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group_10 [2018/09/13 15:11] dombos |
group_10 [2018/09/14 09:19] (current) seymour |
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**Problem 7** | **Problem 7** | ||
- | Running '' | + | Running '' |
Mres_x = 60.123, and | Mres_x = 60.123, and | ||
Mres_y = 59.262. | Mres_y = 59.262. | ||
Line 71: | Line 71: | ||
Because we // | Because we // | ||
+ | |||
+ | Near the end of '' | ||
+ | |||
+ | * '' | ||
+ | * '' | ||
+ | * '' | ||
+ | * '' | ||
+ | * '' | ||
+ | |||
+ | were commented out and replaced with | ||
+ | |||
+ | * '' | ||
+ | * '' | ||
+ | * '' | ||
+ | * '' | ||
+ | * '' | ||
+ | * '' | ||
+ | |||
+ | After converging, the fitted value of Q2 is 0.1778619910379541. The original value of Q2 was 0.1828815622086947 (from section '' | ||
+ | This is a (0.1828815622086947 - 0.1778619910379541) / (0.1828815622086947) * 100 = 2.74% decrease. This almost compensates for the 3% increase in the effective field length. | ||
+ | |||
+ | **Problem 8** | ||
+ | |||
+ | As stated in Problem 7, the mass resolutions of '' | ||
+ | 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 '' | ||
+ | |||
+ | 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. | ||
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+ | {{ : | ||
+ | {{ : | ||
+ | |||