Revolver Undulator Optimizer
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Front End Type:
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Canted Front End (CFE)
Non-Canted, High Heat Load (HHL)
Non-Canted, Very High Heat Load (VHHL)
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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. Hence, it is best to choose
a design that is optimized for 150 mA.
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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. Note that choosing a LSS
requires selecting a canted front end, since a very long revolver doesn't
seem reasonable.
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ID Length:
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Full
Half
2.4m
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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. (For canted sector, "Full" and "Half" give the
same result, since it doesn't make sense to have a half-length device.)
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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 revolver 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 30-40 and 10-50,
enter "30,10" 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 revolver 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 30-40 and
10-50, enter "40,50" here.
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IDs In Band List:
(comma- or space-separated
list of values. 1=1 ID, 2=2 ID)
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For each band, you can imagine optimizing either a single ID period
or both ID periods. In this box, you can enter a "1" or "2" for each
pair of lower/upper limits to indicate how many ID periods to consider
for that band. Specifying 1 is only allowed for two of the bands. Others
must be "2". For example, to optimize two bands 30-40 and 10-50, try entering
"1,2" here.
Note that even if you optimize for a single period in a band, the plots
will show the effect of both periods.
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Gap (mm):
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11.0 (easy)
10.75 (possible)
10.5 (difficult)
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Present APS undulators typically run with a minimum gap of 11 mm, although in
some cases gaps as low as 10.5 mm have been provided through careful construction
and alignment.
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Periods to consider:
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Existing periods only
Full selection
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For revolvers, we restrict periods to 17 to 33 mm in 1 mm steps.
Present APS undulators have periods of 18, 23, 27, 30, 33, 35, and 55 mm.
APS-U is presently considering only these periods. However, this software
can analyze the benefits of the full selection from 17 to 33 mm.
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