User name Aniol
Log entry time 08:28:53 on March 9,2007
Entry number 195299
keyword=bismuth IscanMCC raster numbers (8,7.4), (4mm,7mm)
I uA T1(Hz) T3(Hz)
5.3 1K 930
10.5 2.1K 1.83K
21 3.95K 3.61K
42 8.41K 7.09K
63.7 13.5K 10.7K
84.6 18.5K 14.4K
The rate on the Bi tgt is bigger than the rate on the Pb tgt.
I(Pb)79uA : T3 = 9.16K
I(Bi)84.6uA: T3 = 14.4K,
rates Bi/Pb = 1.47
We reduced the raster size by a factor of 2 and decreased the current to 20 uA to have the same power density.
MCC raster numbers (4,3.7), (2mm,4mm) The pattern is below.
I T1 T3
21uA 3.95K 3.6K at (4mm,7mm) from above
22uA 5.4K 3.9K at (2mm,4mm)
22uA 4.8K 3.6K at (4mm,7mm) going back to normal raster
Conclusion: Reducing the raster size slightly increases the rate ,so we are not hitting the ladder. I expected the quasielastic rates in T3 to be the same for Bi and Pb since the targets have about the same mass/cm2.
The second raster pattern is for 85 uA run 1326, production on Bi.
FIGURE 1
FIGURE 2
