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16:15 you can align the local WCS to cut with uv plane to find that angle.

NOTE: This method works because the waveguide port boundary is a perfect absorber ensuring zero reflections. I have not checked, but in principle using PMC or PEC boundary conditions at the beampipe ends will not give similar results due to reflections.

Thank you for nice video!

Very good video! Can we obtain the whole data of E and H field distribution after the deformation to calcuate the Q and R/Q please？

Hey hello sir, could you give me some tips on CST Microwave studio quality factor calculation for SRF cavities I am trying to calculate RF loss coming from the walls defining the material and simulation part is confusing

Hello!, i really liked your videos, thanks for sharing. I would like to ask a question. i did the exact steps you made but for approx. 4*10^6 mesh cells. My particle beam does look like a line and no wakefield occurs when it travels though the cavity. Could you help me with that? Have a nice day :)

its the exact tutorial i was looking for. Great work

I am just a beginner to start multipacting simulation. My goal is to simulate it for a coupler with RF window. So, I want to start with a coaxial geometry. Can you suggest how can I start?

Hi bro. Thanks for all the tutorials. They are helping a lot. I am physics graduate and want to learn particle in cell simulation. Could you please make tutorial how to do particle in cell simulation using cst studio? Charge particle dynamics.

great guy, i appreciate 👍

So weldon sir

Can you share the Power Point

Well done

Can you share your e-mail

You are master of CST

Pic simulation of entire klystron

You are superb

Give yr email

PIC simulation in cavity for electron beam

Electron beam bunching in klystron

PIC MODEL

Please

Full klystron smulation

PIC simulation

Correction: picofarads not picocoulombs. Thanks to @joaopaulocoelho5401 for pointing that out. If you notice some other errors, please call my attention to it. Thanks.

Secondary emission properties of Niobium used for this simulation: SEE - Niobium (300 deg C Bakeout) Material Set = Default Type = Lossy metal SE emission = Furman NOTE: In order to access the "Particles" tab, your "Problem type" has to be either "PIC" or "Tracking". On the "Particles" tab for material definition, select Furman as the SE emission model, click on ''True", and input the following for Energy and SEY Energy: 300 SEY: 1.49 SEE Niobium (Wet Treatment) Energy: 300 SEY: 1.2 [1] Kneisel, P. (2003, September). Surface characterization of bulk Nb: what has been done, what has been learnt?. In Proc. of the 11th Workshop on RF Superconductivity, Lübeck/Travemünde, Germany. [2] Scheuerlein, C., Hilleret, N., & Taborelli, M. (2002). The secondary electron yield of air exposed metal surfaces at the example of niobium. Appl. Phys., A, 76(CERN-EST-2002-003-SM), 1085-1091. You can also look here for a description of the Furman model. [3] Furman, M. A., & Pivi, M. T. F. (2002). Probabilistic model for the simulation of secondary electron emission. Physical review special topics-accelerators and beams, 5(12), 124404.

Superb video, thank you! I'm trying to do the same simulation but I don't have the SEE material, how can I get it into the CST materials library?

Thanks for the video, it helped a lot. Quick and detailed explanations.

Very, very nice video. Just a note that the capacitance is measured in fardads. Maybe you can start a series of TH-cam videos where the goal is just to simulate classic electromagnetism situations using CST since, on youtube, you can only find more advanced stuff. Electrostatic and magnetostatic situations usually solved analytically in a classroom such as a the E field promoted by a charged sphere, the magnetic field and electric field on different regions on a DC current conducting wire, and so on...

Thank you, you helped me a lot.

Thank you for this video recording. Its helpful in learning the CST tool. U gave very good detailed explanations.

thank you so much, but I have some question about loss factor, and unfortunately I can't connect to TH-cam easy, so if you have time please let me ask my questions by sending email.

I extended this to a 9 cell cavity and it does not give me the same field in all the cells. The ones at the extremes have less field. Any idea of this?

