09.12.2012 Views

Abstracts Brochure - CERN

Abstracts Brochure - CERN

Abstracts Brochure - CERN

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

WEPLS — Poster Session 28-Jun-06 16:00 - 18:00<br />

Undulator-based Production of Polarized Positrons (SLAC E-166)<br />

An experiment at the Final Focus Test Beam<br />

of the Stanford Linear Accelerator Center<br />

has demonstrated the production of polarized<br />

positrons of 4-7 MeV. A 47-GeV electron<br />

beam created a beam of circularly polarized<br />

photons of 9-MeV endpoint energy on passing<br />

through a 1-m-long pulsed helical undulator<br />

with period 2.4 mm and K-factor 0.15.<br />

Photon and positron polarizations were deduced<br />

from measurements of the asymmetry<br />

K.T. McDonald (PU) G. Alexander, E. Reinherz-Aronis (University<br />

of Tel Aviv) Y.K. Batygin, V. Bharadwaj, G.R. Bower, F.-J. Decker, C.<br />

Hast, R.H. Iverson, J. Sheppard, Z. Szalata, D.R. Walz, A.W. Weidemann<br />

(SLAC) T. Behnke, V. Gharibyan, P. Pahl, R. Poeschl, K.P.<br />

Schuler (DESY) S. Berridge, W. Bugg, Y. Efrimenko (UTK) R. Dollan,<br />

H. Kolanoski (Humboldt Universität zu Berlin) J. Kovermann,<br />

A. Stahl (RWTH) K. Laihem, A. Schaelicke (DESY Zeuthen) A.A.<br />

Mikhailichenko (Cornell University, Department of Physics)<br />

in transmission through magnetized iron absorbers (after reconversion to photons in the case of positrons). The results<br />

are in good agreement with simulations, which confirms that this technique is suitable for use in future electron linear<br />

colliders.<br />

Laser Driven Linear Collider<br />

We represent the details of scheme allowing<br />

long term acceleration with >10GeV/m. The A.A. Mikhailichenko (Cornell University, Department of Physics)<br />

basis of the scheme is a fast sweeping device<br />

for laser bunch. After sweeping the laser bunch has a slope with respect to the direction of propagation. So the<br />

every cell of accelerating structure becomes illuminated locally only for the moment, when the particle is there. Self<br />

consistent parameters allow considering this type of collider as a candidate for post-ILC era.<br />

Wiggler for ILC<br />

We represented the concept of a wiggler<br />

with linear piecewise field dependence. This A.A. Mikhailichenko (Cornell University, Department of Physics)<br />

eliminates nonlinearities in wiggler. This<br />

type of wiggler can be recommended for usage in ILC cooler.<br />

The Effect of Vaccum Vessel Permeability on the Field Quality within Dipole and Quadrupole<br />

Magnets at the Energy Recovery Linac Prototype (ERLP) at Daresbury Laboratory<br />

The Energy Recovery Linac Prototype<br />

(ERLP) is currently under construction at<br />

Daresbury Laboratory in the UK and will<br />

N. Thompson (CCLRC/DL/ASTeC)<br />

serve as a test bed for the investigation of technologies and beam physics issues necessary for the development of<br />

Daresbury Laboratory’s Fourth Generation Light Source (4GLS) proposal. To assist with the material specification of<br />

the vacuum vessels, analyses have been done on the effect of vessel permeability on the magnetic field quality within<br />

quadrupole and dipole magnets. It is found that for dipoles where the specified maximum relative dipole field<br />

variation over the good field region is ± 1x 10 -4 or for quadrupoles where the specified maximum relative gradient<br />

variation is ±1 1x10-3, the transverse size of the good field region decays unacceptably for relative permeability ><br />

351<br />

WEPLS062<br />

WEPLS063<br />

WEPLS064<br />

WEPLS065

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!