Superconducting prototype cavities for the Spallation Neutron Source (SNS) project

Ciovati, Gianluigi; Kneisel, P.; Brawley, John; Bundy, R.D.; Campisi, I.E.; Davis, Kirk; Macha, K.; Machie, D.; Mammosser, J.; Morgan, S. E.; Sundelin, R.; Turlington, L.; Wilson, Katherine; Doléans, M.; Kim, Sang-ho; Mangra, D.; Barni, D.; Pagani, C.; Pierini, P.; Matsumoto, K.; Mitchell, R.; Schrage, D.; Parodi, R.; Sekutowicz, J.; Ylae-Oijala, P.

doi:10.1109/pac.2001.987548

Cited by 18 publications

(11 citation statements)

References 3 publications

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“…The stiffening rings of the SNS cavities are included in the β g = 0.47 cavity to reduce microphonic excitation (see Figure 5 above). As mentioned previously, lateral bracing similar to the center support "spider" of the SNS cavities [11,36] is also implemented. The β g = 0.47 cavity is overcoupled to ensure that the gradient can be maintained in the presence of microphonics [27].…”

Section: Frequency Issuesmentioning

confidence: 99%

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805 MHz Beta = 0.47 Elliptical Accelerating Structure R & D

Bricker¹,

Compton²,

Hartung³

et al. 2008

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A 6-cell 805 MHz superconducting cavity for acceleration in the velocity range of about 0.4 to 0.53 times the speed of light was designed. After single-cell prototyping, three 6-cell niobium cavities were fabricated. In vertical RF tests of the 6-cell cavities, the measured quality factors (Q 0 ) were between 7 · 10 9 and 1.4 · 10 10 at the design field (accelerating gradient of 8 to 10 MV/m). A rectangular cryomodule was designed to house 4 cavities per cryomodule. The 4-cavity cryomodule could be used for acceleration of ions in a linear accelerator, with focussing elements between the cryomodules. A prototype cryomodule was fabricated to test 2 cavities under realistic operating conditions. Two of the 6-cell cavities were equipped with helium tanks, tuners, and input coupler and installed into the cryomodule. The prototype cryomodule was used to verify alignment, electromagnetic performance, frequency tuning, cryogenic performance, low-level RF control, and control of microphonics.

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Section: Frequency Issuesmentioning

confidence: 99%

“…Moreover, the Spallation Neutron Source (SNS) is using superconducting elliptical cavities with β = 0.61 and β = 0.81 for the SNS linac. The successful results with multi-cell cavities for SNS [11], as well as several other projects [6,7,8,9], provide a good basis for this technology choice.…”

Section: Introductionmentioning

confidence: 97%

805 MHz Beta = 0.47 Elliptical Accelerating Structure R & D

Bricker¹,

Compton²,

Hartung³

et al. 2008

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“…A preliminary solution aiming to rationalize the cavity end cones is shown in figure 5. This design, originating from the solution adopted by the SNS and TRASCO cavities [5][6], is kept as simple as possible in order to reduce the overall cost and assembly operations. Figure 5: the tuner installed on a modified helium tank As a plus, the axial stiffness is higher than that of the old solution, allowing the transmission of the 90% of the tuner displacements to the cavity, while in the old version the efficiency was only of 83%.…”

Section: Further Improvementsmentioning

confidence: 99%

Improved design of the ILC blade-tuner for large scale production

Pagani

Bosotti

Panzeri

2007

2007 IEEE Particle Accelerator Conference (PAC)

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The ILC superconducting linacs ask for the use of a compact and cost effective tuner design with no interference with the cavity end group area. The integration of the piezo-assisted fast tuning option made the Blade-Tuner, successfully tested at DESY on the superstructures, the most viable candidate to be included into the ILC BCD. In the perspective of large scale production and on the basis of the experience acquired so far, two alternative prototypes have been recently designed and built. They mainly differ for the materials adopted (titanium or stainless steel) and have been optimized to minimize material and construction cost, while fulfilling the reviewed performances required for the high gradient cavity operation up to 35 MV/m or even higher. In this paper we discuss the rationales that brought us to the current solutions, together with a critical comparison of the two systems behaviour and cost. AbstractThe ILC superconducting linacs ask for the use of a compact and cost effective tuner design with no interference with the cavity end group area. The integration of the piezo-assisted fast tuning option made the Blade-Tuner, successfully tested at DESY on the superstructures, the most viable candidate to be included into the ILC BCD.In the perspective of large scale production and on the basis of the experience acquired so far, two alternative prototypes have been recently designed and built. They mainly differ for the materials adopted (titanium or stainless steel) and have been optimized to minimize material and construction cost, while fulfilling the reviewed performances required for the high gradient cavity operation up to 35 MV/m or even higher.In this paper we discuss the rationales that brought us to the current solutions, together with a critical comparison of the two systems behavior and cost.

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“…The cavity design maximizes E acc assuming E peak = 27.5 MV/m, and uses four dies to prevent higher fields in the end cells [3]. We chose a six-cell design to limit the RF power loading in the Fundamental Power Coupler.…”

Section: Cavity Designmentioning

confidence: 99%

The SNS superconducting linac system

Rode

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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The SNS has adopted superconducting RF technology for the high-energy end of its linac. The design uses cavities of β = 0.61 and 0.81 to span the energy region from 186 MeV up to a maximum of 1.3 GeV. Thirty-three of the lower β cavities are contained in 11 cryomodules, and there could be as many as 21 additional cryomodules, each containing four of the higher β cavities, to reach the maximum energy. The design uses a peak surface gradient of 35 MV/m. Each cavity will be driven by a 550 kW klystron.Cryomodules will be connected to the refrigerator by a pair of "tee" shape transfer lines. The refrigerator will produce 120 g/sec of refrigeration at 2.1 K, 15 g/sec of liquefaction at 4.5 K, and 8,300 W of 50 K shield refrigeration.

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Superconducting prototype cavities for the Spallation Neutron Source (SNS) project

Cited by 18 publications

References 3 publications

805 MHz Beta = 0.47 Elliptical Accelerating Structure R & D

805 MHz Beta = 0.47 Elliptical Accelerating Structure R & D

Improved design of the ILC blade-tuner for large scale production

The SNS superconducting linac system

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