Concept EM Design of the 650 MHz Cavities for the Project X (original) (raw)

Design Study of RF Section and Cavities for Cepc 650 MHz Klystron

2016

An 800 kW CW klystron operating at 650 MHz is developed for CEPC at Institute of High Energy Physics in China. The conceptual design has been finished and the main parameters are presented in this paper. A 1D large signal disk model code, AJDISK, has been used to design and optimize klystron RF section parameters. In addition, the RF cavities have been designed using SUPERFISH, HFSS and CST.

Design and Construction of 126 MHz Capacity Loaded Aluminium Cavity Prototype

2017

I Iranian light source Facility (ILSF) is a 3 GeV Ultra low emittance synchrotron with 528 meter circumference that will be constructed in the city of Qazvin, located 150km west of Tehran. Motivated by the development of HOM damped cavity with simpler structure at 100 MHz at MAX Lab and also lower costs, 100 MHz RF system is envisaged for ILSF booster and storage ring. An RF cavity prototype was fabricated for better understanding of characteristics of capacity loaded RF cavities by practical investigation. In this paper, design and development of this prototype is presented with the simulation and measurement results. Introduction The Iranian Light Source Project (ILSF) is a 3rd generation light source containing a 3 GeV storage ring with 0.27nm.rad emittance, a full energy booster injector and a 150 MeV linac as pre-injector. The stored beam current of 100mA at commissioning phase will gradually increase up to 400mA in top up mode at final phase of operation [1]. After a thorough ...

Electromagnetic Design of a $\beta_{g} = 0.9$ 650-MHz Superconducting-Radio-Frequency Cavity

IEEE Transactions on Applied Superconductivity, 2000

We present the electromagnetic design study of a multi cell,  g = 0.9, 650 MHz elliptic superconducting radiofrequency cavity, which can be used for accelerating Hparticles in the linear accelerator part of a Spallation Neutron source. The design has been optimized for maximum achievable acceleration gradient by varying the geometry parameters of the cavity, for which a simple and general procedure is evolved that we describe in the paper. For the optimized geometry, we have studied the higher order modes supported by the cavity, and the threshold current for the excitation of the regenerative beam break up instability due to dipole modes has been estimated. Lorentz force detuning studies have also been performed for the optimized design and the calculations are presented to find the optimum location of the stiffener ring to compensate for the Lorentz force detuning.

Simulation, Measurement and Tuning of a Prototype Disk Loaded RF Cavity

2017

Constant impedance accelerator RF cavities are constructed from similar resonator cells that stacked to each other. Best operation condition is achieved when all of cells resonate in one resonance frequency with similar quality factors. So, measurement and tuning of RF cavities is the critical step for final best operation of linear accelerators. In this paper, the electromagnetic computer simulations, RF measurement and final tuning of a nine cell periodic accelerator structure was represented. All of cavities tuned in one resonant frequency and according to theoretical concepts we obtain nine resonant modes from RF measurements by vector network analyzer. INTRODUCTION Linear electron accelerators are designed in various types and have wide applications in medicine, industry, agriculture and physics researches [1-2]. Main components of RF electron Linacs are RF power generators, power transmission waveguides, vacuum pumps and components, electron gun and acceleration cavities [3-4]...

Electromagnetic Waves in Cavity Design

2011

Understanding electromagnetic wave phenomena is very important to be able to design RF cavities such as for atmospheric microwave plasma torch, microwave vacuum oscillator/amplifier, and charged-particle accelerator. This chapter deals with some electromagnetic wave equations to show applications to develop the analytic design formula for the cavity. For the initial and crude design parameter, equivalent circuit approximation of radial line cavity has been used. The properties of resonator, resonant frequency, quality factor, and the parallel-electrodes gap distance have been considered as design parameters. The rectangular cavity is introduced for atmospheric microwave plasma torch as a rectangular example, which has uniform electromagnetic wave distribution to produce wide area plasma in atmospheric pressure environment. The annular cavity for klystrode is introduced for a microwave vacuum oscillator as a circular example, which adapted the grid structure and the electron beam as ...

Engineering and building RF structures - the works

2004

The translation of the physics designs of linear accelerators into engineering and manufacturing requirements is discussed. The stages of conceptual design, prototyping, final design, construction, and installation are described for both superconducting (LANL β = 0.175 Spoke Cavity) and normal-conducting (APT/LEDA 6.7 MeV RFQ) accelerators. An overview of codes that have linked accelerator cavity and thermal/structural analysis modules is provided.

Design OF RF Cavities and RF Section Of S Band Klystron

High power CW Klystrons are widely used for advanced scientific applications such as high energy charged particle accelerator and plasma heating for nuclear fusion experiment. The present project has been taken up to study the design of RF section of 6MW, CW, S-Band Klystron tube which has a projected national requirement for high energy RF linear accelerators. The thesis presents the design methodologies adopted and results of the study during the course of project. At first approximate dimensions of re-entrant cavities with desired RF parameters to be used in RF section were determined using a 2D SUPERFISH code. This was followed by validation of design parameters using 3D CST- Microwave Studio code. Further, presuming approximately a gain of 10 dB per cavity, it was decided to use five cavities including input and output cavities. The design parameters of complete RF section including resonating frequency, gap length and R/Q of each individual cavity, centre to centre distance between consecutive cavities etc. were then determined using 1D Klystron design code AJDISK. This gives a fairly good estimate of various electrical and dimensional parameters of RF section to get desired tube performance

Design of TE Cavities for RF Energy Storage

IEEE Transactions on Nuclear Science

Abstracz: This paper deals with the design of high 0 TE resonators for high efficiency RF pulse compression. This kind of resonator 1s used to double the energy gradient of linear accelerators. In order to study the influence of the geomet:-y of the resonator on the Q , a computer code nemed OSCAR2D was developed. By means of this code ar, optimum geometry for TE storage cavfties was found. The results of the computer simulation are shortly compared with the experimental measurements performed on a TE caiilty prototype.

The New 118 MHz Cavity for RF Development Activities of the RF for Accelerator Laboratory at SLRI

2018

The RF for accelerator laboratory is established at SLRI to perform RF related development activities of the current light source and the future synchrotron light facility in Thailand. One of activities is to build an in-house RF cavity. It will be used for testing of RF amplifier unit and the developed LLRF system. The cavity is a nose-cone pillbox cavity operating at 118 MHz and aiming at 100 kV gap voltage. Details of designing in particular the inner surface profile, the RF properties, the higher order modes properties, the RF power coupler, and the tuning mechanism will be presented with the manufacturing timeline.

Design, simulation and test of cavity in UHF band

Electronics Letters, 2009

A simple and successful design for a UHF cavity is presented with a rejection factor inferior to 247 dB for a difference of 1.6 MHz between the transmit frequency and the receive frequency, the insertion loss being less than 1 dB. A coil connected to the resonator ensures a 50 V adaptation. Modelling of the device, based on Pspice software, is described.