STUDIES OF ENERGY RECOVERY LINACS AT ... - CASA
STUDIES OF ENERGY RECOVERY LINACS AT ... - CASA
STUDIES OF ENERGY RECOVERY LINACS AT ... - CASA
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
TABLE 2.1: Normalized transverse emittances measured with the injector set to 56 MeV.<br />
Location ɛx (mm-mrad) ɛy (mm-mrad) Energy (MeV)<br />
Injector 0.120 ± 0.001 0.189 ± 0.005 56<br />
Arc 1 0.434 ± 0.106 0.257 ± 0.008 556<br />
Arc 2 2.393 ± 0.350 2.065 ± 0.037 1056<br />
Extraction 0.588 ± 0.233 1.051 ± 0.396 56<br />
TABLE 2.2: Normalized transverse emittances measured with the injector set to 20 MeV.<br />
Location ɛx (mm-mrad) ɛy (mm-mrad) Energy (MeV)<br />
Injector 0.101 ± 0.004 0.090 ± 0.001 20<br />
Arc 1 0.281 ± 0.013 0.253 ± 0.007 520<br />
Arc 2 0.675 ± 0.284 0.451 ± 0.023 1020<br />
Extraction 0.411 ± 0.039 0.871 ± 0.342 20<br />
the energy recovered beam is of its transverse emittance prior to being sent to the<br />
dump.<br />
section.<br />
The results of all the emittance measurements are discussed in the following<br />
2.4.5 Results<br />
The normalized transverse emittances measured at various locations in the ma-<br />
chine for an injection energy of 56 MeV and 20 MeV are summarized in Table 2.1<br />
and Table 2.2, respectively.<br />
The most striking feature of the measurements is the exceedingly large hori-<br />
zontal and vertical emittance in arc 2 for the 56 MeV injector configuration. While<br />
transverse coupling can cause the projected emittances of one plane to increase at<br />
the expense of the other, the fact that both transverse planes grew by such a large<br />
amount suggests a faulty measurement, rather than a real physical process.<br />
During this particular measurement several tens of centimeters of remnant dis-<br />
persion were observed in arc 2. The source of the dispersion was never clearly<br />
49