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- W4241391211 abstract "The Advanced Photon Source (APS) Wiggler A is a 2.4-m long device with an 8.5-cm period. It satisfies the requirement of achieving a peak field of 1.0 Tesla in the initial phase of operation. This will result in a critical energy of E{sub c}=32.6 key, and the device will provide radiation in a regime harder than that from the APS bending magnet. With B{sub peak}=1.0 T and {lambda}{sub u}=8.5 cm, the deflection parameter K is about 7.9. This puts the device well in the wiggler regime because the first harmonic radiation from such a device wig be at 0.17 keV, far below the critical energy. The fan of radiation from a wiggler is about 2K/{lambda}1.16 mrad in the horizontal direction, and on the order of 1/{lambda}0.073 mrad in the vertical direction. As such, a K of 7.9 represents a good balance between providing a continuous and smooth spectrum without overly spreading the radiation fan in the horizontal direction. As for the source size, the excursion of the positron beam caused by the wiggler field is given by +(K/{lambda})({lambda}{sub u}/2{pi}) = {plus_minus}7.8 {mu}m, which is negligible compared to the positron beam size in the horizontal direction. Thus, the positron beam completely defines the source size for Wiggler A. Wiggler A has the additional capability of varying the magnetic gap. This gives considerable flexibility to the users in changing its critical energy to lower values. For operation at large gap values, the device can also provide undulator radiation below 4 keV from the first harmonic." @default.
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- W4241391211 date "1993-02-01" @default.
- W4241391211 modified "2023-10-13" @default.
- W4241391211 title "Wiggler A characteristics and specifications" @default.
- W4241391211 doi "https://doi.org/10.2172/10135104" @default.
- W4241391211 hasPublicationYear "1993" @default.
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