K. Baptiste
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View article: Digital Low-Level RF control system for Accumulator Ring at Advanced Light Source Upgrade Project
Digital Low-Level RF control system for Accumulator Ring at Advanced Light Source Upgrade Project Open
Currently ALS is undergoing an upgrade to ALSU to produce 100 times brighter soft X-ray light. The LLRF system for Accumulator Ring (AR) is composed of two identical LLRF stations, for driving RF amplifiers. The closed loop RF amplitude an…
View article: Design Progress of ALS-U 3rd-Harmonic Cavity
Design Progress of ALS-U 3rd-Harmonic Cavity Open
A higher-harmonic rf cavity (HHC) system is required in the ALS-U storage ring to lengthen the bunches, reduce intrabeam-scattering effects, and improve Touschek beam lifetime. A 3rd harmonic, normal conducting, passive-cavity system has b…
View article: Proposed design and optimization of a higher harmonic cavity for ALS-U
Proposed design and optimization of a higher harmonic cavity for ALS-U Open
Higher harmonic cavities (HHCs), also known as Landau cavities, have been proposed to increase the beam lifetime and Landau damping by lengthening the bunch and increasing the synchrotron tune spread. Here, we present an optimized 1.5 GHz …
View article: Low phase noise master oscillator generation and distribution for ALS and ALS-U
Low phase noise master oscillator generation and distribution for ALS and ALS-U Open
The coax based MO distribution system in the ALS is going to be replaced by a modernized, lower phase noise and more interference tolerant version, ready to support ALS-U operation. System aspects are shown and several commercial analog an…
View article: Digital Low-Level RF control system for Advanced Light Source Storage Ring
Digital Low-Level RF control system for Advanced Light Source Storage Ring Open
We have commissioned the digital Low Level RF (LLRF) system for storage ring RF at Advanced Light Source at Lawrence Berkeley National Lab (LBNL). The system is composed of 42 synchronous sampling channels for feedback control, diagnostics…
View article: Optimization of RF Cavities Using MOGA for ALS-U
Optimization of RF Cavities Using MOGA for ALS-U Open
A multi-objective genetic algorithm-based optimiza-tion process has been applied to optimize the RF design of a 500 MHz main cavity and a 1.5 GHz Higher Harmon-ic Cavity (HHC) for the Advanced Light Source upgrade (ALS-U) in Lawrence Berke…
View article: Design Study on Higher Harmonic Cavity for ALS-U
Design Study on Higher Harmonic Cavity for ALS-U Open
The ALS upgrade (ALS-U) to a diffraction-limited light source [1] depends on the ability to lengthen the stored bunches to limit the emittance growth and increase the beam life time. Higher harmonic cavities (HHCs), also known as Landau ca…
View article: Design Progress of ALS-U, the Soft X-ray Diffraction Limited Upgrade of the Advanced Light Source
Design Progress of ALS-U, the Soft X-ray Diffraction Limited Upgrade of the Advanced Light Source Open
The ALS-U project to upgrade the Advanced Light Source to a multi bend achromat lattice received CD-1 approval in 2018 marking the end of its conceptual design phase. The ALS-U design promises to deliver diffraction limited performance in …
View article: High Precision Synchronization Development for HiRES, the Ultrafast Electron Diffraction Beamline at LBNL
High Precision Synchronization Development for HiRES, the Ultrafast Electron Diffraction Beamline at LBNL Open
Precise synchronization between the laser and electron is critical for the pump-probe experiments in the HiRES Ultrafast Electron Diffraction facility. We are upgrading the LLRF and laser control system, which ultimately aims at a synchron…
View article: Status of the Conceptual Design of ALS-U
Status of the Conceptual Design of ALS-U Open
The ALS-U upgrade promises to deliver diffraction limited performance throughout the soft x-ray range by lowering the horizontal emittance to about 50~pm resulting in 2-3 orders of brightness increase for soft x-rays compared to the curren…
View article: Multimodal Interaction in the ALS Longitudinal Feedback Kicker RF Cavity
Multimodal Interaction in the ALS Longitudinal Feedback Kicker RF Cavity Open
RF cavities are essential components in particle accelerators not only for beam acceleration, but also for control purposes (bunch lengthening/shortening, deflecting and crabbing, transverse and longitudinal kickers) and for beam diagnosti…