# Presentation: 419802

## Week in Review: 07/28/03 –08/03/03

**  ****Doug Moehs – FNAL**

- Stores and Operations Summary
- Standard Plots

- All Experimenters' Mtg - Aug. 04, 2003

## Stores Summary

| Store | Initial
Lum.
(E30) | Deliv’d
Lum. (nb-1) | Termination | Time
(hr) | Stack
Size
(mA) | Comments |
| --- | --- | --- | --- | --- | --- | --- |
| 2826 | 37.20 | 1443 | Intentional | 21 | 164 | Fewer protons out of source |
| 2828 | 37.24 | 1514 | Intentional  | 21.5 | 194 | Some Pbars lost up the ramp
emittances somewhat larger |
| 2830 | 35.14 | 616  | Abort | 9.1 | 166 | RF Abort |
| 2839 | - | - | Quench | - | 144 | Lost shot at the beginning of the ramp, 465 card replaced  |
| 2847 | 34.83 | 1277 | Intentional | 20.0 | 143 |  |
| 2852 | - | - | Quench | - | 217/
155 |  60 Hz ripple on TEV RF anode supply’s  3 phase current monitor |
| 2857 | 32.04 | 844 |  Intentional | 18 | 119 | High Proton Losses |

- Doug Moehs (Matthew 14:28-34)

- All Experimenters' Mtg - Aug. 04, 2003

**Notes:**
2830  Tev RF Abort, coincedence with fire alarm, cause unknown.
Pbar problem:  PLC Programable Logic Controler:  Lost control of transverse system feedback which lead to emittance blow up. Lost the remnat Pbars after the shot, about 20 MA.  This required an access into the tunnel to fix. 

2839  Quench A1 at the beginning of the ramp.  465 card replaced 2.

13.8 KV three phase current monitor:  Trip level raised by a factor of 2.

## Integrated Luminosity for the Week

**Integrated Luminosity for the Week**

-  Access to repair The TEL

- Recyler Studies

- Kautzky Valve and vacuum

- PLC, Pbar access

- D0 Experiment Access

- 2826

- TeV Studies

- 2828

- 2830

- Quench Recovery

- 2847

- 2857

- A1 Quench, lost  store

- Abort: RF

- Doug Moehs (Matthew 14:28-34)

- All Experimenters' Mtg - Aug. 04, 2003

**Notes:**
E2 Quench Recovery

Kautzky Valve (cryo valve, required Tev access.  Vacuum leak, pumps added)

## Troubles

- Access into the:
- Tevetron
- Kautzky valve replacement and vaccuum work
- Electron Lens tube replacement
- Pbar
- Lost Remnant stack, 20 mA, following shot to TeV.
- Programmable Logic Controller repairs
- Heat load on E2 fridge
- Leaky Kautsky valve
- Bad cryo vacuum
-  QB15 ramped improperly due to a bad 465 card
- The card had to be replace twice
- Caused quench at A1
- Flying wire intercepting beam in Linac 400 MeV line
- Beam falling out of booster, causing MiniBooNE trips.

- Doug Moehs (Matthew 14:28-34)

- All Experimenters' Mtg - Aug. 04, 2003

**Notes:**
PLC Programable Logic Controler:  Lost control of transverse system feedback which lead to emittance blow up. Lost the remnat Pbars after the shot, about 20 MA.  This required an access into the tunnel to fix. 

## TeV Studies and Changes

- Continuation of orbit smoothing between stores.
- Orbit and Tune measurements up the ramp, uncoalesced beam on the central orbit
- Chromaticity and Tune measurements at 980 GeV, through the squeeze
- Preparation of a new helix using more separators up the ramp.
- Increase lifetime, reduce beam-beam effects
- The helix is ready for a 36x4 commissioning store
- Lattice measurements at 150 GeV (next study)

- Doug Moehs (Matthew 14:28-34)

- All Experimenters' Mtg - Aug. 04, 2003

**Notes:**
Tev injection energy is 150 Gev so this is a small change.

## Other Studies

- Recycler
- longitudinal and transverse emittance studies
- Average beam energy measurements.
- Admittance measurements
- These studies were made while there were no MI ramps
- Slip stacking
- Capture efficiency
- Accelerating beam
- NUMI multibatch
- 2.5MHz acceleration
- SY120 commissioning
- Beam to MT6
- 38 GeV pions and 120 GeV protons
- 8GeV reverse proton lattice measurements
- Corrections implemented
- MI8 beam line lattice measurements

- Doug Moehs (Matthew 14:28-34)

- All Experimenters' Mtg - Aug. 04, 2003

## Slide 7

- Doug Moehs (Matthew 14:28-34)

- All Experimenters' Mtg - Aug. 04, 2003

## Slide 8

- Doug Moehs (Matthew 14:28-34)

- All Experimenters' Mtg - Aug. 04, 2003

## Luminosity Strategy 

- Keep the large number of particles to low beta
- Most of the time proton source is running well including high coalescing efficiencies
- Objective 240 protons per bunch to low beta
- Larger stacks associated with longer stores
- Objective shoot from 170 mA stacks
- Now trying to decrease the effective emittance of the beam
- TeV injection matching (between store studies will be needed)
- Refining Accumulator to MI pbar transfers
- Goal is still 225pb-1 ASAP
- TeV study philosophy is to concentrate on a few studies in order to maximize the available study time
- Once this goal is achieved will incorporate some dedicated beam studies, approximately

- Doug Moehs (Matthew 14:28-34)

- All Experimenters' Mtg - Aug. 04, 2003

## Brief Summary

- The week
- All average initial luminosities > 32e30cm-2s-1
- 76 store hours
- FY03 total is 208.8 pb-1; 3 weeks to Aug 25
- Need 5.4 pb-1/week, down from 5.6pb-1 last week
- Goal for this week
- Stack and Store
- Commission new helix

- Doug Moehs (Matthew 14:28-34)

- All Experimenters' Mtg - Aug. 04, 2003