Status: Structured target resonance Magnetic suppression

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Presentation transcript:

Status: Structured target resonance Magnetic suppression Low-Z LPM, Undulator-rad., Quantum suppression Plans: Heavy ion bremsstrahlung Positron production

STATUS

Structured target resonance 2x20 micron Au/Ta foils separated by 0 – 5000 microns (tolerance about 2 microns) Signal ‘on top of’ about 2.0 (in these units) for separations in microns 120 20 40 100

Measuring the formation length with a micrometer screw.... Structured target resonance Measuring the formation length with a micrometer screw.... Preliminary SPS H4 exp., Sept. 2011

Magnetic suppression If the deflection angle over half a formation length exceeds the ‘emission angle’ which happens for photons: Suppression (crude model): More elaborate theory needed...

Magnetic suppression 10% effect... Material immaterial. Higher fields move effect to higher photon energies. Magnitude insensitive BUT: The effect will not be visible due to LPM suppression! 10% effect...

Magnetic suppression 300% effect! NB! Material immaterial. Higher fields move effect to higher photon energies. Magnitude insensitive 300% effect!

Magnetic suppression MCS Field The effect will not be visible due to LPM suppression!

Low-Z LPM SLAC (1995) and CERN (2001) indicate problems with low-Z targets. Test LPM theory in low-Z targets Analysis in progress (deconvolution of synchr. rad. poses problems)

from Electron/Positron Channeling in a Single Crystal Undulator radiation from Electron/Positron Channeling in a Single Crystal A. Solov’yov, A. Korol, W. Greiner et al. Initially tested (unsuccesfully) by NA63

Undulator radiation MAinz MIcrotron (MAMI) H. Backe, W. Lauth, A. Solov’yov, W. Greiner, U. Uggerhøj, J. Esberg, J.L. Hansen MAinz MIcrotron (MAMI) Il Nuovo Cimento C, 34, 157-165, 2011 Il Nuovo Cimento C, 34, 175-180, 2011

Quantum Suppression

Quantum Suppression Classical: -> 0 => Cb -> infty

Quantum Suppression Analysis in progress ‘Fudge-factor’ normalization MonteCarlo Analysis in progress Factor 2 problem with normalization…

PLANS

Heavy ion bremsstrahlung 33 TeV Pb82+ → Pb82+ γ = 170 Intact projectile Weizsäcker-Williams type calculation Scattering on a single rigid object of charge Ze and mass M Approx. binding energy per nucleon Coherent scattering on Z quasi-free protons each of mass Mp Wavelength corresp. to nuclear size Incoherent scattering on individual quasi-free protons

Heavy ion bremsstrahlung Previous theories Now BS never becomes the dominating mechanism in energy loss

Heavy ion bremsstrahlung Delta-electrons Finite nuclear size

Positron production …studies with aligned crystals – to be used for e.g. CLIC, LHeC previous studies with tungsten High multiplicity and ’low’ energies (10 MeV e+)

Positron production MIMOSA detectors (M. Winter, Strasbourg) Vertex detectors for CLIC (?)

Positron production Applications for funding – 100 kCHF – submitted Funding expected by December 2011 11 MIMOSAs + DAQ delivered February 2012

Status: Structured target resonance Magnetic suppression Low-Z LPM, Undulator-rad., Quantum suppression Plans: Heavy ion bremsstrahlung Positron production