Mg run
isotopes run: 28,30,32Mg
yields: maybe
a factor 2 precision, 7E6/uC for 30Mg and 1E5/uC for 32Mg
target=700 A, line=300 A
28Al superimposed on 28Mg
breeding time 30Mg7+ 15 ms, 32Mg9+ 18 ms (not optimum), 28Mg9+ (not
optimum)
efficiencies:
trap 40-50% throughout
the experiment
EBIS 15-20% for
30Mg7+, <10% for 32Mg9+; efficiencies measured with 24Mg
28Mg9+ 17.7% (on
average 10%), efficiency measured with 28Mg
stable K10+ efficiencies
22% for optimum breeding time
Linac somewhat
unclear, estimated 80% for 30Mg7+
Total efficiency
for 30Mg7+ ~6%.
With ~2 uC/s =>
1.4E7 30Mg/s from the ISOLDE target and 8E5 30Mg/s on Miniball target
current after trap and ebis: 5 pA
on injection plate, 28Mg9+ average 4 pA at A/q=3.11111
technical problems:
water
leak EBIS
breaking
target on
beam
diagnostics FEC
computer
control of Linac broke down
comments: beam setup with K beam, high
breeding efficiency 22% K10+
lesson: keep the trap on same voltage as last run
=> retain same injection parameters into the EBIS