Thu Mar 3 17:21:26 2022, Rodolfo, Detectors, MgF2 Windows
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New reentrance viewports made of MgF2 have been installed at the ESR "Optical Detection Region". In the middle the old window (also MgF2) was kept into place. |
Thu Apr 7 14:01:22 2022, Sebastian, Max, Detectors, Mesytec reset
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The Mesytec crate was turned off and on again.
It is again possible to communicate with the XUV detector via python to apply voltage and current. |
Mon Mar 21 21:48:46 2022, Jan, DAQ, MesyTec Shaper Control
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The MesyTec Shaper & Constant Fraction (MSCF) is used to process the PMT/det signals for the ADC in the second DAQ.
It can be setup on its front panel, but single channel setup is very tedious.
Remote control of the settings is possible using an epics server and client.
All of the following is done with the "litv-exp" user:
server: atpnuc001 (in the screen session "E142")
client: lxg1275
The server should run undisturbed, but in case of a power failure, you can start the server like this:
> ssh litv-exp@atpnuc001
> cd e142
> ./E142_start_ioc.sh
To check server:
> ssh litv-exp@atpnuc001
> screen -x (CTRL-a CTRL-d to leave screen)
To connect the client gui for remote control, do:
> ssh litv-exp@lxg1275
> E142_epics
The panel is more or less self-explaining.
One thing has to be noted: the Monitor Channel selection is shifted by -1.
I.e., [ch 1] is button [0], etc.
The MSCF settings can be stored and loaded to/from file by using a bash-script.
The settings will be saved/loaded from:
/u/litv-exp/e142/mscf_settings/
files names are "setting_e142.<linux_timestamp>"
The scripts are also in /u/litv-exp/e142/mscf_settings/
use
./mscf_save.sh for saving the current settings to a new file
use
./mscf_load_last.sh to load the last settings file (by timestamp in the filename)
use
./mscf_load_file.sh <filename> to load the settings of a specific file |
Thu Apr 7 03:44:21 2022, Patrick, DAQ, Measurement procedure
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Measurement procedure
- The laser hits the screen 'NO' (atppc017) right side of the burn spot
- Be ready to start a laser scan
- Scan laser goes into wavemeter!
- Have mbs connected
- Have go4 connected
Preparation done
- 'open file (...)' for DAQ1 & DAQ2
- request a new beam
- check scraping
- 'sta ac' for DAQ1 & DAQ2
- start laser scan
laser scan started
- 'sh ac' for DAQ1 & DAQ2
- check that acquisition is RUNNING and file is OPENED
- fill in table information in the ELOG.
laser scan complete
- 'sto ac' for DAQ1 & DAQ2
- 'close file'
- check if preparation is still fulfilled
- repeat from Preparation done |
Sun Apr 3 12:31:10 2022, Rui-Jiu Chen, Yuri, Carsten, Ragan, Runs, Measurement of beam with different circles 6x
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Parameters of NTCAP:
1. IQ rate 20 MSamples/s
2. Carrier frequency: 245 MHz
3. RF attenuation(dB): 40
4. IF attenuation(dB): 19.9288
Data files:
Samples/record: 2^18=262144
Records/File:2^12=4096
Masterpath:
p:/E142/iq
p:/E142/sc
1. Manipulation 1:
(ESR EXP22 02 238U92 Brandau 30March22.C1.3 WAIT FOR MANIP BY. OF O)
Data A: IQ_2022-04-03_11-37-01, SC_2022-04-03_11-37-01
Data B: IQ_2022-04-03_11-46-54, SC_2022-04-03_11-47-04
2. Manipulation 2:
(ESR EXXP22 02.23U92 Brandau SOMarch22.CIS WAIT FOR MANI BY OP O )
Data A: IQ_2022-04-03_11-56-17, SC_2022-04-03_11-56-17 (Reference level 0dBm)
Data B: IQ_2022-04-03_12-03-27, SC_2022-04-03_12-03-27 (Reference level 0dBm)
Data C: IQ_2022-04-03_12-58-00, SC_2022-04-03_12-58-00 (Reference level -25dBm, record data
for long time.)\
3. Manipulation 3:
(ESR EXP22 02 23AUS2 Branda3OMarch22C1.7 WAIT FOR MANIP BY OP)
Data A: IQ_2022-04-03_12-11-11, SC_2022-04-03_12-11-11 (Reference level 0dBm)
Data B: IQ_2022-04-03_12-18-49, SC_2022-04-03_12-18-49 (Reference level 0dBm)
