Attached are plots for Si-pad 2 with hits from ionization of 206Pb81+ at the target.
The plots are representative for all Si-pads, the pattern is always the same!

y-axis: E n-side
x-axis: E p-side strip
condition: E_gate on peak in CsI

While strips 1, 2 and 7 look fine, strips 3 and 6 show already signs of degradation. 
For strips 4 and 5, it is clearly visible that something is wrong.
Those are the central strips, which probably see the most rate.

The same dataset was analyzed here: https://elog.gsi.de/esr/E121/62

This might be a hint to a radiation damage or to the fact that we operate at too low bias voltage (32 Volt).
Maybe it recovers if we increase bias to 60 Volt.

Run start: 0276.lmd

I analyzed the first measurement with 206Pb81+ beam, run 250-267. 

Below in the schottky spectrum, on left is 203Tl80+ contamination, in middel is 200Hg79+ contamination and on right most is 205Tl81+.
These contaminations cannot be seen on CsISiPHOS but can only be seen on schottky.
The goal now is to get rid of these contaminations by putting slits.

203Tl80+ impurity is removed by moving scrapper inside ESR.
Only 220Hg79+ is left now

It can be seen in the video how 203Tl80+ (on extreme left) and then 200Hg79+ (in middle originally) is separted from 205Tl81+ by using scrapper in ESR.
Now, we want 205Pb81+ mixed with 205Tl81+ to be separated as much as possible in FRS.

Vc = 212849.9349
Ic = 0.2

1)

Vcc=6400
f= 245.314
Veff= 219218.2989884789
β= 0.7143483279777152 
γ= 1.4289995125817443  


2)

Vcc=6800
f=245.227
Veff= 219618.31558866
β= 0.7147234572628363 
γ= 1.4297823255462372  

3)

Vcc=6000
f=245.404
Veff= 218818.2823347592
β= 0.7139723840585469 
γ= 1.4282166995124788  


Taking 1) and 2):

η : 0.33044950273377705 

αp1: 0.15925696358166558 
αp2: 0.1587208769044816 

Taking 1) and 3):

η : 0.34166460537796267 

αp1: 0.14804186093747995 
αp2: 0.14857882942379202 

Taking 2) and 3):

η : 0.33653854822327256 

αp1: 0.1526318314149861 
αp2: 0.15370488657848214  


αp average: 0.1534892081401479

The detector cable was disconnected . We entered and reconnected the cable.

On 1 April by 5 pm, we could stop the stochastic cooling after the stacking process and also change the orbit of the Tl beam to centre. 
Thanks to the efforts by the ESR team !

beam: 205Tl81+ (with no scraping)
energy: 400 MeV/u
storage time: zero

purpose: data with TARGET ON

Detector position (CsISiPHOS):  out of the ring
Detector position (MWPC):       mm

run start at 01:48 , first file: run0287.lmd
run stop  at xx:xx , last file:  run0xxx.lmd

_______________________________________________________________________________

time: 1:48

I_cooler =  mA


         
ESR particles after stacking:     
Number of stackings: 20
Target ON density:   4.3e12
Target on time: 01:54:34
Target off time: 02:04:34
Target on time for measurement: 10 mins (by local mode)       


NTCAp file:
SC_2020-04-01_16-36-43/0000xxx.iq.tdms
\IQ_2020-04-01_16-36-43/0000xxx.iq.tdms
IQ rate: 8 MS/s
(saved in drive : o)

copy and repeat the above (below the line) for every storage time measurement

beam: 205Tl81+ (no scraping)
energy: 400 MeV/u
storage time: 2 hrs
(In the picture below, it can be seen that the beam cooled. On right most is the Tl beam and rest are the contaminants.)

purpose: data with TARGET ON

Detector position (CsISiPHOS):  out of the ring
Detector position (MWPC):       mm

run start at 01:48 , first file: run0287.lmd
file running:    0287.lmd

______________________________________________________
_________________________

time when accumulation starts: 02:08
time when storage starts: 02:21
time when storage ends: 04:21
I_cooler during storage time: 10 mA

I_cooler =  mA


         
ESR particles after stacking:     
Number of stackings: 20
Target ON density:   3.9e12
Target on time: 04:22:40
Target off time: 04:32:40
Target on time for measurement: 10 mins (by local mode)       


NTCAp file:
SC_2020-04-01_16-36-43/0000xxx.iq.tdms
\IQ_2020-04-01_16-36-43/0000xxx.iq.tdms
IQ rate: 8 MS/s
(saved in drive : o)

copy and repeat the above (below the line) for every storage time 
measurement

Electron cooler was off here. Thus, this measurement is not what we needed.
(in the picture below, it can be seen that the beam is not cooled)


beam: 205Tl81+ (no scraping)
energy: 400 MeV/u
storage time: 2 hrs

purpose: data with TARGET ON

Detector position (CsISiPHOS):  out of the ring
Detector position (MWPC):       mm

run start at 01:48 , first file: run0287.lmd
file running:    0287.lmd

_______________________________________________________________________________

time when accumulation starts: 04:45
time when storage starts: 04:55
time when storage ends: 06:55
I_cooler during storage time: 10 mA

I_cooler =  mA


I_SIS: 1.8e9      
ESR particles after stacking: ~e5  
Number of stackings: 20
Target ON density:   4e12
Target on time: 06:56:30
Target off time: 07:06:30
Target on time for measurement: 10 mins (by local mode)       


