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Re: FRS Calibration Issue [message #17096 is a reply to message #17095]

Thu, 24 July 2014 15:19

mlcortes
Messages: 41
Registered: July 2014
Location: Darmstadt

continuous participant

From: *ikp.physik.tu-darmstadt.de

Hi Scott,

Usually the FRS calibrations are done with primary beam runs. This is because only for that case you can be sure that you have mainly particles with the same Z entering the MUSICS (not taking into account charged states). Also, this primary beam settings have a smaller velocity spread and are more accurate the make the tof calibration. The runs are the same runs that are used to calibrate the effective matter of the FRS.
So, energy loss of charged particles depends on the charge and on the velocity. If you have the same beam (and then the same Z) with 3 different velocities you can use the energy loss in the musics (that now depends only on the velocity) to find a function (only of beta) for the energy loss (where you should see that for increasing velocity energy loss decreases) and then calculate Z as

Z= Z0sqrt(DEltaE/f(beta))

Here Z0 is the atomic number of the beam you used to calibrate. f(beta) is the cuadratic function that you fit to the plot of DeltaE vs beta. This is the way the code finds Z. I think that as you are mixing files with different values of Z the function that you fit does not depend only on beta and that is why you dont have a proper calibration.
I suggest to use the calibration files and check again. Let me know if you have any problem.

Li^2

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[Message index]

		FRS Calibration Issue By: SMilne on Tue, 22 July 2014 19:14
		Re: FRS Calibration Issue By: mlcortes on Thu, 24 July 2014 09:48
		Re: FRS Calibration Issue By: SMilne on Thu, 24 July 2014 14:52
		Re: FRS Calibration Issue By: mlcortes on Thu, 24 July 2014 15:19
		Re: FRS Calibration Issue By: SMilne on Wed, 17 September 2014 14:22
		Re: FRS Calibration Issue By: mlcortes on Wed, 17 September 2014 14:34
		Re: FRS Calibration Issue By: SMilne on Wed, 17 September 2014 16:01
		Re: FRS Calibration Issue By: mlcortes on Fri, 19 September 2014 08:01
		Re: FRS Calibration Issue By: SMilne on Thu, 24 July 2014 18:06
		Re: FRS Calibration Issue By: SMilne on Fri, 19 September 2014 15:31
		Re: FRS Calibration Issue By: mlcortes on Sun, 21 September 2014 21:59
		Re: FRS Calibration Issue By: SMilne on Mon, 22 September 2014 19:50
		Re: FRS Calibration Issue By: mlcortes on Wed, 24 September 2014 00:10
		Re: FRS Calibration Issue By: SMilne on Wed, 24 September 2014 12:05
		Re: FRS Calibration Issue By: SMilne on Wed, 24 September 2014 12:14
		Re: FRS Calibration Issue By: mlcortes on Wed, 14 January 2015 09:35
		Re: FRS Calibration Issue By: SMilne on Fri, 16 January 2015 01:45
		Re: FRS Calibration Issue By: SMilne on Fri, 16 January 2015 01:53
		Re: FRS Calibration Issue By: mlcortes on Fri, 16 January 2015 13:49
		Re: FRS Calibration Issue By: SMilne on Fri, 16 January 2015 19:35
		Re: FRS Calibration Issue By: mlcortes on Mon, 19 January 2015 13:10
		Re: FRS Calibration Issue By: SMilne on Mon, 19 January 2015 19:08
		Re: FRS Calibration Issue By: mlcortes on Wed, 28 January 2015 10:10
		Re: FRS Calibration Issue By: SMilne on Tue, 10 February 2015 17:09
		Re: FRS Calibration Issue By: mlcortes on Thu, 12 February 2015 10:05
		Re: FRS Calibration Issue By: SMilne on Thu, 12 February 2015 13:59
		Re: FRS Calibration Issue By: mlcortes on Tue, 17 February 2015 12:06
		Re: FRS Calibration Issue By: SMilne on Tue, 17 February 2015 13:23
		Re: FRS Calibration Issue By: mlcortes on Tue, 17 February 2015 15:31
		Re: FRS Calibration Issue By: SMilne on Tue, 17 February 2015 17:20
		Re: FRS Calibration Issue By: mlcortes on Tue, 17 February 2015 17:29
		Re: FRS Calibration Issue By: SMilne on Thu, 26 February 2015 01:12
		Re: FRS Calibration Issue By: mlcortes on Mon, 02 March 2015 17:54
		Re: FRS Calibration Issue By: SMilne on Wed, 20 May 2015 12:19
		Re: FRS Calibration Issue By: SMilne on Fri, 22 May 2015 10:36
		Re: FRS Calibration Issue By: mlcortes on Fri, 22 May 2015 13:27

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