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Keywords: stepping RF
Forum: Event and Track Management
Re: None Redoing a step? (Tom Roberts)
Re: None Re: Redoing a step? (Makoto Asai)
Date: 16 Jan, 2003
From: Tom Roberts <Tom Roberts>

I guess I wasn't quite clear enough.

I do not want to change the time of the track, I need to change the timing offset of the RF cavity, which affects the fields inside the cavity. I don't know how to make the change until the particle is at the center of the cavity. But the change affects how long it takes the particle to get from the upstream edge to the center, which implies an error in the change I just made.... I am confident this will converge rapidly. The point is to algorithmically tune the timing offset of the RF cavity so the particle reaches the center of the cavity at precisely the desired phase of the RF, accurately taking into account the acceleration of the particle by the RF.

I don't see how to make a process which takes the track backwards in both time and space. BTW this step is always in vacuum, and all stochastic processes are turned off.

If I could just copy all the data from the previous step into the current step, this would be simple. But I don't know what the ramifications of doing that might be (:-)). I'm quite willing to take multiple steps over the same space and time, rather than re-doing a single step. I don't care if the trajectory gets screwed up, I just care that the tracking of the particle is correct (after this repeated step it must reflect the final version of the offset). This particle is used ONLY to set these RF cavity timing offsets.

Or might it be possible to do something like this: save the track at the end of the previous step, perform this step, adjust the timing offset, kill this track, and then process the saved track (repeat until done)?

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1 Ok: Re: Redoing a step?   (Tom Roberts - 11 Feb, 2003)
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