# Presentation: 367562

## Week in Review: 02/24/03 –03/02/03

**  ****Ron Moore – FNAL**

- Store Summary / What went wrong
- Tev Studies Highlights
- Tev Ground Fault
- Shutdown + Schedule for Week

- All Experimenters' Mtg - 03 Mar 03

## Store Summary

| Store | Initial
Lumi | Deliv’d
Lumi | Termination | Comments |
| --- | --- | --- | --- | --- |
| 2271 | 23.2 | 840 | Intentional | Shot from 143 mA; ARF4 really misbehaved |
| 2285 | 13.2 | 450 | Quench | Tried ARF4 with damper (failed) 
Lost 2 pbar shots due to corrupt P1/P2 trim tables
Tev longitudinal damper in operation 
PAK3 abort kicker prefire ended store |

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03

## Frustrating Week – The Bad & The Ugly

- Two shift access for CDF tracker work
- Tev turn-on PS problems (1/2 shift)
- Initially thought to be a ground fault at feeder 23
- A3 harmonic filter battery backup system was the culprit
- Booster hot magnets/restricted LCW flow in period 18 (1 shift)
- Cleaned clogged strainers
- Occasional A:QDF glitches (quadrupole bus) (on/off over 2 days)
- Glitches would kill a stack
- Replaced electronics providing input to regulator  (garbage in  garbage out)
- Continuing ARF4 woes – damper did not solve problems
- Lost 40 mA from 140 mA stack; continued inconsistent behavior
- Already restored ARF4 cavity to pre-shutdown condition (low Z)
- Proton abort kicker (PAK3) prefired, ending store #2285
- (Another) Tevatron ground fault developed between A13-3 and A14-4

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03

## The Good

- Proton Source continued recent high performance
- 4.9-5.0 E12 ppp on pbar target,
- > 3 E16 protons/hr for MiniBoone  ( > 4E16 /hr    no stacking)
- Tevatron longitudinal dampers recommissioned
- Operational for store #2285
- Useful studies were performed, too.

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03

## Slide 5

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03

## Slide 6

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03

**stretch**

**base**

**This Tev shutdown may cause us to fall behind base goal plan.**

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03

## Tev Studies

- Coupling studies @ 150 GeV
- Kick beam horizontally in P1 line, watch betatron oscillations in vertical plane over first few turns
- Learn how to decouple better using global/local skew quad circuits
- Proton stability vs chromaticity @ 150 GeV
- Stable at lower chromaticities than before C0 lambertson removal
-   Transverse impedance now lower
- OK for single bunch, need to try with 36 bunches, use octupoles
- Could be helpful for raising proton intensities
- Chromaticity measurements via head-tail monitor
- Use stripline pickup and fast scope to look at oscillations of head and tail of coalesced protons
- Longitudinal tomography of coalesced protons
- Get CERN code working at FNAL; first look at data

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03

## Coupling Study @ 150 GeV

- Beam missteered in P1 line
- T:SQ  global skew quad circuit at 0 amps
- Look at betatron oscillations coupling between horz & vert
- Below are ~ 4 turns of data;  1st turn on left;   scale limits   4mm

- Horizontal

- Vertical

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03

## Proton Stability vs Chromaticity @ 150 GeV

- Before C0 lambertson
- removal

- After  C0 lambertson
- removal

*P. Ivanov*

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03

## Longitudinal Tomography of Protons in Tev

*A. Jansson*

- _Coalesced protons @ 150 GeV_

- Mountain range data
- @ 2 GS/sec

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03

## Recycler

- Took first pbars since shutdown
- 80% transfer efficiency
- Lifetime problems related to vacuum
- Only ~40 hours @ 30 E10 intensity
- Compare to ~150 hours prior to shutdown
- Remove flying wire cans installed in shutdown
- Source of vacuum problems?

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03

## Tevatron Ground Fault

- Store #2285 ended with PAK3 abort kicker prefire
- Fault found during hipot prior to access to fix weeping Kautzky valve @ B11
- Recent Tev hipots have been very good, so this is new
- “Soft” ground fault (~8k to ground) isolated between A13-3 and A14-4  (6 dipoles, 1 quad, + interfaces, etc.)
- Need to warm up to help diagnosis, replace component
- Warm up complete Tuesday afternoon

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03

## Shutdown Tasks

- Warm up Tev A1; find/repair ground fault
- Replace magnets stands, unroll quads in A1?
- Priority list being generated; 7-8 candidates
- Remove Recycler flying wire cans, bake out
- No access to Pbar rings
- Move septum in Booster to test running without using dogleg magnets
- Doglegs thought to be source of lattice problems
- Restore septum to original position on Thursday
- Numerous other maintenance tasks...

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03

## Slide 15

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03

## Summary

- Only 2 HEP stores this week
- Lots of downtime: Booster, Pbar, Tevatron
- Shutdown to warm up Tev to find A1 ground fault
- Will access other machines, too, during this time
- Turn-on MI Thursday evening
- Resume MiniBoone, pbar operations
- Tev cold sometime Sunday, Mar 9

- R. Moore - FNAL

- All Experimenters' Mtg - 03 Mar 03