The elliptical multipole wiggler 0 has been designed, constructed, and installed in the X13 straight section of the NSLS X-ray Ring. The EMW generates circularly polarized photons in the energy range of 0.1-10 keV with AC modulation of polarization helicity. The vertical magnetic field of 0.8 T is produced by a hybrid permanent magnet structure with a period of 16 cm. The horizontal magnetic field of 0.22 T is generated by an electromagnet, the core of which is fabricated from laminated iron to operate with a switching frequency up to 100 Hz. There are dynamic compensation t r i m magnets at the wiggler ends to control the first and second field integrals with very high accuracy throughout the AC cycle. The residual closed orbit motion due to the electromagnet AC operation is discussed.
In December 1994, an elliptically polarized wiggler was installed in the X13 straight section of the NSLS X-ray Ring. This device generates circularly polarized photons in the energy range of 0.1–10 keV with AC modulation of polarization helicity. The vertical magnetic field is produced by a hybrid permanent magnet structure, and the horizontal magnetic field is generated by an electromagnet capable of operating with a switching frequency of up to 100 Hz. The elliptically polarized wiggler was commissioned during spring 1995 at an operating frequency of 2 Hz. Here, we discuss the compensation of the residual-orbit motion-utilizing trim coils at the wiggler ends and the high precision orbit measurement system of the X-Ray ring.
The SPEAR 3 upgrade project at SSRL will replace the original FODO lattice with a 234-m, 18-cell DBA lattice with gradient dipoles. The new hardware draws heavily on PEP-II B-Factory technology: a copper vacuum chamber, IGBT power supply technology, and mode-damped rf cavities to reach beam currents up to 500 mA at 3 GeV. First article magnets, supports, girders, vacuum chambers, pumps and RF components have been fabricated and a prototype girder assembly is nearing completion. I&C systems, radiation shielding and utility upgrades are in progress. In this paper we report on the status of the main accelerator subsystems.
During April, 2003, the SPEAR 2 storage ring, which served the high energy physics community from 1972 to 1987, and the synchrotron radiation community for an additional 15 years, was removed from its shielding tunnel in order to install the new 3-GeV, 500-mA SPEAR 3 light source. From May to November, SSRL will excavate the tunnel floor and pour a new concrete floor, and then install pre-assembled girders holding magnets, copper vacuum chambers, PEP-II-style rf cavities, and beam line front end components. At the same time, power supply, instrumentation and control, and other ancillary systems will be configured, leading to a commissioning period beginning in November 2003. The progress of accelerator component implementation and installation during the final year of the project will be reviewed.
electromagnetic structuri provides a horizontal field change up to 100 Hz with a maximum field of 0.12 T (I= 0.6 kA, Kx= I v MAGNETIC FIELD MEASUREMENTS 1.6). The current pulse has a trapezium-type shape with a switching time to change the current polarity of about 2 m. The measurements and tuning were done for direct current (DC) mode and alternating current (AC) mode. Fine adjustment during the test at the NSLS X-ray ring using the BPMs and active correction system allowed to achieve about 1 variations during the time less than M.5 G-cm and +lo0 G-cm2 of the first and second horizontal field integrals respectively. The results of Hall probe measurements of the vertical and horizontal field distributions are shown in Fig. 1e 3 pm of beam distortion. It corresponds to the pe&-to-pe& 9
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