Differences

This shows you the differences between two versions of the page.

--- group_secar2.0 [2018/09/11 13:45]
plastun
+++ group_secar2.0 [2018/09/11 16:24]
wagner
@@ Line 1: / Line 1: @@
-Group SECAR2.0
+====== Group SECAR2.0 ======
-Reaction: <sup>45</sup>V(p,γ)<sup>46</sup>Cr\\
+-by Alex, Nadeesha and Louis-
+===== DAY1=====
+==== Getting started =====
+Choosen example reaction: <sup>45</sup>V(p,γ)<sup>46</sup>Cr\\
+⇒important for <sup>44</sup>Ti production rate in core collapse Supernova ([[https://www.sciencedirect.com/science/article/pii/S0375947403008704|Horoi et al. Nucl.Phys.A 718, (2003)]])\\
 Beam: <sup>45</sup>V<sup>13+</sup> of 135 MeV (1% enegry spread)\\
 {{ :dipole.png?300 |}}\\
-Matrix:\\
+====Understanding COSY Matrix output====
+Command: OV 1 1 0 ; {order 1, phase space dim 1 INCLUDING ENERGY, # of parameters 0}\\
+Output:\\
 |1.0|0.0|0.0|0.0|-0.41|
 |2.2|1.0|0.0|0.0|-0.35|\\
+Explanation:
+|R<sub>11</sub>|R<sub>12</sub>|0.0|0.0|R<sub>15</sub>|
+|R<sub>21</sub>|R<sub>22</sub>|0.0|0.0|R<sub>25</sub>|\\
 R<sub>11</sub> = 1.0 is "Magnification", i.e. no magnification provided with the dipole.\\
 R<sub>12</sub> = 0.0 is "Focusing", i.e. no focusing is provided by the dipole.\\
@@ Line 14: / Line 25: @@
 R<sub>25</sub> = -0.35 is ToF difference due to different initial angle.\\
+==== Reaction Kinematics Calculation====
 {{ :reaction_kinematics.png?400 |}}
 Reaction summary for <sup>45</sup>V+p→γ+<sup>46</sup>Cr, Ek(<sup>45</sup>V)=135 MeV\\
 The maximum γ energy is 8.481 MeV. The minimum γ energy is 7.249 MeV.\\
@@ Line 28: / Line 40: @@
 {{ :dipole46cr13.png?400 |}}
+**DAY2**\\
 **Emittance measurement**\\
 Distance between Q7 center and focal plane is 6.085 m.
+{{ :emittance.png?400 |}}
+**Q7 strenght variation:**\\
+|B [T]	|Xmax[m]	|ap [m]	|Brho* [Tm]	|L [m]	|K|
+|0.02	|2.91E-03	|0.13	|0.8	|0.34	|0.065384615|
+|0.01	|2.27E-03	|0.13	|0.8	|0.34	|0.032692308|
+|0	|1.62E-03	|0.13	|0.8	|0.34	|0|
+|-0.01	|1.20E-03	|0.13	|0.8	|0.34	|-0.032692308|
+|-0.02	|9.08E-04	|0.13	|0.8	|0.34	|-0.065384615|
+|-0.03	|6.23E-04	|0.13	|0.8	|0.34	|-0.098076923|
+|-0.04	|9.54E-04	|0.13	|0.8	|0.34	|-0.130769231|
+|-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|\\
+*Brho the magnetic rigidity was extracted from COSY by comand CONS(CHIM)\\
+**Fit of the data to parabola**
+{{ :plot.png?400 |}}
+a = 0.000362572706 \\
+b = 0.0834414129893 \\
+c = 3.506973286e-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  π m rad= 0.3 π mm mrad.\\
+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.\\

JINA-CEE ION OPTICS SUMMER SCHOOL: JIOSS 2018

User Tools

Site Tools

Differences

Page Tools