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group_secar2.0 [2018/09/11 15:18] plastun |
group_secar2.0 [2018/09/11 16:01] wagner |
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Group SECAR2.0 | Group SECAR2.0 | ||
+ | **DAY1 | ||
+ | **\\ | ||
Reaction: < | Reaction: < | ||
Beam: < | Beam: < | ||
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{{ : | {{ : | ||
+ | **DAY2**\\ | ||
**Emittance measurement**\\ | **Emittance measurement**\\ | ||
Distance between Q7 center and focal plane is 6.085 m. | Distance between Q7 center and focal plane is 6.085 m. | ||
{{ : | {{ : | ||
- | Q7 strenght variation: | + | **Q7 strenght variation:**\\ |
- | |B [T] |Xmax[m] |ap [m] |Brho [Tm] |L [m] |K| | + | |B [T] |Xmax[m] |ap [m] |Brho* [Tm] |L [m] |K| |
|0.02 |2.91E-03 |0.13 |0.8 |0.34 |0.065384615| | |0.02 |2.91E-03 |0.13 |0.8 |0.34 |0.065384615| | ||
|0.01 |2.27E-03 |0.13 |0.8 |0.34 |0.032692308| | |0.01 |2.27E-03 |0.13 |0.8 |0.34 |0.032692308| | ||
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|-0.05 |1.60E-03 |0.13 |0.8 |0.34 |-0.163461538| | |-0.05 |1.60E-03 |0.13 |0.8 |0.34 |-0.163461538| | ||
|-0.06 |2.26E-03 |0.13 |0.8 |0.34 |-0.196153846|\\ | |-0.06 |2.26E-03 |0.13 |0.8 |0.34 |-0.196153846|\\ | ||
+ | |||
+ | *Brho the magnetic rigidity was extracted from COSY by comand CONS(CHIM)\\ | ||
**Fit of the data to parabola** | **Fit of the data to parabola** | ||
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b = 0.0834414129893 \\ | b = 0.0834414129893 \\ | ||
c = 3.506973286e-07\\ | c = 3.506973286e-07\\ | ||
- | Emittance = 3.045387898578198e-07 | + | Double check for beam size calculation in Q7: X_calculated = 3.13mm, X_cosy_read_out = 3.16mm at the Q7 exit.\\ |
+ | Emittance = 3.045387898578198e-07 | ||
+ | Start beam emittance= XX * AX= 0.2 π mm mrad, so the emittance grows from the start to the focal point.\\ | ||
+ | This rmittance grow is possibly due to the optics aberrations. Input COSY file does a 4th-order-calculation. Also the measured points don't fit the parabola ideally, i.e. optics is non-linear.\\ | ||
+ |