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Day
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Short summary
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Link to report from 8:30 meeting
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Monday 7th December
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Since 00:30: Beam off.
a) Loss of cryo maintain in sector 81 led to dump
of stable beams.
b) Electrical perturbation at 04:25 during recovery. Loss of warm compressor
in IR4. Magnet trips. Other effects on machine elements.
c) Recovery at around 24:00.
d) Stabel beams as of 2am 4x4 pilots of 6-7e9 but
with beam in wrong buckets.
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8:30 Summary pptx
for December 7
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Tuesday 8th December
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End of fill around 07:30 after analyzing
the issues related to wrong bucket numbers.
11:15:
Starting one hour fill with LHCb spectrometer
OFF. 4 x 4e9 per beam.
11:30:
Fill aborted due to QPS trigger in Sector 12. Abandon LHCb
run and reschedule it for evening or night.
Miscelleanous activities done in parallel:
1. RF phase adjustment for collision point. (Done by 11am)
2. Transverde damper noise checks.
(Done at )
3. Test of synchrotron light monitor.
14:30:
Pre cycle finished and LHCb spectrometer dipole on
again. Problems with RF phasing.
15:00:
Setup for higher intensity: 1 pilots, later n times 2e10
1. Beam position interlock commissioning.
2. Dump with beam offset to limit on position interlock (bunched
& unbunched).
3. Injection protection setup.
4. Abort gap keeper setup (--> requires an access to 2,8 and 6 later in the week).
5. Review injection sequences.
6. Collimation check (Q to 1/3 resonance).
7. Collimation check off-m (fRF trim).
8. Machine Interlock Test with beam (Ghislain)
19:00:
Test with synchrotron light monitor?
19:30:
Ramp tests: 2 x 4e9 per beam.
00:00:
Starting one hour fill with LHCb spectrometer
OFF. 4 x 4e9 per beam.
At end of fill testing of transverese IP steering
in IP5.
LHCb run NOT delivered due to nQPS
problems in S12. Night spend in trying to establish again circulating beams
after end of last ramp.
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8:30 Summary pptx
for December 8
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Wednesday 9th December
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10:00:
Finally managed to establish
circulating beams (problem traced to wrong injection settings in triplet
orbit correctors in IR2).
Starting one hour fill with LHCb spectrometer
OFF. 4 x 4e9 per beam.
At end of fill testing of transverese IP steering
in IP5.
Run ended at 11:00 due to lifetime problems in Beam2. CMS could not yet
benefit from IP scan but knobs worked fine from machine point of view
LHCb dipole on again.
12:00:
Preparing Access:
-Point 2, 8 and 6 for LBDS
-Point 4 for RF and BI (undulator)
-Point 5 for TOTEM
-Point 3 for exchange of PRS module
in electronics rack for collimator
17:00:
Continue beam setup for higher
intensities. Other miscilleneous work:
-Ramp up of undulator
to 400 A in 50 A steps
-Tune feedback for Beam1
20:00
ATLAS magnets ramp up (solenoid
& toroid)
22:00:
Stable beam collisions at 450 GeV with 4 x 4 4e9.
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8:30 Summary ppt for
December 9
LMC Summary pptx for December 9
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Thursday 10th December
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9:00:
Test IP transverse adjustment (CMS)
and optics verification.
First commissioning of Synchrotron
light monitor (mirror adjustments) -> light for Beam2 now available!
10:00:
Continue beam setup for higher
intensities (TCSG/TCDQ Beam1; Transfer line collimators
and TCDIs Beam2; abort gap keeper
both beams) -> working on TCDI's Beam1.
Done in parallel:
-Analysis for
losses at MQXA in IR8 during overinjection ->
TDI
-Tune feedback
commissioned for Beam1!
-Injection
oscillation correction for Beam1
-RF phase loop studies
-Dump test with new
('abort gap keeper' compatible) filling scheme
-Lifetime optimization for Beam2 by swapping horizontal
and vertical tunes
(avoiding 8kHz excitation near vertical tune)
Suffered a lot from late
injection permit from ATLAS after post mortem trigger (ca. 10min to 20min)
-> loss of more than an hour in setup time.
19:45:
Injection test with higher bunch
intensity (single bunch).
Optics measurements - verification.
20:30:
Collimator setup verification with
higher intensities (e.g. 2 10^10 / bunch).
Still to come: unsynchronous
dump with unbunched beam.
01:30:
Stable beam collisions at 450 GeV with high bunch intensities: 4 x 2 10^10 per beam<>
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8:30 Summary pptx
for December 10
17:00 CMS presentation on Vernier Scans ppt
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Friday 11th December
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Morning:
9:00: Transverse IP
adjustments in LHCb
10:30: Lost beam (trigger was ATLAS det according to PM on line)
and struggled to get injection permit after ALICE specrtrometer
was powered up
11:20: problem due to the
interlocked BPM giving a interlock after the recalibration of BPM
12:30: MKI.B1 generator fault and
Beam 1 erratic dump -> inject Beam2 and perform Q' measurements
14:30: Both beams back ->
continue chromaticity measurements in Beam1; swaping
tunes for Beam1
Lifetime increases from 1h to 5h but difficult to measure horizontal tune:
many lines in spectrum!
