| Paper | Title | Page |
|---|---|---|
| MOPD25 | Time Domain Pickup Signal characterization for Low Charge Arrival-Time Measurements at FLASH | 209 |
|
||
| For the low charge operation mode at the European XFEL, high bandwidth cone-shaped pickups were developed as a part of the Bunch Arrival-time Monitors (BAMs). The simulation showed that the signal parameters of interest, the signal slope and bandwidth are improved by more than a factor of six compared to the state of the art pickups. The pickups are installed at FLASH for verification. In this paper, time-domain measurements of the cone-shaped pickups at FLASH are presented. The pickup signal is recorded with a high bandwidth sampling oscilloscope. Two channel measurements are conducted with a single and a combined pickup signal in order to analyze the orbit and charge dependence of the pickup signal parameters. The measured time domain pickup signal wave form is compared to the CST PARTICLE STUDIO simulation. | ||
| Export • | reference for this paper to ※ LaTeX, ※ Text, ※ IS/RefMan, ※ EndNote (xml) | |
| WECYB1 | Development of a Modified Six-Port Discriminator for Precise Beam Position Measurements | 495 |
|
||
|
For the European XFEL, new energy beam position monitors based on planar transmission lines were designed for energy measurements in the dispersive section of bunch compressor chicanes. The EBPM consists of transversely mounted stripline pickups in a rectangular beam pipe section and a signal detection scheme which measures the phases of the pulses at the ends of the pickup*. It allows simultaneous measurements of the beam energy and arrival-time. This paper presents the development of a RF readout electronic based on a modified six-port discriminator as a low-cost alternative to the readout electronics based on the MTCA.4 platform for the EBPM. Based on the six-port, the beam position can be determined by means of the phase difference between the received signals from both ends of the transmission line pickup. The six-port discriminator is a linear passive component, first developed in the 70s for accurate measurements of complex reflection coefficients in microwave network analysis**. It typically consists of two hybrid couplers and two power dividers or one Wilkinson power divider and three -3dB hybrid couplers. For the measurement of the difference of two signals excited from a single source one of the hybrid coupler can be omitted. The advantage of the six port is the fact that accurate phase measurements can be performed at microwave and millimeter wave frequencies only by amplitude measurements. This paper shows the principle of operation, developed prototype, and first test results
* A. Penirschke et al., Proceedings of IBIC2013, Oxford, United Kingdom (2013). ** G.F. Engen, IEEE MTT, vol.25, no.12, pp.1077-1079, December 1977. |
||
|
Slides WECYB1 [2.567 MB] | |
| Export • | reference for this paper to ※ LaTeX, ※ Text, ※ IS/RefMan, ※ EndNote (xml) | |