Difference between revisions of "Emittance/TWISS parameter extraction"
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Y plot and the GUI with results for the first quad scan. | Y plot and the GUI with results for the first quad scan. | ||
[[File:ISU_1.jpeg|200px|thumb|left|Y beam size squared vs K1*L]] | [[File:ISU_1.jpeg|200px|thumb|left|Y beam size squared vs K1*L]] | ||
| − | [[File:ISU_2.jpeg|200px|thumb| | + | [[File:ISU_2.jpeg|200px|thumb|center|CEBAF graphical emittance tool with Y data and results shown]] |
| + | |||
| + | ---- | ||
X plot and the GUI with results for the second quad scan. | X plot and the GUI with results for the second quad scan. | ||
[[File:ISU_3.jpeg|200px|thumb|left|X beam size squared vs K1*L]] | [[File:ISU_3.jpeg|200px|thumb|left|X beam size squared vs K1*L]] | ||
| − | [[File:ISU_4.jpeg|200px|thumb| | + | [[File:ISU_4.jpeg|200px|thumb|center|CEBAF graphical emittance tool with X data and results shown]] |
| + | |||
| + | {| | ||
| + | | || emittance|| beta ||alpha | ||
| + | |- | ||
| + | | || (m-rad) || (m) || | ||
| + | |- | ||
| + | |X quad scan1 || 1.3e-6 || 0.35 || 2.0 | ||
| + | |- | ||
| + | |Y quad scan0 || 3.7e-6 || 0.41 || 2.3 | ||
| + | |} | ||
| + | |||
| + | |||
| + | == Discussion == | ||
| + | Since this was a more or symmetric setup the agreement for X and Y beta's/alpha's is encouraging. The emittance agreement is within a factor of two which isn't such an alarming discrepancy. A factor of two agreement for a CEBAF measurement is considered a success, but we have an asymmetric complicated machine. | ||
| + | |||
| + | |||
| + | |||
| + | [[Emittance_Test]] | ||
Latest revision as of 21:10, 22 October 2010
Using the perl/PDL script, beam sizes for Y (quad scan 0) and X (quad scan 1) were measured. These beam sizes were put into a "sdds" file so the nominal CEBAF emittance/TWISS tool could be used to plot and fit the data.
Two fits are performed a simple Least Squares Fit and one based on MINUIT. The LSF is also used to seed the MINUIT fit.
Y plot and the GUI with results for the first quad scan.
X plot and the GUI with results for the second quad scan.
| emittance | beta | alpha | |
| (m-rad) | (m) | ||
| X quad scan1 | 1.3e-6 | 0.35 | 2.0 |
| Y quad scan0 | 3.7e-6 | 0.41 | 2.3 |
Discussion
Since this was a more or symmetric setup the agreement for X and Y beta's/alpha's is encouraging. The emittance agreement is within a factor of two which isn't such an alarming discrepancy. A factor of two agreement for a CEBAF measurement is considered a success, but we have an asymmetric complicated machine.