************************************
GEM1800 @ 90deg (xray1) 
GLP2000 @ 35deg (xray2)
GEM3000 @ 145deg (xray3)
************************************

Was noted wrongly in most calib runs.

The by Jacobus Swartz created table in entry 335 extended by the calibration after the experiment.

Attached is the exported Telegram chat.
There is the simple PDF and the zip-file containing the chat in json-format as well as all media files.

measured beam lifetime after the second deceleration using parallel plate Schottky detector and the RSA5103 spectrum analyser. Analysis code can be found here:

https://github.com/xaratustrah/e127_scripts/

The plots here were produced using the script:

https://nbviewer.ipython.org/github/xaratustrah/e127_scripts/blob/main/lifetime_calculator.ipynb


UPDATE 2022-06-30:

Life times have been slightly corrected. Please see attachment.


Filename	Start Frame	Correct Lifetime [s]	Mean [s]
pgamma_lifetime-2021.05.25.21.56.37.593_on.tiq	29500	1.43	
pgamma_lifetime-2021.05.25.22.02.16.618_on.tiq	29500	1.55	1.49
pgamma_lifetime-2021.05.25.22.07.22.369_off.tiq	53500	1.75	
pgamma_lifetime-2021.05.25.22.13.24.787_off.tiq	34900	1.89	1.82

For the x-ray detectors, efficiencies have been measured, before and after the experiment was performed. 
The preliminary results of the determined efficiencies can be seen in the attached plots 

The unpacker used for the production runs of E127b is located at 
/u/litv-exp/unpacker/unpackexps/e127_TO_2021_with_ECL

It is also aliased for litv-exp user as: E127_unpack

This is for the data structure as documented here:
https://elog.gsi.de/esr/E127/346

As of now, this is compiled for ROOT v6-18-04 located here:
/cvmfs/csee.gsi.de/root/618-04/bin/root

Below are the results from the e-cooler voltage offset measurments done by Regina Hess et al. using the voltage divider (VD).

--7 MeV-- 
Sollwert GECEBG1E: 4008.3 V     
Measured at VD: 3913 V
Offset: -95.3 V

--6 MeV-- 
Sollwert GECEBG1E: 3460.5 V     
Measured at VD: 3364 V 
Offset: -96.5 V

Below are the cooler parameters from ParaModi for our production runs.

--7 MeV/u--
UE: 3842.7V
IE: 50mA
BG1E: 4008.7V
BG1E dU: 120V

--6 MeV/u--
UE: 3290.833V
IE: 50mA
BG1E: 3460.4809V
BG1E dU: 120V

--energy calculation--
as described here 

-- uncertainty --
for E108b we agreed on 10%
maybe further discussion is needed

Attached are the theory K-REC cross sections as calculated by Andrey Surzhykov (August 2021).

They are done for 118Te52+ on H2 at 7.049 and 6.042 MeV/u as well as for 124Xe54+ on H2 at 7.049 MeV/u.


first column - photon angle (deg), second column - cross section (barn/sr). The results are given already in the laboratory frame.

Comment of Andrey on uncertainty:
Important question about theoretical model and, hence, accuracy of calculations. I used slightly improved "impulse approximation" that takes into account momentum and energy distribution of target electron (in initial state). By playing with the models for the Compton profile of target electron, I estimate the accuracy of calculations as 1 %. To be fair, it is rather conservative estimate. I suspect that for large emission angle (around 90 deg) accuracy is even better. But let us stay with 1 %. 

Attached is the header file needed for root analysis.

open file : run094

beam: 124Xe54+
energy: 10 MeV/u

purpose: data with TARGET ON and SCRAPER in scraping poisition--> We expect to cut the Rutherford for now on.

at the 3. shoot counting backwards from the end of this file the TARGET LEFT ON for the whole cycle --> got a burst of particles on the detector in 
Target ON Mode as well. --> CUT OUT THIS ONE 1min PHASE!

Detector position (Si): -27 mm
GE01DD1IG position (Scraper): 9 mm

run start at 08:15, first file: run094_0001.lmd
run stop  at 08:17, last file:  run_094.lmd

_______________________________________________________________________________

time: 08:10

ON Rates
Si_X:       2 Hz
Si_Y:       2 Hz
Xray_35:    5 Hz
Xray_90:    84 Hz
Xray_145:   18 Hz
BaF_OR:     ---

Si voltage:          60.02 V  
Si leakage current:  4.32 uA


SIS particles before:           2.5e8
ESR current at injection:       4.5e7
ESR particles after decel.:     1e7
Target ON density:              3.8e13

copy and repeat the above (below the line) every 30 minutes

• measurement
  d1 = moved back from beam = 15 +/-.5 mm
  d2 = DSSSD frame width = 8.85 mm
  d3 = pg center on DSSSD = 7-7.5 bin = 21.7-23.2 mm = avg = 22.5 mm
  
