Klystron modulator technology challenges for the Compact Linear Collider (CLIC)

Aguglia, Davide; Martins, Carlos Augusto Paiva da Silva; Bastos, M. Cerqueira; Nisbet, D.; Siemaszko, Daniel; Sklavounou, E.; Viarouge, P.

doi:10.1109/ppc.2011.6191626

Cited by 37 publications

(33 citation statements)

References 6 publications

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“…The capacitor bank must be designed such that enough voltage V AB is guaranteed during the whole cycle for a correct operation of the DPAB. Considering a maximal voltage droop of 20% on V AB , the capacitor value C AB can be analytically computed as shown in (3).…”

Section: B Dpab Power Design 1) Capacitor Bank Sizementioning

confidence: 99%

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A novel active bouncer system for klystron modulators with constant AC power consumption

Magallanes

Aguglia

Viarouge

et al. 2013

2013 19th IEEE Pulsed Power Conference (PPC)

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This paper presents the principles and design methodologies of a novel active bouncer system, to be implemented in a transformer-based klystron modulator, which is able to meet two different objectives: 1. Regulate the output pulse voltage flattop, and 2. Attenuate the power fluctuation withdrawn from the AC network. This solution allows the utilization of a standard constant voltage / constant current power supply as a capacitor charger. The solution consists of a 4-quadrant switching converter placed in series with the main capacitor bank (forming a unique element in parallel with the capacitor charger), controlled with specific feed-back loops to achieve the two objectives. The complete design method, including a numerical optimization, of the whole system, is presented in the paper. Analyses of the compromises between the active bouncer specifications and the other modulator sub-components design is presented as well. Abstract-This paper presents the principles and design methodologies of a novel active bouncer system, to be implemented in a transformer-based klystron modulator, which is able to meet two different objectives : 1. Regulate the output pulse voltage flattop, and 2. Attenuate the power fluctuation withdrawn from the AC network. This solution allows the utilization of a standard constant voltage / constant current power supply as a capacitor charger. The solution consists of a 4-quadrant switching converter placed in series with the main capacitor bank (forming a unique element in parallel with the capacitor charger), controlled with specific feed-back loops to achieve the two objectives. The complete design method, including a numerical optimization, of the whole system, is presented in the paper. Analyses of the compromises between the active bouncer specifications and the other modulator sub-components design is presented as well.

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Section: B Dpab Power Design 1) Capacitor Bank Sizementioning

confidence: 99%

“…A new linear accelerator under study at CERN, the Compact Linear Collider (CLIC) [1] [2], requires the design of a new klystron modulator capable of producing 150KV and 160A square shaped pulses with a repetition rate of 50 Hz and a flat-top length of 140 μs [3]. The whole complex will include 1638 modulators of 24 MW peak power each, synchronously operated.…”

mentioning

confidence: 99%

A novel active bouncer system for klystron modulators with constant AC power consumption

Magallanes

Aguglia

Viarouge

et al. 2013

2013 19th IEEE Pulsed Power Conference (PPC)

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“…8 RF power quality directly affects the machine performance; therefore, a pulse-to-pulse repeatability better than ±100 ppm out of the high-voltage modulator is required. 9 This needs to be guaranteed in the range of frequencies 6 kHz up to 5 MHz. For this reason, an ultra-low noise acquisition system was designed and developed at CE RN.…”

Section: Introductionmentioning

confidence: 99%

Enhanced analogue front-end for the measurement of the high state of wide-band voltage pulses with 87 dB common-mode rejection ratio and ±0.65 ppm 1-day offset stability

Arpaïa

Baccigalupi

Martino

2015

Review of Scientific Instruments

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An improved analogue front-end for measuring the high state of trapezoidal voltage pulses with transition duration of 3 μs is presented. A new measurement system, composed by a front-end and the state-of-the-art acquisition board NI PXI-5922, has been realized with improved Common Mode Rejection Ratio (CMRR) of more than 87 dB at DC and 3-sigma stability of }0.65 ppm over 1 day. After highlighting the main design enhancements with respect to state-of-the-art solutions, the CMRR measurement is reported. The output drift due to temperature and humidity is assessed to be negligible. Finally, the worst-case repeatability is measured both with shorted-to-ground inputs and with an applied common-mode voltage of 10 V, which represents the nominal working condition. An improved analogue front-end for measuring the high state of trapezoidal voltage pulses with transition duration of 3 µs is presented. A new measurement system, composed by a front-end and the state-of-the-art acquisition board NI PXI-5922, has been realized with improved Common Mode Rejection Ratio (C M RR) of more than 87 dB at DC and 3-sigma stability of ±0.65 ppm over 1 day. After highlighting the main design enhancements with respect to state-of-the-art solutions, the C M RR measurement is reported. The output drift due to temperature and humidity is assessed to be negligible. Finally, the worst-case repeatability is measured both with shorted-to-ground inputs and with an applied common-mode voltage of 10 V, which represents the nominal working condition. C 2015 AIP Publishing LLC.[http://dx

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“…The grid interface of the drive beam klystron modulators should ensure that a constant power of ~280 MW is drawn from the grid. The specifications of the grid interface and pulse forming system for the CLIC's klystrons is given in [2].…”

Section: Introductionmentioning

confidence: 99%

Optimal power system and grid interface design considerations for the CLICs klystron modulators

Jankovic

Watson

Clare

et al. 2014

2014 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

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The Compact Linear Collider (CLIC) is an electron-positron collider under study at CERN with the aim to explore the next generation of high precision/high energy particles physics. The CLIC's drive beams will be accelerated by approximately 1300 klystrons, requiring highly efficient and controllable solid state capacitor discharge modulators. Capacitor charger specifications include the requirement to mask the pulsed effect of the load from the utility grid, ensure maximum power quality, control the derived DC voltage precisely (to maximize accuracy for the modulators being implemented), and achieve high efficiency and operability of the overall power system. This paper presents the work carried out on the power system interface for the CLIC facility. In particular it discusses the challenges on the utility interface and analysis of the grid interface converters with regards to required functionality, efficiency, and control methodologies. ABSTRACTThe Compact Linear Collider (CLIC) is an electronpositron collider under study at CERN with the aim to explore the next generation of high precision/high energy particles physics. The CLIC's drive beams will be accelerated by approximately 1300 klystrons, requiring highly efficient and controllable solid state capacitor discharge modulators. Capacitor charger specifications include the requirement to mask the pulsed effect of the load from the utility grid, ensure maximum power quality, control the derived DC voltage precisely (to maximize accuracy for the modulators being implemented), and achieve high efficiency and operability of the overall power system. This paper presents the work carried out on the power system interface for the CLIC facility. In particular it discusses the challenges on the utility interface and analysis of the grid interface converters with regards to required functionality, efficiency, and control methodologies.

show abstract

Klystron modulator technology challenges for the Compact Linear Collider (CLIC)

Cited by 37 publications

References 6 publications

A novel active bouncer system for klystron modulators with constant AC power consumption

A novel active bouncer system for klystron modulators with constant AC power consumption

Enhanced analogue front-end for the measurement of the high state of wide-band voltage pulses with 87 dB common-mode rejection ratio and ±0.65 ppm 1-day offset stability

Optimal power system and grid interface design considerations for the CLICs klystron modulators

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