# Presentation: 792038

## Week in Review: 12/2/02 – 12/8/02

**  ****Ron Moore – FNAL**

- Store Summary
- Studies Summary
- This week’s schedule

- All Experimenters’ Meeting – 9 Dec 02

## Store Summary

| Store | Initial
Lumi
(E30 
cm-2 s-1) | Deliv’d
Lumi
(nb-1) | Termination | Comments |
| --- | --- | --- | --- | --- |
| 2019 | 29.8 | 1317 | quench | Quench in end-of-store studies (pbar removal) |
| 2043 | 25.5 | 1143 | Intentional | Tev transverse dampers off |
| 2045 | 29.8 | 1444 | Intentional | Tev dampers off |
| 2047 | 23.5 | 938 | Intentional | Tev dampers off; pbar RF problem affects coalescing in MI |
| 2049 | 24.8 | 888 | Intentional | Tev dampers off; pbar RF problem affects coalescing in MI |

- R. Moore - FNAL

- All Experimenters' Mtg - 9 Dec 02

## Slide 3

- R. Moore - FNAL

- All Experimenters' Mtg - 9 Dec 02

## Slide 4

- R. Moore - FNAL

- All Experimenters' Mtg - 9 Dec 02

## Maintenance/Repairs

- Linac tank 5 developed leak on valve
- Wiped out most of Tuesday studies
- Replaced PA on LRF5     (only had 2800 hours)
- Did Linac, Booster, Pbar safety system tests
- Upgraded VFCs at A3 and A4
- Tev Flying Wire tests
- Moved a tiltmeter in Tev
- Measured for cables for new Schottky in Tev

- R. Moore - FNAL

- All Experimenters' Mtg - 9 Dec 02

## Tev Study Highlights

- Study “snapback” effect on tunes, chromaticity early in ramp as function of length of time at 150 GeV
- Looks like we compensate pretty well
- Want to investigate effect on coupling, too
- Verify operation of transverse dampers
- Saw noise in dampers spectra – could cause beam growth?
- Turn off dampers and wait for studies
- Coupling may be causing dampers to work against one another
- Measure head-on beam-beam tune shifts
- Measure tunes of individual p, pbar bunches in/out of collision
- Horizontal shift agrees with expectations ~0.006
- Vertical shift smaller than expected?

- R. Moore - FNAL

- All Experimenters' Mtg - 9 Dec 02

## Pbar Maintenance/Studies

- Open up AP-1 line to look for obstruction
- Removed dangling SEM grid foil, but losses and emittance growth persist in that area
- Installed new directional couplers in core cooling
- Provide more gain to stacktail compensation
- Could allow higher stacking rates for large stacks
- Waiting to phase-in this week
- Checked 8 GeV line optics
- Verify DRF3 operations with new LLRF
- Measured Debuncher momentum aperture = 4.8%
- Debuncher admittance smaller, orbit deviation

- R. Moore - FNAL

- All Experimenters' Mtg - 9 Dec 02

## Automated Return-to-Stacking Ramp 

- Have saved > 40 mA pbars since Friday!

- R. Moore - FNAL

- All Experimenters' Mtg - 9 Dec 02

## Other Studies

- Recycler
- continued aperture scans
- Occasional no MI ramps
- Main Injector
- 27 GeV coalescing/2.5 MHz acceleration
- Slip-stacking  (see evidence of beam-loading)

- R. Moore - FNAL

- All Experimenters' Mtg - 9 Dec 02

## Weekly Schedule

- R. Moore - FNAL

- All Experimenters' Mtg - 9 Dec 02

## Summary

- Best delivered luminosity with studies: > 5 pb-1
- Suffering from emittance blow-up on Tev ramp
- Saving pbars while returning to stacking lattice
- 5 shifts of dedicated studies this week
- Likely shutdown on Tuesday 17 December

- R. Moore - FNAL

- All Experimenters' Mtg - 9 Dec 02