cut off frequency option in LSCDRIFT

Moderators: cyao, michael_borland

Post Reply
WEI-HOU
Posts: 31
Joined: 01 Mar 2018, 08:20

cut off frequency option in LSCDRIFT

Post by WEI-HOU » 31 Aug 2018, 18:27

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
Attachments
elegant.lte
(2.26 KiB) Downloaded 203 times
elegant.ele
(767 Bytes) Downloaded 198 times

michael_borland
Posts: 1927
Joined: 19 May 2008, 09:33
Location: Argonne National Laboratory
Contact:

Re: cut off frequency option in LSCDRIFT

Post by michael_borland » 04 Sep 2018, 11:22

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

WEI-HOU
Posts: 31
Joined: 01 Mar 2018, 08:20

Re: cut off frequency option in LSCDRIFT

Post by WEI-HOU » 06 Sep 2018, 22:28

Hi,

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

TAN

michael_borland
Posts: 1927
Joined: 19 May 2008, 09:33
Location: Argonne National Laboratory
Contact:

Re: cut off frequency option in LSCDRIFT

Post by michael_borland » 07 Sep 2018, 15:25

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

Post Reply