| Internal Note | |
| Report number | CERN-ACC-NOTE-2020-0034 |
| Title | MD3308 – Growth rate versus chromaticity measurement at injection |
| Author(s) | Amorim, David (CERN) ; Antipov, Sergey (CERN) ; Buffat, Xavier (CERN) ; Carideo, Emanuela (CERN) ; Dascalu, Titus-Stefan (CERN) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) ; Oeftiger, Adrian (CERN) ; Salvant, Benoit (CERN) ; Valuch, Daniel (CERN) |
| Corporate author(s) | CERN. Geneva. ATS Department |
| Publication | 2020 |
| Imprint | 29 May 2020 |
| Number of pages | 8 |
| Subject category | Accelerators and Storage Rings |
| Accelerator/Facility, Experiment | CERN LHC |
| Keywords | LHC ; impedance ; instability |
| Abstract | This report summarises the results of MD3308 on the measurement of the instability rise time as a function of chromaticity in the LHC. The measurement was held in the MD block 3 of 2018, on the afternoon of the 14th of September. With nominal bunches at the injection energy, the horizontal and vertical chromaticities were trimmed in the negative range from ∼-40 to -2 units. The transverse damper (ADT) was switched off to let an instability develop. The turn-by-turn position signal was then recorded with the ADT ObsBox. From these signals, the rise-time was deduced and compared to a prediction derived from the LHC impedance model. |
| Other source | Inspire |
| Submitted by | [email protected] |
レコード 生成： 2020-06-12, 最終変更： 2020-08-10
