1. Planning for the week MO M P
BCTFR, BPM setup (phases) with pilot intensity
B1/B2, pilot 3 OK
IR8 - injection region aperture
B2 pilot 2
RF commissioning (loops, ...) 6
Two beams in LHC, parts 1 2 and 3 A 4
Collimation setting-up & protection GeV
B1, pilot 1
Trial ramp N 8
Started
Aperture measurements B1 TU MA
ACCESS (previewed 9-16) from 9-22
no beam
Recover (mostly QPS issues) and precycle WE 12
Recover (cryo problem 07 to 19) and precycles
Restart after 2 days off - beam for 3 hours - PS vacuum TH
Access in shadow of PS recovery
setting-up beam 1, re-visit beam 2
OP/BI - energy matching/ capture/BPM PM
First look at PLL then cryo problem 02-24 FR
Access
Recover
Kick-response SA
Initial commissioning of beam dumping system, beam 1 and 2
B1/B2
Key beam parameters revisited - beam 1 & 2, beam size etc. measure & correct tune, chromacity, coupling both beams
ABP measurements SU
Protection devices and collimator setting-up - b2/b1
MPS tests: FMCM, time delays
Trial ramps
KICK RESPONSE
Solenoids/coupling compensation
pilot, b1
MPS: BLM thresholds - check plus thresholds and checks on beam dump BLMs
B1/B2 pilots
pilot, B2
2/17/2019

2. Plan for Monday Injection region studies point 8 RF on beam 2
2 beams in the machine
Collimator set up
Test ramp
Overnight
Aperture measurements
2/17/2019

3. Monday Monday morning 7-10 Morning 10-12
Beam 2 to point 7 for injection region aperture measurements
“Problem seems to be solved”
Morning 10-12
RF work (phase loop closed), lifetime up to ~10h
BI work in parallel
Status both beams at midday Monday
Lots of successful BI system commissioning
RF capture and phase loop on
Orbit, Q, Q’, coupling measured and corrected to first order
Lifetimes ~10h
Dispersion remarkably good
Beta beating measured
Kick response almost done for beam 1
Beam commissioning meeting Tuesday afternoon
2/17/2019

4. Aperture point 8
2/17/2019

5. Monday
From 12.00
Beam 1 injected. Lifetime of order 1 hour. Orbit corrected.
13.20 Inject again B1. Inject B2. Both in bucket 1.
Both beams circulating in LHC. Hands off by OP for half an hour.
Adjustments based on BPMs through 1 and 5.
Less easy in IR5 – could only move 1 beam – then lost 50% of 1 beam
Hands off by OP for half an hour
From 16.00
Beam 2 checks with beam dump at bucket 8911 and 26701
Then 2 beams in LHC at buckets 1 and 8911
Quiet beams for ALICE
Then 2 beams in LHC at buckets 1 and 26701
Quiet beams for LHCb
From 19.00
Beam 2 back in bucket 1
2 beams in for collimation set up
Quickly steer IR5 (with new knob) and IR1
Quiet beams for 15’ for CMS and ATLAS
2/17/2019

6. 2 beams in the machine
2/17/2019

7. 2 beams in the machine
2/17/2019

8. 2 beams in the machine
2/17/2019

9. Steering position with BPMs – IR1
2/17/2019

10. Steering position with BPMs – IR5
2/17/2019

11. Steering position with BPMs – IR2
2/17/2019

12. Steering position with BPMs – IR8
2/17/2019

13. Steering position with BPMs – IR5 revisited
2/17/2019

14. ALICE
2/17/2019

15. ATLAS
2/17/2019

16. CMS
2/17/2019

17. LHCb
2/17/2019

18. Monday Then difficulties to re-establish conditions
From to collimator set up
Dump debunched beam
All losses on TCDS and TCDQ
First test ramp just after midnight
Beam 1
Beam to 540 GeV
Losses at start
Then stable
Then losses (3rd order)
Then difficulties to re-establish conditions
Finally started aperture measurements around 04.00
Stopped at 06.00, pre-cycle, S12 problems still …
Prepare for access
2/17/2019

