| Internal Note | |
| Report number | CERN-ACC-NOTE-2017-0018 |
| Title | LHC MD 1087: Controlled Longitudinal Emittance Blow-up with Short Bunches |
| Author(s) | Timko, Helga (CERN) ; Baudrenghien, Philippe (CERN) ; Esteban Muller, Juan ; Jaussi, Michael (CERN) ; Lasheen, Alexandre (CERN) ; Shaposhnikova, Elena (CERN) |
| Corporate author(s) | CERN. Geneva. ATS Department |
| Publication | 2017 |
| Imprint | 30 Mar 2017 |
| Number of pages | 7 |
| Subject category | Accelerators and Storage Rings |
| Accelerator/Facility, Experiment | CERN LHC |
| Technology | Radiofrequency |
| Processes | Beam Dynamics |
| Keywords | intensity effects ; controlled emittance blow-up |
| Abstract | The aim of the MD was to study the controlled longitudinal emittance blow-up applied during the ramp with bunches that are slightly shorter than operational. Earlier MDs in 2015 have shown that with a short target bunch length, the blow-up is less controlled and a bifurcation of bunch lengths occurs. The presented measurements show that the bifurcation is independent of the presence of the bunch length feedback, pointing towards an intensity-dependent phenomenon, originating from a synchrotron frequency shift with intensity. Accurate measurements of synchrotron frequency shift with intensity are presented as well. The measurements took place between 22nd August 2016, 19:00 and 23rd August 2016, 04:00. |
| Submitted by | [email protected] |
レコード 生成： 2017-03-30, 最終変更： 2017-03-30
