 Thu Apr 23 19:09:58 2020, Laszlo, Calibration, theoretical K-REC cross sections , 9x
|
Find attached Andrey Surzhykov's calculations for the theta angle in respect to the beam direction (in lab. frame) vs. cross section for 124Xe54+ and 118Te52+.
The calculations made for collision with two H atoms with the accuracy of 1%. There are no molecular corrections done, but these corrections are within
1%.
|
|
Wed Apr 29 16:06:28 2020, Laszlo, Calibration, efficiency fit - 90degree, combined dataset,
|
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)
|
 Thu Apr 30 17:40:57 2020, Laszlo, Calibration, efficiency fits,
|
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 |
|
Thu Apr 30 22:55:45 2020, Laszlo, Calibration, inverse square law test,
|
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:
|
|
Wed May 6 23:02:42 2020, Laszlo, Calibration, efficiency values,
|
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:
|
|
Tue May 19 16:48:15 2020, Laszlo, General, E127 beamtime overview,
|
Here is a representation how was the time management during E127. The time, what we could spend with measuring the 118Te(pg), was ~20% comparing to the
given 6days. |
|
Fri Jun 5 14:06:15 2020, Laszlo, Detectors, DSSSD and SCRAPER position estimate for Xe and Te experiments, 2020
|
We don't know the exact absolute positions of the detector (+scraper) and the beam. However, what we have to know is only these two relative positions respect
to each other. To get this distance I use two methods:
1, combining the infos from the set position during the beamtime + the measured pg peak position on the detector. The pg peak position is defined only |
|
Sun May 16 13:31:49 2021, Laszlo, DAQ, Cabling Documentation, 2021
|
| Si HV and current was switched in the last documentation. |
|
Thu May 20 18:11:24 2021, Laszlo, General, Touching the beam with Dsssd - current change, 2021
|
| |
|
Thu May 20 18:13:55 2021, Laszlo, General, Vacuum change while Si movement, 2021
|
The vacuum remained in the E-10 range after moving the dsssd. The oscillation in the vacuum.values are due to the
magnets ramping up and down |
|
Fri May 21 01:17:37 2021, Laszlo, Analysis, simple analysis code, 2021
|
//a simple code (template) for offline analysis
//made by Laszlo, serves as a simple demonstration for enthusiastic shifters
//it creates a "no double counting Si 2D pos" histo
|
|
Fri May 21 19:20:54 2021, Laszlo, General, misalignment in the pattern, 2021
|
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...) |
|
Sat May 22 16:28:10 2021, Laszlo, General, DSSSD movement, 2021
|
| The DSSSD is moved back to its measurement position(-25mm). |
|
Sat May 22 17:13:48 2021, Laszlo, Detectors, Si position changed, 2021
|
| Si was moved from -25 mm to -19 mm before run 0072. |
|
Sat May 22 17:15:26 2021, Laszlo, General, Scraper position, 2021
|
We found the beam axis with the scraper to be -17.5 mm.
The Scraper position set to +12.5 mm, 30 mm relative from the beam. |
|
Sat May 22 21:33:22 2021, Laszlo, Detectors, Xray detectors are filled at 90 and 35, 2021
|
| |
|
Sun May 23 02:16:47 2021, Laszlo, General, quick comparison between different scraping positions, 2021
|
So far we did 3 scraping positions:
- 30mm away from beam axis (lmd72-75)
- 25mm away from beam axis (lmd78-80)
|
|
Wed May 26 07:08:07 2021, Laszlo, Calibration, quick and dirty calibration coefficients for the Si channels, 2021
|
The coefficients are produced only quick and dirty, S_x=1 was fixed to 1.
E = E_x = E_y = S_x*A_x = S_y*A_y
|
|
Fri May 28 14:14:31 2021, Laszlo, General, Alvarez failure at 10:30 28:05:2021, 2021
|
| |
|
Wed Apr 28 09:12:47 2021, Jan, Yuri, Detectors, UI-diagram, 2021
|
The UI-curve of the detector
U I
10 0.11
|