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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/24566736
Record Status
Checked
Record Id
24566736
Title
Beam studies at the SPEAR3 synchrotron using a digital optical mask
Contributors
H Zhang (Maryland Univ., Cockcroft Inst., and Liverpool Univ.)
,
R Fiorito (Maryland Univ., Cockcroft Inst., and Liverpool Univ.)
,
J Corbett
,
A Shkvarunets
,
K Tian
,
A Fisher
Abstract
The 3GeV SPEAR3 synchrotron light source operates in top-up injection mode with up to 500 mA circulating in the storage ring (equivalently 392 nC). Each injection pulse contains 40–80 pC producing a contrast ratio between total stored charge and injected charge of about 6500:1. In order to study transient injected beam dynamics during user operations, it is desirable to optically image the injected pulse in the presence of the bright stored beam. In the present work this is done by imaging the visible component of the synchrotron radiation onto a digital micro-mirror-array device (DMD), which is then used as an optical mask to block out light from the bright central core of the stored beam. The physical masking, together with an asynchronously-gated, ICCD imaging camera, makes it possible to observe the weak injected beam component on a turn-by-turn basis. The DMD optical masking system works similar to a classical solar coronagraph but has some distinct practical advantages: i.e. rapid adaption to changes in the shape of the stored beam, a high extinction ratio for unwanted light and minimum scattering from the primary beam into the secondary optics. In this paper we describe the DMD masking method, features of the high dynamic range point spread function for the SPEAR3 optical beam line and measurements of the injected beam in the presence of the stored beam.
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Language
English (EN)
Type
Details
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Year
Journal Article
Nucl Instrum Meth A
817 (2016): 46-56.
doi:10.1016/j.nima.2016.01.071
2016
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