Thursday June 1
The day shift began Operations
with preparing the Antiproton
Source (Pbar) and the Tevatron (TeV)
for access.
NuMI was issued a beam permit at 8:44 AM.
Experts put the TeV through a dry squeeze at 12:48 PM.
The Collider Detector at Fermilab (CDF) reported at 12:58 PM that they
were ready for beam.
Operations reported at 3:20 PM the following machine status:
- Linac is running normally
- Booster is doing studies
- Pbar is doing studies
- Recycler is doing studies
- TeV is attempting to inject beam
- NuMI is attempting to run some beam
- Main Injector (MI) is looking at beam in support of TeV and NuMI
- Switchyard F1, F2, and F3 enclosures have been secured
At 4:05 PM, the TeV suffered a quench at sector F1. Experts investigated.
Operations reported that NuMI successfully took beam all the way to
their target at 4:12 PM.
Experts put the TeV through another dry squeeze at 6:23 PM.
NuMI resolved some problems and resumed target scans at 6:46 PM.
Operations reported at 7:08 PM a phase unbalance problem with a Debuncher
quadrupole (D:Q731). A power supply expert came in and had it up and
running an hour later.
Booster experts ended their studies around 7:30 PM.
Experts established beam in the Tevatron at 7:47 PM.
Pbar experts established beam to the target at 7:50 PM.
NuMI experts completed their target scans at 9:10 PM. They began a tuning
and study period.
At 10:45 PM, the TeV aborted at sector D0 due to beam positions. There
was no quench.
Pbar reported at 11:56 PM that they saw beam in AP2.
Friday June 2
The day shift began with Pbar conducting stacking studies, with the
TeV trying to circulate beam, and with NuMI taking beam.
Operations reported at 4:59 AM that Pbar experts hadn’t been able
to get beam to the Debuncher. Investigators discovered that a kicker
(D:IKIK) power supply’s power cable had been disconnected. This
will be further investigated during the day.
TeV experts established circulating beam at 6:50 AM.
Switchyard safety system tests were completed by 8 AM.
The Plans for Today and the Weekend
The plan is to continue commissioning.
Machine Reports
Linac
Beam Specifications
- Running on H- Source
- Beam Current ~ 34 mA
- Loss Sum Average [< 20]
Downtime
- 99.5 % Availability
- .85 Hours w/ 5 Occurrences
Major Downtime
- 0.5 Hours à Klystron Debuncher water system trip
NTF Plans for Next Week
- Patient treatment on Monday, Tuesday and Wednesday.
Studies
- Move Collimator into Beam Line
Booster
Experts continue to tune, balance the RF, and to improve the efficiency.
Next week they need to adjust the energy and conduct a single wire scan;
both of these items will be destructive to the beam. They also need to
work on the following things: the orbit between periods 2 and 4, RF issues
through transition, and to take IPM data.
Main Injector
MI is supplying beam to the TeV, NuMI, and to Pbar.
MI.
- Tune up for operation as requested
- Establish 150 GeV orbit.
- Establish 120 GeV beam to NuMI, and Pbar.
- New BPM at 40
- The closed orbit mode problem was fixed.
MI8 Line
- Texas profile monitors, mw826, 827, 829, & 836.
- Fixed motion control polarity.
- Fixed mw826 problem of not staying in.
- Multiwire chambers mw839, 840, & 851.
- No signal right from start-up.
- Lattice study
Multi-wire profiles from 826 to 852 (at 1.2e12)
MI8 line dispersion function
Next Week
Linux program commissioning
BPM
- Complete certification of new MI 40 BPM house.
Studies
- MI 8-GeV lattice measurement
- Aperture scans
- Tune harmonic quads at 8-GeV
- MI8 line Collimator
- Certify loss monitors, thermo-couples, and data logging.
- Effect of MPØ3 on beam to MI
- Use VT805: 3 bump to test for any sign of impact.
Antiproton Source
Experts established 120 GeV beam to the target and conducted target
scans. They have an injection kicker power problem. They are tuning with
reverse protons. Experts hope to be stacking by Tuesday or Wednesday,
6/6/06 or 6/7/06.
