introduction to synchrotron radiation and it’s …...d. attwood 1 introsynchrad_apps2005.ppt...
TRANSCRIPT
IntroSynchRad_Apps2005.pptD. Attwood 1
Introduction toSynchrotron Radiationand it’s Applications
David AttwoodUniversity of California, Berkeley
andCenter for X-Ray Optics
Lawrence Berkeley National Laboratory
(http://www.coe.berkeley.edu/AST/sxreuv)
IntroSynchRad_Apps2005.pptD. Attwood 2
The Short Wavelength Regionof the Electromagnetic Spectrum
(1.1)
IntroSynchRad_Apps2005.pptD. Attwood 3
Characteristic Absorption Edges forAlmost all Elements in this Spectral Region
IntroSynchRad_Apps2005.pptD. Attwood 4
Energy Levels, Quantum Numbers, andAllowed Transitions for the copper Atom
IntroSynchRad_Apps2005.pptD. Attwood 5
Electron Binding Energies, in Electron Volts (eV), for the Elements in their Natural Forms
IntroSynchRad_Apps2005.pptD. Attwood 6
Broadly Tunable Radiation is Needed to Probe the Primary (n = 1 & n = 2) Resonances of the Elements
IntroSynchRad_Apps2005.pptD. Attwood 7
• Surface science
• Magnetic materials
• Materials chemistry
• Environmental sciences
• Protein crystallogrphy
• Biomicroscopy
• Chemical dynamics
Typical Applications of Synchrotron Radiation
IntroSynchRad_Apps2005.pptD. Attwood 8
Bright and Powerful X-Raysfrom Relativistic Electrons
IntroSynchRad_Apps2005.pptD. Attwood 9
Synchrotron Radiationfrom Relativistic Electrons
IntroSynchRad_Apps2005.pptD. Attwood 10
Some Useful Formulas for Synchrotron Radiation
IntroSynchRad_Apps2005.pptD. Attwood 11
Three Forms of Synchrotron Radiation
IntroSynchRad_Apps2005.pptD. Attwood 12
Bending Magnet Radiation Covers a Broad Region of the Spectrum, Including the Primary Absorption
Edges of Most Elements
IntroSynchRad_Apps2005.pptD. Attwood 13
Third Generation Facilities, Like Elettra, Have Many Straight Sections and a Small Electron Beam
IntroSynchRad_Apps2005.pptD. Attwood 14
IntroSynchRad_Apps2005.pptD. Attwood 15
Undulator Radiation from a Small Electron Beam Radiating into a Narrow Forward Cone
is Very Bright
IntroSynchRad_Apps2005.pptD. Attwood 16
An Undulator Up Close
ALS U5 undulator, beamline 7.0, N = 89, λu = 50 mm
IntroSynchRad_Apps2005.pptD. Attwood 17
Undulator Radiation
IntroSynchRad_Apps2005.pptD. Attwood 18
Power in the Central Cone
IntroSynchRad_Apps2005.pptD. Attwood 19
Power in the Central Radiation Cone for Three Soft X-Ray Undulators
IntroSynchRad_Apps2005.pptD. Attwood 20
Power in the Central Radiation Cone for Three Soft X-Ray Undulators
IntroSynchRad_Apps2005.pptD. Attwood 21
Power in the Central Radiation Cone for Three Soft X-Ray Undulators
IntroSynchRad_Apps2005.pptD. Attwood 22
Brightness and Spectral Brightness
IntroSynchRad_Apps2005.pptD. Attwood 23
Spectral Brightness is Useful for Experiments that Involve Spatially Resolved Studies
IntroSynchRad_Apps2005.pptD. Attwood 24
The Transition from Undulator Radiation (K ≤ 1) to Wiggler Radiation (K >>1)
IntroSynchRad_Apps2005.pptD. Attwood 25
Wiggler Radiation
IntroSynchRad_Apps2005.pptD. Attwood 26
Stanford Permanent Magnet Wiggler
LBNL/EXXON/SSRL (1982), SSRL Beamline VI 55 pole (N = 27.5), λW = 7 cm
IntroSynchRad_Apps2005.pptD. Attwood 27
Typical Parameters for Synchrotron Radiation
IntroSynchRad_Apps2005.pptD. Attwood 28
Typical Parameters for Synchrotron Radiation
IntroSynchRad_Apps2005.pptD. Attwood 29
Beamlines are Used to Transport Photons to the Sample, and Take a Desired Spectral Slice
IntroSynchRad_Apps2005.pptD. Attwood 30
A Typical Beamline: Monochromator Plus Focusing Optics to Deliver Radiation to the Sample
IntroSynchRad_Apps2005.pptD. Attwood 31
High Spectral Resolution (meV) Beamline
IntroSynchRad_Apps2005.pptD. Attwood 32
Beamline 7.0 at Berkeley’s Advanced Light Source
IntroSynchRad_Apps2005.pptD. Attwood 33
Time Structure of Synchrotron Radiation
IntroSynchRad_Apps2005.pptD. Attwood 34
Variable Polarization Undulator Radiation
IntroSynchRad_Apps2005.pptD. Attwood 35
What are the Relative Merits?
IntroSynchRad_Apps2005.pptD. Attwood 36
A Single Storage Ring Serves Many Scientific User Groups
IntroSynchRad_Apps2005.pptD. Attwood 37
Some Sample Applications
IntroSynchRad_Apps2005.pptD. Attwood 38
ALS Beamlines After 5 Years
IntroSynchRad_Apps2005.pptD. Attwood 39
ALS Beamlines After 5 Years (continued)
www.als.LBL.govwww-ssrl.slac.stanford.edu
IntroSynchRad_Apps2005.pptD. Attwood 40
IntroSynchRad_Apps2005.pptD. Attwood 41
Lectures Available Over the Web Free
UC BerkeleyUC BerkeleyWebcastWebcast
www.coe.berkeley.edu/AST/sxreuv
AST 210 / EECS 213
(offered Fall 2005,starts Aug. 30, 2 pm PDT,
live over internet plus archived)