Difference between revisions of "Bubble Chamber Beam Test September 2015"
Jump to navigation
Jump to search
| Line 28: | Line 28: | ||
# Determine an initial pressure and temperature with no beam | # Determine an initial pressure and temperature with no beam | ||
# Start with beam at K.E. 6.5 MeV | # Start with beam at K.E. 6.5 MeV | ||
| − | # Increase beam K.E. by 0. | + | # Increase beam K.E. by 0.2 MeV steps all the way to 8.5 MeV |
# Reproduce the overall rate shown above | # Reproduce the overall rate shown above | ||
# At K.E. of 8.5 MeV, increase the chamber threshold by increasing the pressure. Suppress the <sup>14</sup>N(γ,p)<sup>13</sup>C events. | # At K.E. of 8.5 MeV, increase the chamber threshold by increasing the pressure. Suppress the <sup>14</sup>N(γ,p)<sup>13</sup>C events. | ||
| Line 35: | Line 35: | ||
* Measuring rates from <sup>18</sup>O(γ,α)<sup>14</sup>C: | * Measuring rates from <sup>18</sup>O(γ,α)<sup>14</sup>C: | ||
| − | # | + | # Now the chamber is at a new pressure |
| + | # Start with beam at K.E. 6.5 MeV | ||
| + | # Increase beam K.E. by 0.2 MeV steps all the way to 9.2 MeV | ||
| + | # Reproduce the overall rate shown above | ||
Revision as of 18:01, 3 September 2015
Run Plan
- Chamber is filled with natural N2O
- Cross sections:
The cross sections are shown in the following figure:
- Expected rates:
The expected rates are calculated with 3 cm cell thickness and thin radiator.
- The expected rates are shown in the following figure:
- The expected rates from oxygen isotopes are shown in the following figure:
- Run Plan:
- Suppression of 14N(γ,p)13C events:
- Determine an initial pressure and temperature with no beam
- Start with beam at K.E. 6.5 MeV
- Increase beam K.E. by 0.2 MeV steps all the way to 8.5 MeV
- Reproduce the overall rate shown above
- At K.E. of 8.5 MeV, increase the chamber threshold by increasing the pressure. Suppress the 14N(γ,p)13C events.
- Once 14N(γ,p)13C is suppressed, the rate should drop by three orders of magnitude
- Measuring rates from 18O(γ,α)14C:
- Now the chamber is at a new pressure
- Start with beam at K.E. 6.5 MeV
- Increase beam K.E. by 0.2 MeV steps all the way to 9.2 MeV
- Reproduce the overall rate shown above