30Mg run Oct 2007 (25/10->03/11)
Target
issues:
* #367 UCx, MK8
* Mg mass marker
*
* Yield values:
Yield
measurement gave
22/10:
1.8E+06 At/uC (estimated contamination
from 30Al is ~10%)
31/10: 1.0E+06 At/uC (and 9E+04 At/uC without laser)
02/11: >0.5E+6At/uC
(estimate)
The
experiment estimated 1-5E+04/s
Experimental issues:
* Miniball
* IS454
breeding time,
efficiency and currents:
27Al7+ (stable):
Tperiod= 20 ms, Tbreed=12
ms, no gate
Icoll=168.6
mA, Ugun=4000 V
Trap inj plate=8.5 pA, RFQ.FC20(7+)=4.3 pA
Efficiency(Trap+BTS+EBIS+sep, 7+)=7.2%
normal extraction
30Mg7+ (radioactive):
Tperiod=20 ms, Tbreed=14 ms
Icoll=169.4 mA, Ugun=4000 V
With 14/28 pulses, 1.5E+13
ppp
Beam cannot be seen on
FC but can be seen on MCP
normal extraction
Linac
transmission and energy:
For A/q=4 transmission 85% energy 2.86 +/- 0.03 MeV/u
Technical problems:
* XL65.BO60
was not working
Comments and lessons
learned
* always monitor radiation levels around the machine after the
radioactive beam is set-up to have some
reference values during the run
* diamond detector and “collimator” used for the first time at
Miniball to optimize the beam