316 research outputs found
Low emittance lattice design from first principles: reverse bending and longitudinal gradient bends
The well-known relaxed theoretical minimum emittance (TME) cell is commonly
used in the design of multi-bend achromat (MBA) lattices for the new generation
of diffraction limited storage rings. But significantly lower emittance at
moderate focusing properties can be achieved by combining longitudinal gradient
bends (LGB) and reverse bends (RB) in a periodic lattice unit cell. LGBs alone,
however, are of rather limited gain.
We investigate the emittance achievable for different unit cell classes as a
function of the cell phase advance in a most general framework, i.e. with a
minimum of assumptions on the particular cell optics. Each case is illustrated
with a practical example of a realistic lattice cell, eventually leading to the
LGB/RB unit cell of the baseline lattice for the upgrade of the Swiss Light
Source
QUANTITATIVE STUDIES ON TUMOR ENHANCEMENT IN MICE : I. ENHANCEMENT OF SARCOMA I INDUCED BY IgM, IgG1, AND IgG2
The concentration of specific alloantibody in purified mouse immunoglobulin preparations was determined. When passively transferred in adequate doses, IgM, IgG1, and IgG2 antibodies all induced tumor enhancement in allogeneic hosts. IgM and IgG2 antibodies in high concentration led to inhibition of tumor growth. IgM and either IgG1 or IgG2 had additive effects on tumor enhancement. IgG1, but not IgG2, suppressed the inhibitory effect of IgM in high concentration
Spin-resolved electron-impact ionization of lithium
Electron-impact ionization of lithium is studied using the convergent
close-coupling (CCC) method at 25.4 and 54.4 eV. Particular attention is paid
to the spin-dependence of the ionization cross sections. Convergence is found
to be more rapid for the spin asymmetries, which are in good agreement with
experiment, than for the underlying cross sections. Comparison with the recent
measured and DS3C-calculated data of Streun et al (1999) is most intriguing.
Excellent agreement is found with the measured and calculated spin asymmetries,
yet the discrepancy between the CCC and DS3C cross sections is very large
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