Antiproton Source Startup Report
- DVM electronic logbook titles evolved from “sad, sad story” to “fun & games”
- Got reverse protons to Accumulator & Debuncher by Saturday
- Many little trim power supply cable swaps, etc.
- A power supply expert changed out D:IB contactor
- Repercussions of kicker 165 ® 465 ramp card swaps
- Accumulator aperture work. Running wave correctly identified several
limiting apertures, e.g. tank 301 moved during leak fix
- Acceptances comparable to February, except Deb V, Acc Inj V
- Prototype tank backwards; got data Thurs; swap arrays Friday
- Aim to remove tank (regain full Deb V acceptance) on Monday
- Got 120 GeV beam to target, some secondaries to end of AP2, by Thursday
night
TeV
Many little problems delayed establishing beam in the TeV.
Tevatron Status
- Looked for main bus ground fault. Did not isolate it and at times
it has gone away.
- Repaired, baked, and conducted a small amount of conditioning of
the B11 separator due to vacuum leak.
- E11 flying wire was found to be bad & required pulling the internal
can for repair.
- Started running beam on Thursday and established the first turn on
evening shift.
- Established circulating beam at 0700 this morning.
Problems Establishing Beam
- There is a new transductor for the main bus that is different by
3.4 amps at 150gev and 22 amps at 980gev. This may mean that the program
current is not in step with the low beta quad program. We are thinking
about this.
- Required significant P1 tuning to establish beam.
Recycler
Experts are ready for antiprotons.
Emittance Growth
Orbit Corrections
- Reversed polarity of R:H90C
- Corrected orbit to very close to what we had in Feb. before moving
magnets.
- Bulk supply failure caused by powering skew quads
- Excellent lifetime
- First look at MI stray field compensation says same as Feb.
- Vert. slope on 30 straight needs work
Transfer Lines
- Protons through both transfer lines.
- Once MI orbit corrected, both transfer lines appear unchanged from
Feb.
- Vacuum fixed
- Still need to make multiwires & BPMs work.
- Closure programs work.
Acceptance
- Worked on understanding how to make acceptance measurement.
- Injection acceptance was less than circulating acceptance because
of counter waves. Reducing the counter wave fixed this.
- We now believe acceptance is comparable to best we’ve ever
seen.
Instrumentation
- Ring BPMs fine, transfer line BPMs need check out.
- Schottky & VSA was fine, except we need a time-sampled measurement
to see the MI effect on tune.
- H flying wire had a reference problem, but that’s now fixed.
The V flying wire is fine.
- Transfer line multiwires need check out
Lattice Function
- An expert tried to get lattice function measurements but program
didn’t read BPMs reliably. This is being worked on and will need
future beam time.
Operating Tunes
- Started up at h = .414, v = .418
- Corrected skew quads to get min. tune split of .0014
- Increasing vertical tune reduces lifetime at and above .424 until
above about .438
- Lifetime still not great, improved by h = .436, v = .444
- More studies needed.
Chromaticity and Sextupoles
- Need beam measurements to document
Stochastic Cooling
- The preliminary check out is okay, but we need antiprotons for a
full system check.
Switchyard 120
The P3 line turn on was delayed by power supply problems.
Meson Test
- P3 dipole replaced
- P3 dipole LCW leak repaired in place
- New A0 quad staged
- Interlock testing today through Meson primary
- Run power supplies over weekend
- MTest interlocks next week
- Beam next week if possible
MiniBooNE
Experts are ready for beam. (Booster will begin delivering low intensity
beam to MiniBooNE, possibly as soon as this afternoon.)
NuMI
They hit their target with the first pulse of beam. However, they still
have a lot of little problems that need fixing.
Collider Detector at Fermilab
CDF experts ran DAQ and trigger testing.
D-Zero
Experts are investigating a noise problem that is possibly from their
muon system. They also exercised their DAQ system.
Accelerator Update
Archive
More Information
For Tevatron luminosity charts and the current status of Fermilab's accelerators
and detectors (live!), please go to Fermilab
Now.
Comments and Suggestions
What do you think about the Accelerator Updates? Please send comments
and suggestions to: accelupdates@fnal.gov.
|
