Keyword: ECR
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MOP39 Development of Compact Radio Frequency Sources controls, interface, radio-frequency, Ethernet 144
  • M.S. McCallum, A. Lyapin
    JAI, Egham, Surrey, United Kingdom
  Funding: This work is supported by STFC’s Impact Acceleration Account scheme.
Our group is developing a family of compact radio frequency sources aiming to cover 50 MHz to 20 GHz with several models. The primary goal is to provide an alternative to using expensive laboratory generators in permanent installations. In addition, we work towards providing a higher specification than similar telecommunications devices as this is a typical requirement in accelerator instrumentation. We take a minimalistic approach with only a network interface planned, assuming that such a device operates remotely in a large facility. An EPICS interface is in the works for monitoring and control. In this paper, we present the results of rapid prototyping with XMicrowave components. The first measurements show encouraging phase noise performance and spectral purity.
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP39  
About • Received ※ 08 September 2022 — Revised ※ 12 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 02 November 2022
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WEP07 Influence of the Beam Induced Irradiation on the Critical Current Phenomena in Superconducting Elements radiation, electron, FEL, lattice 391
  • J. Sosnowski
    NCBJ, Świerk/Otwock, Poland
  Currently developed nuclear accelerators more and more widely use superconducting elements especially in windings of superconducting electromagnets and current leads to them. These elements are however sensitive to the irradiation caused by primary beam as well as by secondary particles, as it is the case for PolFEL. In the paper it is discussed how this irradiation damages the subtle structure of superconducting materials, leading to columnar defects formation in 2D HTc superconductors. It is analysed, in which way created nano-sized structural defects influence the critical current properties of the superconducting materials, in the process of capturing of the magnetic pancake vortices. Various initial positions of the captured vortices are analysed; their movement leads to potential barrier variations. Influence of the irradiation effects on the current-voltage characteristics of superconductors are investigated then and maximal current density detected as the function of irradiation dose, nano-defects size and physical parameters as magnetic field and temperature.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WEP07  
About • Received ※ 07 September 2022 — Revised ※ 13 September 2022 — Accepted ※ 15 September 2022 — Issue date ※ 11 December 2022
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WEP21 Merits of Pulse Mode Operation of Residual Gas Ionization Profile Monitor for J-PARC Main Ring electron, operation, injection, emittance 434
  • K. Satou, Y. Sato
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • S. Igarashi
    KEK, Ibaraki, Japan
  Funding: Accelerator and Beamline Research and Technology Development for High-Power Neutrino Beams in the U.S.-Japan Science and Technology Cooperation Program in High Energy Physics.
The measurement accuracy of the ionization profile monitor (IPM) of J-PARC main ring (MR) depends on the flatness and stability of the gain of the position-sensitive microchannel plate (MCP). The flatness of the MCP deteriorates after long-term operation; the gain of the central area selectively decreases as the integrated output charge increases. The beam-based calibration, where the local bump shifts the beam and the reconstructing beam profiles determine the gain distribution, is used to calibrate the flatness. The immediate gain drop occurs when the output current from the MCP becomes comparable to the bias current is problematic. This gain drop depends on the bias voltage and the output current; thus, it is difficult to calibrate. A pulsed HV module of 30 kV, which collects ionized electrons and ions, was installed to solve these problems. The pulse mode operation can modulate the averaged output current from the MCP to improve gain stability. Profiles of the intense beam up to 3.3·1013 ppb were measured and compared with those measured by destructive profile monitors in beam transport lines 3’50 BT, and the Abort line. Estimated emittances were consistent at ±20%.
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WEP21  
About • Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 16 October 2022
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