# Presentation: 760976

## Week in Review: 12/30/02 –1/05/03

**  ****Ron Moore – FNAL**

- Store Summary – Best week!  > 7 pb-1
- Machine Studies/Maintenance
- Schedule for Week

- All Experimenters' Mtg - 6 Jan 03

## Store Summary

| Store | Initial
Lumi | Deliv’d
Lumi | Termination | Comments |
| --- | --- | --- | --- | --- |
| 2114 | 30.7 | 1437 | Intentional | Quench @ F48 on abort |
| 2116 | - | - | Abort | Quench @ A11 at flattop before squeeze |
| 2121 | 21.8 | 695 | Intentional | Shot from 100 mA stack;
Quench @ F48 on abort – pbar orbit too high |
| 2123 | 25.5 | 742 | Intentional | Shot from 120 mA stack;
Only 11% pbar loss up ramp; end-of-store studies |
| 2134 | 28.8 | 1362 | Intentional | No changes; 11% pbar loss on ramp again |
| 2136 | 30.3 | 1449 | Intentional | No changes; 11% pbar loss on ramp again |
| 2138 | 29.7 | 1681 | Intentional | Poorer pbar lifetime @ 150 GeV;
2 hrs end-of-store studies |

- R. Moore - FNAL

- All Experimenters' Mtg - 6 Jan 03

## Slide 3

- R. Moore - FNAL

- All Experimenters' Mtg - 6 Jan 03

## Slide 4

- R. Moore - FNAL

- All Experimenters' Mtg - 6 Jan 03

## Slide 5

- R. Moore - FNAL

- All Experimenters' Mtg - 6 Jan 03

## Tevatron

- Pbar loss up ramp much improved
- The little chromaticity changes finally made an impact
- Loss down to typical  10-12%  from  18-20%
- Measured chromaticities up ramp
- First time since making many small changes
- Requires 2-3 ramps at various RF frequency settings
- Smoothed flattop, squeeze orbits
- Pbars were too high at A0, could not abort cleanly
- Tested software to help automate aperture scans
- Computing Division contributing to project
- Successful!  Continue implementation...

- R. Moore - FNAL

- All Experimenters' Mtg - 6 Jan 03

## Chromaticity on Pbar Helix on Ramp

- Dec 18
- Jan 3

- Desired  values
- Uncertainty  2 units

- R. Moore - FNAL

- All Experimenters' Mtg - 6 Jan 03

## Test of Aperture Scan Software

- Horz corrector E42
- Horz corrector E44

- R. Moore - FNAL

- All Experimenters' Mtg - 6 Jan 03

## Recycler Pbar Shots

- 5 attempts throughout last week
- Best transfer Accumulator  Recycler  efficiency = 87%
- Shot-setup + shots  down to 45 minutes
- Exercising multiwires in transfer line
- First successful operation
- Lower transfer efficiency when wires in
- See instability in stashed beam – cause unknown
- Poor lifetimes during shots, while merging beam
- Extracted and accelerated in Main Injector
- Still not coalescing in MI
- Try to get 100 E10 in Recycler this week

- R. Moore - FNAL

- All Experimenters' Mtg - 6 Jan 03

## RR21 transfer line multiwires

**RR21 transfer line multiwires**

- R. Moore - FNAL

- All Experimenters' Mtg - 6 Jan 03

## Recycler instability

**RR intensity**
**E11**

**MI mag power**

**RR V emit**
**pi mm mrad**

**RR H emit**
**pi mm mrad**

- R. Moore - FNAL

- All Experimenters' Mtg - 6 Jan 03

## Recycler shots on 1/05

**RR intensity**
**E11**

**ACC intensity**
**E10**

**RR V emit**
**pi mm mrad**

**RR H emit**
**pi mm mrad**

- R. Moore - FNAL

- All Experimenters' Mtg - 6 Jan 03

## This Week’s Schedule

- Access today until 16:00, turn-on in evening
- 5 shifts studies/maintenance starting this evening?
- Pbar stacking studies with small stacks
- Shoot to Pbars to Recycler
- Expect next HEP shot Wednesday evening
- Booster cool-down begins Sat 1/11
- Reduce MiniBoone rate
- Reduce # turns used for stacking
- Tevatron store terminated by 22:00 1/12 for cryo

- R. Moore - FNAL

- All Experimenters' Mtg - 6 Jan 03

## Weekly Schedule

- R. Moore - FNAL

- All Experimenters' Mtg - 6 Jan 03

## Summary

- Best week for delivered luminosity:   > 7 pb-1
- 1 store lost before collisions, 2 shifts studies, Recycler pbar shots
- Achieved 87% Accumulator  Recycler transfer eff.
- Lifetime waiting for shot, instabilities are problems
- Access ending for Tevatron surveys, Main Injector RF repair, vacuum work
- 5 shifts of dedicated studies this week
- Stack and store from Wednesday evening until Sunday 22:00
- Long shutdown begins Jan 13...

- R. Moore - FNAL

- All Experimenters' Mtg - 6 Jan 03