19. Tunes during the ramp
2/17/2019

20. Orbit drift during ramp
2/17/2019

21.  No unexpected losses in arcs, experimental insertions, …
First Multi-Stage Betatron and Momentum Cleaning after First Partial Collimation Setup
(20% of collimators set-up: 5.7s ++, rest in coarse position, first energy ramp )
IR7 betatron cleaning
(betatron halo losses)
Beam 1
IR3 momentum cleaning
(uncaptured beam)
factor 1000
eff > 99%
IR6 dump protection
 No unexpected losses in arcs, experimental insertions, …

22. Tuesday/Wednesday Pre-cycle machine
Access in LHC from 9 to 16 (became 22)
Machine wide changes to nQPS on 600A
Plenty of other things
Radiation survey in the injectors 14-18
Difficult recovery through the night
S12 cycle of Bends and Quads cycle failed around 22.00
Various problems to restart elsewhere in the machine
Precycling wherever possible
notably sector 12 (new QPS) for the first time
Cryo problem S12 at Wednesday. Access needed
Exchange PLC
Good cryogenic conditions 19.00
Sorting out (last of) QPS issues through morning / afternoon
Ready for injection 22.00
Started with beam 2 very late Wednesday
Revisiting Q, Q’
PS vacuum leak around 02.00
2/17/2019

23. Thursday PS vacuum leak around 02.00 Beam available again 16.00
More access in LHC, then cycling OK
Beam available again 16.00
Beam 2 injected around 17.00
Problems to circulate Beam 1
With RF off
Losses at TCDQ
Put to parking position (which is nearer beam than it was)
Losses now in IR3 as expected
Energy matching using beam 2
Frequency down 106Hz
SPS +250MeV
Transfer lines trimmed to match
Beam 1 circulating at 22.30
RF synchronisation had changed (was no longer in bucket 1)
Some issues to be followed up with TCDQ position
2/17/2019

24. First turn after energy matching, beam 2
2/17/2019

25. Orbits
2/17/2019

26. Overnight Setting up B1 and B2 before KR campaign
BI team in parasitic mode
First PLL beam transfer function (BTF) measurement of the LHC, before any phase correction
Beta-beating measurements on beam 1
H maximum 40%
V maximum 30%
Lost cryo in S34 at 02.00
PLC problem, similar to S12 earlier in the week
Quench heater firing in S12 while sitting at standby
To be understood
2/17/2019

27. BTF
2/17/2019

28. Friday Recovering from cryo PLC problem S34 (02.00)
Limited access in the shadow for essential things
TCDQ issue understood (IN<->OUT)
Cryo S34 back at 18.00
Still problems to get all QPS OK
S45 access needed
Pre-cycling sectors when possible
Finally all (needed) circuits OK at 23.00
Struggled with the injection interlock system
Beam in around 01.30
Overnight
Re-established conditions for beams 1 and 2
Kick response beam 2 (sectors done)
Beam dumps due to beam loss when starting sector 56
PS off from 04-07
2/17/2019

29. Tunes Beam 1
2/17/2019

30. Tunes Beam 2
2/17/2019

31. Planning at 5 o’clock meeting Friday8
Access A
Recover N
Kick-response SA
Initial commissioning of beam dumping system, beam 1 and 2
B1/B2
Key beam parameters revisited - beam 1 & 2, beam size etc. measure & correct tune, chromacity, coupling both beams
B1/B2, pilot
Optics measurements (beta beating meas and correct) SU
Protection devices and collimator setting-up - b2/b1 4
MPS tests: FMCM, time delays
Trial ramps
B1, pilot MO
Solenoids/coupling compensation
pilot, b1
MPS: BLM thresholds - check plus thresholds and checks on beam dump BLMs
B1/B2 pilots
Aperture measurements
pilot, B2 TU
Two Beam Operation setting-up GeV - bumps
2x2, 5e9
MPS: aperture in insertion regions, Calibration/check of triplet BLMs, experiment dump tests with BCM
pilot
Solenoids & dipoles ON WE
MPS: provoke magnet 'trip' and check adequate protection by collimators
450 GeV collision setting-up - experiments
2x2, 2e10
450 GeV collisions
2/17/2019

32. Saturday Beam dump studies started around 08.00
Synchronisation checked with beam by scanning RF bucket through sweeps for B1 and B2: beam 2 system looks spot on, beam 1 kick is too late by about 1ms - need to adjust to exact value with access to UA when opportune - in the meantime should use RF bucket 500 to make sure beam is extracted (bucket 1 ends up on TCDS and will provoke interlock).
Beam 1
Beam 2