4. Manipulation 1+2+3. Measuring two injections.
Data A: IQ_2022-04-03_12-26-47, SC_2022-04-03_12-26-47(REFERENCEL LEVEL 0dBm)
Data B: IQ_2022-04-03_12-26-55, SC_2022-04-03_12-26-55(Reference level -25dBm)
Preliminary result: comparison between manipulation (MP) 1,2,3 and full manipulation
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Mon Apr 4 09:10:44 2022, Ragan, Yuri, Rui-Jiu, Runs, Measurement
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NTCAP is taking data with the beam with a stop at manipulation 5 (taking all the fragments).
1)
Start time: 09:07
Stop time: 11:31
Reference level: -25 dBm
SC_2022-04-04_09-07-57
IQ_2022-04-04_09-07-57
2)
Start time: 11:35
Stop time: 14:00
Reference level: -25 dBm
SC_2022-04-04_11-35-25
IQ_2022-04-04_11-35-25 |
Thu Apr 14 10:57:11 2022, Carsten, Accelerator, Maintanence UNILAC / Op training
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We had no beam since about 1000. Also, we are still trying to find out why we have such a low intensity in the expereimnt.
Presently, there is a planned maintenance in the UNILAC, beam is expected back in 25-30 mins.
The profile grid TE3 in the transfer beamline in front of the target will be used to check if the extracted SIS beam has changed compared to before the crash of the SIS.
All devices in the ESR seem to work normally including ramping of cooler current/voltage, dipole correction windings and sextupoles (all checked).
As we observed that coolng performace after injection is much worse Markus (Steck) suggested that we could try a longer manual cooling in machine 3 (pleae no cahnges in timimng) to see whether the SIS energy has changed (similar to about 1 week ago).
Cooler elctron current iis put back to 450ma (inejection / 40mA measurement). |
Fri Mar 18 16:51:27 2022, Carsten, DAQ, Main DAQ /MBS error
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MBS error "TDC data ready wait" solved. Common stop trigger (20 kHz) was missing. (according to Sebastian) |
Mon Apr 4 17:26:48 2022, Jan Glorius, DAQ, MSCF shaper settings
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attached are the current shaper settings.
list of currently connected channels:
ch2: mid x1
ch4: Cu x1
ch6: mid x2
ch8: Cu x2
ch9: XUV x1
ch10:XUV x2 |
Tue Apr 5 08:00:50 2022, Kristian & Sebastian, DAQ, MBS Channellist (so far)
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MBS Channellist (time 5.4.2022)
0 Anode
1 Front
2 Back
3 PMT Süd
4 PMT Mitte
5 PMT Nord
6 PMT Cu
7 Par Det Süd
8 Par Det Nord
9 1kHz from clock generator ???
10 empty
11 empty
12 delayed common stop ???
13 PD NO
14 PD SO
15 Q-Switch
16 DC Trafo
17 Injection
18 U-Ecool
19 I-Ecool
20 P-Gun
21 P-Coll
22 Divided RF
23 1 Mhz Clock
24 empty
25 empty
26 empty
27 dye out (1MHz)
28 empty
29 detector in (1MHz)
30 Laser step complete
31 Laser scan complete |
Sun Apr 10 03:56:56 2022, V. Hannen, Detectors, Low rate in PMT South
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PMT south shows a much lower count rate than observed in elog entry 170.
Yesterday the voltage on this PMT was increased to 2400 V and the threshold setting of the CAEN CFD to 90 units, (from 70 units before) however the low readout rate was already apparent both for the analog and the discriminated signal then.
