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MUST2
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 Sat Feb 29 10:34:31 2020, mugast ; valerian irene, e775s, OFFLINE, Software, Ongoing, CD2-Au, Issues in the EX reconstruction 
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 Sat Feb 29 14:27:48 2020, mugast ; Valerian, e775s, OFFLINE, Software, Ongoing, CD2, Issues in the EX reconstruction 6x
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Sat Feb 29 15:53:12 2020, mugast ; Valerian, e775s, OFFLINE, Software, Ongoing, CD2-Au, Issues in the EX reconstruction
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Sat Feb 29 17:18:02 2020, mugast ; Valerian, Marlène , Pierre, e775s, OFFLINE, Software, Ongoing, CD2-Au, Issues in the EX reconstruction
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Message ID: 5839
Entry time: Sat Feb 29 14:27:48 2020
In reply to: 5838
Reply to this: 5841
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| Author: |
mugast ; Valerian |
| ExpNbr: |
e775s |
| Type: |
OFFLINE |
| Category: |
Software |
| Status: |
Ongoing |
| Target-Source: |
CD2 |
| Subject: |
Issues in the EX reconstruction |
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| mugast ; valerian irene wrote: | We are currently working on the EX reconstruction which is off for detector 1, 3 and 7... One of our guess might be that there is an issue with the position of the detectors which gives error in theta... As the energy calibration is ok. Joined are :
- the Excitation energy for good detectors compared to all detectors,
- the theoretical kinematic line for the 3.57 state for each detectors,
- the excitation energy as a function of the laboratory angle (for this last spectra a clear dependency is visible for telescopes 1,3 and 7)
- the 3D view, which doesn't show clear problem in position... |
Testing changing the beam impact :
-Kine for beam impact = (0,0,0) for reference
-Kine for beam impact = (0,0,-5mm)
-Kine for beam impact = (0,0,+5mm)
-Ex vs ThetaLab for beam impact = (0,0,0) for reference
-Ex vs ThetaLab for beam impact = (0,0,-5mm)
-Ex vs ThetaLab for beam impact = (0,0,+5mm)
Red lines corresponds to Ex = 3.570 MeV and Ex = 4.070 MeV
To try to correct the problem i also offseted the beam in X and Y, but this doesn't solve the problem quite the opposite as it make the result worse for other detectors also... The fact that it is better at lower angle and worse at higher angle might mean that the detectors angles are tilted compared to the
surveyors measurments... I also tried to use the CAO positions for MG3 (see Detectors/mugast.detector) but it didn't solve the problem. |
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