WAKEFIELDS IN COHERENT SYNCHROTRON RADIATION Brant Billinghurst, J. C. Bergstrom, C. Baribeau, T. Batten, L. Dallin, T. E. May, J. M. Vogt, W. Wurtz, R. Warnock, D. A. Bizzozero, S. Kramer, K. Michaelian
Outline People Introduction to Coherent Synchrotron Radiation (CSR) Motivation for Study Observation of Wakefields Using the Far-Infrared Beamline at the CLS
People K. Michaelian Brant Billinghurst Jack Bergstrom Ward Wurtz Les Dallin Tim May D. A. Bizzozero Tonia Batten Johannes Vogt Cameron Baribeau Robert Warnock Steve Kramer
Coherent Synchrotron Radiation Normal Synchrotron Radiation Coherent Synchrotron Radiation
(Ne)2 2a2 Ne2 Power = 3c2 The CSR advantage Bunch with N electrons undergoes acceleration a Random radiation phases (incoherent) Coherent Radiation Phases (Ne)2 2a2 Ne2 Power = 3c2 P[coherent] = N ≈ 106 - 1010 P[incoherent]
CSR Spectrum
Structure in Spectra
The feature of interest
Wakefield In a chamber with conducting side walls Resonant modes of the chamber should exist Energy will be transferred to these modes happens when the phase velocity of the modes match that of the particle This produces a spectra distribution with sharp peaks This is analogous to Whispering Gallery modes
A Different Perspective
Horizontally Polarized, Backward
Vertically Polarized, Backward
Horizontally Polarized, Forward
Time Domain Spectrum
Simulation
More Information
The Far-Infrared Beamline at the CLS S/N up to 8 times better than Conventional Sources Bruker IFS 125 HR Spectrometer capable of resolution better than 0.000976cm-1 2M Gas cell Maximum Pathlength 72M Temperature controlled between 200K and 340 K Horizontal Microscope Coming Soon: Discharge Cell
Discharge Cell
Synchrotron Advantage High resolution spectra of pyrrole, collected using the synchrotron (top) compared to the same using the Globar (bottom). Reproduced from Tokaryk D.W. and van Wijngaarden J.A. "Fourier transform spectra of the ν16 , 2ν16 ,and 2ν16- ν16 bands of pyrrole taken with synchrotron radiation" Can. J. Phys. 87 (2009) 443-448. © Canadian Science Publishing or its licensors
How to Access Beamtime Purchased Access :~$500.00 per hour Peer-Review: $ 1 +tax for each 8 Hour shift A call for proposals for Peer-Reviewed beamtime open twice a year Next call December-June 2017 Opens July 27, 2016 Closes October 7, 2016 Results Announced November 7th 2016
Proposals You can submit a proposal at https://user.lightsource.ca/portal.jsp The proposal includes Users information Brief description Scientific Merit Past productivity Experimental Procedure Sample list Equipment list Safety information Speak to the beamline scientist before submitting a proposal
Remote access Data collected by Beamline staff Users send sample Provide details of the experimental requirements Data is uploaded to an FTP site daily Adjustments to experimental parameters made upon request If you would like to use “remote access” you must Receive confirmation from the beamline scientist that it will be accepted Request 10% more time than usual for said experiment Not Available for High pressure Diamond Anvil Cell work Glow discharge experiments