15:00: Trip in MQTL11.L3B2 ->
same as yesterday night; caused by faulty current reading (DCCT)
Faulty signal disconnected -> 16:00 finished pre-cycle for MQTL
16:30: Beams back in machine and
start RF studies (1 hour)
19:00: Start transverse IP
adjustments in ATLAS, ALICE, CMS (LHCb done in the
morning)
21:30: Done with IP adjustements. Use end of fill to measure and adjust chromaticities:
Old settings from IP adjustment:
Beam1: Qx = .302; Qy =
.272; Qx' = 25.4; Qy' =
7.6; coupling = 0.002; Lifetime 3 h
Beam2: Qx = .291; Qy =
.274; Qx' = 11; Qy' =
10.9; coupling = 0.004; Lifetime 1 h
New settings after correction:
Beam1: delta Qx' = -14; delta Qy'
= 0
Beam2: delta Qx' = -5; delta Qy'
= -5
Beam1: Qx = .302; Qy =
.272; Qx' = 11; Qy'
= 6.6; coupling = 0.002; Lifetime 25 h
Beam2: Qx = .299; Qy =
.273; Qx' = 4.3; Qy' =
5.5; coupling = 0.004; Lifetime 20 h
00:00: preparing new luminosity fill
but lost cryo in sector 81 due to falty temperature reading for RSS
01:30: Beam back
06:30: Lost beam due to PC and QPS
system
09:00: Preparing new fill
Rest of the day:
Continue stable beam collisions at
450 GeV with high bunch intensities: 4 x 2 10^10
per beam
Request for acess
/ time without beam:
-Bernd Dehning
to exchange a card for the BLMs (ca. 1 hour)
-ALICE needs one hour of access for
fixing TPC crate (ca. 1 hour - compatible with pre-cycle).
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8:30 Summary pptx
for December 11
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Saturday 12th December
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Continue stable beam collisions
at 450 GeV with high bunch intensities: 4 x 2 10^10
per beam
-Fill at 9am -> 4 hour fill with
Beam2 lifetime = 5 hours (Beam1 lifetime = 25 hours)
-Fill at 2pm -> 5 hour fill with
Beam2 lifetime = 5 hours (Beam1 lifetime = 25 hours)
-Fill at 8pm -> 2 hour fill with
Beam2 lifetime = 12 hours (Beam1 lifetime = 15 hours) Lost fill due to cryo
Studies in parallel:
-Transverse IP adjustments in CMS, LHCb and ALICE
-wire scanners during 'stable beam'
mode
-tune adjustments for Beam2
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9:00 Summary pptx for December 12
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Sunday 13th December
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7:00: Recovering from Cryo -> problems related
to QPS
-> requires access
18:30: Finished pre-cycle and setting up for beam injection (ca. 20 hours
after compressor fault yesterday night).
19:00: Starting Q and Q' adjustements
20:30: Ready for injection but lost cryo due to
faulty temperature reading. Need to re-cycle again -> 1.5 hours
22:10: Ready for injection and working on tune and chromaticity adjustments
22:40: start ramp
22:45: lost Beam2 at 800 GeV triggered by BPM
interlock but perform measurements on Beam1 at 1.18 TeV
23:30: dump beam and prepare second ramp
02:40: start second ramp: both beams reach 1.18 TeV
with goo lifetimes.
04:00: declaring quiet beams for 2 hours
06:00: Dump both beams
Rest of the night: Stable beam with 4 bunches of 2 10^10 per beam.
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9:00 Summary pptx
for December 13
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Monday 14nd December
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Planned machine studies for the next days:
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-High intensity at 450 GeV (16 * 5 10^10 per beam)
separation
bumps during injection
RF
adjustments
-Ramp test - pilot collision
-abort gap cleaning
-squeeze and beta* knob tests at 450 GeV (2 hours)
Miscelleneous:
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-Orbit bumps at synchrotron light monitor (end of fill)
-intermediate energy dump tests
-TOTEM Roman pot adjustments (end of last Physics fill)
-Detailed
check of injection losses on TCDIs and TDI/MQXA, 4 h (anytime late Sunday
onwards).
-Injection matching studies, 2-4 h. Lower priority, but if some time spare
would like to take some data on injection matching and emittance
blowup, to at least start using the techniques
we'll have to have working next year.
-Finish up Polarity checks
-Finish up Kick response
measurements
-orbit feedback commissioning
-nQPS
quench threshold test with beam (< 2e9)
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8:30 Summary pptx
for December 14
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