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Transverse dynamics of the electron beam for the NANOSCOPIUM setting
Calculations were done with the TRACY III code, for the machine without any insertion device.
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Dynamic aperture on momentum in the middle of the long straight injection section
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Horizontal dynamic aperture off-momentum (4D calulation without synchrotron oscillation) in the middle of the long straight injection section
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Experimental data fot the horizontal dynamic aperture off-momentum, for the bare machine with insertion devices
thpe061.pdf (1.09 MB - pdf) (1.09 MB)Media Folder:
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Energy acceptance (6D calculation with synchrotron oscillation) as a function of the position in the storage ring
On the positive side, the energy acceptance is limited by the high α2 value (α1 = 4.16 10-4 et α2 = 4.5 10-3). On the negative side, the limitation comes from the physical aperture of the vacuum chamber in a short straight section.
The corresponding Touschek lifetime is 47 h, determined with:
• RF voltage = 3 MV,
• current per bunch = 1.26 mA,
• transverse coupling = 1 %,
• bunch length = 6 mm (20 ps).
Vacuum contribution to the lifetime , calculated for an average pressure of 6.10-10 mbar and a total current of 430 mA, is 30 h.
The total lifetime, is calculated to be 18 h for a total current of 430 mA in hybrid mode.
Contact : P. Brunelle: pascale.brunelle@synchrotron-soleil.fr