Analysis of Thermally Induced Frequency Shift for the Spallation Neutron Source RFQ

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dc.creatorVirostek, S.
dc.creatorStaples, J.
dc.date2000-08-19
dc.date.accessioned2026-07-07T05:44:38Z
dc.date.available2026-07-07T05:44:38Z
dc.descriptionThe Spallation Neutron Source (SNS) Front-End Systems Group at Lawrence Berkeley National Lab (LBNL) is developing a Radio Frequency Quadrupole (RFQ) to accelerate an H- beam from 65 keV to 2.5 MeV at the operating frequency of 402.5 MHz. The 4 section, 3.7 meter long RFQ is a 4 vane structure operating at 6% duty factor. The cavity walls are made from OFE Copper with a GlidCop outer layer to add mechanical strength. A set of 12 cooling channels in the RFQ cavity walls are fed and controlled separately from 4 channels embedded in the vanes. An ANSYS finite-element model has been developed to calculate the deformed shape of the cavity for given RF heat loads and cooling water temperatures. By combining the FEA results with a SUPERFISH RF cavity simulation, the relative shift in frequency for a given change in coolant temperature or heat load can be predicted. The calculated cavity frequency sensitivity is -33 kHz per 1 degC change in vane water temperature with constant-temperature wall water. The system start-up transient was also studied using the previously mentioned FEA model. By controlling the RF power ramp rate and the independent wall and vane cooling circuit temperatures, the system turn-on time can be minimized while limiting the frequency shift.
dc.description3 pages, Linac 200 Conference, Paper ID THD04
dc.identifierhttps://arxiv.org/abs/physics/0008169
dc.identifierhttp://arxiv.org/abs/physics/0008169
dc.identifiereConf C000821 (2000) THD04
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/83716
dc.subjectAccelerator Physics
dc.titleAnalysis of Thermally Induced Frequency Shift for the Spallation Neutron Source RFQ
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