Paper | Title | Page |
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TUPTB036 | Equidistant Optimization of Elliptical SRF Standing Wave Cavities | 480 |
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A record accelerating rate was achieved earlier in standing wave (SW) SRF cavities when their shape was optimized for lower peak surface magnetic field. In view of new materials with higher limiting magnetic fields, expected for SRF cavities, in the first line Nb₃Sn, the approach to optimization of cavity shape should be revised. A method of equidistant optimization, offered earlier for traveling wave cavities is applied to SW cavities. It is shown here that without limitation by magnetic field, the maximal accelerating rate is defined to a significant degree by the cavity shape. For example, for a cavity with the aperture radius Ra = 35 mm the minimal ratio of the peak surface electric field to the accelerating rate is about Epk/Eacc = 1.54. So, with the maximal surface field experimentally achieved Epk ¿ 125 MV/m, the maximal achievable accelerating rate is about 80 MeV/m even if there are no restrictions by the magnetic field. Another opportunity ¿ optimization for a low magnetic field, is opening for the same material, Nb₃Sn, with the purpose to have a high quality factor and increased accelerating rate that can be used for industrial linacs. | ||
Poster TUPTB036 [0.787 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-TUPTB036 | |
About • | Received ※ 15 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 08 July 2023 | |
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TUPTB043 | Development of 3-Cell Traveling Wave SRF Cavity | 517 |
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Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics Traveling wave SRF cavity is a new technology and requires a multi-stage process for development. Concep-tual designs have been proposed to adopt TW resonance in an SRF cavity The early stages of developments have been funded by several SBIR grants to Euclid Techlabs which were completed in collaboration with Fermilab. A 3-cell proof-of-principle TW cavity was fabricated as part of that and demonstrated the TW resonance excita-tion at room temperature. A TW resonance control tuner for the 3-cell was also fabricated and the preliminary tests were performed. Now, the 3-cell cavity is being processed and prepared for the first cryogenic testing. |
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Poster TUPTB043 [1.743 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-TUPTB043 | |
About • | Received ※ 17 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 02 July 2023 | |
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TUPTB044 | Compact Multicell Superconducting Crab Cavity for ILC | 521 |
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Funding: Work supported by the Fermi National Accelerator Laboratory; managed by Fermi Research Alliance, LLC under Contract No. DEAC02-07CH11359 with the U.S. Department of Energy We propose a novel design of a deflecting cavity for the ILC project with low parasitic HOM losses and preserving the beam emittance, which is critical for operation with high beam current intensity. Multiple electrodes immersed in the hollow waveguide form a trapped-mode resonator. The transverse components of the electromagnetic field of the trapped dipole mode induce a transverse kick and efficiently deflect charged particles passing through the cavity. We present a scalable design of a superconducting Quasi-waveguide Multicell Resonator (QMiR) seamlessly connected with a beam vacuum chamber. The cavity is completely open at both ends, which significantly reduces the maximum loaded quality factor of the higher order modes (HOM), avoids complex HOM couplers and thus simplifies the mechanical design of the cavity. The same port is used to feed RF power to the operating mode and to extract the same order modes (SOM). Finally, we estimate the expected cryogenic losses, HOM impedance limits, RF input power required, and frequency tuning for a QMiR cavity designed to operate at 2.6 GHz. |
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Poster TUPTB044 [6.975 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-TUPTB044 | |
About • | Received ※ 19 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 16 July 2023 | |
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WEPWB075 | Impact of Solenoid Induced Residual Magnetic Fields on the Prototype SSR1 CM Performance | 760 |
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Funding: This manuscript has been authored by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. A prototype cryomodule containing eight Single Spoke Resonators type-1 (SSR1) operating at 325 MHz and four superconducting focusing lenses was successfully assembled, cold tested, and accelerated beam in the framework of the PIP-II project at Fermilab. The impact of induced residual magnetic fields from the solenoids on performance of cavities is presented in this contribution. In addition, design optimizations for the production cryomodules as a result of this impact are highlighted. |
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Poster WEPWB075 [2.429 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-WEPWB075 | |
About • | Received ※ 26 June 2023 — Revised ※ 27 June 2023 — Accepted ※ 28 June 2023 — Issue date ※ 11 July 2023 | |
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WEPWB109 | PI Loop Resonance Control for the Dark Photon Experiment at 2 K using a 2.6 GHz SRF cavity | 847 |
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Two 2.6 GHz cavities are being used for dark photon search at VTS in FNAL. During testing at 2 K the cavities experience frequency detuning caused by microphonics and slow frequency drifts. The experiment requires that the two cavities have the same frequency within 5 Hz. These two cavities are equipped with frequency tuners consisting of three piezo actuators. The piezo actuators are used for fine-fast frequency tuning. A PI loop utilizing the piezos was used to maintain both cavities at the same frequency, and the results are presented. | ||
Poster WEPWB109 [1.151 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-WEPWB109 | |
About • | Received ※ 16 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 27 June 2023 — Issue date ※ 18 July 2023 | |
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THIXA07 |
Compact, High-Power Superconducting Electron Linear Accelerators for Environmental and Industrial Applications: Projects and Status | |
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We have developed and demonstrated a novel superconducting accelerator technology ¿ conduction cooling - that eliminates the need for liquid Helium, thus dramatically simplifying the infrastructure needed to access SRF technology for industrial applications. Our machine combines R&D breakthroughs in high-temperature SRF cavities (Nb₃Sn), cost-effective radio-frequency sources, modern technology cryo-coolers, and high-average current electron guns. We will describe currently active conduction-cooled accelerator projects at 650 MHz and 1.3 GHz. We will also present the experimental results on the conduction cooling of SRF cavities and briefly discuss results from other labs. Our compact linac is designed to generate electron beam energies up to 10 MeV in continuous-wave operation. Our detailed thermal, RF, and beam transport simulations show that a single accelerator module can deliver average beam power as high as 250 kW. We can reach up to 1 MW by combining several modules. Compact and light enough to mount on mobile platforms, our machine will enable applications such as treating contaminants in water, innovative pavement construction, and X-ray medical device sterilization. | ||
Slides THIXA07 [3.113 MB] | ||
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FRIBA04 | Crab Cavities for ILC | 990 |
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For the 14 mrad crossing angle proposed, crab cavity systems are fundamentally anticipated for the viable operation of the International Linear Collider (ILC), in order to maximise its luminosity performance. Since 2021, a specialist development team have been defining optimum crab cavity technologies which can fulfil the operational requirements for ILC, both for its baseline centre-of-mass energy of 250 GeV, but also extending those requirements out to higher beam collision intensities. Five design teams have established crab cavity technology solutions, which have the capability to also operate up to 1 TeV centre-of-mass. This presentation showcases the key performance capabilities of these designs and their associated benefits for both manufacture and integration into the ILC Interaction Region. The recommended outcome of the recently conducted crab cavity technology down-selection, will also be highlighted. | ||
Slides FRIBA04 [2.526 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-FRIBA04 | |
About • | Received ※ 19 June 2023 — Revised ※ 25 June 2023 — Accepted ※ 27 June 2023 — Issue date ※ 20 July 2023 | |
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