  --> pg from beam in x = -46.4mm +/- 1.5mm
  --> pg on DSSSD from center ~ -3.28mm +/- 1.5mm
  
  
• simulation
  x = -46.5 mm
  y = 0 mm
  
  
• detector active area position
  x = (-73.35mm) - (-23.85mm)
  y = (-14.2195mm) - 23.5125mm
  
  
• SCRAPING: x=-35mm +/-0.5mm away from beam
  y=(-20mm) - (40mm)
  
  

• measurement
  d1 = moved back from beam = 16 +/-.5 mm
  d2 = DSSSD frame width = 8.85 mm
  d3 = pg center on DSSSD = 7.5 bin = 23.2 mm
  
  --> pg from beam in x = -48.05mm +/- 1.5mm
  --> pg on DSSSD from center ~ -3.28mm +/- 1.5mm
  
  
• simulation
  x = -48 mm
  y = 0 mm
  
  
• detector active area position
  x = (-74.35mm) - (-24.85mm)
  y = (-14.2195mm) - 23.5125mm
  
  
• SCRAPING:
  x=-35mm +/-0.5mm away from beam
  y=(-20mm) - (40mm)
  
  
  

Attached are the spec sheets and design drawings of the new DSSSDs from Micron.
Additionally, the 3D model made by Laszlo is also attached as stp and dwg.

General remarks to the MOCADI simulations:

1. scraper size vertically > (p,g) spot at the scraping position --> (p,g) can be separated by truncating the backscattered Rutherford events in the energy.


2. replacing the atomic masses to nuclear masses does not change significantly the absolute positions of the (p,g) and the Rutherford. However, the (p,g) spot in the simulation seems bigger using the nuclear masses, than in the 124Xe experiment with a factor ~1.6.


3. going for lighter elements, the separation between (p,g) and Rutherford getting better, than slit can be placed even more far from the beam in x (radial) direction. For 124Xe the minimal distance from the beam axis is <4cm, for 73As it is <7.5cm.


4. in the simulations the scraping is mostly until x=-inf. However, if the scraping is incomplete in x, we can end up with underlying background events below the p,g peak (see the last slides)! The Rutherford cone gets bigger by going down with A,Z. For 91Nb the minimal width of the scraper: x>6cm, for 73As x>7cm. Therefore, I suggest to have a scraper width x=9cm. For the y, y=6cm should be safe.


5. for lighter elements, the (p,g) spot size increases: in the simulation for 73As it reaches the detector size. However, the (p,g) spot size might be overestimated, please read the 2. point.

A publication on scraping systems suggested by Siegbert. 
In the study they have used cylindrical "high-quality" slits. "High-quality" stands for well polished surface
with surface roughness <50nm. The material of the slit is Tungsten Carbide. 

We now have a drasi DAQ running for our (p,g) experiments.
The RIO we have it installed right now is: r4l-58
It shall be used with the user <litv-exp>

The DAQ-controle shall be done from lxg1275 inside a SCREEN SESSION named "daq"
tab 0 >> drasi 
tab 1 >> logger
tab 2 >> rate
tab 3 >> stream server
tab 4 >> file writing (optional)

To check and control running daq:

login on lxg1275
> ssh litv-exp@lxg1275

enter screen session
> screen -x daq

DRASI
go to tab 0
> ctrl-a 0 
should be quite, no errors showing, no terminal outputs
full restart proceedure
> ssh r4l-58
> cd esrdaq_2018/r4l-58
> ./start.sh (for det. triggered daq)
> ./pulser.sh (for internal pulser trigger)
> ctrl-c (for killing daq)

LOGGER
go to tab 1
> ctrl-a 1
should be quite, no errors showing, no terminal outputs
full restart proceedure
> ssh r4l-58
> cd esrdaq_2018/r4l-58
> ./logger.sh

RATE MONITOR
go to tab 2
> ctrl-a 2
rates should update each second
"incr" should be event rate per sec 
"send" column should be reasonable value if data is written
full restart proceedure
> ssh r4l-58
> cd esrdaq_2018/r4l-58
> ./rate.sh

EMPTY STREAM SERVER
go to tab 3
> ctrl-a 3 
empty stream should be running  
number of processed events should keep increasing
you should see the number of clients connected
full restart proceedure (on lxg1275)
> empty stream://r4l-58 --server=stream:6002

WRITE A FILE
can be done by litv-exp from any lgx-machine
ROOT FILE:
> e127_unpack --stream=lxg1275 --ntuple=RAW,/data.local1/e127/pre_data/file.root
LMD FILE:
> e127_unpack --stream=lxg1275 --output=/data.local1/e127/pre_data/test.lmd