momentum

[motahareh89]

hello! I want plot electron velocity but our datas are from order 10^-22 is it ok?

[Status-Mirror]

Hey @motahareh89,

Sorry for the delay. It sounds like you're looking at particle momenta. EPOCH uses SI units, so these are in kgm/s. A 1e-22 kgm/s electron has a velocity of:

$p = \gamma m_e v$
$E = \sqrt{p^2 c^2 + m_e^2 c^4} = \gamma m_e c^2$
$v = p c^2 / E$

hence, for $p = 10^{-22}$ kgm/s, $v \approx 1.0\times 10^8$ m/s.

Hope this helps,
Stuart

[motahareh89]

Dear Sturt, I hope this email finds you well, Thank you for your guidance, I have used epoch recently for my research so may I ask if I have a question directory by this Email? warm regards, Motahareh

…

On Wed, Feb 14, 2024 at 1:28 PM Stuart Morris ***@***.***> wrote: Hey @motahareh89 <https://github.com/motahareh89>, Sorry for the delay. It sounds like you're looking at particle momenta. EPOCH uses SI units, so these are in kgm/s. A 1e-22 kgm/s electron has a velocity of: $p = \gamma m_e v$ $E = \sqrt{p^2 c^2 + m_e^2 c^4} = \gamma m_e c^2$ $v = p c^2 / E$ hence, for $p = 10^{-22}$ kgm/s, $v \approx 1.0\times 10^8$ m/s. Hope this helps, Stuart — Reply to this email directly, view it on GitHub <#627 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BFVUNPM45GVHXTLZTQJXI3TYTSDDLAVCNFSM6AAAAABCO52BOSVHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM4DINRTGY3TK> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[Status-Mirror]

Hey Motahareh,

For many cases, you might find our documentation webpage a useful resource.

If the documentation isn't clear on something, or you're still having problems, feel free to check in on these GitHub pages - we'll generally try to provide support if we can.

Cheers,
Stuart

[motahareh89]

Thank you for responding.

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On Wed, 14 Feb 2024, 19:43 Stuart Morris, ***@***.***> wrote: Hey Motahareh, For many cases, you might find our documentation webpage <https://epochpic.github.io/> a useful resource. If the documentation isn't clear on something, or you're still having problems, feel free to check in on these GitHub pages - we'll generally try to provide support if we can. Cheers, Stuart — Reply to this email directly, view it on GitHub <#627 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BFVUNPMPR6U45NBEJ34J6FLYTTPBFAVCNFSM6AAAAABCO52BOSVHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM4DINRYGAYDE> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[motahareh89]

Dear Dr. Morris, I hope you are doing well. I'm using EPOCH for THz radiation. I have two beams with the properties that I wrote in the code. They are beating in plasma and then THz should be generated. But my result is vague Here is my code. Please help me, I have to prepare my proposal. regards, Motahareh