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Procedure to align the double slits

30/11/2015 (folder BACHI/Alignement/Dec2015):
(2X1) L=L=2.19 R=0.56----U=1.4 D=-1.8         ZEROUP=0.887;ZERODOWN=-2.33;ZEROLEFT=1.18;ZERORIGHT=-0.44
(1X1)  L=1.69 R=0.06----U=1.4 D=-1.8
(2X2)  L=2.19 R=0.56----U=1.9 D=-1.3

Jan2014 (folder BACH/Jan2014):....

(5X1) L=3.486,R=2.182;U=1.462,D=-1.987
(2X2) L=1.9,R=0.8;U=1.75,D=-1.3 ZEROUP=0.7;ZERODOWN=-2.3;ZEROLEFT=0.9;ZERORIGHT=-0.2 (29/7/2014)

NOTE: Move UP from high to low values...
1) Set Entrance slit fully open. Determine the zero by moving one of the slits and monitoring Io and finding the position where the counts are half.
2) Once the zero position is found for UP, DOWN, LEFT and RIGHT, open all of them of 0.5mm in order to have a 1x1 opening.
3) Move this 1x1 double slit on a grid of values and measure the ratio of the First to Second harmonic and the intensity of teh First harmonic.
4) Once the best position (highest 1/2 ratio) is found, optimize the pitch of SM1 and SM2, and then x and z.
5) Open the horizontal slit to 5 mm if you want to have high flux (but with higher 2nd harm contamination) or to 1x1 in order to have a better suppression of 2nd harmonics.

NOTE: For the HE undulator a good setting is 2X1 (see files 30/11/2015)
For LE und the beam is broader, so, in order to have the same flux probably it is better a 3x2 configuration.





Last Updated on Monday, 30 November 2015 15:53