Difference between revisions of "200 kV Polarized Gun"

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This area collects 200 kV installation at CEBAF.
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* The 200 kV gun (R30-3 with spherical electrode and 18" gun HVC) was installed in CEBAF during SAD 2023.
 +
 
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* This gun performed as designed in terms of vacuum, and high voltage: no field emission at 200 kV after conditioning with Kr to ~240 kV.
 +
* It has two problems:
 +
** The beam waist is ~ 6 cm downstream of the GaAs wafer, compared to ~ 40 cm from the Tee electrode 14" HVC R28-2 gun operated in CEBAF for years at 130 kV.
 +
** It was a not possible to obtain the laser retro-reflection.
 +
* The gun was then removed from the injector and replaced with the R28-2 gun.
 +
* The SAD 2024 links below capture the planning for fixing these problems in the R30-3 gun (which will be version R30-4) and for installing it in May 2024.
 +
 
 +
 
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==R30-4 200 kV Gun SharePoint site==
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[https://jeffersonlab.sharepoint.com/:f:/s/CIS/Ejp9S0WdeXtPgFm_bwwkuEAB0gEzYKg7Ci0UfKK8qQnPfQ?e=1tfGAH R30-4 200 kV SharePoint site]
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Contains:
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* Pierce cathode end piece geometry and beam parameter space table
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* Notes, studies, and documentation
 +
* Electrostatics and beam dynamics modeling and simulation results
 +
 
 +
==R30-4 200 kV Gun SAD 2024 Planning Meetings==
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* >[https://wiki.jlab.org/ciswiki/index.php/Jan_05_2024 Jan 05, 2024]
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* >[https://wiki.jlab.org/ciswiki/index.php/Jan_10_2024 Jan 10,2024]
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* >[https://wiki.jlab.org/ciswiki/index.php/Jan_17_2024 Jan 17, 2024]
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* >[https://wiki.jlab.org/ciswiki/index.php/Jan_24_2024 Jan 24, 2024]
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* >[https://wiki.jlab.org/ciswiki/index.php/Jan_30_2024 Jan 31, 2024]
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* >[https://wiki.jlab.org/ciswiki/index.php/Feb_7_2024 Feb 7, 2024]
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* >[https://wiki.jlab.org/ciswiki/index.php/Feb_14_2024 Feb 14, 2024]
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* >[https://wiki.jlab.org/ciswiki/index.php/Feb_21_2024 Feb 21, 2024]
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* [https://wiki.jlab.org/ciswiki/index.php/Feb_28_2024 Feb 28, 2024]
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* [https://wiki.jlab.org/ciswiki/index.php/Mar_6_2024 Mar 6, 2024]
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* [https://wiki.jlab.org/ciswiki/index.php/Mar_13_2024 Mar 13, 2024]
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* [https://wiki.jlab.org/ciswiki/index.php/Mar_20_2024 Mar 20, 2024]
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* [https://wiki.jlab.org/ciswiki/index.php/Mar_27_2024 Mar 27, 2024]
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* [https://wiki.jlab.org/ciswiki/index.php/Apr_03_2024 Apr 03, 2024]
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* [https://wiki.jlab.org/ciswiki/index.php/Apr_10_2024 Apr 10, 2024]
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* [https://wiki.jlab.org/ciswiki/index.php/Apr_17_2024 Apr 17, 2024]
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* [https://wiki.jlab.org/ciswiki/index.php/Apr_24_2024 Apr 24, 2024]
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* [https://wiki.jlab.org/ciswiki/index.php/May_1_2024 May 1, 2024]
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==R30-3 200 kV Gun SAD 2023 Installation Links==
  
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== 200 kV Gun Installation Links ==
 
 
* ATLIS => https://tasklists.jlab.org/atlis/tasks/108541
 
* ATLIS => https://tasklists.jlab.org/atlis/tasks/108541
 
* Marcy's Gantt chart goes here => https://jeffersonlab-my.sharepoint.com/:x:/g/personal/marcy_jlab_org/EUe-xbLpNR1IsV28fyi20FUBC4bUllOnMnAYlXemA7C82Q
 
* Marcy's Gantt chart goes here => https://jeffersonlab-my.sharepoint.com/:x:/g/personal/marcy_jlab_org/EUe-xbLpNR1IsV28fyi20FUBC4bUllOnMnAYlXemA7C82Q
 
* List of photocathodes at end of Phase 1 (5/10/2021) - https://logbooks.jlab.org/entry/3876517
 
* List of photocathodes at end of Phase 1 (5/10/2021) - https://logbooks.jlab.org/entry/3876517
  
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==Planning Meetings==
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==R30-3 200 kV Gun SAD 2023 Planning Meetings==
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* Feb 20, 2023 => * Carlos SAD schedule [[Media:Gun swap planning 1 week before and 1 week after SAD start.pptx]]
 
* Feb 20, 2023 => * Carlos SAD schedule [[Media:Gun swap planning 1 week before and 1 week after SAD start.pptx]]
 
* Feb 02, 2022 => [[Feb 2, 2022 - Group meeting]] - Group meeting + 200 kV gun
 
* Feb 02, 2022 => [[Feb 2, 2022 - Group meeting]] - Group meeting + 200 kV gun
 
* Jan 26, 2022 => [[200 kV Gun - Jan 26, 2022]]
 
* Jan 26, 2022 => [[200 kV Gun - Jan 26, 2022]]
  
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== Links ==
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==Links==
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* [https://wiki.jlab.org/ciswiki/index.php/18%22_Photogun_ala_GTS Carlos 18" Gun Page]
 
* [https://wiki.jlab.org/ciswiki/index.php/18%22_Photogun_ala_GTS Carlos 18" Gun Page]
 
* Gun Anode - Carlos's update https://wiki.jlab.org/ciswiki/index.php/Anode
 
* Gun Anode - Carlos's update https://wiki.jlab.org/ciswiki/index.php/Anode

Latest revision as of 13:48, 30 April 2024

  • The 200 kV gun (R30-3 with spherical electrode and 18" gun HVC) was installed in CEBAF during SAD 2023.
  • This gun performed as designed in terms of vacuum, and high voltage: no field emission at 200 kV after conditioning with Kr to ~240 kV.
  • It has two problems:
    • The beam waist is ~ 6 cm downstream of the GaAs wafer, compared to ~ 40 cm from the Tee electrode 14" HVC R28-2 gun operated in CEBAF for years at 130 kV.
    • It was a not possible to obtain the laser retro-reflection.
  • The gun was then removed from the injector and replaced with the R28-2 gun.
  • The SAD 2024 links below capture the planning for fixing these problems in the R30-3 gun (which will be version R30-4) and for installing it in May 2024.


R30-4 200 kV Gun SharePoint site

R30-4 200 kV SharePoint site


Contains:

  • Pierce cathode end piece geometry and beam parameter space table
  • Notes, studies, and documentation
  • Electrostatics and beam dynamics modeling and simulation results

R30-4 200 kV Gun SAD 2024 Planning Meetings

R30-3 200 kV Gun SAD 2023 Installation Links

R30-3 200 kV Gun SAD 2023 Planning Meetings

Links

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