Wei-hou,
Yes, that sounds right. We usually get the data from an eigenmode solver that gives the quantities needed directly.
--Michael
Search found 1942 matches
- 26 Oct 2023, 10:36
- Forum: Linac Tracking
- Topic: How does Elegant use input file for FTRFMODE?
- Replies: 2
- Views: 3400
- 25 Oct 2023, 16:19
- Forum: Bugs
- Topic: CWIGGLER generates vertical dispersion in helical mode
- Replies: 6
- Views: 4691
Re: CWIGGLER generates vertical dispersion in helical mode
Mikhail, Thanks for the detailed examples. The issues with the HELICAL=0 case can be solved by some fine-tuning. In particular, for CWIGGLER devices the transport matrix is determined through particle tracking. That has limited accuracy. You can improve the results for case 2 by adding this command ...
- 25 Oct 2023, 12:49
- Forum: General
- Topic: Coupling in ibsEmittance
- Replies: 4
- Views: 4264
Re: Coupling in ibsEmittance
Mikhail,
The formula you quote is incorrect when the horizontal damping partition number Jx is not 1. The correct formula is ex=ex0/(1+K*Jy/Jx), ey=K*ex.
For example, for APS-U we have ex0=44.3 pm and Jx=2.21. With K=1, we get ex=ey=30.5 pm
--Michael
The formula you quote is incorrect when the horizontal damping partition number Jx is not 1. The correct formula is ex=ex0/(1+K*Jy/Jx), ey=K*ex.
For example, for APS-U we have ex0=44.3 pm and Jx=2.21. With K=1, we get ex=ey=30.5 pm
--Michael
- 25 Oct 2023, 12:23
- Forum: Ring Tracking
- Topic: Access to tracking_based_matrices
- Replies: 2
- Views: 3483
Re: Access to tracking_based_matrices
Ryutaro,
You can get the matrices from the matrix_output command. It provides the option for a text file or an SDDS file.
--Michael
You can get the matrices from the matrix_output command. It provides the option for a text file or an SDDS file.
--Michael
- 25 Oct 2023, 12:23
- Forum: Ring Tracking
- Topic: Ring tracking with ciwggler element
- Replies: 6
- Views: 4483
Re: Ring tracking with ciwggler element
Weijie, It is puzzling that they don't agree, then. The CWIGGLER element uses the code developed by Ying Wu for AT many years ago. If you are just using sinusoidal mode, you could check the vertical tune using tracking and compare that to the twiss parameter calculation. They should agree closely. -...
- 25 Oct 2023, 12:18
- Forum: General
- Topic: Use of the function computeCBGGE
- Replies: 2
- Views: 3967
Re: Use of the function computeCBGGE
Ryutaro, The problem is that the phi values are not sufficiently precise. Maybe they originated in a single-precision calculation or limited-precision printout. You can fix this using sddssnap2grid DIC_C17_cydrincalcood.sdds DIC_C17_cydrincalcood.snap -col=phi,max=3600 This command will look at the ...
- 25 Oct 2023, 12:06
- Forum: Ring Tracking
- Topic: Gas Scattering lifetime
- Replies: 8
- Views: 7349
Re: Gas Scattering lifetime
Pradeep,
There's an up-to-date example in the examples file, which you can obtain from our software download page, or at https://ops.aps.anl.gov/cgi-bin/oagLog4 ... les.tar.gz
Look for PAR/elasticScatteringTracking and PAR/inelasticScatteringTracking.
--Michael
There's an up-to-date example in the examples file, which you can obtain from our software download page, or at https://ops.aps.anl.gov/cgi-bin/oagLog4 ... les.tar.gz
Look for PAR/elasticScatteringTracking and PAR/inelasticScatteringTracking.
--Michael
- 18 Oct 2023, 18:32
- Forum: General
- Topic: orbit ocrrection
- Replies: 2
- Views: 3761
Re: orbit ocrrection
I found a few problems in your files: * You had the WEIGHT parameter step to 0 on all the monitors. This causes them to be ignored. I set the value to 1. * You defined HC and VC as KICKER elements, then placed them one after the other in the lattice. Since these correct in both planes, it means you ...
- 18 Oct 2023, 14:59
- Forum: Bugs
- Topic: CWIGGLER generates vertical dispersion in helical mode
- Replies: 6
- Views: 4691
Re: CWIGGLER generates vertical dispersion in helical mode
I'm not able to replicate these issues. Can you post some files that demonstrate the problems?
Thanks--Michael
Thanks--Michael
- 18 Oct 2023, 10:00
- Forum: Ring Tracking
- Topic: One-turn matrix in the presence of the RF field?
- Replies: 1
- Views: 3255
Re: One-turn matrix in the presence of the RF field?
The recommended way to set up the single-turn matrix is using the ILMATRIX element, since it allows including details (such as chromaticity) in a fashion that is appropriate to long-term tracking. You can find a guide to doing this in the examples files, under ILMatrixFromTracking. Once you've done ...