Development of a fast scintillator based beam phase measurement system for compact superconducting cyclotrons (original) (raw)
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Beam phase measurement system for the K130 cyclotron in Jyväskylä
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1993
A phase measurement system for Jyviiskylii new K =130 heavy ion cyclotron has been designed and realized . The phase measurement is done using a set of capacitive probes to detect phase information from the internal ion beam . This data is vital for tuning purposes to obtain an isochronous magnetic field and to maximize the ion beam intensity.
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.
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...
Beam Diagnostics Design for a Compact Superconducting Cyclotron for Radioisotope Production
2017
The aim of the AMIT cyclotron is to deliver an 8.5 MeV, 10 μA CW proton beam to a target to produce radioisotopes for PET diagnostics. Such a small cyclotron poses some challenges to the diagnostics design for commissioning and normal operation due to its small size, so miniaturized devices should be built in order to fit in the available space. Two sets of diagnostics have been designed, each one aiming at a different phase of the machine lifecycle. During normal operation the stripping foil and the target will be used to measure the current, a dual transverse profile monitor based on a scintillating screen will be used for interceptive measurements and a Fluorescence Profile Monitor will measure the beam position and the horizontal profile without intercepting the beam. During first stages of commissioning the dual transverse profile monitor and the target will be substituted by an emittance monitor based on a pepperpot to characterize the beam at the cyclotron exit. Also a movabl...
Characteristics of Beam Extraction System of K500 Superconducting Cyclotron
Extensive Magnetic Field measurement of the K500 Superconducting Cyclotron has been completed. In this paper we report the beam dynamical calculations along the extraction system based on the measured magnetic field data. The beam matching to the external beam transport system, for different ion species spanning the operating region is also explored.
2013
This paper describes various measurements performed on the beam behaviour with the help of the main probes and the differential probe to have a clear insight of the accelerating beam and the difficulties of beam -extraction process in the K500 superconducting cyclotron at Kolkata. Beam shadow measurements with three probes at three sectors were done to get the information of beamcentering and radial oscillations. The radial oscillation amplitude is estimated from the measurements. A differential probe was used to measure the turn separation and its modulation due to radial oscillation. With the help of magnetic field detuning method, the beam phase history was also measured.
Beam imaging in the injection line of the INFN-LNS superconducting cyclotron
Review of Scientific Instruments, 2016
A cheap and efficient diagnostic system for beam monitoring has been recently developed at INFN-LNS in Catania. It consists of a high sensitivity CCD camera detecting the light produced by an ion beam hitting the surface of a scintillating screen and a frame grabber for image acquisition. A scintillating screen, developed at INFN-LNS and consisting of a 2 μm BaF2 layer evaporated on an aluminium plate, has been tested by using 20Ne and 40Ar beams in the keV energy range. The CAESAR ECR ion source has been used for investigating the influence of the frequency and magnetic field tuning effects, the impact of the microwave injected power, and of the focusing solenoids along the low energy beam transport on the beam shape and current. These tests will allow to better understand the interplay between the plasma and beam dynamics and, moreover, to improve the transport efficiency along the low energy beam line and the matching with the superconducting cyclotron, particularly relevant in v...
Beam Phase Detection for Proton Therapy Accelerators
2005
The industrial application of proton cyclotrons has become one of the important contributions of accelerator physics to medical therapy during the last years. Beam phase, energy, and intensity of the accelerated proton bunches can be detected by non-intercepting capacitive cylindrical probes. For the read out of the detected pulsed signals an advanced phase detection system using vector demodulating technique was developed. It has a very large dynamic range allow measurements over a beam current range of up to three orders of magnitude. In order to avoid interference from the fundamental cyclotron frequency of 72 MHz, the phase detection is performed at the second harmonic frequency. A phase detection range of 180° was achieved at the fundamental frequency. To improve accuracy a digital low pass filter with adjustable bandwidth and steepness is implemented. With an estimated sensitivity of the capacitive pickup in the beam line of 30 nV per nA proton beam at 250 MeV, accurate phase and intensity measurements are expected to be possible down to beam currents of 3.3 nA. First measurements at the cyclotrons will show how far the resolution will be limited to higher values by RF disturbance at the fundamental frequency.
A CCD camera probe for a superconducting cyclotron
Conference Record of the 1991 IEEE Particle Accelerator Conference
The traditional internal beam probes in cyclotrons have consisted of a differential element, a wire or thin strip, and a main probe with several fingers to determine the vertical distribution of the beam. The resolution of these probes is limited, especially in the vertical direction. We have developed a probe for our K1200 superconducting cyclotron based on a CCD TV camera that works in a 6 T magnetic field. The camera looks at the beam spot on a scintillating screen. The TV image is processed by a frame grabber that digitizes and displays the image in pseudocolor in real time. This probe has much better resolution than traditional probes. We can see beams with total currents as low as 0.1 pA, with position resolution of about 0.05 mm.