Emittance measurements of the ACCEL K250 superconducting medical cyclotron at Paul Scherer institute (original) (raw)

Status Report of the Accel 250 Mev Medical Cyclotron

2000

Since 2001 a superconducting cyclotron for proton therapy has been designed in collaboration with the National Superconducting Cyclotron Laboratory (NSCL) at ACCEL Instruments GmbH (1). The design is based on a NSCL proposal originating from 1993 (2). In the recent years two cyclotrons of this type were built, tested as far as magnetic and cryogenic properties are concerned and installed

Isochronism of the ACCEL 250MeV medical proton cyclotron

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007

Beam phase measurements performed during the commissioning of the ACCEL 250 MeV medical proton cyclotrons are presented and compared to results of orbit tracking computations based on high accuracy magnetic field map measurements. The agreement between measured and intended beam phase behavior was found to be excellent. r

Study of the Beam Extraction from Superconducting Cyclotron SC200

2017

According to the agreement between the Institute of Plasma Physics of the Chinese Academy of Sciences (ASIPP) in Hefei, China, and the Joint Institute for Nuclear Research (JINR), in Dubna, Russia, the project of superconducting isochronous cyclotron for proton therapy SC200 is under development at both sites. The cyclotron will provide acceleration of protons up to 200 MeV with maximum beam current of ~1 μA. Extraction system of the beam consists of electrostatic deflector and two passive magnetic channels. Electric field strength in deflector does not exceed 170 kV/cm, gradients of magnetic field in channels are in a range of 24 kG/cm. Both channels focus the beam in horizontal plane. Axial focusing of the beam is provided by edge magnetic field of the cyclotron. Results of the beam tracking inside extraction system are presented. Efficiency of the beam extraction was estimated for different amplitudes of the betatron oscillations in the accelerated beam. WORKING DIAGRAM OF CYCLOT...

Commissioning of the Accel 250 MeV proton cyclotron

Proc. of the Eighteenth …, 2007

The ACCEL superconducting 250 MeV proton cyclotron at PSI/Switzerland is fully operational and in clinical use. The commissioning on site started in December 2004 whereas the commissioning of an identical system installed at RPTC/Germany begun only two month later. After conditioning of the RF system to a power of 120 kW first beam was extracted from both machines in April 2005. By the end of the same year the key specifications were met and the main design goals reached. During 2006 further refinements of the hardware setup and control system have been implemented. Automatic start-up routines and a phase feedback loop have been introduced to optimize the reliability and stability of beam operation. Since beginning of this year the PSI machine is in routine operation. The design of the compact machine, proposed by Henry Blosser and his team [1] and further developed and manufactured by ACCEL, proved to be very successful in operation with low energy consumption, high energy and intensity output, high internal efficiency, low internal activation, reproducible beam properties and reliable operation. We report about details of the commissioning process, performance of the machines and the progress that has been made.

A simple method to measure proton beam energy in a standard medical cyclotron*

Australasian Physics & Engineering Sciences in Medicine, 2009

A simple and rapid technique to measure the proton beam energy in the external beam line of a medical cyclotron has been examined. A stack of 0.1 mm thick high purity copper (Cu) foils was bombarded and the relative activity of 65 Zn produced in each foil was compared to a computational model that predicted activity, based on proton stopping power, reaction cross-sectional data, and beam energy. In the model, the beam energy was altered iteratively until the best match between computed and measured relative activities of the stack of disks was obtained. The main advantage of this method is that it does not require the comparison of the activities of different isotopes of zinc arising from (p, xn) reactions in the Cu, which would require the gamma photon detector being calibrated for different energy responses. Using this technique the proton beam energy of a nominally 18 MeV standard isochronous medical cyclotron was measured as 17.49 r 0.04 (SD) MeV, with a precision of 0.2 % CV.

Research and Development of the SC230 Superconducting Cyclotron for Proton Therapy

Physics of Particles and Nuclei Letters, 2021

This paper presents a conceptual design of the compact SC230 superconducting cyclotron that accelerates a beam of protons to 230 MeV and is intended for proton therapy and biomedical research. SC230 is an isochronous four-sector cyclotron based on a shell-type magnet with a magnetic field in the center of 1.7 T. Superconducting coils will be enclosed in a cryostat; all other parts of the cyclotron are warm. Acceleration is carried out at the fourth harmonic mode of the accelerating high-frequency (HF) system consisting of four resonators located in the cyclotron valleys. The accelerator employs an internal Penning-type hot cathode source. Extraction is carried out using an electrostatic deflector located in the gap between the sectors and two passive magnetic channels.

BEAM DIAGNOSTIC COMPONENTS FOR SUPERCONDUCTING CYCLOTRON AT KOLKATA

VEC Centre Kolkata has constructed a K500 superconducting cyclotron (SCC). Several beam diagnostic components have been designed, fabricated and installed in SCC. In the low energy beam line, uncooled slits, faraday cup, beam viewers, and collimators are used. The inflector is also operated in a faraday cup mode to measure the beam inside SCC. The radial probe and viewer probe are respectively used to measure beam current and to observe the beam size and shape inside SCC. The magnetic channels, electro-static deflectors and M9 slit are also used to measure beam current at the extraction radius. Water cooled faraday cup and beam viewers are used in the external beam line. The radius of curvature of the radial probe track was reduced to align the internal and external track during its assembly. It was observed that the probe did not functioning properly during beam trials. Different modifications were incorporated. But, problem with the probe persisted. The paper describes the beam diagnostic components used in the cyclotron, discusses the problems faced in operating the radial probe, modifications tried and outlines the future steps planned to operate the beam diagnostic components.