High time resolution beam-based measurement of the rf-to-laser jitter in a photocathode rf gun

Zhang, Zhen; Du, Yingchao; Liu, Yan; Du, Qiang; Hua, Jianfei; Shi, Jiaru; Yang, Jin Long; Wang, Dan; Huang, Wenhui; Chen, Huaibi; Tang, Chuanxiang

doi:10.1103/physrevstab.17.032803

Cited by 9 publications

(4 citation statements)

References 30 publications

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“…Our work on strong Coulomb interaction-induced jitter amplification provides an important guide for RF technique-based ultrashort electron pulse generation and precise control where laser-electron synchronization is needed, such as in free-electron lasers [40], the Thomson scattering x-ray source [41], MeV UED [42,43], keV UED [32,37], and UEM [26]. The jitter-amplification effect can be found in MeV UED [44] and before our work, indicative that the mechanism is unambiguous.…”

Section: Summary and Discussionsupporting

confidence: 59%

Coulomb interaction-induced jitter amplification in RF-compressed high-brightness electron source ultrafast electron diffraction

Pei

et al. 2017

New J. Phys.

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Section: Summary and Discussionsupporting

confidence: 59%

Coulomb interaction-induced jitter amplification in RF-compressed high-brightness electron source ultrafast electron diffraction

Pei

et al. 2017

New J. Phys.

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“…Table 2 highlights two main aspects. First, in the on crest case, the PC laser timing-jitter is compressed by a factor c 1 =0.66 in the gun [42], meaning that beam dynamics is mostly determined by the PC laser ( > > c c c 1 2…”

Section: Measurement Of the Atj At Linac Exitmentioning

confidence: 99%

Femtosecond timing-jitter between photo-cathode laser and ultra-short electron bunches by means of hybrid compression

et al. 2016

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The generation of ultra-short electron bunches with ultra-low timing-jitter relative to the photocathode (PC) laser has been experimentally proved for the first time at the SPARC_LAB test-facility (INFN-LNF, Frascati) exploiting a two-stage hybrid compression scheme. The first stage employs RFbased compression (velocity-bunching), which shortens the bunch and imprints an energy chirp on it. The second stage is performed in a non-isochronous dogleg line, where the compression is completed resulting in a final bunch duration below 90 fs (rms). At the same time, the beam arrival timing-jitter with respect to the PC laser has been measured to be lower than 20 fs (rms). The reported results have been validated with numerical simulations.

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“…IV A and IV B are the system selfassessment to characterize the timing and synchronization system performance. Besides, a beam-based method 29 is also applied to measure the jitter between the photocathode driving laser and the RF phase in the photocathode RF gun, which are close loop controlled by the laser synchronization client and LLRF client, respectively. These measurements help us to evaluate the performance of the synchronization system and find the possible jitter source in the whole facility.…”

Section: Beam-based Phase Jitter Measurement Experimentsmentioning

confidence: 99%

Development of sub-100 femtosecond timing and synchronization system

Lin

Yang

et al. 2018

Review of Scientific Instruments

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The precise timing and synchronization system is an essential part for the ultra-fast electron and X-ray sources based on the photocathode injector where strict synchronization among RF, laser, and beams are required. In this paper, we present an integrated sub-100 femtosecond timing and synchronization system developed and demonstrated recently in Tsinghua University based on the collaboration with Lawrence Berkeley National Lab. The timing and synchronization system includes the fiber-based CW carrier phase reference distribution system for delivering stabilized RF phase reference to multiple receiver clients, the Low Level RF (LLRF) control system to monitor and generate the phase and amplitude controllable pulse RF signal, and the laser-RF synchronization system for high precision synchronization between optical and RF signals. Each subsystem is characterized by its blocking structure and is also expansible. A novel asymmetric calibration sideband signal method was proposed for eliminating the non-linear distortion in the optical synchronization process. According to offline and online tests, the system can deliver a stable signal to each client and suppress the drift and jitter of the RF signal for the accelerator and the laser oscillator to less than 100 fs RMS (∼0.1° in 2856 MHz frequency). Moreover, a demo system with a LLRF client and a laser-RF synchronization client is deployed and operated successfully at the Tsinghua Thomson scattering X-ray source. The beam-based jitter measurement experiments have been conducted to evaluate the overall performance of the system, and the jitter sources are discussed.

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High time resolution beam-based measurement of the rf-to-laser jitter in a photocathode rf gun

Cited by 9 publications

References 30 publications

Coulomb interaction-induced jitter amplification in RF-compressed high-brightness electron source ultrafast electron diffraction

Coulomb interaction-induced jitter amplification in RF-compressed high-brightness electron source ultrafast electron diffraction

Femtosecond timing-jitter between photo-cathode laser and ultra-short electron bunches by means of hybrid compression

Development of sub-100 femtosecond timing and synchronization system

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