| ID |
Date |
Author |
Category |
Subject |
|
104
|
Mon Mar 30 23:30:35 2020 |
Jan | Analysis | run251 - Si-pad performance & status |
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. |
|
105
|
Tue Mar 31 00:47:18 2020 |
Yuri | Runs | S2 slits 0/+35 mm, target bump +13 mm |
Run start: 0276.lmd |
|
106
|
Tue Mar 31 15:30:43 2020 |
ruijiu | Analysis | The beam position on DSSD with different conditions on on the dEE spectrum |
I analyzed the first measurement with 206Pb81+ beam, run 250-267. |
|
107
|
Tue Mar 31 20:32:05 2020 |
Ragan | General | 203Tl80+ 200Hg79+ 205Tl81+ |
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. |
|
108
|
Tue Mar 31 20:50:05 2020 |
Ragan | General | 200Hg79+ 205Tl81+ |
203Tl80+ impurity is removed by moving scrapper inside ESR.
Only 220Hg79+ is left now |
|
109
|
Tue Mar 31 21:07:05 2020 |
Ragan | General | Separation of 203Tl80+ and 200Hg79+ using scrapper in ESR |
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. |
|
110
|
Tue Mar 31 23:31:41 2020 |
Shahab | Runs | alpha_p calibration |
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 |
|
111
|
Wed Apr 1 01:02:24 2020 |
ruijiu | Detectors | the detector cable is disconnected. |
|
|
112
|
Wed Apr 1 01:05:36 2020 |
ruijiu | Detectors | detector position fixed at 60 mm |
The detector cable was disconnected . We entered and reconnected the cable. |
|
113
|
Thu Apr 2 02:36:48 2020 |
Ragan | General | Stochastic cooling and orbit problem |
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 ! |
|
114
|
Thu Apr 2 02:38:32 2020 |
Ragan, Yuri, Sergey, Esther, Oliver | Runs | First measurement with zero storage time |
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 |
|
115
|
Thu Apr 2 02:46:57 2020 |
Ragan, Yuri, Sergey, Esther, Oliver | Runs | Measurement with 2 hrs storage time |
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 |
|
116
|
Thu Apr 2 05:00:44 2020 |
Ragan, Esther, Oliver | Runs | Second measurement with 2 hrs storage time |
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 |
|
117
|
Thu Apr 2 06:25:13 2020 |
Ragan | Runs | Template |
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 |
|
118
|
Thu Apr 2 07:01:32 2020 |
Ragan, Esther, Oliver | Runs | Measurement with 4 hrs storage time |
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 |
|
119
|
Thu Apr 2 09:21:19 2020 |
Ruijiu | Runs | 2nd measurement with 2 hrs storage time (repeat) |
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 |
|
120
|
Thu Apr 2 12:52:25 2020 |
ruijiu | General | setup FRS with 2 g/cm2 degrader. |
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. |
|
121
|
Thu Apr 2 15:24:15 2020 |
Ragan | General | How to know whether electron cooling is working |
For Alle and Kuehler the bottom left status should look like as shown in pictures below. |
|
122
|
Thu Apr 2 21:03:40 2020 |
Ragan, Yuri, Sergey, Nikos | Runs | Zero hour measurement (S2:-10/35 mm) |
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 |
|
123
|
Thu Apr 2 21:10:57 2020 |
Ragan, Yuri, Sergey, Nikos | Runs | One hour measurement (S2:-10/35 mm) |
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 |