33. Saturday Protection devices and aperture scans
Aperture scanned for B1 extraction channel
Apertures look similar to those obtained for B2 on Monday
Physical apertures seem OK on both planes
Verification of the protection in case of asynchronous dump

34. Saturday
Orbit
Reference orbit B1 and B2 using common correctors
Tune, coupling and chromaticity measurement and correction
C_ down to ~0.005 (Beam 1)/ (Beam 2) after correction
Chromaticity
Measured values from , 50,0 trims off ref Beam 1  Q’H=+5 - Q’V=+7 Beam 2  Q’H=+9 - Q’H=+8
Undulator RU.L4 ON at 50 A:
no effect on orbit/tune (Beam 2)  but not sufficient to see synch light  HW commissioning to be continued

35. Chromaticity measurement

36. Saturday BI commissioning summary
phased in horizontal and vertical MKQA tune kicker for B1 and B2
measured and corrected PLL beam transfer function for B1 and B2 system (B2 requires some polarity/mapping checks)
tested continuous radial modulation via the orbit feedback controller and verified switch on/off procedures, frequency and amplitudes behaviour
performed initial PLL lock studies with B1, initial results look very promising, further assessment w.r.t. nominal PLL performance (bandwidth/sensitivity to resolve dp/p changes in the order of 1e-5) is needed
performed semi-automatic chromaticity measurements and preliminary tune modulation/de-modulation studies in view of continuous Q' tracking -> some FESA/SW issues have been identified that need to be addressed
Not yet ready for tune/chromaticity feedback

37. Tune kicker setting up

38. PLL setting up
Chromaticity measurement

39. PLL tracking
DQ=0.01

40. Chromaticity measurement
QV’=15
QV’=5

41. Saturday/Sunday Summary of beta-beating studies:
The beta-beating in beam2 was very different to the beta-beating measured before the ramp (most likely due to the lack of precycling then).
For Beam1 the initial beta beating agrees with the measured after the ramp (Friday 00:00 am), proving no changes in time with proper pre-cycling.
The first local error was found and successfully corrected in IP2 (MQXB2.R2 + 7e-5 and MQXB2.L2 -5e-5). A reduction of the peak vertical beta-beating in beam 1 of 10% was observed. No change was observed in the peak b-beat in beam 2 and the horizontal of beam1.
We removed all the trims and re-measured the initial conditions without observing any change (no hysteresis effects).
Another study in IP7 was started but due to lack of time and frequent beam absence was not conclusive.

42. Beta beat measurement
Beam 1
Beam 2 H
40% H
40% V
40% V
60%
2/17/2019

43. Beta-beat correction First attempt of beta-beating correction
Requires more time for injection tuning and chromaticity/coupling correction  go back to initial settings for the time being

44. Kick response corrector checks
Beam 1
Beam 2

45. Sunday
Summary collimation setup: BEAM1: => All IR3, IR7 to nominal settings (primary aperture about 5.7 sigma) ==> multi-stage collimation is set up ==> Dump protection IR6 set up ==> TCT's in IR1 cross-checked: rough setting confirmed ==> Other TCT's not touched: at +-15 mm around sigma BEAM2: ==> All IR3, IR7 to nominal settings (primary aperture about 5.7 sigma) ==> mutli-stage collimation is set up ==> Dump protection IR6 set up ==> TCT's not touched: at +-15 mm around sigma Additional tests: ==> Check on interlock threshold for tungsten collimators (see logbook entry) ==> Movement and beam loss response check for vertical Roman Pots, beam1
2/17/2019

46. Finding the beam edge
2/17/2019

47. Roman pots as well
2/17/2019

48. Sunday MPS checks Ramp tests Problem with patrol box in ATLAS 2-4
FMCM reaction checks etc
Ramp tests
Second LHC ramp with beam 1 to 1.04 TeV
Tunes feed forward for next time
Machine did not come back (no pre-cycle)
Tunes off for beam 1
Tunes trimmed (beam 1) and incorporated into ramp
Third ramp with both beams to 1.18 TeV !!
Problem with patrol box in ATLAS 2-4
Injected again around 6
Beam 2 OK
Beam 1 tunes wrong
2/17/2019

49. Ramp 2 orbits
2/17/2019

50. Ramp 2 tunes
2/17/2019

51. Ramp 3 tunes B1
2/17/2019

52. Ramp 3 tunes B2
2/17/2019