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  proton-capture on 118Te, Page 12 of 29  Not logged in ELOG logo
ID Date Author Category Subjectdown Year
  268   Wed Mar 25 15:06:09 2020 LaszloAnalysisquick summary of the run numbers 
  186   Sun Mar 22 12:53:43 2020 LaszloGeneralquick summary for the 118Te overnight measurement 
Quoting Yury:
"The count rate is very low. We estimate that we store about 10^4 118Te particles at 10 AMeV. This is a very low number.
On Saturday we re-implemented the recoil setup (MCP from Pierre-Michelle) from the previous experiment and could verify the overlap between the stored beam and the gas-jet.
In the evening the intensity has been optimized and we are running presently with stable 1.5-2 10^9 particles extracted from the SIS. Indeed, another factor 2-3 would be great.
We had to work on the gas-jet target density which significantly dropped."
Yesterday evening we started with gas jet-denisity  of ~7E13 which dropped during night to ~2E13. 

We have overall on the targetON Si position histo 57 counts. Form these I estimated based on the 124Xe measurement like very roughly 21% Rutherford, 63% pn, and 6% pg counts. For the number of pg this would mean 3.4counts, I can see now like 2 (bin (6,6) and bin (6,7))

To only good news that the scraper seems to work, althought the 2 bins at (6,12) and (6,15) I don't understand now.

Also we can see some tiny peaks in the Xray spectra. The tininess can be explained due to the low number of ions in the ESR.
  404   Sun May 23 02:16:47 2021 LaszloGeneralquick comparison between different scraping positions2021
So far we did 3 scraping positions:
- 30mm away from beam axis (lmd72-75)
- 25mm away from beam axis (lmd78-80)
- 20mm away from beam axis (lmd76-77)

below one can see the comparison of the scrapings for the DSSSD spectrum. Please mind the different amount of data collected
  462   Wed May 26 07:08:07 2021 LaszloCalibrationquick and dirty calibration coefficients for the Si channels2021
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

from 1-16: Si X channel
from 17-32: Si Y channel

S_param[1]=1;
S_param[2]=1.00953;
S_param[3]=1.00697;
S_param[4]=1.00506;
S_param[5]=0.985741;
S_param[6]=1.00338;
S_param[7]=0.998362;
S_param[8]=1.00424;
S_param[9]=0.998684;
S_param[10]=1.00029;
S_param[11]=1.01181;
S_param[12]=1.007;
S_param[13]=1.00927;
S_param[14]=1.00828;
S_param[15]=1.01399;
S_param[16]=0.995168;
S_param[17]=1.00612;
S_param[18]=1.01383;
S_param[19]=0.99964;
S_param[20]=1.03;
S_param[21]=1.00987;
S_param[22]=1.01913;
S_param[23]=0.993491;
S_param[24]=1.02393;
S_param[25]=1.00342;
S_param[26]=0.990515;
S_param[27]=0.986303;
S_param[28]=0.986874;
S_param[29]=1.00188;
S_param[30]=1.01761;
S_param[31]=0.995329;
S_param[32]=0.995247;
  65   Thu Mar 19 19:14:40 2020 LaszloGeneralprimary beam measurement 
Now our aim is to decelerate the primary beam (naked 124Xe) down to 10MeV/u. At this energy we can test our detectors and that how the scraping works. In addition, in the E108b experiment, 124Xe(p,g), there is no measurement point at 10MeV/u.
  27   Fri Oct 25 16:34:51 2019 JanRunsprerun007 - MixedAlpha 
save point: lxg1275:/datalocal1/e127/predata/prerun007

start: Fr 25.10.19 - 16:35 
stopp: 

DAQ setup:
64 ADC channels
 ch. 01-64 (ADC0) >> empty
 ch. 33-48 (ADC1 - section0) >> x-strips
 ch. 49-64 (ADC1 - section1) >> y-strips
32 TDC channels
 ch. 01-64 (TDC0) >> empty
 ch. 33-48 (TDC1 - section0) >> x-strips
 ch. 49-64 (TDC1 - section1) >> y-strips
64 scaler channels 
 (not used)

