Abstract
A short electron bunch with length σ passing through a slit in the diffraction radiation (DR) target generates radiation with a broad spectrum. Optical part of the spectrum (incoherent radiation) may be used for beam size measurements, but in the wavelength range λ ≥ σ radiation becomes coherent. The coherent DR spectrum per each electron in a bunch is equal to single electron spectrum times by the number of electrons in a bunch N e and bunch form factor. For SLAC FFTB conditions (Ne ∼ 1010, σ = 0.7 mm, outer target size R ∼ 10 mm, slit width h ∼ 0.1 mm) we approximated coherent DR (CDR) spectrum by coherent transition radiation (TR) one because in the wavelength region λ ∼ σ ≫ h TR and DR spectra coincide with high accuracy. Changing the DR target by a TR target with projection on the plane perpendicular to electron beam as a circle with radius R ≤ 20 mm we calculated CDR spectra using simple model. Knowing the CDR spectrum we estimated the energy CDR emitting by each electron in the perpendicular direction (due to target inclination angle 45°). It means an electron receives the radiation recoil in this direction. In other words, electron has a transverse kick about 1 μrad that may be considered as permissible. Published by Elsevier B.V.
| Original language | English |
|---|---|
| Pages (from-to) | 170-174 |
| Number of pages | 5 |
| Journal | Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms |
| Volume | 227 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - Jan 2005 |
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Keywords
- Coherent radiation
- Diagnostics
- Diffraction radiation
- Electron beams
ASJC Scopus subject areas
- Surfaces, Coatings and Films
- Instrumentation
- Surfaces and Interfaces
Cite this
Coherent radiation recoil effect for the optical diffraction radiation beam size monitor at SLAC FFTB. / Potylitsyn, A.; Naumenko, G.; Aryshev, A.; Fukui, Y.; Cline, D.; Zhou, F.; Ross, M.; Bolton, P.; Urakawa, J.; Muto, T.; Tobiyama, M.; Hamatsu, R.; Karataev, Pavel Vladimirovich.
In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 227, No. 1-2, 01.2005, p. 170-174.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Coherent radiation recoil effect for the optical diffraction radiation beam size monitor at SLAC FFTB
AU - Potylitsyn, A.
AU - Naumenko, G.
AU - Aryshev, A.
AU - Fukui, Y.
AU - Cline, D.
AU - Zhou, F.
AU - Ross, M.
AU - Bolton, P.
AU - Urakawa, J.
AU - Muto, T.
AU - Tobiyama, M.
AU - Hamatsu, R.
AU - Karataev, Pavel Vladimirovich
PY - 2005/1
Y1 - 2005/1
N2 - A short electron bunch with length σ passing through a slit in the diffraction radiation (DR) target generates radiation with a broad spectrum. Optical part of the spectrum (incoherent radiation) may be used for beam size measurements, but in the wavelength range λ ≥ σ radiation becomes coherent. The coherent DR spectrum per each electron in a bunch is equal to single electron spectrum times by the number of electrons in a bunch N e and bunch form factor. For SLAC FFTB conditions (Ne ∼ 1010, σ = 0.7 mm, outer target size R ∼ 10 mm, slit width h ∼ 0.1 mm) we approximated coherent DR (CDR) spectrum by coherent transition radiation (TR) one because in the wavelength region λ ∼ σ ≫ h TR and DR spectra coincide with high accuracy. Changing the DR target by a TR target with projection on the plane perpendicular to electron beam as a circle with radius R ≤ 20 mm we calculated CDR spectra using simple model. Knowing the CDR spectrum we estimated the energy CDR emitting by each electron in the perpendicular direction (due to target inclination angle 45°). It means an electron receives the radiation recoil in this direction. In other words, electron has a transverse kick about 1 μrad that may be considered as permissible. Published by Elsevier B.V.
AB - A short electron bunch with length σ passing through a slit in the diffraction radiation (DR) target generates radiation with a broad spectrum. Optical part of the spectrum (incoherent radiation) may be used for beam size measurements, but in the wavelength range λ ≥ σ radiation becomes coherent. The coherent DR spectrum per each electron in a bunch is equal to single electron spectrum times by the number of electrons in a bunch N e and bunch form factor. For SLAC FFTB conditions (Ne ∼ 1010, σ = 0.7 mm, outer target size R ∼ 10 mm, slit width h ∼ 0.1 mm) we approximated coherent DR (CDR) spectrum by coherent transition radiation (TR) one because in the wavelength region λ ∼ σ ≫ h TR and DR spectra coincide with high accuracy. Changing the DR target by a TR target with projection on the plane perpendicular to electron beam as a circle with radius R ≤ 20 mm we calculated CDR spectra using simple model. Knowing the CDR spectrum we estimated the energy CDR emitting by each electron in the perpendicular direction (due to target inclination angle 45°). It means an electron receives the radiation recoil in this direction. In other words, electron has a transverse kick about 1 μrad that may be considered as permissible. Published by Elsevier B.V.
KW - Coherent radiation
KW - Diagnostics
KW - Diffraction radiation
KW - Electron beams
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U2 - 10.1016/j.nimb.2004.06.016
DO - 10.1016/j.nimb.2004.06.016
M3 - Article
VL - 227
SP - 170
EP - 174
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
SN - 0168-583X
IS - 1-2
ER -