Summer work, Accelerator development
Lunds universitet, MAX IV, Accelerator Developement / Fysikjobb / Lund
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MAX IV is a national large-scale research laboratory providing scientists from Sweden and the rest of the world with instruments for research in areas such as materials science, structural biology, chemistry and nanotechnology. Fully developed it will receive more than 2 000 scientists annually. 200 people are currently employed at the MAX IV Laboratory.
Title: Theoretical analysis of the residual perturbations on the stored beam produced by a multipole injection kicker.
Description
The MAX IV 3 GeV electron storage ring has been recently equipped with a Multipole Injection Kicker (MIK). This device allows the electron beam from the linear accelerator to be transferred, captured and accumulated in the storage ring while only minimally disturbing the already stored beam. Minimizing the perturbations on the stored beam during the injection process is in fact a critical issue in modern machines in which injection is done rather often (every few minutes) in what is called the "top-up operation mode".
By replenishing the ring with electrons rather often one keeps the stored beam current nearly constant, which leads to a nearly constant heat load on accelerator and beamline components in turn resulting in improved stability of position and angle of the synchrotron light emitted by the electron beam. In most third generation storage ring sources, the injection makes use of three to four fast pulsed magnets (called kickers), which deflect the stored beam towards the injection septum and bring the injected beam into the rings acceptance.
Ideally, this scheme should allow the perturbations to the stored beam to be localized in both time and in space. However, in practice, it is extremely difficult to perfectly match all three or four kickers to produce a perfectly closed "bump" of the stored beam orbit, which leads to undesired residual oscillations of the stored beam that last for many hundreds of turns. The multipole injection kicker scheme implemented at MAX IV uses a different approach - instead of three or four kickers, only one kicker is used with a special spatial magnetic field profile which allows the injected beam to be kicked in while (ideally) not perturbing the stored beam at all. Again, real life tolerances render the scheme not absolutely perfect, but the experimental results obtained so far at MAX IV indicate that the MIK can generate perturbations that are significantly smaller than those typically obtained with a conventional four-kicker injection scheme.
In this project, the student will analyze theoretically the impact of the MIK pulsed fields on the stored beam through analytical calculations and numerical simulations. The aim is to determine a single figure of merit for the perturbations produced by the MIK that takes into account the fact the not all circulating bunches experience the same perturbation and that the vast majority of experiments at the storage ring beamlines actually only detect the time-average effect during a large number of turns.
This summer project will consist in:
o Introduction to accelerators and to the MAX IV 3 GeV ring, through review of the relevant literature.
o Review of injection process and methods.
o Development of analytical calculations based on linear approximation to the accelerator optics. Definition of an average "figure-of-merit" for the MIK perturbation.
o Study of the impact of lattice non-linearities through simulations
o Report writing
Time period: Mid June until mid August.
Lund University welcomes applicants with diverse backgrounds and experiences. We regard gender equality and diversity as a strength and an asset. We kindly decline all sales and marketing contacts.
Varaktighet, arbetstid
100 %. Tillträde: As per agreement Visstidsanställning till 2018-08-31
Publiceringsdatum2018-03-27ErsättningMonthly salary
Så ansöker duSista dag att ansöka är 2018-04-17
Ange följande referens när du ansöker: PA2018/882
Klicka på denna länk för att göra din ansökanKontaktÅke Andersson +46462220414
FöretagLunds universitet, MAX IV, Accelerator Developement
AdressLunds universitet, MAX IV, Accelerator Developement
P.O Box 118
22100 Lund
KontorsadressP.O Box 118
Jobbnummer 4048320
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