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Notes sur les simulations concernant le Linac de ThomX  Not logged in

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Message ID: 2     Entry time: Mon Nov 6 18:22:58 2017  Author: Entered by Harsh Purwar from 134.158.76.165 on Mon Nov 6 18:01:11 2017   Status: Under Process   Type: Info   Category: Astra   Important:  Subject: Asymmetric longitudinal distribution due to mirror charge, entered from 134.158.76.165   Icon:

We observe a peak in the longitudinal distribution 2.0 cm from the photo-cathode (i.e. inside the RF gun) when we include the mirror charge and the peak disappears if we don't consider the mirror charge in the simulations. Attachments: Snapshot of the ASTRA input file (Capture.png). Particle longitudinal distribution at the cathode (lp_0cm.png). Particle long. dist. at z = 2.0 cm from the cathode (lp_mc_sp_2cm.png) considering mirror and space charges, and we see a significant peak on the left. Particle long. dist. at z = 2.0 cm from the cathode (lp_nmc_sp_2cm.png) only with space charge (NOT the mirror charge), and the peak disappears. Normalized electric field for the RF gun considered for these simulations (gun_field.png).

Attachment 1: Capture.PNG  23 kB  | Hide | Hide all

Attachment 2: lp_0cm.png  67 kB  | Hide | Hide all

Attachment 3: lp_mc_sp_2cm.png  77 kB  | Hide | Hide all

Attachment 4: lp_nmc_sp_2cm.png  79 kB  | Hide | Hide all

Attachment 5: gun_field.png  74 kB  | Hide | Hide all

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