Modeling and measurement of {mu}-metal shielding effect on the magnet performance of LCLS undulator.
In a previous paper, we presented results showing that the Earth's field might have a significant effect on the Linac Coherent Light Source (LCLS) undulator performance due to a large concentration of the field by the undulator poles. Based on the result of model calculation, we decided to shield the Earth's field by surrounding the undulator backing structure with a 1-mm-thick {micro}-metal sheet. First, the effect of the shield was modeled using the code RADIA. According to the calculation, the shielding factor of a 'C-shape' {micro}-metal shield was better than a factor of eight. Second, we measured the Earth's field shielding effect without an undulator. In our measurement laboratory, the vertical component of the Earth's field was about 0.5 gauss. It was suppressed down to smaller than 0.1 gauss with the shield. After these background measurements, we examined the effect of the shield with an undulator in place. The measurement results show very good agreement with the model calculation.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 973762
- Report Number(s):
- ANL/ASD/CP-119243; TRN: US1002027
- Resource Relation:
- Conference: 28th International Free Electron Laser Conference (FEL 2006); Aug. 27, 2006 - Sep. 1, 2006; Berlin, Germany
- Country of Publication:
- United States
- Language:
- ENGLISH
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