Superconducting Undulator Optimization
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Front End Type:
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Non-Canted, High Heat Load (HHL)
Canted Front End (CFE)
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Choose the type of front end. The HHL (High Heat Load) front end has
the highest power-handling capacity and will give the highest brightness.
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Beam Current:
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100mA (APS now)
150mA (APS-U)
200mA (Beyond APS-U)
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The beam current for present operations is 100 mA. However, for APS-U
it will increase to 150 mA. It is best to choose 150 mA for new devices.
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Optimization mode:
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Brightness
Spectral Flux Density
Spectral Flux
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Optimization can be performed for various quantities. The results
typically don't depend strongly on this choice, but if you are interested
in a particular quantity, this allows you to see plots of that quantity.
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Straight Section Length:
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Short
Long
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Straight sections normally accommodate at most 4.8m worth of insertion,
and about half that if canting is used. In the upgrade, a number of Long
Straight Sections (LSS) will be made available.
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ID Length:
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Full
Half
2.0m
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It is rare that a single ID will fill an entire straight section.
In fact, it may not be optimal because it can reduce tuning range,
by producing too much power or power density for the front end.
By choosing a half-length device, one can get better coverage
for HHL front ends. (This feature isn't relevant for canted FEs in
normal-length straights, where the length is very restricted.)
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Minimum Photon Energy List:
(comma- or space-separated
list of values in keV)
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You can optimize your ID for any number of photon energy bands.
In this box, you enter the lower limits of each band, in keV, separated
by spaces or commas. For example, to optimize two bands 3-10 and 40-50,
enter "3,40" here.
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Maximum Photon Energy List:
(comma- or space-separated
list of values in keV)
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You can optimize your ID for any number of photon energy bands.
In this box, you enter the upper limits of each band, in keV, separated
by spaces or commas. The number of upper limits must, of course, equal
the number of lower limits. For example, to optimize two bands 3-10 and
40-50, enter "10,50" here.
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