# Presentation: 004600

## Week in Review: 03/03/03-03/09/03

**  ****Ron Moore – FNAL**

- Tev Shutdown Summary
- Booster Studies & A New Record!
- Schedule for Week

- All Experimenters' Mtg - 10 Mar 03

## Tev Shutdown Summary

- Ground fault in A1 isolated to A14 spool piece
- Dipole A15-3 replaced due to bad voltage tap
- Could not be repaired in situ
- Possible ground fault waiting to happen
- Unrolled many magnets; replaced some stands
- 2 quads, 14 dipoles?
- Reduce current in corrector dipoles
- Tunnel work proceeded quickly, turn-on more slowly
- Quenched A15 at 930 GeV on first ramp attempt     (training?)
- Cooldown problems, replaced Kautky valve at A15
- Ramps to 900, 920, 930, 950, 980 GeV OK

- R. Moore - FNAL

- All Experimenters' Mtg - 10 Mar 03

## A14 spool – ground fault

- quad

- dipole

- The spool contains corrector magnets and quench bypass cables.

- Safety leads
- Fault in one of them.

- R. Moore - FNAL

- All Experimenters' Mtg - 10 Mar 03

## Magnet Rolls in A1 

- R. Moore - FNAL

- All Experimenters' Mtg - 10 Mar 03

## Recycler Status

- 77% stashing efficiency on 3/3 pbar shots
- Schottky amp failures caused by radiation damage
- MI beampipe near these amps was sagging, causing beam spray to hit amps...sag was fixed
- Two vertical correctors running too hard
- Corresponds to ~8 mm correction
- Awaiting results from survey conducted on 3/8
- Flying wire cans removed, replaced with spools
- Vacuum recovering OK

- R. Moore - FNAL

- All Experimenters' Mtg - 10 Mar 03

## Recycler Vacuum Near Flying Wires

- Before removal

- After removal

- R. Moore - FNAL

- All Experimenters' Mtg - 10 Mar 03

## Booster Studies

- Dogleg magnets thought to have bad effect on injection lattice
- MP01 septum raised 1 inch to allow 1 dogleg to be turned down/off
- Ran in this configuration for 7 shifts of studies
- No “short-batching” for other machines’ studies
- Observed tune and dispersion differences with doglegs off
- Saw 10% more beam coming out @ 7 turns     (reduced losses!)
- Allowed Booster intensity records to be set
- Booster has been restored to normal operating configuration
- Digest the data, develop scheme to run with reduced dogleg current

- R. Moore - FNAL

- All Experimenters' Mtg - 10 Mar 03

## MP01 in Booster

- For study, raised MP01 1” to allow lower dogleg current

- R. Moore - FNAL

- All Experimenters' Mtg - 10 Mar 03

## Tune Shift from Dog Leg Change

- Dog Legs Nominal

- Dog Legs down 40%

- R. Moore - FNAL

- All Experimenters' Mtg - 10 Mar 03

## Edge Effects from Dog Legs

*H Dispersion Difference:  Dog Legs at 100% and 60%*

- R. Moore - FNAL

- All Experimenters' Mtg - 10 Mar 03

## Booster Studies

- R. Moore - FNAL

- All Experimenters' Mtg - 10 Mar 03

## Record Booster/MiniBoone Operation

**MiniBoone rate**
**Protons/hr**

**Boo power loss**
**(5 min avg)   W**

**Proton Intensity**
**@ 860    E12**

**Proton Intensity**
**@ 875    E12**

**1 hour**

**5 E16**

- R. Moore - FNAL

- All Experimenters' Mtg - 10 Mar 03

## Weekly Schedule

- R. Moore - FNAL

- All Experimenters' Mtg - 10 Mar 03

## Summary

- Tev ground fault in A1 isolated to A14 spool piece
- Spool replaced, A15-3 dipole replaced, magnets unrolled
- Special Booster configuration for studies allowed new records to be set – 5.5 E16 protons in 1 hour to MiniBoone
- Gained valuable knowledge on effect of dogleg magnets
- Recycler flying wire cans removed – vacuum improved
- Once Tev has been recommissioned, “Stack & Store” for 10-14 days to integrate luminosity

- R. Moore - FNAL

- All Experimenters' Mtg - 10 Mar 03