Multiple energy extraction can deliver multiple energy flattops per accelerator cycle, improving treatment efficiency. In this process, the extraction efficiency of each flattop and the beam loss during non-extraction times are the key parameters. Such beam loss is mainly composed of the spill intensity overshoot, which reduces the number of particles available for treatment and thereby lowers...
The temporary quality of the slowly extracted beams from a synchrotron on the 100 microseconds time scale is crucial for fixed-target experiments and hadron therapy. The spill micro structure is caused by power supply ripples that act on the ring quadrupoles. To reveal the beam dynamics of the slowly extracted beams, the transit time is investigated theoretically and experimentally. It is a...
Experiments and simulations regarding the micro spill structure of slowly extracted bunched beams have been performed at GSI for years. In SIS18 the bunch spacing was limited to a minimum of 185 us due to the operating frequency range of the installed cavities and LLRF. To overcome this limit, which is not suitable for many detectors, a new cavity system was developed.
The cavity was...
The Mechanical and Materials Engineering group of the Engineering Department at CERN has gained in the last decade important experience in the comprehensive characterization of low Z materials, offering valuable insights into their properties and field of application. We focus on elucidating the unique challenges associated with low Z materials, encompassing their processing, welding...
The CERN Super Proton Synchrotron (SPS) plays a crucial role in the CERN Fixed Target (FT) physics program by extracting proton beams towards the North Area (NA) targets. In order to gradually deliver the proton beams to the three primary NA targets, slow extraction is performed by approaching the third order resonance in the SPS, and the spill is eventually split on two vertical splitters...
A poster describing the limitations of extraction from a compact scaling fixed field accelerator. The LhARA Stage 2 FFA is used as the optics baseline, based on the RACCAM study. RF-KO is applied as the main extraction method.
Poster first presented at IPAC 2023 by A. Steinberg, with results published in IOP conference proceedings.
Mitigating the micro-structure of the spill can be achieved by adjusting the machine settings or manipulating the beam properties. At SIS18, spill smoothing was commissioned by changing the longitudinal distribution of the circulating beam with RF cavities. Tune scan slow extraction was performed using two different frequencies for the RF cavities: bunching was performed at roughly 4.85 MHz (4...
Within the EU-funded activity IFAST, the task REX (Resonance Extraction Improvement) was launched in 2021 as WP 5.3. The IFAST-REX consortium comprises European hadron synchrotron facilities CERN and GSI, the hadron therapy centres CNAO, HIT, MedAustron, MIT and SEEIIST, as well as the companies Barthel HF-Technik and Bergoz Instrumentation. It deals with the crucial challenge of slow...
The High energy FRagment Separator (HFRS), a new generation in-flight radioactive separator in the intensity Heavy Ion Accelerator Facility (HIAF), is under construction in China. It is characterized by large ion-optical acceptance, high resolution power, high magnetic rigidity, and excellent particle identification. In combination with the HIAF accelerator facility, which will provide...
The HIAF project is a new international advanced accelerator in China, which needs a new type of high power, high precision, fast-cycling pulse power supplies to provide excitation current for the magnets of its B-Ring system.
The HIAF project is a new international advanced accelerator in China, which needs a new type of high power, high precision, fast-cycling pulse power supplies to provide excitation current for the magnets of its B-Ring system.
The High energy FRagment Separator (HFRS), a new generation in-flight radioactive separator in the intensity Heavy Ion Accelerator Facility (HIAF), is under construction in China. It is characterized by large ion-optical acceptance, high resolution power, high magnetic rigidity, and excellent particle identification. In combination with the HIAF accelerator facility, which will provide...
