f all experimenters' mtg - 2 jun 03 weeks in review: 05/19/03 –06/02/03 keith gollwitzer –...
TRANSCRIPT
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
All Experimenters' Mtg - 2 Jun 03
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
2606 31.4 1062 Intentional 15.8 106mA Stack
2608 - - Abort - 115mA Stack; Quench @ begin of ramp
2614 30.0 1126 Intentional 18.6 115mA Stack
2636 20.8 On Going112mA Stack
Store counts for next week
All Experimenters' Mtg - 2 Jun 03
K. Gollwitzer - FNAL 3
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
All Experimenters' Mtg - 2 Jun 03
K. Gollwitzer - FNAL 4
f Moving F0 Lambertson
Coherent
Beam Current
Lambertson Position
All Experimenters' Mtg - 2 Jun 03
K. Gollwitzer - FNAL 5
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
All Experimenters' Mtg - 2 Jun 03
K. Gollwitzer - FNAL 6
f NUMI Multibatch
84 Booster Bunches 9 Beam Turns 6 Booster Batches Intensity > 2E13
All Experimenters' Mtg - 2 Jun 03
K. Gollwitzer - FNAL 7
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
All Experimenters' Mtg - 2 Jun 03
K. Gollwitzer - FNAL 9
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
All Experimenters' Mtg - 2 Jun 03
K. Gollwitzer - FNAL 10
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
All Experimenters' Mtg - 2 Jun 03
K. Gollwitzer - FNAL 11
f Narrow in P1 and P2; wide beam in P3
P1 and P2 wires
P3 wires
All Experimenters' Mtg - 2 Jun 03
K. Gollwitzer - FNAL 12
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
ncy
All Experimenters' Mtg - 2 Jun 03
K. Gollwitzer - FNAL 14
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
All Experimenters' Mtg - 2 Jun 03
K. Gollwitzer - FNAL 16
f Brief Summary
• Two weeks– Short accesses
– Study Shifts
– Some running and a holiday weekend
– Shutdown
– Recovery
• Goal for this week– Stack and Store