Can you show how to design circulator in 4.2-4.4 GHz

Nice tutorial ! What about the simulation part ?

what a video. You helped me prepare for my lab .

how we can extract capacitance in cst ? for this capacitor

Full video link: th-cam.com/video/M-27GDukj8k/w-d-xo.html VBA Code: ' Field Flatness Sub Main () Dim paths As Variant, types As Variant, fileNames As Variant, info As Variant, nResults As Long ' Get 0D and 1D results from Tables in navigation tree recursively mResults = Resulttree.GetTreeResults("Tables","folder 0D/1D recursive","", paths, types, fileNames, info) Dim m As Long For m = 0 To mResults-1 ' Check if "e_Abs (Z)" result exists If InStr(CStr(fileNames(m)), "e_Abs (Z)") > 0 Then ' ReportInformationToWindow("path: " + CStr(paths(n)) + vbCrLf + "type: " + CStr(types(m)) + vbCrLf + "file: " + CStr(fileNames(m))) ' Get result ID from result tree rids = Resulttree.GetResultIDsFromTreeItem(paths(m)) table_1d_path = paths(m) ' Create result object to hold array of field flatness for all parametric runs Dim result As Object Set result = Result1D("") For Each rid In rids o = Resulttree.GetResultFromTreeItem(table_1d_path, rid) y = o.GetArray("y") ' Initialize the array of peaks peakList = Array() ' Loop through the array to get the peaks For i = 1 To (UBound(y) - 1) 'ReportInformationToWindow(CStr(i) + ": " + CStr(UBound(y))) ' Check if the current element is a peak If y(i) > y(i - 1) And y(i) > y(i + 1) Then ' Re-dimension the array to include the new value ReDim Preserve peakList(0 To UBound(peakList) + 1) ' Add the current element to the peak list peakList(UBound(peakList)) = y(i) End If Next i mx = peakList(0) mn = peakList(0) avg = 0 ' Loop through the array of peaks to get the max and min peak values and the average of all peak values n = UBound(peakList) For Each v In peakList avg = avg + v/n If v > mx Then mx = v End If If v < mn Then mn = v End If Next ' Calculate field flatness ff = (1 - (mx- mn)/avg)*100 ReportInformationToWindow(rid + ":Field Flatness: " + CStr(ff) + "%") rid_v = ExtractIDFromText(rid) result.Appendxy(rid_v, ff) Next ' Save field flatness to Tables\1D Results With result .ylabel("Field Flatness / %") .Title("Field Flatness") .Save("field_flatness.sig") .AddToTree("Field Flatness" + "_" + ExtractTextFromPath(table_1d_path)) End With End If Next End Sub Sub PrintArray(arr) For Each v In arr ReportInformationToWindow(v) Next End Sub Function ExtractIDFromText(txt) As Integer Dim inputText As String inputText = txt Dim startPos As Integer Dim endPos As Integer Dim extractedNumber As String ' Find the position of the last colon (:) in the input text startPos = InStrRev(inputText, ":") + 1 ' Find the position of the next non-numeric character after the last colon For endPos = startPos To Len(inputText) If Not IsNumeric(Mid(inputText, endPos, 1)) Then Exit For End If Next endPos ' Extract the number after the last colon extractedNumber = Mid(inputText, startPos, endPos - startPos) ' Convert the extracted number to an actual number (optional, depends on your use case) Dim result As Integer result = CInt(extractedNumber) ExtractIDFromText = result End Function Function ExtractTextFromPath(pth) As String Dim inputPath As String inputPath = pth Dim lastIndex As Integer lastIndex = InStrRev(inputPath, "\") If lastIndex > 0 Then ExtractTextFromPath = Mid(inputPath, lastIndex + 1) Else ' If no '\' is found, return the original input text ExtractTextFromPath = inputPath End If End Function

