weeks in review: 05/19/03 –06/02/03

All Experimenters' Mtg - 2 Jun 03

f Weeks in Review: 05/19/03 –06/02/03

Keith Gollwitzer – FNAL

• Stores and Operations Summary• Standard Plots


K. Gollwitzer - FNAL 2

f Stores Summary

StoreInitialLum.(E30)

Deliv’dLum. (nb-1)

TerminationDuration

(hr) Comments

2562 30.1 1086 Intentional 17.7 112mA Stack; EOS studies

2581 6.25 98 Intentional 6.5 99mA Stack; Large pbar losses

2600 20.4 580 Intentional 11.4 113mA Stack; Large pbar losses

2604 34.4 1214 Intentional 17.2 106mA Stack


2608 - - Abort - 115mA Stack; Quench @ begin of ramp


2636 20.8 On Going112mA Stack

Store counts for next week



f TeV Summary

• Fixes – T:HE17 Trips that caused quenches

• Bad cable connector inside of relay rack

– Trim power supplies• LLRF filter to remove 100Hz

– Small tune changes at 980GeV stop pbars from being coherent

• Studies– 2 studies looking at injection line matching and vertical dispersion

– Lattice measurements at flat-top & low beta

– Tunes as a function of octuple and helix separation

– Confirmed that F0 lambertson is now largest impedance

– Much checkout of ramps (coupling, chromaticity…)

– BPM characterization



f Moving F0 Lambertson

Coherent

Beam Current

Lambertson Position



f Main Injector & Recycler

• MI studies – Slip Stacking– 2.5MHz acceleration– NUMI multibatch

• Recycler Accesses– RGA scans to confirm locality of contamination– Replacement of contaminated vacuum gate valve– Removal of leaking stochastic cooling tank

• Recycler studies– Vacuum as function of beam intensity– RF manipulation and longitudinal emittance growth– General recovery from access work



f NUMI Multibatch

84 Booster Bunches 9 Beam Turns 6 Booster Batches Intensity > 2E13



f Antiproton Source

• Problems– 2 Lithium Lens replacements

• Most pulses (20 months of service); transformer went bad• Installation error led to early demise of lens

– Lens water system problems (conductivity cell & valve)– Bad AP3 shunt caused bad transfers for 2 shots– Water pump broke lost stack

• Broke a dipole and 2 quad shunts

• Studies– Tunes across Accumulator aperture– Measurement of the Accumulator momentum aperture– Quad BPM study – Extraction lattice measurements– Fast stacking



f Attempt at Fast Stacking

Stack cycle from 2.4 to 2.0 sec

Stack rate remains the same

Pbar production decreases

Goal is to increase stack rateby shortening cycle time and decreasing ARF1 bucket area.

The tradeoff: leaving more pbars on injection orbit



f Proton Source & SY120

• Proton Source– LRF Tubes

• One of BNL spares delivered to FNAL

• LRF5 Rested when possible; has been replaced today

• Back to no spares

– Concern with hot areas of Booster

• SY120– Three studies periods

• Extract beam on $21 but no evidence of proton beam in P3 line

• See beam spray on P3 multiwires

• Magnet polarities checked during access

• Steering/alignment is suspect



f Narrow in P1 and P2; wide beam in P3

P1 and P2 wires

P3 wires



f Study week + shutdown week = average week?

Que

nch

– B

egin

ning

of

ram

p

Shu

tdow

n

StudiesIn

vest

igat

ion

of p

oor

pbar

eff

icie

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f Integrated Luminosity & Goals

0.0

50.0

100.0

150.0

200.0

250.0

300.0

9/30/2002 12/30/2002 3/31/2003 6/30/2003 9/29/2003

Date

Inte

gra

ted

Lu

min

osi

ty (

pb

-1)

Stretch Goal

Base Goal

Actual

Goal curves were defined in Oct 02



f Brief Summary

• Two weeks– Short accesses

– Study Shifts

– Some running and a holiday weekend

– Shutdown

– Recovery

• Goal for this week– Stack and Store

weeks in review: 05/19/03 –06/02/03

Documents