Injection/Extraction Kicker for the Als-U Project*

2019

The MAX IV 3 GeV ring is the first synchrotron light source utilizing the Multi-Bend Achromat scheme to achieve a low horizontal bare-lattice emittance of 328 pm rad providing high brilliance x-rays for users. A novel Multipole Injection Kicker (MIK) designed and constructed by SOLEIL is used to allow top-up operation with only minor disturbances to the stored beam, i.e., the users. We investigate the stored beam perturbations due to quadrupole fields arising during the MIK pulse, originating from its inner coating. Maximum bunch emittance growth of §I{21}{πco\meter\radian} was found in simulations. Measurements of the stored beam impact are performed and found to be in good agreement with simulations. We conclude that the MIK at MAX IV 3 GeV has the potential to deliver quasi-transparent injections with good capture efficiency.

2015

The ALS in now engaged in the construction of a new hard x-ray beam line and insertion device for protein crystallography. The scope of work entails the reconfiguration of ALS Sectors 1-3 to make room for the new insertion device. The project will require the melioration of the ALS injection system as well as the development of a longitudinal RF kicker. A key aspect of the injector work is the development and integration of a nonlinear injection kicker (NLK) magnet system to facilitate top off injection without noticeable motion of the beam. The technology will, in principal, ultimately allow the removal of the conventional bump injection magnets presently located in ALS Sector 1. The nonlinear injection concept has been explored at several other light sources [1]. We examine the beam dynamics and magnet design requirements to adapt this technology to the ALS lattice with its 1.9 GeV beam. The work will review the injection beam matching, tracking simulations, the electromagnetic de...

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268), 2001

Storage rings have served well as x-ray sources, achieving continued increases in flux and brilliance. While further improvements in performance may still be expected, the performance of these machines is constrained by radiation fluctuations and by the Touschek effect. The practical effect of the radiation fluctuations is to limit the minimum 6D emittance of the rings in general, and particularly the bunch length. The Touschek effect limits the lifetime and the bunch charge density. These effects can be ameliorated by using a linac to accelerate the beam to the requisite energy before passing it through undulators to produce the x-rays. If the beam is discarded after producing x-rays, radiation and collision effects are no longer limiting. This approach has not been used because prohibitive amounts of energy would be required to produce the beam. However, by using energy recovery in a superconducting linac, the energy can be recycled to accelerate new electrons. This would allow the use of currents comparable to those in storage rings, but with superior emittance, bunch length and flexibility. The concept of a 5-7 GeV facility using this principle is described and parameter goals given.

1987

7th International Particle Accelerator Conference (IPAC'16), Busan, Korea, May 8-13, 2016, 2016

Improvements in brightness and coherent flux of about two orders of magnitude over operational storage ring based light sources are possible using multi bend achromat lattice designs [1]. These improvements can be implemented as upgrades of existing facilities, like the proposed upgrade of the Advanced Light Source, making use of the existing infrastructure, thereby reducing cost and time needed to reach full scientific productivity on a large number of beamlines. An R&D program was started at LBNL to further develop the technologies necessary for diffraction-limited storage rings. It involves many areas, and focuses on the specific needs of soft x-ray facilities [2]: NEG coating of small chambers, swap-out injection, bunch lengthening, magnets/radiation production, x-ray optics, and beam physics design optimization. Hardware prototypes have been built and concepts and equipment was tested in beam tests on the existing ALS.

2006

1994

J.P. Delahaye and J.P. Potier CERN-PS CH 1211 Geneva 23 other bunches circulating in the inner side of the septum without any field (fig. l-d). A simple scheme is proposed which allows a dense filling of individual bunches in rings with separation between . . ,A, ,-y. ,-y, .,“-, , ,,d following bunches shorter than the rise and fall time of the \.‘, ‘4’ 1 ‘4, ’ ‘6’ ’ ‘A’ 6 ‘Lb’ ‘D injection or extraction kickers which is the usual limitation. It Time m bunch repairion period I bunch number therefore permits a significant reduction of the minimum Figure I-a RF dipole deflection on tie different bunches circumference of facilities such as accumulators or damping rings where each bunch has to be injected or extracted individually or conversely to accomodate more bunches in the ~ 11 ,--. same circumference. _ / ‘* ‘. I It is based on a local orbit deformation close to the septum 2 3 Q 1 2 3 . 5 1 7 8 0 10 which is modulated from bunch to bunch with FZF transverse Tune in bunch repetitia...

2017

Improvements in brightness and coherent flux of about two orders of magnitude over operational storage ring based light sources are possible using multi bend achromat lattice designs. These improvements can be implemented as upgrades of existing facilities, like the proposed upgrade of the Advanced Light Source (ALS-U). The upgrade proposal will reuse much of the existing infrastructure, thereby reducing cost and time needed to reach full scientific productivity on a large number of beamlines. We will report on the accelerator design progress as well as the details of the ongoing R+D program.

Proceedings of the 2005 Particle Accelerator Conference, 2005

The Femtoslicing beamline at the ALS employs a fs laser beam interacting resonantly with the electron beam in a wiggler. The induced energy spread over the fs duration is converted to a transverse displacement by exploiting the storage ring dispersion. The displaced fs pulse radiates and produces fs synchrotron radiation. Up to now a regular bending magnet was used as radiator. To improve the flux, a significant upgrade was implemented, replacing the modulator, installing an in-vacuum undulator as new radiator, and installing a higher repeptition rate laser system. The new beamline will provide 100-200 fs long pulses of soft and hard x-rays with a repetition rate of 10-40 kHz for experiments concerning ultrafast dynamics in solid state physics, chemistry and biology.

Spectrochimica Acta Part B: Atomic Spectroscopy, 2007

A new soft X-ray beamline with double-crystal monochromator and double direction focus has been constructed at Beijing Synchrotron Radiation Facility (BSRF). The beamline covers the soft X-ray energy range from 1.2 keV up to 6 keV. There are three pairs of crystals (Si (111), InSb (111), KTP(011)) for the monochromator, separately. The performance of the crystals in respect to flux, resolving power and higher orders is discussed, and some representative results from the beamline are given. The beamline is used for a variety of experiments, for example, calibration detector, measurements of optics element characteristics and soft X-ray spectroscopy (SXS).