Abstracts Brochure - CERN

WEPCH182
WEPCH183
WEPCH184
28-Jun-06 16:00 - 18:00 WEPCH — Poster Session
value of about 3.5 x 10 8 W/cm 2 . The implanted samples were characterized by energy dispersive x-ray spectroscopy,
Rutherford backscattering spectrometry and x-ray photoelectron spectrometry. Implantations of Al, Cu and Ge on Si
substrates were carried out up to 80 nm in depth, operating at 40 kV acceleration voltage. Ion dose was estimated by
Faraday cup diagnostics. It was of the order of 10 10 ions/cm 2 per pulse.
Design of 9.4 GHz 950 keV X-band Linac for Nondestructive Testing
T. Yamamoto, T. Natsui, M. Uesaka (UTNL) K. Dobashi (NIRS) T.
Higo (KEK) E. Tanabe (AET Japan, Inc.)
326
Mobile "suit-case-sized" x-band (9.4GHz) 950
keV linac is designed for applications of nondestructive
testing (NDT). Conventional device
for the purpose is the S-band linac, but
its drawback is a rather large device-size, large electron beam spot size of about 3 mm and lack of spatial resolution.
We aim to realize the smaller spot size about 500 micro-m by a low emittance beam. The proposed system consists of
the 9.4 GHz magnetron, modulator, thermionic RF electron gun and 9.4 GHz x-band linac and metal target for x-ray
generation. The energy at the gun is 20 keV, and the final energy becomes 950 keV. Now, we are designing the linac
structure of the pai/2 mode and analyzing the electromagnetic field (EMF) by SUPERFISH. At this time, we finish
analyzing EMF of regular cavity cells and we are analyzing EMF of total accelerating tube. We have finished the
detailed RF design. Further, we are also performing the design of the pai mode and going to discuss the advantages
and drawbacks between them. Construction of the RF supplying system is underway. The detailed design parameters
and updated status of the construction are presented at the spot.
Enhancement of Mechanical Properties of High Chromium Steel by Nitrogen Ion Implantation
B.S. Kim, S.-Y. Lee (New Affiliation Request Pending) K. R. Kim,
J.S. Lee (KAERI)
This article reports the study of mechanical
properties of high chromium steel after Nion
implantation. The samples are implanted
with 120keV N-ion at doses ranging from
1x10 17 ions/square cm to 4x10 18 ions/square cm. Mechanical properties of implanted samples are compared with
those of Cr-plated samples. The compositions of the N-ion implanted layer were measured by Auger electrons spectroscopy(AES).
Their mechanical properties as a function of N-ion doses were characterized by nano-indentation,
sliding and impact wear tests. The results reveal that the hardness and mechanical properties of ion implanted samples
were found to depend strongly on the ion doses. The hardness of the N-ion implanted sample with 2x1018ions/?
was measured to be approximately 9 GPa, which is approximately 2.3 times higher than that of un-implanted sample
(H=3.8 GPa). Also wear properties of N-ion implanted samples with 2x1018ions/? were largely improved ;compared
to the Cr-plated samples, the width of wear track and friction coefficient developed on the N-ion implanted samples
are about 60% and 40% smaller, respectively.
Mechanical Properties of WC-Co by Nitrogen Ion Implantation: Improvement of Industrial
Tools