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bam_group [2018/09/13 14:20] hamaker [DAY 4:] |
bam_group [2018/09/13 21:44] (current) hamaker [DAY 4:] |
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===== DAY 1: ===== | ===== DAY 1: ===== | ||
- | 2. We are using the **St. George** recoil separator to study the reaction: | + | 2. We are using the **St. George** recoil separator to study the reactions: |
< | < | ||
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The blue ray has the increase in energy while the red ray has the decrease. | The blue ray has the increase in energy while the red ray has the decrease. | ||
- | **Remember to take the transpose of the transport matrix to extract matrix elements correctly.** | + | **Remember to take the transpose of the transport matrix |
===== DAY 2: ===== | ===== DAY 2: ===== | ||
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Change to: | Change to: | ||
- | MQ 1.03*(LQ3+DLQ3) Q3*QF RQ3; | + | '' |
- | MQ < | + | '' |
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Change drift before Q3 definition from | Change drift before Q3 definition from | ||
- | DL DL6-0.5*DLQ3; | + | '' |
to | to | ||
- | DL DL6-0.5*DLQ3-0.03*(LQ3+DLQ3)/ | + | '' |
Change drift after Q3 definition from | Change drift after Q3 definition from | ||
- | DL DL7-0.5*DLQ3-0.5*DLQ4; | + | '' |
to | to | ||
- | DL DL7-0.5*DLQ3-0.5*DLQ4-.03*(LQ3+DLQ3)/ | + | '' |
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Improved method for changing effective length of Q3: | Improved method for changing effective length of Q3: | ||
------------------------------------------------------------- | ------------------------------------------------------------- | ||
- | Line 545, we have definition DLQ3 := 0.353 - LQ3 | + | Line 545, we have definition |
(This is the difference between measured effective field length and defined effective field length, LQ3) | (This is the difference between measured effective field length and defined effective field length, LQ3) | ||
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Now we just need to change the measured effective length by PMOD*0.353 where PMOD is a variable for % modification, | Now we just need to change the measured effective length by PMOD*0.353 where PMOD is a variable for % modification, | ||
- | Definition of MQ already includes factor DLQ3: MQ LQ3+DLQ3 Q3*QF RQ3; | + | Definition of MQ already includes factor |
- | as do the drifts before and after: DL DL6-0.5*DLQ3; | + | as do the drifts before and after:'' |
------------------------------------------------------------- | ------------------------------------------------------------- | ||
- | Attempt to recover best mass resolution | + | Attempt to recover best mass resolution: |
------------------------------------------------------------- | ------------------------------------------------------------- | ||
- | To do this we will try to fit the strength of Q3. Doing this calculation to 5th order, we are able to recover the initial mass resolution of 59 with a Q3 quad strength of .088. | + | To do this we will try to fit the strength of Q3. Doing this calculation to 5th order, we are able to recover the initial mass resolution of 59 with a Q3 quad strength of .88 which is a 2% decrease in the quad strength. |
------------------------------------------------------------- | ------------------------------------------------------------- | ||
===== DAY 4: ===== | ===== DAY 4: ===== | ||
- | Today we are working on problem 8. We are using the command SA <DX> <DY> to change the beam position. SA <DX> <DY> offsets the optics axis x by DX and y by DY. To 5th order, changing the x offset by .5 mm leads to a 5% change in the mass resolution. Any amount of change of the y offset leads to no change in the mass resolution. This is pretty weird... | + | Today we are working on problem 8. We are using the command |
- | We changed the beam size by changing the values of variables X and Y. By changing | + | We changed the beam size by changing the values of variables X and Y. Increasing |
+ | |||
+ | By adding 2 mm to the lengths of quad 3 and 4 and decreasing the drift lengths after them by 2 mm, we reach a 5% change in the mass resolution. | ||
+ | We can shift optical elements in the x-y plane by placing the SA command before and after the element you are shifting. For instance, if you want to shift a quadrupole in the positive y-direction by 5 mm, you would use the following command: | ||
+ | |||
+ | '' | ||
+ | |||
+ | '' | ||
+ | |||
+ | '' | ||
+ | |||
+ | We used this command to shift quadrupole 3 up by 5 mm which changed | ||
+ | |||
+ | We can use the TA command to rotate the quad about the x and y axes. This has the same syntax as SA. | ||
+ | Rotating about the x-axis by .05° changes the mass resolution by 5%. Rotating about the y-axis by .15° changes the mass resolution by 5%. | ||
+ | |||
+ | To determine how much roll is allowed before changing the mass resolution by 5%, we use the RA command which takes one angle and rotates about the z-axis. An angle 0f 2.3° is allowed. |