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==
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*Email chain subject name: GPT & IBSIMU Temporary Shared Folder
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*Email chain subject name: Emittance Growth through Anode Aperture - Why there is a bump in the plot of RMS Emittance vs z
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**Date: Dec 12, 2019
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**Date: Dec 16, 2019
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**Description: OneDrive folder created for sharing large attachments - workaround for uploading files larger than 300MB to wiki
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**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)
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*Email chain subject name: Re: Re: Re: Re: ……….. (my notes)
 
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**Date: Dec 10, 2019
 
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**Description: Shared Python code for creating standard output plots (x,y,x',y',etc.)
 
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*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==
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*Need to make ppt slide showing CST model with Rmax regions (regions where particles are removed), and where E-field is defined
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*Josh:
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*Create a "killmap" (Map3D_Remove GPT function) from stepfile?
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**Ask bas about space charge routine to simulate ions within beam potential
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*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
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**Look at GPT time-based field maps for beam potential (i.e. to simulate time-dependent beam potential)
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*Perhaps use physical values of steering coils (in G-cm)
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**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.
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*Make plot of Cristhian's B & Φ on axis (including solenoids, correctors, and E-field)
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**Try GPT simulations with and without space charge.
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*Start at 135mm with correct particle distribution (i.e. use screen at z=135mm) for easy comparisons with IBSimu
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**Put stdx and stdy vs Z on side view simulations.
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*Correct x vs y plot (Python) - update axis labels
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**Produce initial particle distribution that starts at 135mm using a Gaussian distribution
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*Pick solenoid lens setting for small beam at dipole
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**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)
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*Fix 15 deg dipole field map link (wasn't working at time of meeting) and upload to wiki w/comment
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*Next meeting is Jan 10, 2020
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*Figure out cause of bump in RMS emittance plot
+
 
  
  

Revision as of 12:07, 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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