Detector setup:
bias -30V
MixedAlpha source in center
  24   Wed Oct 23 11:40:29 2019 JanRunsprerun005 - MixedAlpha 
save point: lxg1275:/datalocal1/e127/predata/prerun005

start: 23.10.19 - 11:40 
stopp: 23.10.19 - ~13:30

DAQ setup:
32 ADC channels
 ch. 1-16 (section 0) >> x-strips
 ch. 17-32 (section1) >> y-strips
32 TDC channels
 ch. 1-16 (section 0) >> x-strips
 ch. 17-32 (section1) >> y-strips
32 scaler channels 
 (not used)

Detector setup:
bias -30V
MixedAlpha source in center
  10   Fri Jun 7 14:28:09 2019 JanRunsprerun003 - MixedAlpha 
save point: lxg1275:/datalocal1/e127/predata/prerun003

~20min run

DAQ setup:
32 ADC channels
 ch. 1-16 (section 0) >> y-strips
 ch. 17-32 (section1) >> x-strips
32 TDC channels
 ch. 1-16 (section 0) >> y-strips
 ch. 17-32 (section1) >> x-strips
32 scaler channles 
 (not used)

Detector setup:
bias -90V
MixedAlpha source in lower right corner
  13   Tue Jun 11 10:13:56 2019 JanRunsprerun003 - MixedAlpha 
save point: lxg1275:/datalocal1/e127/predata/prerun004
~10min run

DAQ setup:
32 ADC channels
 ch. 1-16 (section 0) >> y-strips
 ch. 17-32 (section1) >> x-strips
32 TDC channels
 ch. 1-16 (section 0) >> y-strips
 ch. 17-32 (section1) >> x-strips
32 scaler channles 
 (not used)

Detector setup:
bias -90V
MixedAlpha source in center
new air-side cable used (with temp. sensor)
  9   Fri Jun 7 13:52:32 2019 JanRunsprerun002 - MixedAlpha 
save point: lxg1275:/datalocal1/e127/predata/prerun002

~20min run

DAQ setup:
32 ADC channels
 ch. 1-16 (section 0) >> y-strips
 ch. 17-32 (section1) >> x-strips
32 TDC channels
 ch. 1-16 (section 0) >> y-strips
 ch. 17-32 (section1) >> x-strips
32 scaler channles 
 (not used)

Detector setup:
bias -90V
MixedAlpha source in upper left corner
  8   Fri Jun 7 10:18:23 2019 JanRunsprerun001 - MixedAlpha 
save point: lxg1275:/datalocal1/e127/predata/prerun001-root

~2h run

DAQ setup:
32 ADC channels
 ch. 1-16 (section 0) >> y-strips
 ch. 17-32 (section1) >> x-strips
32 TDC channels
 ch. 1-16 (section 0) >> y-strips
 ch. 17-32 (section1) >> x-strips
32 scaler channels (not used)
16 MDPP channels (not used)

Detector setup:
bias -90V
MixedAlpha source ~in central position
  118   Sat Mar 21 11:25:47 2020 Laszlo possible misalignement between target and fragment beam 
after 9hours of measurement we see only 19 counts on our targetON silicon detector histo. this low count rate can indicate two scenarios:
-we have a mismatch between the beam and the target (not much if any overlap)
-mabye the very low intersity of the beam (we cannot really monitor this, there are only estimates...)

Which tells us that we dont intersect with the target, that on the Xray spectras we dont see any peaks at 90 and 145 angles. There are two peaks in 35 angle, but they are maybe only from Pb conversion 75keV, etc...
  7   Wed Jun 5 11:29:13 2019 JanDetectorsposition/channel calib. 
This is the first position calibration done with the detector installed in the holder. The goal is to assign rough positions (top/bottom/left/right) to PreAmp- and Shaper-channels.


