# Presentation: 219019

## AP2 Line & Debuncher Studies Status        

- Keith Gollwitzer
- Antiproton Source
- January 9, 2006
- Many people involved with providing the hardware and software that was commissioned as well as performing the beam studies

- Gollwitzer -- Jan 9, 2006

## Story Starts Seven Weeks Ago...

- McGinnis at the All Experimenters’ Meeting was describing a two week block of pbar studies
- TeVatron breaks
- Scramble to find people for Thanksgiving weekend studies
- Finished preparatory studies
- Started on the designed study plan
- Owl shifts: started studies for the Debuncher to Accumulator (D/A) transfers

- Gollwitzer -- Jan 9, 2006

## One of the several preparatory items that was done before Thanksgiving

- Attempt to remove RF cavities effect on reverse proton injection

- Gollwitzer -- Jan 9, 2006

## Statistics

- Length of Time:          **Tue Nov 22 to Thu Dec 15**
- Number of Elog shift pages:                               **72**
- Number of Recorded Debuncher Orbits:          **857**
- Number of Recorded AP2 Orbits:                     **775**
- Number of Commissioned items:                       **11**
- Number of Major Accomplishments:         **6+****1⁄2 ****+****1⁄2**
- Number of Confusions (at the time):                   ****
- Number of Other Things Done:                        **6+1**
- Number of “Next Times” Known Items:                **9**

- Gollwitzer -- Jan 9, 2006

## Commissioned Items

- Debuncher Reverse Proton Turn-By-Turn system
- Debuncher Reverse Proton partial turn extraction up AP2
- Debuncher Component Centering
- Debuncher Orbit-Quad offset
- AP2 Orbit-Quad offset
- AP2 Beam Line Correction
- One-Shot Time-line for acquiring Debuncher beam
- Admittance measurement from data-logger
- “Deb Heat Rev p’s to AP2” aggregate
- AP2-Debuncher Injection region setup
- Auto-tune 120 GeV orbit of P1-P2-AP1

- Gollwitzer -- Jan 9, 2006

## Scheduled Studies Accomplishments

- Lattice measurements for Debuncher and AP2
- Determine Debuncher Orbit/BPM-Quad offsets
- Corrected Debuncher Vertical Orbit to Quad Centers
- Centered Debuncher Components about orbit
- Determine AP2 Orbit/BPM-Quad offsets
- Set Orbit, Stands and Settings for AP2-Debuncher Injection Region
- Corrected AP2 Orbit to near Quad Centers
- Installed AP2 lattice that matches to current Debuncher Lattice

- Items **1⁄2**** **completed

- Gollwitzer -- Jan 9, 2006

## Change in Debuncher Vertical Orbit

- Determined Orbit-Quad center offsets
- Steered to center of quads
- Center components about orbit using motorized stands

- Gollwitzer -- Jan 9, 2006

## Change in AP2 Stacking Orbit

- Gollwitzer -- Jan 9, 2006

## AP1

**Top - November BPM Positions – NO orbit correction &  drifting**

- Horiz.              AP2             Vert

- H

- H

- V

- V

- 5mm

- 10mm

- 10mm

- 3hr

- Gollwitzer -- Jan 9, 2006

## Stacking Rate is Better

- Compiled by P.Derwent

- Best stacking hour for each day
- 	Average stacking rate per
- 	stacking cycle (includes
- 	effects of complex downtime)

- Stacking record
- 17.46mA/hr
- (Dec 29, 2005)

- Gollwitzer -- Jan 9, 2006

## Weekly Statistics

- From E. Harms

- 2001

- 2006

- Studies Period

- Increased
- by ~15%

- Gollwitzer -- Jan 9, 2006

## Other Items Done

- Replaced failed Li Lens
- Installed Collimator in Target Station
- Survey of AP2-Debuncher Injection Region
- Commissioned Ramped Devices in AP1
- D/A Beam Based Alignment
- Accumulator aperture: Injection channel & orbit
- Stacking tune-up

- Gollwitzer -- Jan 9, 2006

## Next Steps 

- Investigate AP2 lattice
- Correct Debuncher Horizontal Orbit
- Center Debuncher Components
- Install new Debuncher Lattice
- Install matched AP2 Lattice
- Remove Lens Steering
- Steer AP2 on apertures
- D/A Orbit
- Accumulator Orbit and Aperture

- Gollwitzer -- Jan 9, 2006

## New Shutdown Items

- Identified Debuncher limiting aperture to be the Transverse Schottky’s
- New larger aperture pickups to be installed
- Identified the need for four dipole trims in the AP2 beam line
- Two vertical trims to set position and angle going into the AP2 bend
- One trim in each plane to set position and angle prior to AP2 downward bend to Debuncher

- Gollwitzer -- Jan 9, 2006

## Summary-1

- AP2
- Defined a better orbit based on quad centers
- Installed matched lattice to Debuncher
- Identified vertical scraping in main AP2 bend region
- Set Injection Region orbit and motorized stand positions
- Need to work on
- Center orbit vertically in main AP2 bend region
- Upstream orbit
- Lattice
- Debuncher
- Defined the vertical orbit based on quad centers
- Centered components on motorized stands about orbit
- Identified next limiting aperture to be transverse Schottkys
- Need to work on
- Center orbit horizontally on quad centers
- Center components on motorized stands about orbit
- Lattice work to help beam size in tight apertures
- Antiproton Accumulation has increased by 15%

- Gollwitzer -- Jan 9, 2006

## Summary-2

- D/A and Accumulator Injection Orbit
- Next stacking limitation
- D/A orbit needs to be centered in quads
- Measured Accumulator admittances are <75% of what were measured at the beginning of Run II
- Lessons Learned from 3 Weeks of Studies
- Configuration control
- Focus
- Feedback of the effect of any one change on performance
- Applying the Lessons Learned
- Break into 1 to 2 day study periods
- Will request 3 or 4 such periods before the long shutdown

- Gollwitzer -- Jan 9, 2006