1. Transfer line test: Beam stability measurements
TI 8 trajectory stability
TI 2 trajectory stability
SPS orbit stability by Eliana
MKE.4 waveform scan
MKE.6 waveform scan
+ IQC status

2. Reminder: Large shot-by-shot transfer line trajectory variations in the horizontal plane discovered in 2011
Investigations revealed the SPS extraction septa as the main source for both lines. At the end of 2011 work was started to improve the power converter of the MSE.6 (TI2) which lead to improved stability. Work continued on the MSE.4 during LS1.

3. Transfer line test: TI 8 Trajectory stability studies
246 trajectories analysed
:30: :21:15
Removed BPMI BPCEs

4. TI 8: Model Independent Analysis gives 1 source which matches MSE
TI 8: Model Independent Analysis gives 1 source which matches MSE.4, but..

5. TI 8: The strength has been reduced by almost a factor 2
APRIL 2012
NOVEMBER 2014
APRIL 2012 (Q26)
NOVEMBER 2012
NOVEMBER 2014
RMS H [mm]
95.6 -
73.9
RMS V [mm]
62.6
63.5
Eigenvalue #1H [mm]
72.9
42.2
MSE stD [A]
4.5
3.9
2.1
MSE stD [1e-3]
0.20
0.18
0.10

6. Transfer line test: TI 2 Trajectory stability studies
256 trajectories analysed
:34: :12:59
Removed 5 BPMIs + BPCEs

7. TI 2: MSE.6 is the main source

8. For TI2 the stability of the MSE
For TI2 the stability of the MSE.6 was already improved during LHC Run I by a factor 2
JUNE 2011
APRIL 2012
NOVEMBER 2014
JUNE 2011 (Q26)
APRIL 2012 (Q26)
NOVEMBER 2012
NOVEMBER 2014
RMS H [mm]
92.1
83.0 -
74.2
RMS V [mm]
35.1
64.4
63.4
Eigenvalue #1H [mm]
86.0
54.4
38.9
MSE stD [A]
3.6
2.4
1.9
1.8
MSE stD [1e-3]
0.18
0.12
0.10

9. Eliana has analysed the SPS orbit data from the transfer line test and the weekend after
Data sets:
#1 Friday November
#2 Saturday November
#3 Friday 28. November
#4 Saturday 29. November
#5 Sunday 30. November
* A selection of plots, see more in attached slides

10. Within each set the orbit is stableV
SPS mains switched off for 7 min at set #25, step in V at #30
Eliana Gianfelice

11. Large orbit difference between set #2 and set #1
Correct set #1 back to set #2 reference:
Best corrector: MSE with ~ -18 mrad
Fourier analysis give peak at 21, tune was off by +0.5
Eliana Gianfelice

12. Large orbit difference between set #3 and set #2 (~1 week)
Correct set #3 back to set #2 reference:
Best corrector: MBA (180 counts) with ~ -9 mrad
Eliana Gianfelice

13. No significant correction between set #4 and set #2
Correct set #4 back to set #2 reference:
Eliana Gianfelice

14. No significant correction between set #5 and set #2
Correct set #5 back to set #2 reference:
Eliana Gianfelice

15. Reminder: Why waveform scans?
IQC Injection Oscillations per bunch - B2
Horizontal plane
Vertical plane
Large bunch-by-bunch variations
12 bunches not representable for correction

16. Reminder: MKE.4 waveform scan from October 2011
Error bars: 0.5 murad
Difference over 144 bunch injection: p2p = 12.1 mrad, avg = 2.8 mrad
Difference to 12 and 144 bunches: 4.7 mrad

17. Reminder: Delay changed from 54 to 53.2 ms for 2012 run
400343
Difference over 144 bunch injection: p2p = 8.1 mrad, avg = 2.5 mrad
Difference to 12 and 144 bunches: 0.6 mrad (1.5 mrad for 6 bunches)

18. 2014 MKE.4 waveform scan Proposed delay 48.1 ms
Screen BTV (400105)
Error bars: 1 murad
Proposed delay 48.1 ms
Difference over 144 bunch injection: p2p = 6.8 mrad, avg = 1.7 mrad
Difference to 12 and 144 bunches: 0.6 mrad (0.2 mrad for 6 bunches)

19. Comparison of scans to lab measurements:
Beam scans:
June 2009: five unserigraphed magnets (5U+0S);
Oct. 2011: magnets #2 & #3 serigraphed, #1, #4 & #5 unserigraphed (3U+2S);
Nov. 2014: five serigraphed magnets (5S).
Mike Barnes

20. LSS4 Layout - Summary Prior to Dec 2010: no MKE4s serigraphed.
#2 & #3 exchanged for serigraphed versions 12/2010.
#4 & #5 exchanged for serigraphed versions 12/2011.
# exchanged for serigraphed version 04/2013.
41631
41634
41637
41651
41654 L1 L9 S6 S4 L5
Double foot
H20 in
PFN
Single foot
TMR
BEAM
Magnet #1
Magnet #2
Magnet #3
Magnet #4
Magnet #5
VPIB_41632
VPIB_41633
VPIB_41635
VPIB_41636
VPIB_41638
VPIB_41639
VPIB_41652
VPIB_41653
VPIB_41655
VPIB_41656
Serigraphed from 12/2010 (was L5)
Serigraphed from 04/2013 (was L2)
Serigraphed from 12/2011 (was S7)
Serigraphed from 12/2011 (was L1)
Serigraphed from 12/2010 (was S4)
Prior to April 2013: L1 was L2 (not-serigraphed)
Prior to December 2011: S4 was S7 (not-serigraphed)
L5 was L1 (not-serigraphed)
Prior to December 2010: L9 was L5 (not-serigraphed)
S6 was S4 (not-serigraphed)
On December 15, 2010: Faulty Ion Pump VPIB_41632 replaced
Faulty Ion Pump VPIB_41635 replaced
Faulty Penning Gauge VGHB_41655 replaced
Mike Barnes

21. 2014 MKE.6 waveform scan Proposed delay 38.5 ms
Delay setting during 2014 scan: 40
Error bars: 2 murad
Screen
Proposed delay 38.5 ms
Difference over 144 bunch injection: p2p = 9.4 mrad, avg = 1.7 mrad
Difference to 12 and 144 bunches: 1.6 mrad (0.1 mrad for 6 bunches)
* Probably smaller as measurement error is around ±2 mrad

22. IQC data collection, analysis and GUI running smoothly
IQC data collection, analysis and GUI running smoothly ..a few issues to be followed up:
LHC Beam Loss Monitors: still some new monitors not installed
1 (of 12) LHC BPM crate not giving data (bad timestamp)
Transfer line BCT sometimes give wrong result  set correct sensitivity setting from sequencer
Few issues in analysis/panel  small updates in SCRAPER, BLM and FAST RESULT modules
Check Fast result with injection sequencer
Thresholds not updated
(BLMs, MKIs etc.)

23. Summary Shot-by-shot trajectory variations:
MSE.8 current stability improved by a factor 2 during LS 1
MSE.6 current stability improved by a factor 2 during Run I
SPS orbit has very small variations within this time, but changes over time need to be further investigated
Bunch-by-bunch trajectory variations:
MKE.4 waveform improved, but not as much as expected
Optimised delay: 48.1 ms
MKE.6 waveform is flat (no change)
Optimised delay: 38.5 ms