Differences

This shows you the differences between two versions of the page.

--- group_10 [2018/09/13 16:26]
dombos
+++ group_10 [2018/09/13 17:06]
moylan
@@ Line 97: / Line 97: @@
 Mres_x = 60.123, and
 Mres_y = 59.262.
+We adjusted beam parameters until we saw Mres_x and Mres_y drop to around 55.
 The beam position (offsetting the optical axis) can be changed with the ''SA'' command.
@@ Line 104: / Line 106: @@
 With ''SA 0.0 0.0014;'', Mres_x = 55.03721889327960 and Mres_y = 54.24635345218690. This is close to a 5% decrease.
+The beam size can be changed by adjusting the first and fourth parameter of the ''SB'' command to change the x- and y-extent respectively.
+With these two parameters each changed from the default 0.0015 to 0.0017, Mres_x and Mres_y each drop to about 55. A 0.2mm increase in size measurably drops the mass resolution.
+Decreasing these parameters only increases the mass resolution. It seems the smaller the beam spot, the larger the mass resolution.

JINA-CEE ION OPTICS SUMMER SCHOOL: JIOSS 2018