Difference between revisions of "Dec 20, 2019 Meeting Minutes"

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(Created page with "==Emails/attachments sent during the previous week== *Email chain subject name: GPT & IBSIMU Temporary Shared Folder **Date: Dec 12, 2019 **Description: OneDrive folder create...")
 
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==Emails/attachments sent during the previous week==
 
==Emails/attachments sent during the previous week==
*Email chain subject name: GPT & IBSIMU Temporary Shared Folder
+
*Email chain subject name: Emittance Growth through Anode Aperture - Why there is a bump in the plot of RMS Emittance vs z
**Date: Dec 12, 2019
+
**Date: Dec 16, 2019
**Description: OneDrive folder created for sharing large attachments - workaround for uploading files larger than 300MB to wiki
+
**Description: Explanation of bump in RMS emittance vz Z plot for beam through anode aperture - reason is anode is acting like an einzel lens (radial E-field)
*Email chain subject name: Re: Re: Re: Re: ……….. (my notes)
+
**Date: Dec 10, 2019
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**Description: Shared Python code for creating standard output plots (x,y,x',y',etc.)
+
*Email chain subject name: Electrostatic model assembly file and tutorial by Gabriel
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**Date: Dec 13, 2019
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**Description: Carlos shared Gabriel's T-Cathode model on the wiki and sent a pdf with a summary of the model
+
  
 
==Post-meeting notes==
 
==Post-meeting notes==
*Need to make ppt slide showing CST model with Rmax regions (regions where particles are removed), and where E-field is defined
+
*Josh:
*Create a "killmap" (Map3D_Remove GPT function) from stepfile?
+
**Ask bas about space charge routine to simulate ions within beam potential
*Solenoid and second steerer field maps are overlapping...perhaps move second corrector upstream to z=0.5m? - need same kicks on both correctors so that the beam returns to center
+
**Look at GPT time-based field maps for beam potential (i.e. to simulate time-dependent beam potential)
*Perhaps use physical values of steering coils (in G-cm)
+
**Check beam parameters: for a 1mA, 500MHz beam, the bunch charge should be 2pC. Bunch length should be 50ps (RMS). Beam size (laser spot) at PC should be 1mm RMS.
*Make plot of Cristhian's B & Φ on axis (including solenoids, correctors, and E-field)
+
**Try GPT simulations with and without space charge.
*Start at 135mm with correct particle distribution (i.e. use screen at z=135mm) for easy comparisons with IBSimu
+
**Put stdx and stdy vs Z on side view simulations.
*Correct x vs y plot (Python) - update axis labels
+
**Produce initial particle distribution that starts at 135mm using a Gaussian distribution
*Pick solenoid lens setting for small beam at dipole
+
**Put Alex Chao paper with calculations on wiki (This paper is for Fast Ion Instability -- a potential method to determine the identities of ions within an electron beam with very long bunches)
*Fix 15 deg dipole field map link (wasn't working at time of meeting) and upload to wiki w/comment
+
*Next meeting is Jan 10, 2020
*Figure out cause of bump in RMS emittance plot
+
 
  
  

Revision as of 13:07, 23 March 2020

Emails/attachments sent during the previous week

  • Email chain subject name: Emittance Growth through Anode Aperture - Why there is a bump in the plot of RMS Emittance vs z
    • Date: Dec 16, 2019
    • Description: Explanation of bump in RMS emittance vz Z plot for beam through anode aperture - reason is anode is acting like an einzel lens (radial E-field)

Post-meeting notes

  • Josh:
    • Ask bas about space charge routine to simulate ions within beam potential
    • Look at GPT time-based field maps for beam potential (i.e. to simulate time-dependent beam potential)
    • Check beam parameters: for a 1mA, 500MHz beam, the bunch charge should be 2pC. Bunch length should be 50ps (RMS). Beam size (laser spot) at PC should be 1mm RMS.
    • Try GPT simulations with and without space charge.
    • Put stdx and stdy vs Z on side view simulations.
    • Produce initial particle distribution that starts at 135mm using a Gaussian distribution
    • Put Alex Chao paper with calculations on wiki (This paper is for Fast Ion Instability -- a potential method to determine the identities of ions within an electron beam with very long bunches)
  • Next meeting is Jan 10, 2020


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