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WEOB02 | Commissioning of the Cryogenic Current Comparator (CCC) at CRYRING | 349 | |||
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Funding: Work supported by AVA - Accelerators Validating Antimatter the EU H2020 Marie-Curie Action No. 721559 and by the BMBF under contract No. 5P18SJRB1. Accurate non-destructive measurement of the absolute intensity of weak ion beams (< 1 uA) in storage rings is often restricted to special beam conditions and, even then, is associated with large uncertainties and tedious calibration procedures. However, experiments with rare ions in particular depend on excellent current resolution. In order to make these beams accessible, the Cryogenic Current Comparator (CCC) monitors deviations of the DC beam current on a scale of nA and compares the signal to a calibrated reference current. At the heavy-ion storage ring CRYRING at GSI a CCC prototype for FAIR was installed and first results of the commissioning are reported here. Preceding the operation with beam, a careful design of the beamline helium cryostat was required to provide the stable cryogenic environment needed for CCC operation. Mechanical and electro-magnetic perturbations that interfere with measurement of the beam’s faint magnetic field are suppressed by the internal structure of the system and a superconducting magnetic shield, while the remaining interference can be filtered with adequate signal processing. In this way, a current resolution in the nA range was demonstrated. |
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Slides WEOB02 [1.482 MB] | |||||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2021-WEOB02 | ||||
About • | paper received ※ 03 September 2021 paper accepted ※ 27 September 2021 issue date ※ 06 October 2021 | ||||
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WEPP19 | Bunch Arrival-Time Measurement with Rod-Shaped Pickups on a Printed Circuit Board for X-Ray Free-Electron Lasers | 417 | |||
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Funding: This work is supported by the German Federal Ministry of Education and Research (BMBF) under Contract No. 05K19RO1. The all-optical synchronization system implemented in the European X-ray free-electron laser (EuXFEL) is to receive an upgrade. The modifications are intended to allow operation with consistently high accuracy in a 1 pC mode, which is required for various user experiments. The lower charges, e.g. a factor of 20, lead to a reduced signal strength at the pickups and thus to a decreased resolution. A significant potential for improvement has been identified in a modified pickup structure and transmission network, which provide the transient voltage signal to subsequent parts of the synchronization system. One solution for a broadband pickup structure with short signal paths, large active surfaces and minimum aperture diameter could be achieved by connecting rod-shaped pickups to a combination network on a printed circuit board, which will be mounted in the beamline. In this contribution the proposed design is introduced and analyzed by electromagnetic field simulations. |
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Poster WEPP19 [1.008 MB] | |||||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2021-WEPP19 | ||||
About • | paper received ※ 08 September 2021 paper accepted ※ 27 September 2021 issue date ※ 19 October 2021 | ||||
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