Elegant users forum

Hi,

I want to model the effect of LSC in a 1 meter drift space using LSCDRIFT (toy example)
I am a bit confused about the description of cutoff frequency in the manual.

Does LOW_FREQUENCY_CUTOFF0 actually mean the highest frequency that LSCDRIFT will take into account ?
Say, if it is 0.25, then anything after 0.25*Nyquist frequency will be set to zero.

Similarly, if HIGH_FREQUENCY_CUTOFF0 is set to 0, does that mean smoothing filter will be applied to the whole frequency spectrum ?
Thanks.

Here I also attach my toy example for your reference.

TAN

Tan,

The terminology is a bit confusing.

• HIGH_FREQUENCY_CUTOFF0 and HIGH_FREQUENCY_CUTOFF1 are used to filter out high frequencies, i.e., they provide a low-pass filter. The filter has value 1 for f<HIGH_FREQUENCY_CUTOFF0, value 0 for f>HIGH_FREQUENCY_CUTOFF1, and linear variation in between.
• LOW_FREQUENCY_CUTOFF0 and LOW_FREQUENCY_CUTOFF1 are used to filter out low frequencies, i.e., they provide a high-pass filter. The filter has value 0 for f<LOW_FREQUENCY_CUTOFF0, value 1 for f>LOW_FREQUENCY_CUTOFF1, and linear variation in between.

--Michael

Hi,

Thanks for your explanation.
Is it possible to output the plot of impedance or LSC kick in ELEGANT ?

TAN

Tan,

Unfortunately, there's no feature now for plotting the LSC impedance. You can calculate it using the formula given on the manual page. The program sddsfdfilter will allow you to easily apply filters of the same time used in elegant.

--Michael