| Paper |
Title |
Page |
WG5001 |
Proposal of a Diamond-based Beam Halo Monitor for an Energy Recovery Linac |
|
| |
- H. Aoyagi, T. Bizen, T. Itoga, N. Nariyama
JASRI/SPring-8, Hyogo, Japan
- Y. Asano, H. Kitamura, T. Tanaka
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
|
|
| |
Funding: This work is partly supported by Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (c) 21604017.
We propose a diamond-based beam halo monitor for an Energy Recovery Linac (ERL). Diamond detectors are operated in photoconductive mode, and installed in a beam duct to measure the intensity of the beam halo directly. Pulse-by-pulse measurement is adopted to suppress the background noise efficiently. The lower detection limit of 2·103 electrons/pulse for single-shot measurement has been achieved. This monitor had been originally developed for SPring-8 Angstrom Compact free electron LAser (SACLA) to prevent radiation damage of undulator magnets, and good performances have been provided until now. The diamond-based beam halo monitor should be useful to control the beam and avoid the unnecessary radiation damage of the components of ERL. Based on the feasibility tests and the operational results of this monitor at SACLA, we will discuss the possibility of the monitor to adapt to the ERL system.
|
|
|
Slides WG5001 [2.808 MB]
|
|
| |
| WG5005 |
Brief Review of the Approaches to Elucidate the Mechanism of the Radiation-induced Demagnetization |
121 |
| |
- T. Bizen
JASRI/SPring-8, Hyogo, Japan
|
|
| |
Permanent magnets decrease their magnetic field under severe radiation environment. This radiation damage, radiation-induced demagnetization, is a great concern especially for the devices that requires very precise uniform magnetic field such as undulators. The evaluation of this field degradation is difficult because the mechanism of the radiation 'induced demagnetization is not clear. Several approaches to clarify this mechanism have been made. For example, (1) the approach to examine the relations between the field degradation and the environmental factors like magnet shape, temperature and so on, (2) the approach to examine the changes of the microstructures and the properties of the magnet after irradiation, (3) the approach to compare and examine the demagnetization and the computer simulations of radiation. This paper reviews and summarizes these approaches and models briefly. The new point of view to consider the mechanism is also presented.
|
|
|
|
Slides WG5005 [2.232 MB]
|
|
| |