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group_10 [2018/09/13 16:35] dombos |
group_10 [2018/09/14 09:19] (current) seymour |
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Mres_x = 60.123, and | Mres_x = 60.123, and | ||
Mres_y = 59.262. | Mres_y = 59.262. | ||
- | To have a 5% decrease, the final mass resolutions must be | + | |
- | (60.123-x)/ | + | We adjusted beam parameters until we saw Mres_x |
- | (59.262-y)/ | + | |
The beam position (offsetting the optical axis) can be changed with the '' | The beam position (offsetting the optical axis) can be changed with the '' | ||
Line 107: | Line 106: | ||
With '' | With '' | ||
+ | The beam size can be changed by adjusting the first and fourth parameter of the '' | ||
+ | |||
+ | 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. | ||
+ | |||
+ | 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. | ||
+ | |||
+ | {{ : | ||
+ | {{ : | ||