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--- group_10 [2018/09/13 17:06]
moylan
+++ group_10 [2018/09/14 09:19] (current)
seymour
@@ Line 111: / Line 111: @@
 Decreasing these parameters only increases the mass resolution. It seems the smaller the beam spot, the larger the mass resolution.
+b) Adjusting the pitch, roll, yaw, x-position, and y-position of Q2 caused a drop in mass resolution at the mass slits (FP2), right after the Wien filter.  In COSY, "TA" is used to adjust the pitch and yaw, "RA" to adjust the roll, and "SA" to adjust x and y position.  Since the shifts are made relative to the central ray, they must be "undone" directly after the quadruple to prevent the shift form effecting the downstream elements.  The below plots show the relative effects on M_res.  For Q2 the mass resolution is more sensitive to changes in pitch and x-offset.
+{{ :angular_shifts.png |}}
+{{ :position_shifts.png |}}

JINA-CEE ION OPTICS SUMMER SCHOOL: JIOSS 2018