# Presentation: 659456

## Run II Shot Status 19 April 2001

- Elvin Harms

## Introduction

- We’re we’ve been
- Initial 2001 performance
- Recent Areas of Emphasis
- Areas to address/need work
- Short term plans

- Run II Commissioning - 19 April 2001

## We’re we’ve been

- Commissioning run summary
- Achieved 36 X 36 collisions in the Tevatron
- Activities this year
- Resumed transfer studies on: 23 March
- Accumulator to MI only shots  ~3 days/week
- 1 week of 1 X 8’s for CDF & D0: 3-5 April

- Run II Commissioning - 19 April 2001

## Initial 2001 performance

- Accumulator to MI
- 				23 March shot 6

- Run II Commissioning - 19 April 2001

## Initial 2001 performance

- Intensity-dependent ‘transition loss’

- Run II Commissioning - 19 April 2001

## Areas of Emphasis

- Reverse proton tune up
- MI Longitudinal performance
- MI Injection oscillations
- Provide Pbars to Tevatron as needed
- Diagnostics (parasitic)

- Run II Commissioning - 19 April 2001

## Reverse Proton Tune up

- Improved (automated)  P1, P2, AP1, AP3 tune up
- Automated TBT tuning
- Multiwire & SEM grid data for comparison with Pbars

- Run II Commissioning - 19 April 2001

## Reverse Proton Tune up

- P150 application – Rev Proton Tuneup
- Record and Save P1 -> AP3 orbit
- Correct to desired reference orbit
- Both planes simultaneously
- Sequencer feel
- 10-minute tuning time to within 2mm of reference

- Run II Commissioning - 19 April 2001

## Reverse Proton Tune up

- P150 application – Rev Proton Tuneup

- Run II Commissioning - 19 April 2001

## Reverse Proton Tune up

- P140 application - VSA TBT
- Continuously sample TBT oscillations – 7 bunches
- Correct using two devices in each plane
- One pass correction to within ‘0.4mm’

- Run II Commissioning - 19 April 2001

## Reverse Proton Tune up

- P140 application - VSA TBT

- Run II Commissioning - 19 April 2001

## Reverse Proton Tune up

- 30-minute tune up

- Run II Commissioning - 19 April 2001

## Main Injector

- RPOS detector and feedback loop
- New 53 MHz bandpass filters installed in line with the RPOS detector signals. These increased the system dynamic range so we can even keep the TRONTEK amplifiers on even with protons.  The radial gain momentum curve around transition was made the same as in the other cycles.
- Transition crossing
- The chromaticity around transition was changed
- The transition time was changed by about 1.5 msec and it is now the same with the other cycles.

- Run II Commissioning - 19 April 2001

## Main Injector

- Injection matching
- The injection voltage was changed from 500 KV to 300 KV to better match the ARF1 voltage.
- The tunes were measured over the ramp with protons in $2As and adjusted for the Pbar $2As.
- Results: We observe no transition loss for Pbar intensities up to 7.5 ma.

- Run II Commissioning - 19 April 2001

## Main Injector

**Longitudinal Emittance**
- Most of the longitudinal blowup (mostly after transition ) is gone and now we measure longitudinal emittances at flattop before coalescing of around 0.35 eV-sec compared to 0.6-0.7 eV-sec before. 80% coalescing efficiency
- Coalescing efficiencies as measured by the FBIs are now up to 82% compared to about 50% before.
- Most of the RPOS intensity dependent offsets are gone. RPOS shows a constant offset of 2.5 mm for intensities from 2 ma to 7.5 ma.  Below 2 ma the offset changes to 4 mm.

- Run II Commissioning - 19 April 2001

## Main Injector

- Recent performance

- Run II Commissioning - 19 April 2001

## MI Injection Oscillations

- MI BLT – vertical mapping
- Shots 1 thru 5 varied VT701 (dI = 0, 0, +.5,+1,-.5)
- Shots 6 thru 10 varied VT703 setting VT701 to .637A (dI=+.5, +1, -5, -.2, +.2)

- VT703 mapping

- VT701 mapping

- Run II Commissioning - 19 April 2001

## MI Injection Oscillations

- MI BLT – horizontal mapping
- Points 1 thru 4 are varying HT702 (dI=0,+.5,-.5,-.2)
- Points 5 thru 8 varying HT704 (dI = +.5,+1,-.25,+.4)

- HT702 mapping

- HT704 mapping

- Run II Commissioning - 19 April 2001

## Accumulator

- Increased ARF1 voltage
- Automated VSA control
- Better handle on amount unstacked compared to requested

- Run II Commissioning - 19 April 2001

## Diagnostics

- More systems are working:
- MI BLT
- MI IPM
- Flying Wires
- AP3 SEM grids

- Run II Commissioning - 19 April 2001

## Sequencer

- Beam switch control
- States for cross-machine status
- Miscellaneous enhancements

- Run II Commissioning - 19 April 2001

## TLG/timing

- Power supply line-lock restored
- Stable TLG files for set up and shots
- Reverse proton / Pbar injection timing identical

- Run II Commissioning - 19 April 2001

## Areas that need addressing

- Accumulator longitudinal emittance
- TOR105 to MI efficiency - recently
- Acc/MI injection phase jitter
- Reduce the 8 GeV time on $2A’s
- Tevatron BLT
- NMI  front end plotting
- Reverse proton vs. Pbar positions
- SDA

- Run II Commissioning - 19 April 2001

## Short Term Plans

- Continue shots a few times per week
- To Tevatron as requested
- MI only otherwise
- Meld P150 & P140 into a single application
- Work on areas of concern

- Run II Commissioning - 19 April 2001

## Summary

- Picked up where we left off in November
- Progress in some areas
- MI Longitudinal performance
- Reverse proton tune up
- MI Pbar injection
- Set up time
- Operations assimilation
- More work to do
- Kudos

- Run II Commissioning - 19 April 2001