We measured the breeding efficiency of Li-like ions in the ESR and the rates are way below the expected 25%.
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breeding time (min) | # after injection | # after breeding | efficiency
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1 | 1,48E+07 | 4E+05 | 0,0270
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2 | 1,33E+07 | 5E+05 | 0,0376
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3 | 1,37E+07 | 6E+05 | 0,0438
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4 | 1,38E+07 | 6E+05 | 0,0435
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6 | 1,40E+07 | 7E+05 | 0,0500
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8 | 1,46E+07 | 8E+05 | 0,0548
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10 | 2,31E+07 | 12E+05 | 0,0519
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15 | 1,44E+07 | 8E+05 | 0,0556
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All measurements were taken with 1 single injection.
Edited by Carsten 2025-05-11:
A word of caution: Due an offset of the current transformer that changes easily with time I would question any reading below 1e6 ions. Even at 1e6 the error could vary from easily by 20 (?) percent.
Secnd comment: The efficiency cannot be deduced that way because before decelartion and scraping we have still a lot of contaminents in the ring. For a correct assesment we would need to have He-like only beam.
Third, the saturation after almost after 3 mins 4% close to max 5.5% looks very suspicious to me. One should definately have closer look here.
In the morning shift we remeasured the breeding efficiency. We stacked 8 times to have a higher ion current in the ESR. Then we waited 40 min
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breeding time (min) | # after injection | # after breeding | efficiency
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40 | 6.2E+07 | 2.4E+06 | 0,039
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