Difference between revisions of "Emittance/TWISS parameter extraction"

From New IAC Wiki
Jump to navigation Jump to search
 
(6 intermediate revisions by the same user not shown)
Line 5: Line 5:
 
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|right|CEBAF graphical emittance tool with Y data and results shown]]
+
[[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|right|CEBAF graphical emittance tool with X data and results shown]]
+
[[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.

Y beam size squared vs K1*L
CEBAF graphical emittance tool with Y data and results shown



X plot and the GUI with results for the second quad scan.

X beam size squared vs K1*L
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