schmerge experimental results

Information about schmerge experimental results

Published on November 21, 2007

Author: Lassie

Source: authorstream.com

Content

Injector Experimental Results John Schmerge, SSRL/SLAC April 24, 2002:  Injector Experimental Results John Schmerge, SSRL/SLAC April 24, 2002 Goals Gun Test Facility Layout Transverse Emittance Longitudinal Emittance Future Improvements/Conclusions Experimental Goals:  Experimental Goals Transverse Emittance en < 1.2 mm-mrad (projected) Q = 0.2-1 nC Longitudinal Emittance Dt < 10 ps sg /g < 0.1% Laser sjitter < 1 ps Temporal shape – flat-top Elaser > 100 mJ (UV) GTF Linac and Diagnostics:  3m S-Band SLAC Linac Phosphor Screens & Faraday Cups Solenoid PCRF Gun YAG Screen & OTR Screen Quadrupole Doublet Phosphor Screen Toroids Analyzing Magnet Faraday Cup Phosphor Screen & Energy Filter GTF Linac and Diagnostics GTF Beamline:  GTF Beamline Major Differences between GTF and LCLS Injector:  Major Differences between GTF and LCLS Injector Laser Nd:glass instead of Ti:saphire 20% energy fluctuations Gun Single RF power monitor 10 Hz operation Beamline 90 cm gun to linac drift distance instead of 140 cm Single linac section instead of two No solenoid around the first linac section Published Thermal Emittance for Cu:  Published Thermal Emittance for Cu Emittance Measurement Technique at GTF:  rms spot size calculation using projection cut off at 5% of maximum Background subtracted image Quadrupole Scan Technique Measure beam size vs quadrupole current or strength. Emittance Measurement Technique at GTF pixels counts Emittance vs Charge:  Emittance vs Charge Parameters Egun = 110MV/m gun = 40 Rcat = 1mm Bsol » 2.0kG Elinac = 8.3 MV/m Other Laboratories Published Results:  Other Laboratories Published Results QE vs Position:  QE vs Position QE = 3.6 ± 0.4 10-5 100 MV/m 40° injection Improvements:  Improvements Data Acquisition and Analysis Include space charge (20-25% reduction in reported e) Use OTR screen instead of YAG screen for improved resolution Beamline Optimize gun field ratio and phase (minimum e near 30 degrees) Optimize gun to linac matching Eliminate 15 m focal length quadrupole in solenoid Pulse Shaping Improved transverse profile to reduce slice e Laser temporal pulse shaping to reduce projected e Longitudinal Emittance Measurement:  Booster (vary fbooster) Gun Spectrometer Energy Screen Determine Longitudinal f-Space at Linac Entrance Longitudinal : Measure Energy Spectra vs booster phase Transverse: Measure Beam Size vs quad strength Technique analagous to quadrupole scan of transverse emittance Longitudinal Emittance Measurement Measurements:  Minimum Energy Spread Maximum Energy Correlated Energy Spread DETotal = -ERF cos(fRF) Df = 400 keV or 8 % FWHM PARMELA predicts 2% correlated energy spread Measurements Path to Low Emittance Measurements at the GTF:  Path to Low Emittance Measurements at the GTF Conclusions:  Conclusions 1.5 mm projected emittance with 100 A beam measured at GTF with Gaussian temporal pulse shape Measurements agree with PARMELA simulations Emittance can be further reduced by: Improved laser spatial uniformity Improved solenoid with reduced quadrupole field Optimize gun field, phase and linac matching Emittance will be reduced using flat-top temporal laser pulse shape Including space charge in analysis will reduce the reported emittance Utilize OTR screens with improved resolution

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