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| Re: Positioning of the mechanics [message #17307 is a reply to message #17299] |
Wed, 17 September 2014 17:03   |
Damian Ralet
Messages: 35
Registered: July 2014
Location: Darmstadt
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continuous participant |
From: *gsi.de
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Hi Tayfun,
The mechanic can be indeed not perfectly aligned. But the shift should be small (few mm).
The same can be expected from the target position, where the center can be slightly shift (2 mm for me).
The way I got the shift, is using the doppler corrected X-rays spectra. It is of course not optimum since energy is low, but it gives a starting point for future gamma.
Cheers,
Damian
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| Re: Positioning of the mechanics [message #17320 is a reply to message #17299] |
Fri, 19 September 2014 16:14 |
Damian Ralet
Messages: 35
Registered: July 2014
Location: Darmstadt
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continuous participant |
From: *gsi.de
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Hi Tayfun,
I hope not for the huge shift ^^
I am using the PSA interaction positions. I know it is not optimum at the moment, but it was fine for a rough tuning.
I still have to improve PSA, and get this procedure done again, most probably with a gamma line (which is easier for tunning if statistic is sufficient).
The other solution, is to use the segment center to doppler correct the spectra. I did not try it for X-rays, and I am not sure it is a any helps to have a big error on position to do a fine tunning of the position of the target.
Damian
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