' Field Flatness Sub Main () Dim paths As Variant, types As Variant, fileNames As Variant, info As Variant, nResults As Long ' Get 0D and 1D results from Tables in navigation tree recursively mResults = Resulttree.GetTreeResults("Tables","folder 0D/1D recursive","", paths, types, fileNames, info) Dim m As Long For m = 0 To mResults-1 ' Check if "e_Abs (Z)" result exists If InStr(CStr(fileNames(m)), "e_Abs (Z)") > 0 Then ' ReportInformationToWindow("path: " + CStr(paths(n)) + vbCrLf + "type: " + CStr(types(m)) + vbCrLf + "file: " + CStr(fileNames(m))) ' Get result ID from result tree rids = Resulttree.GetResultIDsFromTreeItem(paths(m)) table_1d_path = paths(m) ' Create result object to hold array of field flatness for all parametric runs Dim result As Object Set result = Result1D("") For Each rid In rids o = Resulttree.GetResultFromTreeItem(table_1d_path, rid) y = o.GetArray("y") ' Initialize the array of peaks peakList = Array() ' Loop through the array to get the peaks For i = 1 To (UBound(y) - 1) 'ReportInformationToWindow(CStr(i) + ": " + CStr(UBound(y))) ' Check if the current element is a peak If y(i) > y(i - 1) And y(i) > y(i + 1) Then ' Re-dimension the array to include the new value ReDim Preserve peakList(0 To UBound(peakList) + 1) ' Add the current element to the peak list peakList(UBound(peakList)) = y(i) End If Next i mx = peakList(0) mn = peakList(0) avg = 0 ' Loop through the array of peaks to get the max and min peak values and the average of all peak values n = UBound(peakList) For Each v In peakList avg = avg + v/n If v > mx Then mx = v End If If v < mn Then mn = v End If Next ' Calculate field flatness ff = (1 - (mx- mn)/avg)*100 ReportInformationToWindow(rid + ":Field Flatness: " + CStr(ff) + "%") rid_v = ExtractIDFromText(rid) result.Appendxy(rid_v, ff) Next ' Save field flatness to Tables\1D Results With result .ylabel("Field Flatness / %") .Title("Field Flatness") .Save("field_flatness.sig") .AddToTree("Field Flatness" + "_" + ExtractTextFromPath(table_1d_path)) End With End If Next End Sub Sub PrintArray(arr) For Each v In arr ReportInformationToWindow(v) Next End Sub Function ExtractIDFromText(txt) As Integer Dim inputText As String inputText = txt Dim startPos As Integer Dim endPos As Integer Dim extractedNumber As String ' Find the position of the last colon (:) in the input text startPos = InStrRev(inputText, ":") + 1 ' Find the position of the next non-numeric character after the last colon For endPos = startPos To Len(inputText) If Not IsNumeric(Mid(inputText, endPos, 1)) Then Exit For End If Next endPos ' Extract the number after the last colon extractedNumber = Mid(inputText, startPos, endPos - startPos) ' Convert the extracted number to an actual number (optional, depends on your use case) Dim result As Integer result = CInt(extractedNumber) ExtractIDFromText = result End Function Function ExtractTextFromPath(pth) As String Dim inputPath As String inputPath = pth Dim lastIndex As Integer lastIndex = InStrRev(inputPath, "\") If lastIndex > 0 Then ExtractTextFromPath = Mid(inputPath, lastIndex + 1) Else ' If no '\' is found, return the original input text ExtractTextFromPath = inputPath End If End Function

I forgot to include the part where you export the displacement field to the eigenmode analysis and calculate the frequency shift and pressure sensitivity. Please see previous videos for this.

*promo sm*

Something I missed in the video was changing the background material from "PEC" back to "Normal". However, since the "PEC" material has no mechanical property in CST Studio, it does not make a difference if "Normal" or "PEC" is used for this analysis.

As the help document says the indirect test beam method is used if the beam has an ultrarelativistic velocity and the beam tubes cross section at the entry boundary equals the cross section at the exit boundary. In my model, the beam tube is just an cylinder, two cross sections are totally the same. But the warning came over and said that the indirect testbeams method can not be used, the direct method is used instead. Do not know why.

good

🌚