RF Control System for the DESY VUV-FEL Linac

Ayvazyan, V.; Petrosyan, G. G.; Rehlich, K.; Simrock, S.; Vetrov, P.

doi:10.1109/pac.2005.1591307

Cited by 7 publications

(7 citation statements)

References 1 publication

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“…The master clock also generates a unique bunch train number for each bunch train which is then distributed to all devices. All measuring devices are connected via ethernet to the central data acquisition system called DAQ [6]. 1 The accumulated data are read out by the computer and send to the DAQ together with the unique bunch train number.…”

Section: Methodsmentioning

confidence: 99%

Photoelectron spectroscopy as a non-invasive method to monitor SASE-FEL spectra

Wellhöfer¹,

Hoeft²,

Martins³

et al. 2008

J. Inst.

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Since the summer of 2005, the vacuum ultra-violet Free-electron LASer in Hamburg (FLASH) has operated as a user facility at the Deutsches Elektronen-Synchrotron (DESY), delivering ultra-short laser pulses of tens of femtosecond duration with a high peak brilliance of up to 10 28 photons/(s mm 2 mrad 2 0.1% bandwidth). Due to the statistics of the Self-Amplified Spontaneous Emission (SASE) process, each photon pulse differs from the previous one in the number of modes per pulse, the wavelength (0.5% fluctuations) and the intensity, making experiments more complicated. Thus, for certain experiments the detailed knowledge of the beam properties on a shot-to-shot basis is mandatory. In this paper we describe an online method to gain spectral information about the individual Free-Electron Laser (FEL) pulses that is based on rare-gas photoionization and photoelectron spectroscopy.

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Section: Methodsmentioning

confidence: 99%

Photoelectron spectroscopy as a non-invasive method to monitor SASE-FEL spectra

Wellhöfer¹,

Hoeft²,

Martins³

et al. 2008

J. Inst.

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“…The control system concept, we would like to implement, is based on that for accelerating modules of FLASH at DESY [6]. A test cavity (copper model) is coupled into the control loop via two antennae.…”

Section: Phase and Amplitude Control Systemmentioning

confidence: 99%

“…The TESLA power coupler for the operation in FLASH has Q ext =3.4*10 6 . We expected that our input coupler could provide Q ext close to Q 0 of the cooper structure.…”

Section: Tm010 Modes' Detuning Caused By Antennasmentioning

confidence: 99%

<title>Copper TESLA structure: measurements and control</title>

Główka

Maciaś

2007

SPIE Proceedings

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“…In the existing low-level radio frequency system at FLASH [1], an 8 channel downconverter based on a low power Gilbert cell mixer and a 14 Bit, 1 MHz sampling ADC is used to detect the RF field of the superconducting cavitites. The intermediate frequency (IF) of 250 kHz is generated by mixing a phase modulated local oscillator (LO) with the 1.3 GHz RF from the cavity.…”

Section: Introduction/motivationmentioning

confidence: 99%

Multichannel downconverter for the next generation RF field control for VUV- and X-ray free electron lasers

Hoffmann¹,

Ludwig²,

Schlarb³

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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For pump-probe experiments at VUV-and X-ray freeelectron lasers, in the injector and bunch compression section the electron beam and timing reference must be in phase within 0.01 degree (rms) and have an amplitude stability within 10 −4 (rms). The performance of the field detection and regulation of the acceleration RF critically influences the phase and amplitude stability. For the RF field control, a multichannel RF downconverter is used to detect the field vectors and control the vector sum of 32 cavities. In this paper a new design of an 8 channel downconverter is presented. The downconverter front-end consists of a passive RF double balanced mixer input stage, intermediate filters, and an integrated 16 Bit analog-to-digital converter (ADC). The design includes a digital motherboard for data pre-processing and communication with the controller. In addition, we characterize the downconverter performance in amplitude and phase jitter, temperature drifts, and channel cross-talk in a laboratory environment.

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RF Control System for the DESY VUV-FEL Linac

Cited by 7 publications

References 1 publication

Photoelectron spectroscopy as a non-invasive method to monitor SASE-FEL spectra

Photoelectron spectroscopy as a non-invasive method to monitor SASE-FEL spectra

<title>Copper TESLA structure: measurements and control</title>

Multichannel downconverter for the next generation RF field control for VUV- and X-ray free electron lasers

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