Study of Lorentz force detuning and its compensation in superconducting radiofrequency cavity: A review

Rathore, Mayur; Jain, Vikas; Atulkar, Ashok; Singh, Kuldeep; Porwal, Rajkumar

doi:10.1016/j.matpr.2020.11.506

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…Thanks to these properties, high purity Nb is used for the fabrication of superconducting radiofrequency (SCRF) accelerating cavities [13], superconducting sheets [14], pressure tubes for nuclear reactors and the chemical process industry [15] and so on [16]. Among these applications, the production of SCRF cavities is probably the most challenging and intriguing.…”

Section: Introductionmentioning

confidence: 99%

Formability and surface quality of non-conventional material sheets for the manufacture of highly customized components

et al. 2022

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In this work, incremental forming of pure niobium planar isotropic sheets was studied; in particular, two different types of test were conducted by varying the tool/sheet contact conditions, in order to understand the complex phenomena interesting this hard-to-form non-conventional material and to focus the attention on its formability and the finishing of the worked surfaces. From the tests, the formability limits were determined, the forming forces were acquired and analysed, the quality of the worked surfaces was evaluated with measures of roughness and high-magnification visual inspection, as well as the failures of the sheets were observed and interpreted. The results highlight that a proper choice of the contact conditions can avoid the occurrence of galling while preserving an optimal carrying out of the process. In any case, very good surface finishing and workability of niobium sheets, despite their brittle nature, is found when incrementally formed. As a consequence, incremental sheet forming of this non-conventional material can be considered a faisible way of manufacturing highly customized components.

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Section: Introductionmentioning

confidence: 99%

Formability and surface quality of non-conventional material sheets for the manufacture of highly customized components

et al. 2022

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“…Force fluctuations occurring in a linear motor feed system are a topical issue that affect the accuracy of system operation. Attempts are made to solve it by applying various algorithms; from the magnetic field model of the peranent magnet air gap [13], the model of permanent magnetic linear synchronous motors (PMLSM) [14], the equivalent circuit model obtained by theoretical analysis [15,16], the conformal mapping (CM) method for determining torque [17,18], PMLSM analysis method [14], multiple changes of traction harmonics of different motion parameters [19], development of compensation control strategies to improve traction oscillations as a periodic disturbance compensation strategy [20], force wave compensation strategy [21] and a comprehensive strategy for trinities, disturbances and surges [22,23]. To maintain the dynamic stability of the linear stage and its static error at its minimum, it is required to calibrate static error by optical methods and tune the transfer function in frequency domain.…”

Section: Introductionmentioning

confidence: 99%

Investigation of X and Y Configuration Modal and Dynamic Response to Velocity Excitation of the Nanometer Resolution Linear Servo Motor Stage with Quasi-Industrial Guiding System in Quasi-Stable State

et al. 2021

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Research institutions and industrial enterprises demand high accuracy and precision positioning systems to fulfil cutting edge requirements of up-to-date technological processes in the field of metrology and optical fabrication. Linear motor system design with high performance mechanical guiding system and optical encoder ensures nanometer scale precision and constant static error, which can be calibrated by optical instruments. Mechanical guiding systems has its benefits in case of control theory and its stability; unfortunately, on the other hand, there exists high influence of structure geometry and tribological effects such as friction and modal response. The aforementioned effect cannot be straightforwardly identified during the assembly process. Degradation of dynamic units can be detected only after certain operating time. Single degree of freedom systems are well investigated and the effect of degradation can be predicted, but there exists a gap in the analysis of nanometer scale multi degree of freedom dynamic systems; therefore, novel diagnostic tools need to be proposed. In this particular paper, dual axes dynamic system analysis will be presented. The main idea is to decouple standard stacked XY stage and analyse X and Y configuration as two different configurations of the same object, while imitators of corresponding axes are absolutely solid and stationary. As storage and analysis of time domain data is not efficient, main attention will be concentrated on frequency domain data, while, of course, statistical and graphical representation of dynamic response will be presented. Transfer function, dynamic response, spectral analysis of dynamic response, and modal analysis will be presented and discussed. Based on the collected data and its analysis, comparison of X and Y responses to different velocity excitation will be presented. Finally, conclusions and recommendations of novel diagnostic way will be presented.

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A novel method for Lorentz force detuning compensation in multi-cell superconducting RF cavity and its validation at room temperature

Singh

Jain

Ghodke

et al. 2021

Review of Scientific Instruments

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A tuner is an important element of a superconducting radio frequency (SCRF) cavity, which is used to tune the cavity at resonance frequency. The measurement and control of the pulsed detuning phenomenon is very challenging and can be measured in the superconducting state of the cavity at a high voltage gradient. This paper describes an innovative method and unique approach for the measurement of dynamic changes in resonance frequency of the SCRF cavity even at room temperature. For this purpose, a 1.3 GHz nine-cell prototype dressed cavity with RRCAT’s designed X-link tuning device is used. A test setup for measurements of dynamic changes in resonance frequency of the RF cavity has been designed and developed. The cavity response for piezo-excitation at various pulse widths has been determined. In order to simulate the Lorentz force detuning (LFD) effect, the source frequency has been modulated similar to the superconducting scenario in the SCRF cavity. To compensate the simulated detuning, a fast tuner is operated with half sinusoidal pulses at various combinations of pulse width and time advance to find out an optimum waveform. This optimized waveform will be used with a fast tuning control system to control LFD under actual operation conditions of the SCRF cavity.

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Study of Lorentz force detuning and its compensation in superconducting radiofrequency cavity: A review

Cited by 4 publications

References 7 publications

Formability and surface quality of non-conventional material sheets for the manufacture of highly customized components

Formability and surface quality of non-conventional material sheets for the manufacture of highly customized components

Investigation of X and Y Configuration Modal and Dynamic Response to Velocity Excitation of the Nanometer Resolution Linear Servo Motor Stage with Quasi-Industrial Guiding System in Quasi-Stable State

A novel method for Lorentz force detuning compensation in multi-cell superconducting RF cavity and its validation at room temperature

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