W. M. Keck-V in addition to erbilt Free Electron Laser Center Facilities Angular distribution from DR Proposal Studies
Inman, Bradley, Founder and Publisher has reference to this Academic Journal, PHwiki organized this Journal RESEARCH ON BEAM SIZE MONITORS S. Csorna, V in addition to erbilt U. LCCOM2, June 30, 02, Santa Cruz Proposal as long as Non-Intercepting Beam Size Diagnosis Using Diffraction Radiation. Feng/Gabella/Csorna (V in addition to erbilt U.) Laser Interferometry/Laser Wire Studies. Csorna/Ernst/Hartill(V in addition to erbilt,Albany,Cornell) Electro-Optic Technique as long as beam size measurements. Gabella/Feng (V in addition to erbilt U.) Bright Needle Electron Sources. Brau (V in addition to erbilt U.) W. M. Keck-V in addition to erbilt Free Electron Laser Center Facilities College of Arts in addition to Sciences College of Engineering School of Medicine W. Gabella, B. Feng, J. Kozub in addition to D. Piston BiOS 2002 Biomedical Optics in addition to Application, 4633B-31 FEL macropulse: repetition rate: 1-30 Hz electron duration 8 ms IR pulse duration ~ 3-5 ms FEL micropulse: pulse duration ~1 ps pulse separation ~ 350 ps (pulse-to-pulse thermal confinement) FEL pulse structure (Mark-III)
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Proposal as long as non-intercepting beam size diagnosis using coherent diffraction radiation from a slit Advantages: Non-invasive (beam goes through a slit). Easy Extraction of signal since Diffraction Radiation (DR) directed perpendicular to beam if slit inclined at 45 degrees. Responds rapidly to changes in beam, inherently compact, could be installed in many locations. Intensity proportional to 2 In the limit of zero slit width DRTR Bunch length/bunch shape measurement: I()= I1()[N+N(N-1)F()] F() = Bunch Form Factor = S(z)exp[i /c z]dz2 Density Distribution: Asymmetric electron bunch where s is the wave number of radiation, Y(s) the phase calculated from the observed as long as m factor by the Kramers-Kronig relation: In case of asymmetric electron bunch:
Angular distribution from DR Parallel polarization Normal polarization Martin-Puplett Interferometer Electron Beam Coherent Light Beam Dump Detector 2 Detector 1 mirror Parabolic mirror Movable mirror Polarization Splitter S1 S2 Proposal Studies Radiator Longitudinal Bunch Length Experiments Transverse Beam Dimension Experiments Studies of Diffraction Radiation
BUDGET 1. Design, construction in addition to deployment of target/slit 2000.00 2. Wire or graphite polarizer/beam splitter as long as interferometer 5000.00 3. Parabolic reflector (mirror) 1000.00 4. Stage as long as moving mirror in the interferometer 5000.00 5. 2 Golay Cell Detectors (@5000$ each) 10000.00 TOTAL 23,000.00 Laser Interferometer/Laser Wire Studies Transverse beam spot size is determined by using the laser interference fringe as a physical scale. Scan the electron beam through the fringes in addition to measure the Compton scattered g rays from the photon target. The Modulation Depth M = (Signal Max Signal Avg)/Signal Max of the g ray flux is related to the transverse beam size: MUncorrected=½cos q½exp (-(1/2) (2psy /p)2) q= angle between laser beams p=fringe pitch= l/(2 sin(q/2)= p/ky (adjust by changing q or using higher harmonics) Corrections : 1/ Gaussian laser profile 2/ Power imbalance of laser beams can affect contrast 3/ Beta Function of e beam + finite width of laser beam along beam direction, etc. Ref: See KEK preprint 96-81 by Tsumoru Shintake (tutorial) (PRL 74,2479(95)) SLAC FFTB: 70±6 nm
WHAT ABOUT BUNCH LENGTH/BUNCH SHAPE 1/Don Hartill is studying the possibility of using timing in as long as mation to determine bunch length/bunch shape. 2/ Longitudinal beam size can, in principle, be measured by laser heterodyne techniques. This has not been realized experimentally . Principle of Operation: Mix two lasers of different frequency to create an intensity modulation at the beat frequency. If the pitch of the beat wave is longer than the bunch length, large fluctuations will be seen in signal due to each pulse. If the pitch is shorter than the bunch length, the signal will be approximately constant. So you can determine a threshold, which is related to the bunch length.
Scan through relevant beat frequencies, at each frequency measure the difference M. You get: M=(Ngmax – Ngmin)/( Ngmax + Ngmin) = (correction factor as long as laser radius in addition to transverse bunch size) ´ F(wbeat)/F(0) Here F(wbeat) is the Fourier spectrum of the bunch in addition to would look like: Conclusion: It is fairly clear that we need to use laser based techniques to measure nm size bunches; we hope to report a more detailed plan at next UCLC meeting. —————- Electron-Beam Brightness is More Important than Current by Charles A. Brau Department of Physics V in addition to erbilt University
The quantum efficiency as long as 266-nm pulses increases sharply at low fields in addition to approaches unity as long as high fields We have achieved several orders of magnitude improvement in normalized brightness Applications Far Infrared (100-500 mm) FEL UV/Soft X-ray (10-400 nm) FEL Linear Collider Observed currents ~ 100 mA from 0.5-mm tips produce current densities ~ 1011 A/m2 with an estimated normalized brightness ~ 1016 A/m2-steradian
Conclusion: Charley Brau is currently studying the possibility of getting polarized electrons from a needle source. A detailed research plan is to follow
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