# Presentation: 663890

## Week in Review: 05/12/03 –05/19/03

**  ****Keith Gollwitzer – FNAL**

- Store and Operations Summary
- TEL: Beam-Beam Compensation Studies
- Standard Plots

- All Experimenters' Mtg - 19 May 03

## Stores Summary

| Store | Initial
Lum.
(E30) | Deliv’d
Lum. (nb-1) | Termination | Duration
(hr) | Comments |
| --- | --- | --- | --- | --- | --- |
| 2538 | 44.86 | 1547 | Intentional | 17.7 | 158mA Stack; End-of-Store studies |
| 2540 | 43.1 | 1545 | Intentional | 18.6 | 152mA Stack |
| 2542 | - | - | Abort | - | 152mA Stack
Quench during scraping; T:HE17 trip |
| 2546 | 40.3 | 950 | Abort | 9.7 | 143mA Stack
Quench due to T:QA42 trip |
| 2549 | 44.44 | 1578 | Intentional | 18.0 | 162mA Stack ; End-of-Store studies |
| 2551 | 43.1 | 1605 | Intentional | 18.3 | 166mA Stack |
| 2555 | 44.90 | 1590 | Intentional | 17.1 | 174mA Stack |
| 2557 | - | - | Abort | - | 174mA Stack
Quench during scraping; |
| 2562 | 30.1 |  | On Going |  | 112mA Stack
Store counts for next week |

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## High & Low Lights of the Week

- TeV
- Trips that caused quenches -- T:HE17 & T:QA42
- Minor adjustment of orbits and tunes
- Stuck collimator during scraping procedure
- Record Protons to HEP: ~**9000e9**
- Stacking
- Record protons to target (Booster & MI): **5.45e12**
- Accumulated record number pbars in **1hr**: **13.51mA**
- Tests of Beam Loading Compensation on MI ramp
- Along with MI Bunch Rotation, shortens bunch length on pbar production.
- Need to tune pbar Debuncher Bunch Rotation
- Other
- Booster Notcher timing jitter
- LRF3 Driver Tube
- SDA problems due to java machine stale cache and reboots

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## Recent studies of the TeV TEL

- Currently used for “cleaning” the Abort Gap
- Seen recent “scalloping” of emittance of pbar trains
- Tried compensation on single pbar bunch
- Note that Vladmir Shiltsev gave me a few minute tutorial and sent the following transparencies before leaving the country (he is gone to Beam-Beam03).... Imagine an excitable person with the Russian accent....

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## “DC Beam Killer” 

***Since March 2002: “24/7”***

**e-current is fired in three gaps every 7****th**** turn**

**1.2 ********s e-pulses**

**7 turns=147 ********s**

**trains of 12 p-bunches**** **

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## e-Beam Position for “cleaning”

- e-beam is being moved by a set of 6 SC dipole correctors
- each corrector can move ebeam over 23⁄4” aperture  (about 0.12Tm strength)
- _moving e-beam does not affect Tev orbits!_

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## Scallops: Emittance Blowup

-  Pbar bunches after “initiate collisions”   same  bunches 20 min later  + 5

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## Pbar Vert Emittance Growth Rate

- Scallops is beam-beam phenomena; started occurring after Nprotons exceeded 180e9/bunch
- Scallops do not take place in every store even with N_p >180e9/bunch
- Scallops occur in both planes, but often more prominent in vertical
- Scallops seem to be dependent on  tunes, e.g. vertical tune change –0.002 reduced scallops
- Small proton scallops
- Scallops are the same in all three trains of bunches (variations <20%)

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## BBC with TEL: e-Pulse on A33

**A36**

**P13**

**A32**

**A33**

**A34**

**A35**

**P16**

**P15**

**P14**

**e-current in collector, 0.6A**

**“****Integrating” BPM**

**pick-up signal**

- Store #2540
- May 12, ‘03

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## Pbar V-Sizes First 34 min of collisions

- Store #2540
- May 12, ‘03

**A33 : 1 ******** mm mrad/hr**** **
**-TEL on it**

**A21 : 2.2 ******** mm mrad/hr**** **

**A9 : 4.1 ******** mm mrad/hr**** **

- Scales
- are
- offset

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## Pbar V-Sizes first 4 hours collisions

**TEL on**

**TEL off**

- Store #2540
- May 12, ‘03

**A9 **

**A21**

**A33 -TEL on/off**

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## Pbar V-emittance growth rates

-      store		#A9		#A21		#A33
- # 2536 (40 min)	9.9		9.2		9.3
- #2538 (35 min) 	1.9		1.7		2.8
- #2540 (34 min)	4.1		2.2		1.0
- #2546	 (30 min)	3.9		1.9		4.0
- #2549 (26 min)	4.5		3.6		7.1
- #2541 (34 min)	6.7		6.6		7.0

- ( mm mrad/hr)

- TEL
- BBC

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## (Calc’d) Tuneshift vs e-position 

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## Beam-Beam Compensation:

- the first _*indication*_ of  the BBC in store #2540
- later attempts in #2546 and #2549 show that the TEL effect can be neutral or even slightly negative
- the attempts will continue
- conditions to claim  _*demonstration*__* *_ of the BBComp:
- scallops or other “bad” effects without BBComp
- reduced or eliminated “bad” beam-beam effects with the TEL on
- on systematic basis
- Areas of major improvement needed:
- e-pbar-p position measurements (TEL BPMs)
- single pbar bunch tune diagnostics (1.7GHz Schottky)

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## Best Week!!

- Quench -- T:HE17
- during scraping

**Best Week!!**

- Quench – T:QA42

- Abort – RFSUM during scraping

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## Rescaled!

**Rescaled!**

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## Integrated Luminosity & Goals

- 	Goal curves were defined in Oct 02

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## Slide 18

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03

## Summary

- The week
- 99 store hours
- Best week of Integrated Luminosity > **9 pb****-1**** **
- Record Initial Luminosity: **44.90e30 cm****-2**** s****-1**
- All 6 stores   > 40e30 cm-2 s-1 !!!!
- Stacking record of **13.51mA/hr**
- Goal for this week
- Studies week (includes some accesses)
- Want to get back to stable running

- K. Gollwitzer - FNAL

- All Experimenters' Mtg - 19 May 03