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LHC Performance Notes

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2010-05-06
08:34
Injection into LHC of single bunches with nominal intensity / Bartmann, W ; Bracco, C ; Goddard, B ; Holzer, B ; Kain, V ; Lamont, M ; Meddahi, M ; Mertens, V ; Papotti, G ; Redaelli, S et al.
As part of the 2010 LHC commissioning, the intensity of a single INDIV injected bunch was increased from 1e10 to 1.1e11. Some preliminary tests with high intensity bunches to the TL TEDs were used to verify the beam stability and transverse profiles. [...]
LHC-Performance-Note-015; CERN-LHC-Performance-Note-015.- Geneva : CERN, 2010

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2010-04-26
10:01
Expected Performance of the LHC Synchrotron-Light Telescope (BSRT) and Abort-Gap Monitor (BSRA) / Fisher, A S
This Report presents calculations of the synchrotron light from proton and lead-ion beams in the LHC at all energies from 0.45 to 7 TeV. It computes the emission from three sources: the uniform-field region of the D3 dipole, the dipole’s edge field, and the short undulator just upstream. [...]
LHC-Performance-Note-014; CERN-LHC-Performance-Note-014.- Geneva : CERN, 2010 - 36 p. Fulltext: PDF;

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2009-06-30
15:25
Mid/Long-Term Action Plan to Mitigate SEE related Risks at the LHC (and required actions) / Brugger, M ; Ferrari, A ; Kramer, Daniel ; Losito, R ; Myers, S ; Perrot, A L ; Pojer, M ; Røed, K ; Roesler, S ; Solfaroli, M et al.
Modifications of the LHC schedule and the needed planning for future shutdowns requires an approach compatible with all operational scenarios in order to reduce the failures due to SEE around the machine. The R2E study group recommends a list of short-term actions, to plan, analyse and prepare mid/long-term activities and to assign additional resources. [...]
LHC-Performance-Note-013; CERN-LHC-Performance-Note-013.- Geneva : CERN, 2009 - 14 p. Fulltext: PDF;

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2009-06-11
17:20
Proposal to decrease the extraction times for dipoles and quadrupoles during the initial running of the LHC / Meß, K H (CERN)
The proposal to decrease the energy extraction time for the main dipoles and quadrupoles during the initial running up to 5 TeV is discussed. Proposals for practical solutions are presented..
LHC-Performance-Note-012; CERN-LHC-Performance-Note-012.- Geneva : CERN, 2009 - 5 p. Fulltext: PDF;

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2009-02-25
11:58
Polarity Checks in Sectors 23 & 78 / Calaga, R ; Kain, V ; Lamont, M ; Ponce, L ; Sun, Y ; Tomás, R ; Venturini-Delsolaro, W ; Zimmermann, F
During the first three LHC synchronization tests on August 10, August 24, and September 7, 2008, linear and higher-order polarity checks were performed with beam 1 in Sector 23 and beam 2 in Sector 78. The main principle of these checks was to launch free betatron oscillations and use the difference trajectory measurements with respect to inverted polarities of circuits under investigation. [...]
LHC-Performance-Note-010; CERN-LHC-Performance-Note-010.- Geneva : CERN, 2009 - 14 p. Fulltext: PDF;

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2009-01-29
16:27
LHC dispersion measurements 2008 revisited M. Lamont / Lamont, M
The dispersion measurements made during the LHC injection tests are re-analyzed taking into account known polarity errors and the resultant perturbed optics. For beam 1 and beam 2 the measured data is used to establish the dispersion entry conditions at the injection point. [...]
LHC-Performance-Note-009; CERN-LHC-Performance-Note-009.- Geneva : CERN, 2009 Fulltext: PDF;

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2009-01-26
17:02
First Beta-Beating Measurement in the LHC / Aiba, M ; Calaga, R ; Franchi, A ; Giovannozzi, M ; Kain, V ; Morita, A ; Tomás, R ; Vanbavinckhove, G ; Wenninger, J
This note reports on the first LHC beta-beating and coupling measurements. Thanks to an excellent functioning of the BPM system and the related software, injection oscillations were recorded for the first 90 turns at all BPMs of Beam 2. [...]
LHC-Performance-Note-008; CERN-LHC-Performance-Note-008.- Geneva : CERN, 2009 - 11 p. Fulltext: PDF;

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2009-01-20
14:42
First Results from the LHC BBQ Tune and Chromaticity Systems / Boccardi, A ; Gasior, M ; Jones, R ; Karlsson, P ; Steinhagen, RJ
This note summarises the performance and early results obtained with the base-line LHC Tune Measurements System during the first days of LHC operation. Initial tune, coupling and chromaticity measurements as well as initial tune correction are presented..
LHC-Performance-Note-007; CERN-LHC-Performance-Note-007.- Geneva : CERN, 2009 Fulltext: PDF;

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2009-01-20
14:39
First Results from the LHC Beam Instrumentation Systems / Jones, R
This note summarises the early results obtained from the majority of the LHC beam instrumentation systems during the synchronisation tests of the 8th – 10th August, 22nd – 24th August, 5th-7th September and from the first week of full LHC operation..
LHC-Performance-Note-006; CERN-LHC-Performance-Note-006.- Geneva : CERN, 2009 Fulltext: PDF;

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2009-01-19
18:08
Dispersion Free Steering for YASP and dispersion correction for TI8 / Wenninger, J
The LHC injection tests performed in August 2008 revealed a horizontal dispersion mismatch for both the TI2 and the TI8 transfer lines. While the error for TI2 is acceptable and most likely due to an error of the initial conditions at the entrance of the line, the TI8 dispersion error is rather severe. [...]
LHC-Performance-Note-005; CERN-LHC-Performance-Note-005.- Geneva : CERN, 2009 Fulltext: PDF;

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