NTCAp file:
SC_2020-04-01_16-36-43/0000xxx.iq.tdms
\IQ_2020-04-01_16-36-43/0000xxx.iq.tdms
IQ rate: 8 MS/s
(saved in drive : o)

copy and repeat the above (below the line) for every storage time measurement

beam: 205Tl81+ (no scraping)
energy: 400 MeV/u
storage time: ___ hrs

purpose: data with TARGET ON

Detector position (CsISiPHOS):  out of the ring
Detector position (MWPC):       mm

run start at ___ , first file: run____.lmd
file running:    ____.lmd

_______________________________________________________________________________

time when accumulation starts: __:__
time when storage starts:  __:__
time when storage ends:  __:__
I_cooler during storage time: __ mA

I_cooler =  __ mA


I_SIS: ___      
ESR particles after stacking: ___ 
Number of stackings: __
Target ON density:   _____
Target on time: __:__
Target off time: __:__
Target on time for measurement: 10 mins (by local mode)       


NTCAp file:
SC_2020-04-01______________
\IQ_2020-04-01_____________
IQ rate: 8 MS/s
(saved in drive : __)

copy and repeat the above (below the line) for every storage time measurement

beam: 205Tl81+ (no scraping)
energy: 400 MeV/u
storage time: 4 hrs

purpose: data with TARGET ON

Detector position (CsISiPHOS):  out of the ring
Detector position (MWPC):       mm

run start at 01:48 , first file: run0287.lmd
file running:    0287.lmd

_______________________________________________________________________________

time when accumulation starts: 04:45
time when storage starts: 04:55
time when storage ends: 06:55
I_cooler during storage time: 10 mA

I_cooler =  mA


I_SIS: 1.8e9      
ESR particles after stacking: ~e5  
Number of stackings: 20
Target ON density:   4e12
Target on time: 06:56:30
Target off time: 07:06:30
Target on time for measurement: 10 mins (by local mode)       


NTCAp file:
SC_2020-04-01_16-36-43/0000xxx.iq.tdms
\IQ_2020-04-01_16-36-43/0000xxx.iq.tdms
IQ rate: 8 MS/s
(saved in drive : o)

copy and repeat the above (below the line) for every storage time measurement

Because the electron cooler was not switched on during beam accumulation in the previous measurement, we repeat this measurement again.
(In the picture below, it can be seen that the beam cooled. On right most is the Tl beam and rest are the contaminants.)

beam: 205Tl81+ (no scraping)
energy: 400 MeV/u
storage time: 2 hrs

purpose: data with TARGET ON

Detector position (CsISiPHOS):  out of the ring
Detector position (MWPC):       mm

run start at 08:46 , first file: run290.lmd
file running:   run290.lmd


time when accumulation starts: 09:06
time when storage starts:  09:16
time when storage ends:  10:59
I_cooler during storage time: 10 mA

I_cooler =  __ mA


I_SIS: 1.7e9      
ESR particles after stacking: 1e6
Number of stacking: 20
Target ON density:   3.9e12 atoms/cm2
Target on time:  11:00
Target off time: 11:10
Target on time for measurement: 10 
mins (by local mode)       


NTCAp file:
SC_2020-04-02_07-10-40
\IQ_2020-04-02_07-11-48
IQ rate: 8 MS/s
(saved in drive : p)

copy and repeat the above (below the 
line) for every storage time 
measurement

Yuri sets up FRS with 2 g/cm2 degrader (previous one is 1 g/cm2). The ESR is not changed. The contamination should be less now.

For Alle and Kuehler the bottom left status should look like as shown in pictures below.

beam: 205Tl81+ (no scraping, Al ~1g/cm2)
energy: 400 MeV/u
storage time: zero hrs
S2:-10/35 mm

purpose: data with TARGET ON

Detector position (CsISiPHOS):  out of the ring
Detector position (MWPC):  -60 mm

run start at 19:05 , first file: run0292.lmd (File was started when stacking was ongoing. Maybe not all the stackings could be sen in the analysis.)
file running: 0292.lmd

_______________________________________________________________________________

time when accumulation starts: --
time when storage starts: 19:10
time when storage ends: 19:10
I_cooler during storage time: --

I_cooler =  177 mA


I_SIS: 2.2e9      
ESR particles after stacking: 3.5e6   (offset 1e5)
Number of stackings: ~40 (can be checked on NTCap data)
Target ON density: 3.45e12 
Target on time for measurement: 10 mins (by event mode)       


NTCAp file:
SC_2020-04-02_19-10-21
\IQ_2020-04-02_19-10-14
IQ rate: 8 MS/s
(saved in drive : p)

copy and repeat the above (below the line) for every storage time measurement

beam: 205Tl81+ (no scraping, Al ~1g/cm2)
energy: 400 MeV/u
storage time: 1 hrs
S2:-10/35 mm

purpose: data with TARGET ON

Detector position (CsISiPHOS):  out of the ring
Detector position (MWPC):  -60 mm

run start at 19:05 , first file: run0292.lmd 
file running: 0293.lmd

_______________________________________________________________________________

time when accumulation starts: 19:23
time when storage starts: 19:36
time when storage ends: 20:36
I_cooler during storage time: -1 mA

I_cooler =  177 mA


I_SIS: 2.2e9      
ESR particles after stacking: 2.6e6   (offset 1e5)
Number of stackings: 30
Target ON density: 3.44e12 
Target on time for measurement: 10 mins (by event mode)       


NTCAp file:
SC_2020-04-02_19-10-21
\IQ_2020-04-02_19-10-14
IQ rate: 8 MS/s
(saved in drive : p)

copy and repeat the above (below the line) for every storage time measurement