JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
@inproceedings{karlsen-baeck:hb2023-thbp29,
author = {B.E. Karlsen-Bæck and T. Argyropoulos and A.C. Butterworth and R. Calaga and I. Karpov and H. Timko and M. Zampetakis},
% author = {B.E. Karlsen-Bæck and T. Argyropoulos and A.C. Butterworth and R. Calaga and I. Karpov and H. Timko and others},
% author = {B.E. Karlsen-Bæck and others},
title = {{Effects of Cavity Pre-Detuning on RF Power Transients at Injection into the LHC}},
% booktitle = {Proc. HB'23},
booktitle = {Proc. 68th Adv. Beam Dyn. Workshop High-Intensity High-Brightness Hadron Beams (HB'23)},
eventdate = {2023-10-09/2023-10-13},
pages = {530--533},
paper = {THBP29},
language = {english},
keywords = {cavity, simulation, injection, operation, controls},
venue = {Geneva, Switzerland},
series = {ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams},
number = {68},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {04},
year = {2024},
issn = {2673-5571},
isbn = {978-3-95450-253-0},
doi = {10.18429/JACoW-HB2023-THBP29},
url = {https://jacow.org/hb2023/papers/thbp29.pdf},
abstract = {{At injection into the LHC, the RF system is perturbed by beam-induced voltage resulting in strong RF power transients and the instant detuning of the cavities. The automatic tuning system, however, needs time for the mechanical compensation of the resonance frequency to take place. Acting back on the beam, the transients in RF power are expected to limit the maximum injected intensity by generating unacceptable beam loss. Reducing them is therefore essential to reach the target intensity during the High Luminosity (HL) LHC era. At LHC flat bottom, the cavities are operated using the half-detuning beam-loading compensation scheme. As implemented today, the tuner control algorithm starts acting only after the injection of the first longer bunch train which causes the bunches for this injection to experience the largest power spikes. This contribution presents an adapted detuning scheme for the RF cavities before injection. It was proposed as a path to decrease the transients, hence increasing the available intensity margin for the available RF power. The expected gain is evaluated in particle tracking simulations and measurements acquired during operation.}},
}