A stability of LCLS linac modulators

Decker, F.‐J.; Krasnykh, A.; Morris, B.; Nguyen, Minh Ngoc

doi:10.1109/ipmhvc.2012.6518840

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…The modulator was upgraded by adding a top-off charging power supply to the PFN that stabilizes the output voltage to be better than 50 ppm. 41 A Phase and Amplitude Detector (PAD) unit 42,43 monitors the rf signal in the gun. A feedback loop stabilizes the rf phase and amplitude in the gun relative to a low-level reference rf signal by adjusting the input to the klystron using a Phase and Amplitude Controller (PAC) unit.…”

Section: Mev Ued System At Slacmentioning

confidence: 99%

Mega-electron-volt ultrafast electron diffraction at SLAC National Accelerator Laboratory

Weathersby

Brown

Centurion

et al. 2015

Review of Scientific Instruments

367

251

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Ultrafast electron probes are powerful tools, complementary to x-ray free-electron lasers, used to study structural dynamics in material, chemical, and biological sciences. High brightness, relativistic electron beams with femtosecond pulse duration can resolve details of the dynamic processes on atomic time and length scales. SLAC National Accelerator Laboratory recently launched the Ultrafast Electron Diffraction (UED) and microscopy Initiative aiming at developing the next generation ultrafast electron scattering instruments. As the first stage of the Initiative, a mega-electron-volt (MeV) UED system has been constructed and commissioned to serve ultrafast science experiments and instrumentation development. The system operates at 120-Hz repetition rate with outstanding performance. In this paper, we report on the SLAC MeV UED system and its performance, including the reciprocal space resolution, temporal resolution, and machine stability. C 2015 AIP Publishing LLC. [http://dx

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Section: Mev Ued System At Slacmentioning

confidence: 99%

Mega-electron-volt ultrafast electron diffraction at SLAC National Accelerator Laboratory

Weathersby

Brown

Centurion

et al. 2015

Review of Scientific Instruments

367

251

View full text Add to dashboard Cite

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“…However, typical applications rarely require further optimization. To contextualise our work, the state of the art for measured phase stability in pulsed RF plants worldwide is compared with the facilities at LNF-INFN (Laboratori Nazionali di Frascati dell'Istituto Nazionale di Fisica Nucleare) in Figure 1, collecting the information reported in [4][5][6][7][8][9]. The histogram is constructed exclusively from published or disseminated measurements of klystron phase jitter, considering RF plants of comparable size and peak power.…”

Section: Introductionmentioning

confidence: 99%

Design and Test of a Klystron Intra-Pulse Phase Feedback System for Electron Linear Accelerators

Piersanti,

Bellaveglia,

Cardelli

et al. 2024

Photonics

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Beam stability and timing jitter in modern linear accelerators are becoming increasingly important. In particular, if a magnetic or radio-frequency (RF) compression regime is employed, the beam time of arrival jitter at the end of the linac can be strictly correlated with the phase noise of the accelerating fields of the RF structure working off-crest. For this reason, since 2008, an RF fast-feedback technique, which acts within each RF pulse, has been successfully employed at LNF-INFN (Laboratori Nazionali di Frascati dell’Istituto Nazionale di Fisica Nucleare) in the SPARC_LAB (Sources for Plasma Accelerators and Radiation Compton with Laser And Beam) facility on S-band ( 2856 MHz) klystrons powered by pulse-forming network (PFN) modulators, as reported in this paper. However, in order to meet the more stringent requirements of plasma wakefield acceleration schemes, some upgrades to this feedback system have been recently carried out. The first prototype has been experimentally tested on a C-band ( 5712 MHz) klystron, driven by a solid-state modulator, in order to investigate the possibility for additional improvement resulting from the inherently more stable power source. In this paper, the design, realization and the preliminary measurement results obtained at SPARC_LAB after such upgrades will be reviewed.

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“…The capacitance value of the decade capacitor is able to be adjusted in decade by switching the combinations of the comprising capacitors. The decade capacitors are components frequently used in electronic and electrical industries, for example, used to adjust the delay time of a voice modulation radio communications circuits [1], used in a circuit for the inductive detection of superconductivity [2], used as a load in characterization of a residual-current circuit breaker [3], used as a compensation element in modulators of an accelerator [4], and used for calibration of capacitance meters and bridges [5].…”

Section: Introductionmentioning

confidence: 99%

An Automated-Switching Precision Decade Capacitor

Hsu

Gong

Huang³

2014

AMM

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A new automated-switching precision decade capacitor for applications in industries was designed and tested. By using coaxial microwave switches, the automated-switching precision decade capacitor can be automatically set by electrical TTL signals controlled by a computer. To prevent capacitance from drifting caused by variations of ambient temperature, the internal temperature of the automated-switching precision decade capacitor was effectively kept constant using a temperature-controlled oven with sufficiently thermal isolation. Furthermore, to fulfil the compact-size requirement for using at a high frequency, SMD capacitors with NP0 dielectric were used. The temperature stabilities and linearity of the automated-switching precision decade capacitor are presented in this paper.

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A stability of LCLS linac modulators

Cited by 6 publications

References 2 publications

Mega-electron-volt ultrafast electron diffraction at SLAC National Accelerator Laboratory

Mega-electron-volt ultrafast electron diffraction at SLAC National Accelerator Laboratory

Design and Test of a Klystron Intra-Pulse Phase Feedback System for Electron Linear Accelerators

An Automated-Switching Precision Decade Capacitor

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