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Beam-size measurement with optical diffraction radiation at KEK accelerator test facility
Pavel Karataev1, Sakae Araki, Ryosuke Hamatsu
1KEK: High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan. karataev@post.kek.jp
Physical Review Letters
|February 9, 2005
Summary
Researchers explored optical diffraction radiation (ODR) from a slit target for electron beam diagnostics. They achieved the first incoherent ODR observation, demonstrating sensitivity to beam sizes as small as 14 micrometers.
Area of Science:
- Accelerator Physics
- Particle Beam Diagnostics
- Optics and Electromagnetism
Background:
- Noninvasive diagnostics are crucial for optimizing particle accelerators.
- Optical Diffraction Radiation (ODR) is a potential candidate for such diagnostics.
- Previous studies have explored ODR, but its application to precise electron beam-size measurement requires further investigation.
Purpose of the Study:
- To investigate Optical Diffraction Radiation (ODR) from a slit target.
- To assess ODR as a tool for noninvasive electron beam-size diagnostics.
- To measure the effect of beam size on ODR patterns.
Main Methods:
- An experimental setup was installed at the KEK accelerator test facility's extraction line.
- Incoherent ODR was observed from a slit target.
- Angular distributions of ODR were measured and compared with theoretical predictions.
Main Results:
- The first observation of incoherent ODR from a slit target was successfully performed.
- Measured angular distributions showed reasonable agreement with theoretical expectations.
- The experiment demonstrated sensitivity to electron beam sizes as small as 14 micrometers.
Conclusions:
- ODR from a slit target is a viable method for noninvasive electron beam-size diagnostics.
- The observed beam-size effect on ODR angular patterns validates the diagnostic potential.
- The achieved sensitivity highlights ODR's promise for precise beam characterization in accelerators.