| Autor: |
T.M. Jenkins, W.P. Swanson, W.V. Hassenzahl, W. R. Nelson, Yoshihito Namito |
| Rok vydání: |
1990 |
| Předmět: |
|
| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 291:378-382 |
| ISSN: |
0168-9002 |
| DOI: |
10.1016/0168-9002(90)90090-s |
| Popis: |
Electrons that are lost from the beam during normal operation of a synchrotron radiation source and during a beam dump at the end of a run produce both ionizing radiation and neutrons. This radiation has the potential of damaging sensitive materials, in particular those that need to be very close to the beam. In the wigglers and undulators for the Advanced Light Source (ALS) at LBL, magnetic materials such as the very-high-performance neodymium-iron-boron will be as close as 1 cm away from the electron beam during operation. This material, which is preferred because of its high remanence, is known to be more sensitive to radiation than some other magnetic materials. Simple energy loss estimates and the EGS4 code were used to estimate the radiation levels in the ALS insertion devices in the regions of the magnetic materials. The radiation levels were estimated for both aluminum and stainless steel vacuum chambers to determine if one would provide significantly better shielding. We conclude that NdFeB can be used in the ALS insertion devices and that there is little difference in the radiation levels for aluminum and stainless steel vacuum vessels. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
