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group_10 [2018/09/13 16:09] dombos |
group_10 [2018/09/14 09:19] (current) seymour |
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**Problem 8** | **Problem 8** | ||
- | The mass resolutions of '' | + | As stated in Problem 7, the mass resolutions of '' |
- | In order to have a 5% decrease | + | Mres_x = 60.123, and |
- | (60.123-x)/(60.123) = 0.05 -> x = 57.11685%, and (59.262-y)/(59.262) = 0.05 -> y = 56.2989%. | + | Mres_y = 59.262. |
+ | |||
+ | We adjusted beam parameters until we saw Mres_x and Mres_y drop to around 55. | ||
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+ | The beam position (offsetting | ||
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+ | With '' | ||
+ | |||
+ | With '' | ||
+ | |||
+ | The beam size can be changed by adjusting the first and fourth parameter of the '' | ||
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+ | With these two parameters each changed from the default 0.0015 to 0.0017, Mres_x | ||
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+ | Decreasing these parameters only increases the mass resolution. It seems the smaller the beam spot, the larger the mass resolution. | ||
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+ | 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, " | ||
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+ | {{ : | ||
+ | {{ : | ||
- | The beam position (offsetting the optical axis) can be changed with the '' |