
C2 wet engine  |   no known changes |
| 1727 | 2.11   E31 | 9.9  hours | A0 abort kicker trigger module |   Beamloading compensation |
| 1728 | 1.82   E31 | 16.1   hours | intentional | 76% stack;  p –coherent |
| 1730 | 1.26   E31 | 8.6   hours | intentional | P -choerent |
| 1735 | 2.29   E31 | 24.7  hours | Quench E1 |   smooth orbit; 
TEL off |
| 1737 | 2.17   E31 | 18   hours | intentional | TEL off |

*Store Summary Week 78*

- All Experimenters Meeting

- 09 September 2002

## Beams Week in Review

- Last 2 weeks 50% intentionally terminated

- All Experimenters Meeting

- 09 September 2002

## Beams Week in Review

- All Experimenters Meeting

- 09 September 2002

## Beams Week in Review

- Shutdown work
- CDF COT Repair
- Recycler beamline Multiwire installation

- All Experimenters Meeting

- 09 September 2002

## Peak Luminosity

- All Experimenters Meeting

- 09 September 2002

## Integrated Luminosity

- All Experimenters Meeting

- 09 September 2002

## Tevatron Summary

- Week 77 Accelerator studies:
- Measured and corrected local coupling at the IR at 150 and up the ramp (not low beta)
- Test new Chromaticity measurement system
- Tevatron Dampers (closing the loop test)
- Damping demonstrated.. Continue to investigate reducing the noise floor

- All Experimenters Meeting

- 09 September 2002

## Tevatron Summary

- Measured Tune and Coupling Drift at 150 GeV

- Correction Scheme to be implemented during this week studies

- All Experimenters Meeting

- 09 September 2002

## Pbar Summary

- No Dedicated studies during this period
- Changed DRF2 (barrier bucket) frequency to better match the momentum cooling system
- Yield up to ~7% increase in pbars getting to Accumulator
- Pbar production remains in the  17 to 18E-6  with peak production of about 11.6 mA/hr for one hr.

- All Experimenters Meeting

- 09 September 2002

## Recycler Summary 

- Two Dedicated transfers from stacks of 35E10 to 50E10.
- Transfer efficiencies ranged from 50 to 95%
- Stacking efficiencies > 70%
- Lifetimes greater than 100 hrs with 45E10
- Shots “off the bottom”

- All Experimenters Meeting

- 09 September 2002

## Recycler Summary  

- Filling the Recycler

- All Experimenters Meeting

- 09 September 2002

## Schedule for this Week

- Monday: Collider Operation ( TEL back on line)
- Tuesday (~0400):  ~5 shift studies
- Wednesday (~1600):  Resume Collider Operation

- All Experimenters Meeting

- 09 September 2002

## Studies this week

- Tevatron
- Tevatron closure for pbars (BLT)
- Implementation of tune drift compensation
- MI-Tevatron Transfer Line Matching
- Investigate proton losses seen at CDF
- Orbit Coupling at interaction regions
- Non-linear tune & chromaticity vs orbit through interaction regions

- All Experimenters Meeting

- 09 September 2002

## Schedule for this Week

- All Experimenters Meeting

- 09 September 2002