 Sun Mar 15 17:12:40 2020, Laszlo, Jan, Detectors, new Ortec spec amps ,
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We are now using new SpecAmps for the x-ray detectors from ORTEC, they deliver much improved resolution but have other strange effects as discribed in the
next entry. |
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Fri May 21 19:20:54 2021, Laszlo, General, misalignment in the pattern, 2021
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for some reason the event number of the target ON and OFF was misaligned with the pattern.
This means that the last few runs (run53, run52...) measured not in the target on phase but one before (at 10 instead of 11). Therefore, with these
runs we measured the TargetOFF phase instead TargetON (that is why the pg peak seem to disappear...) |
Thu Mar 26 12:05:22 2020, Laszlo, Calibration, measurement of collimators, 
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| The measurements were taken by using a caliper ruler, with precision of +/-0.05mm |
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Fri Apr 5 06:05:55 2019, Jan, DAQ, making changes to the DAQ ,
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If you need to add or change a module of the VME crate you need to follow this proceedure:
1. stop DRASI
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Wed Apr 8 23:02:24 2020, Laszlo, General, lmd to measurement pairing list,
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I use the following list of lmd files combined to a single root file for each measurement.
It is very important to highlight that sometimes the trigger==1 data got corrupted,massive number of trigger==2 like events appear on the detector as trigger==1
signal, because the gas jet target didn't switch off after its normal phase (gas jet remains ON during injection. Maybe some gas jet issue, maybe some |
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Tue May 25 08:36:15 2021, Jan, General, lessons learned, 2021
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1. before using stoch. cooling in ESR, boot and update the windows PC
2. better diagnostics for low energy/intensity beam-target overlapp in ESR is needed (either a clever analysis or a new detector)
more to come |
 Thu Apr 30 22:55:45 2020, Laszlo, Calibration, inverse square law test,
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I have made also the inverse square law fits. We have data only for 90degre with the 241Am source, but both for the 1. and 2. calibrations. The 1. and 2.
calibration data sets treated separate.
2 peaks were investigated, 59.5keV and 26.3keV, at two distances 184.8mm and 217.3mm. These distances are the sum of 4 distances:
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Sat Mar 21 15:30:34 2020, Sergiy, General, go into the ESR,
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We are going into the ESR to check the electronics.
Use calibration sources (133Ba etc). |
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Fri Mar 20 16:48:00 2020, Laszlo, General, flipped Si shaper output in x and y,
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Yesterday evening we have found out that the energy signals from the silicon are negative --> wrong polarity of the shapers was chosen while using the jumpers.
Cables coming from the preamp are switched now. --> in the recorded data the X and Y coordinates of the Si strip detector is the other way around!
Hopefully, the left and right side we can judge well... |
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Mon Mar 23 09:47:05 2020, Laszlo, General, explanation of an ESR cycle,
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Sun May 16 12:55:48 2021, Jan Glorius, DAQ, event server lxg1299:6003, 2021
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new event server is set up at lxg1299 on port 6003
It runs as:
/data.local1/gstore/mrevserv64 lxg1275 |
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Sat May 1 22:34:16 2021, Jan Glorius, Calibration, efficiency xray 90deg, 2021
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the attached efficiency curve for the 90 deg. xray detector is made with the runs
e127b_run0008.lmd
e127b_run0009.lmd
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Thu May 6 13:39:02 2021, Jan Glorius, Calibration, efficiency xray 35deg, 2021
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the attached efficiency curve for the 35 deg. xray detector is made with the runs
e127b_run0015.lmd
e127b_run0016.lmd
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Wed May 6 23:02:42 2020, Laszlo, Calibration, efficiency values,
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I have calculated the efficiency values by putting the energies of the K-REC peaks into the phenomenological (empirical) function and into the linear function
(see below). The K-REC peak's position I got from a Gaussian-fit on the peak. There are 5 data sets in total:
With 1. E-calibration parameters:
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Thu Apr 30 17:40:57 2020, Laszlo, Calibration, efficiency fits,
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For all 3 detector the calibration data sets were combined to include the systematics in the fit results directly. Combining means not a weighted average,
just simple all data points were included into the fit --> doubled efficiency value for most of the energies.
The g(x) = a * (1-exp(-(x-c)/b)) * exp(-x/d) function was used to describe the behavior of the Germanium detectors for the whole range of energies (global |
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Wed Apr 29 16:06:28 2020, Laszlo, Calibration, efficiency fit - 90degree, combined dataset,
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For the efficiency vs E fit of the 90degree Xray detector I have used the following phenomenological funciton:
f(x) = a * (1-exp(-(x-c)/b)) * exp(-x/d)
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Sun Mar 22 14:58:59 2020, Laszlo, General, dropping density of Gasjet,
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after like 20min run, the density of the gasjet already dropped from 10^14 to 8.7*10^13. Now it seems to remain in that value
Below in arbitrary units one can see the trend of the gas jet density starting from 10^14 to 8.7*10^13 |
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Sat Mar 21 02:36:44 2020, Laszlo, General, detector and scraper position,
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For the 124Xe primary beam measurement:
-with the DSSSD we scraped the beam at position -40
-position of the detector is set to -25. (1.5cm away from the beam)
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Fri Feb 21 11:29:59 2020, Jan, Detectors, det. distances at target chamber,
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This is the lookup table for the distance of each x-ray detector to the target.
See attched foto for explanation.
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Tue Mar 17 08:15:49 2020, Jan, General, current grids & screen in TE ,
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| measured beam diagnosis with 124Xe48+ at 326 MeV/u |