| Paper | Title | Other Keywords | Page |
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| WEPLM21 | High-Quality Resonators for Quantum Information Systems | SRF, cavity, controls, photon | 690 |
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| We analyze ultra-high-quality factor resonators for quantum computer architectures. As qubit operation requires external DC fields, we started our study with a conventional closed copper cavity which naturally allows external magnetic field. In order to increase quality factor and to keep DC magnetic field control at a level less than critical field, an open SRF resonator promises much higher quality. The next step resonator is a photonic band gap (PBG) resonator. This resonator allows easy external either magnetic or electric field control. It consists of a periodic 3D set of sapphire rods assembled between two superconducting plates. The PBG resonator exploits unique properties of the crystalline sapphire. Tangent delta for sapphire in X-band is reported at 10-9 ’ 10-10 at 4 K. That is why, the Q-factor of the sapphire PBG resonator can be expected as high as 10 billions at mK temperatures which provides long relaxation times (dephasing etc.). The established PBG design implies obtaining a large Purcell factor, i.e. large ratio of quality to mode volume which is important parameter to establish strong interaction of a qubit with the cavity mode rather than RF noise. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-WEPLM21 | ||
| About • | paper received ※ 27 August 2019 paper accepted ※ 01 September 2019 issue date ※ 08 October 2019 | ||
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| WEPLM71 | Thermal Performance of FRIB Cryomodules | cryomodule, cavity, solenoid, operation | 759 |
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Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation under Cooperative Agreement PHY-1102511. Now SRF cavity development is advancing high-Q/high gradient by nitrogen doping, infusion, or the new low temperature bake recipe. Once cavity dynamic loss is reduced, the static heat load of the cryomodule will be of concern from the cryogenic plant capability point of view. FRIB gives us a good chance to statistically compare the cryogenic plant design and the measured results, along with a thought for future updated cryomodule design using a low/medium beta cryomodule. FRIB cryomodules have two cooling lines: 4.5 K for solenoids and 2K for cavities. The boil-off liquid helium method was used to measure the cryomodule’s heat load. So far, FRIB has completed certification testing (bunker tests) on 39 of 49 cryomodules (80%). This paper reports the static heat load measurement results, which are important for future FRIB upgrades to estimate remaining cryogenic capability. The cryomodule’s evolution related to heat load is introduced too. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-WEPLM71 | ||
| About • | paper received ※ 05 September 2019 paper accepted ※ 15 September 2019 issue date ※ 08 October 2019 | ||
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| WEPLH19 | Record Fast Cycling Accelerator Magnet Based on High Temperature Superconductor | proton, booster, collider, operation | 845 |
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Funding: Fermi Research Alliance, LLC under contract No. DE-AC02-07CH11359 We report on the prototype High Temperature Superconductor (HTS) based accelerator magnet capable to operate at 12 T/s B-field ramping rate with a very low supporting cryogenic cooling power thus indicating a feasibility of its application in large accelerator requiring high repetition rate and high average beam power. The magnet is designed to simultaneously accelerate two particle beams in the separate beam gaps energized by a single conductor. The design, construction and the power test arrangement of a prototype of this fast-cycling HTS based accelerator magnet are presented. As example, the cryogenic power loss limit measured in the magnet power test is discussed in terms of feasibility of application of such a magnet for the construction of an 8 GeV dual-beam proton booster accelerator. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-WEPLH19 | ||
| About • | paper received ※ 27 August 2019 paper accepted ※ 31 August 2019 issue date ※ 08 October 2019 | ||
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||