RADIATION DAMAGE TO BSCCO-2223 FROM 50 MEV PROTONS Page: 3 of 7
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FIGURE 2. Samples after irradiation mounted on test supports. The samples are approximately 75 mm long.
Two samples of each tape were mounted on frames. The samples were approximately
75 mm long. Two sets of frames were used, one in front of the other, as shown in FIGURE
1. The rear frame could be dropped out of the beam by pulling a string that was run to a
low-radiation area. Two samples were mounted next to each other, so the vertical beam
size of 10 mm covered the combined 8 mm area. After approximately half of the
irradiation, the rear sample was removed from the beam.
The irradiations were carried out at the LBNL's 88" Cyclotron using 50 MeV
protons. The average beam current was about 5 pA. The beam exited the beam line through
a window into the air. After losing approximately 10 MeV in the window, air and samples,
the beam was stopped in a water-cooled stop. A fan was directed on the samples to keep
them cool. The energy deposited in each sample was 10 W. The total number of protons
delivered was 2 x 1018. After cooling for seven months, the samples could be handled
After cooling, the samples together with one of each that had not been irradiated were
mounted on G10 pieces with Stycast 2850 FT epoxy. The G10 holders have fibers in the
plane of the tape so the thermal contraction of the BSCCO is matched, reducing the stain.
Voltage taps were soft-soldered to the samples approximately 20 mm apart. Wire
separation was measured for each sample to allow extraction of the 1 pV/cm criterion.
Some of the samples are shown in FIGURE 2.
An autoradiogram of the samples was made to determine the irradiated area and each
sample was analyzed using a Ge gamma detector and multichannel analyzer. A prominent
silver-105 gamma line was used to determine the relative activation of each sample. The
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Zeller, A.F.; Ronningen, R.M.; Godeke, Arno; Heibronn, L.H; McMahan-Norris, P. & Gupta, R. RADIATION DAMAGE TO BSCCO-2223 FROM 50 MEV PROTONS, article, November 1, 2007; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc893522/m1/3/: accessed April 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.