PreAmp Channel polarity position
1-1 (Y-1) neg. bottom
1-16 (Y-16) neg. top
2-1 (X-1) pos. left (close to beam)
2-16 (X-16) pos. right (far from beam)
  Draft   Fri Aug 9 13:14:09 2019 Laszlo pn channel simulations for 111Sn(p,g)112Sb experiment 
The p,n channel opening for the 111Sn+p reaction is at 5.8895 MeV/u beam energy. Therefore, when choosing as 6MeV/u, 7MeV/u, 8MeV/u beam energies, there is not much kinetic energy left for the outgoing neutron --> there are "less" nuclear levels populated above groundstate in 111Sb, they can be handled explicitly. My simulations are based on TALYS results. The following steps did I made:

1, choose an energy for the 111Sn beam. for this example let it be 8AMeV. 
  20   Fri Aug 9 13:43:15 2019 LaszloSimulationspn channel simulations for 111Sn(p,g)112Sb experiment 
The p,n channel opening for 111Sn beam is at 5.8895 MeV/u beam energy. Therefore, when choosing 6MeV/u, 7MeV/u,
8MeV/u beam energies, there is not much kinetic energy left for the excitation of the 111Sb nucleus --> there
can be "less" nuclear levels populated above groundstate of 111Sb. These "less" states can be handled explicitly
(no continuum levels) with the TALYS code. I make the following steps to simulate the (p,n) products for a given
energy:

1, choose an energy for the 111Sn beam. for this example let it be 8AMeV. Then I use my energy calculator:

/u/lvarga/public/lab2cm_updated 111Sn 8

this gives the last output: " equvivalent (E_lab)^rel for p in talys = 8.06689 MeV ". This energy is the value
what i should put into TALYS as the p projectile energy. In TALYS we have only normal kinematics.

2, make the calculation with the TALYS code for outpopulation, outgamdis and outangle. For the first two cases,
an extra command is given: "maxlevelsbin n 30" to get discrete levels.

3, based on the outpopulation and outgamdis I create an excellsheet which tells me the probability of decay
happening after the n-emission.
   from outpopul, I can tell which level is populated in which % after the n-emission. (using the cross sections
and normalizing to the summed cross section)
   from outgamdis, I can tell that for a specific level after the n-emission what is the probability of the
decay afterwards. (using the cross sections given). 

4, regarding outangle, the cross sections are given for each 2. degree angle only. To get a continuous
dependency, I fit these with a 6. order polinomial function for each level. Later on, I use this polinomial
function for angular corrections.

5, for each decay scheme, I make a MOCADI code. For the target, instead of Hydrogen mass, I am using the proton
mass (otherwise, TALYS and MOCADI will not be compatible, ~511keV gap will remain in the CM energy, which of
course highly influencing the kinematics). For the nuclear masses, my calculator can be used:

/u/lvarga/public/atomic2nuclearMass 111Sn

It is important, that after the first n-emission I put a save point (which is the SAVE #1)for the later angular
corrections.

6, I mix the root file outputs from MOCADI based on the probabilities from my excell table. Also angular
corrections can be given using the (180-tof[1]) angle. There is not much difference however, but the computation
time increases dramatically.
//in the simulations at the PIN-diode position there is a scraping edge 3cm away from the beam.
  258   Mon Mar 23 18:15:55 2020 LaszloGeneralnoisy 90degree Xray det 
Uwe found out, that there was some common ground effect between 90 and 145 degree detectors. after moving the grounds, we could record much more nicer (Gaus 
shaped) peaks in the spectra. Now we continue with this settings
  225   Mon Mar 23 06:40:17 2020 ShahabRunsno beam in SIS nor in ESR 
manic Monday morning.
  395   Sat May 22 20:46:19 2021 Laszlo, Pierre.Michel, EnisGeneralnew scraper position2021
The scraper was moved into 2.5mm in absolute which corresponds to 20mm away from the beam axis.

Pressluft Antriebe

Position 1
GE01DD1IG (SC12) 2.5 mm

Position 2
GE01DD1IG (SC9) 2.5 mm
  400   Sat May 22 22:29:48 2021 Laszlo, Pierre.Michel, EnisGeneralnew scraper position2021
The scraper was moved into 7.5 mm in absolute which corresponds to 25 mm away from the beam axis.

Pressluft Antriebe

Position 1
GE01DD1IG (SC12) 7.5 mm

Position 2
GE01DD1IG (SC9) 7.5 mm
  135   Sat Mar 21 17:21:57 2020 LaszloGeneralnew Target density 
Ulli and Nikos managed to set the target density to ~7E13  at 51K temperature

The cycle is checked again, it seems fine.
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