# Presentation: 680236

##  Accelerator Performance (11/18-11/24)

- Accelerator Studies Week
- Accelerator Shutdown
- MP02 power supply
- Pbar abort kicker pre-fire and quench
- Smooth weekend

- All Experimenters Meeting

- 25 November 2002

## Store Summary

| Store | Initial Luminosity | Duration | Termination | Comments |
| --- | --- | --- | --- | --- |
| 1981 | 2.77E31 | 24 hrs |  intentional | 121 mA,  lower pbar helix chrom |
| 1983 | 0.0 |  | quench | 145 mA,   lost during squeeze |
| 1991 | 2.84E31 | 3 hrs | Abort kicker pre-fire | 128 mA,   flattop coupling adj, orbits, re-parse squeeze  |
| 1993 | 2.52E31 | 15 hrs | intentional  | 103 mA,   |
| 1995 | 2.77E31 | 20.5 hrs | intentional | 120 mA,   |
| 1997 | 2.77E31 | current |   | 145 mA,   |
|  |  |  |   |   |

- All Experimenters Meeting

- 25 November 2002

## Store 1983 lost

- All Experimenters Meeting

- 25 November 2002

## Tevatron Abort kickers

- A second abort kicker pre-fire (on a different tube) in less than 2 weeks occurred last Friday during store 1991.
- The Beams Division continues to investigate means to reduce the number of pre-fires and alternate protection schemes (A48 collimator).

- All Experimenters Meeting

- 25 November 2002

## Tevatron Studies

- Measurement of pbar tunes using the TEL as a noise source
- Removal of pbars for instrumentation calibration
- Utilize Octupoles at injection to suppress Tevatron instabilities
- Tune-up squeeze

- All Experimenters Meeting

- 25 November 2002

## Issues on Luminosity

- We seem to hit a plateau in luminosity.
- The number of protons and pbars at collisions from store 1997 was slightly larger that the record store 1953 – but the luminosity was down 25%.
- Pbar vertical emittance growth at various steps continues to be an issue

- All Experimenters Meeting

- 25 November 2002

## Fast Recycler Stacking Tests

- New Method of Proton Stacking
- Works by Shrinking Batches in Time
- Uses combination of Barrier Buckets and Reversing-Ramp Waveform
- Possible Alternative to Slip Stacking for Pbar Production
- Less sensitivity to beam loading
- In principle, no longitudinal emittance growth
- Considerable flexibility in stacking scenarios
- Initial Tests MI-RR-MI (*Kiyomi Seiya et. al.* *–last Weds.*)
- Successful fast shrinking, stretching, cogging, etc.

- All Experimenters Meeting

- 25 November 2002

## Batch Shrinking Test

*Batch Shrinking Test*

**Injected**
**Batch**
**From**
**Main**
**Injector**

**Half-Length**
**Batch**
**Extracted **
**Back to**
**Main**
**Injector**

***10 msec / trace***

- All Experimenters Meeting

- 25 November 2002

## Batch Stretching 

*Batch Stretching** *

**Injected**
**Batch**
**From**
**Main**
**Injector**

**Stretched**
**Batch**

- All Experimenters Meeting

- 25 November 2002

## Fast Batch Cogging 

*Fast Batch Cogging** *

**Injected**
**Batch**
**From**
**Main**
**Injector**

**Cogged**
**Batch**

***10 msec / trace***

- All Experimenters Meeting

- 25 November 2002

## Asymmetric Batch Compression 

*Asymmetric Batch Compression** *

**Injected**
**Batch**
**From**
**Main**
**Injector**

***Needs ***
***some ***
***tuneup...***

- All Experimenters Meeting

- 25 November 2002

## Peak Luminosity

- All Experimenters Meeting

- 25 November 2002

## Integrated Luminosity for the Week

- All Experimenters Meeting

- 25 November 2002

## Integrated Luminosity

- All Experimenters Meeting

- 25 November 2002

## Schedule for the Week

- Week 11/25  (Thanksgiving week)
- Stack ‘n store
- Week 12/1
- Accelerator studies

- All Experimenters Meeting

- 25 November 2002

## Changing of the Guard

- I have enjoyed working with the staff of the Beams Division, CDF, and D0 during my tenure as Run Coordinator.
- The Next Run Coordinator ( 1 Dec – 31 Mar 03)
- 	Ron Moore (Tevatron Department, CDF)
- The Next,Next Run Coordinator (1 Apr – 31 July)
- 	Keith Gollwitzer (Pbar Source)

- All Experimenters Meeting

- 25 November 2002