96Sr run July 2007
Target
issues:
* #355 UC2, MK8, CF4
* Sr and K mass markers
*
* molecular beam 96Sr+19F
* Yield values:
The
experiment estimated ~1E4 Sr/s at Miniball
No
current measured with radioactive beam
At
the beginning 7E5 96Sr+19F/uC; in the end 1.3E5/uC
Experimental issues:
* Miniball
* IS451
breeding time,
efficiency and currents:
88Sr19F (stable):
Tbreed=120 ms, cw injection
into EBIS, Icoll=216 mA, optimised for 23+
Efficiency(Trap+BTS+EBIS+sep, 23+)=1.9%
normal extraction
96Sr19F (radioactive):
25+ beam jumping from 0-90 pA on trap inj plate, 2 to 10 pA on RFQ.FC20, XL65.FC40=1-5 pA (mostly
115In and 115Ag)
27+ 0-0.5pA on RFQ.FC20 (also with trap inj plate in, so probably stable background)
normal extraction
23+ most/part (?) of the
run was carried out with this charge state
linac transmission and energy:
20Ne5+ Aq 4 2.86MeV/u 70%
88Sr23+
Aq
3.826 2.87MeV/u 67%
88Sr21+ Aq 4.190 2.86MeV/u 70%
Technical problems:
* Could not
run 96Sr25+ and 96Sr26+ due to 115In contamination (30+ and 31+). Should have checked beforehand for the presence of stable from Isolde at mass 96+19.
* 7GP2 and
3 tuners were not moving. Adjusted by hand after each
scaling.
* IHS
breaks down above 60kW.
* Poor
transmission between 9GP and
* At the
end of the run attempted Sr98. No beta-decay count at Miniball
Comments and lessons
learned
* 9GP at 90kW (500us 8-30Hz) during entire run without problems.
* Can run
the low energy part with