Piezoelectric actuator based phase locking system to improve the dynamics of the control scheme for a heavy ion superconducting linac

Sahu, Biswamitra; Ahuja, R.; Kumar, Rajesh; Suman, Saket; Mathuria, D.S.; Rai, Abhishek; Patra, P.; Pandey, Ashutosh; Karmakar, J.; Chowdhury, G.K.; Dutt, R.N.; Joshi, Gopal; Ghosh, Santanu; Kanjilal, D.; Roy, A.

doi:10.1016/j.nima.2014.12.096

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…Piezoelectric tuners are widely studied for elliptical cavities. However, the possibility of using piezoelectric fast tuners to perform high speed mechanical tuning in feedback and correct also the cavity mechanical resonant modes at several tens of Hz have been demonstrated also in QWRs [61,102,103]. Although rarely implemented until now in operational HI SC low-β linacs, piezoelectric fast tuning is often present in proposals for future low-β accelerators.…”

Section: Fast Tunersmentioning

confidence: 99%

“…Problems of microphonics, limiting the cavity performance to below the design gradient of 4 MV m −1 [94], have been recently tackled and solved. Critical improvements were the addition of a special mechanical damper based on spheres located in the inner conductor [35], upgrade of the ANL type pneumatic tuner [142] and the addition of a piezoelectric tuner to compensate for non-resonant detuning [103]. SC linac with 100 low-β resonators of three different types (see table 3).…”

Section: Iuac Linac Qwrs Upgradesmentioning

confidence: 99%

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Low- to medium-β cavities for heavy ion acceleration

Facco¹

2016

Supercond. Sci. Technol.

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Acceleration of low- and medium-β heavy ions by means of superconducting (SC) linear accelerators (linacs) was made possible by the development, during four decades, of a particular class of cavities characterized by low operation frequency, several different shapes and different electromagnetic modes of operation. Their performance, initially rather poor in operating accelerators, have steadily increased along with the technological progress and nowadays the gap with the high-β, elliptical cavities is close to be filled. Initially confined to a very small number of applications, this family of cavities evolved in many directions becoming one of the most widespread in linacs. Nowadays it is present in the majority of superconducting radio-frequency ion linac projects worldwide. An overview of low- and medium-β SC cavities for heavy ions, focused on their recent evolution and achievements, will be given.

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Section: Fast Tunersmentioning

confidence: 99%

Section: Iuac Linac Qwrs Upgradesmentioning

confidence: 99%

Low- to medium-β cavities for heavy ion acceleration

Facco¹

2016

Supercond. Sci. Technol.

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“…Smart material based actuators are new types of actuators different from the traditional electromagnetic actuators. Among these smart actuators, the piezoelectric actuator is widely used in the field of micro-/nano-positioning and manipulation [1][2][3][4][5][6], biomedical robotics and extreme environments [7][8][9][10] and optics [11][12][13] due to its extraordinary characteristics such as nanometer-scale displacement resolution, nonexistent friction and fast response.…”

Section: Introductionmentioning

confidence: 99%

Hysteresis Modelling and Feedforward Control of Piezoelectric Actuator Based on Simplified Interval Type-2 Fuzzy System

Zhang

et al. 2020

Sensors

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The piezoelectric actuator is indispensable for driving the micro-manipulator. In this paper, a simplified interval type-2 (IT2) fuzzy system is proposed for hysteresis modelling and feedforward control of a piezoelectric actuator. The partial derivative of the output of IT2 fuzzy system with respect to the modelling parameters can be analytically computed with the antecedent part of IT2 fuzzy rule specifically designed. In the experiments, gradient based optimization was used to identify the IT2 fuzzy hysteresis model. Results showed that the maximum error of model identification is 0.42% with only 3 developed IT2 fuzzy rules. Moreover, the model validation was conducted to demonstrate the generalization performance of the identified model. Based on the analytic inverse of the developed model, feedforward control experiment for tracking sinusoidal trajectory of 20 Hz was carried out. As a result, the hysteresis effect of the piezoelectric actuator was reduced with the maximum tracking error being 4.6%. Experimental results indicated an improved performance of the proposed IT2 fuzzy system for hysteresis modelling and feedforward control of the piezoelectric actuator.

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Piezoelectric actuator based phase locking system to improve the dynamics of the control scheme for a heavy ion superconducting linac

Cited by 2 publications

References 8 publications

Low- to medium-β cavities for heavy ion acceleration

Low- to medium-β cavities for heavy ion acceleration

Hysteresis Modelling and Feedforward Control of Piezoelectric Actuator Based on Simplified Interval Type-2 Fuzzy System

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