Update Sun Apr 10, 21:45: on advice from D. Winters, increased the PMT voltage to 2500 V (max. the HV supply can do, the PMT could handle up to 3000 V) |
Thu Apr 14 08:41:42 2022, Carsten, Accelerator, Low intensity at the experiment after series of failures during the night
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After the recovery from the failures during the night, we see much lower intensity at the experiment (measured with the particle detector count rate).
Instead of 8000-10000 cts we see only 3000-4000cts at comparable SIS intensities.
Also ESR cooler seems to be slightly unstable (wiggling lines) during injection. However, it is visually evident from the Schottky that the injected intensity already is much lower than yesterday evening.
All devices in ESR are (seem to run ) runnng properly, and also slit position (PN devices) are ok.
I am going to open the slits iin the SIS ESR transfer beamline. It would be useful to check for the SIS-ESR timing. |
Tue Apr 5 23:55:11 2022, Carsten, Runs, Long time measurment with NTCAP
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Settings:
Center: 2242.5MHz
RefLevel: -25dB
Rate 15 MIQs
File Numbers: 2022_04_05 23-46-22
Please note that the file started one minute earlier had wrong settings.
File contains also injection, paused in machine #5: ramped to central orbit / not yet bunched.
The measurement does not represent the later settings since here hte 229Th89+ is still on a too inner orbit (cf. previous post).
The beam settings can also be found in the previous post. |
Fri Nov 19 15:50:44 2021, Rodolfo, Accelerator, Laser windows at E-Cooler side
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New laser viewports have been installed at the E-Cooler side of the ESR.
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Fri Apr 8 02:14:05 2022, Wilfried, Laser, Laser timings adjusted
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Since we use the middle window as a reference for the laser pulse timing, the fact that the window is 2.25 m behind the target has to be taken into account. From here the ions have 10 ns less time of flight to the middle of the electron cooler than they need for half a revolution. The signals were still symmetrically aligned around the reference bunch as it was done yesterday. Therefore, the delay of the laser pulse was reduced by 10-ns on the oscilloscope, which led both photodiode histograms move 3 bins further to the right (towards larger times till common stop, since the pulse arrives earlier).
Since the RF frequency is turned down from ~ 1 MHz to ~ 400 kHz during injection/preparation, the laser does not fire reliably and the beam stabilization does not work very well during this period. This was solved by increasing the window in which the Q-Switch signal is accepted from 2 microseconds to 5 microsececonds. The laser is now firing regularly and with high power also during the preparation time and the beam position stabilization works very well. |
Thu Apr 7 00:15:11 2022, Patrick, Laser, Laser timing adjusted
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We have adjusted the laser timing using PMT-middle. Bunching freq. is 3.90362 MHz.
PD NO: 7.79
PD SO: 43.37
mean: 25.08
PMT middle: 25.02
Delta = 0.6 bins * 3.3 ns = 0.2 ns
New injection:
PMT middle: 25.48 / 101.91
ParDet south: 74.31 / 151.31
ParDet south - PMT middle (furthest / closest distance) = 161.1 ns / 91.1 ns |
Tue Mar 29 12:01:08 2022, Rodolfo, Laser, Laser targets
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I have installed two targets* (size: 2 inches) to monitor the position of the laser beam.
- The internet cameras can be accessed from any browser, but only inside the GSI-Campus network. Benutzername: admin. Kennwort: 1234
- Target SO (UV-Laser IN). Internet camera: atpdev005.gsi.de **
- Target NO (UV-Laser OUT). Internet camera: apdev17.gsi.de
- To move a specific target "in" or "out" the way just choose the target in the "target control box" and press the green bottom.
* The material of the target is Frosted Glass (Thorlabs: DG20-15ß00-H2-MD).
** The camera hang sometimes. |
Sat Apr 9 06:42:23 2022, Kristian, Laser, Laser step size
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We changed the laser step size to 0.002 nm which corresponds to 5.75 GHz. |
Tue Apr 12 15:05:56 2022, Rodolfo, Laser, Laser status
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We have checked the laser power at 14:15 *
- Pump energy after Q-Ray @ 532nm: 559 mJ.
- Seed energy for Cobra @ 532 nm: 505 mJ (before 481 mJ).
- Correction factor for monitor: 28.8.
- UV-Energy after SHG @ 321.6 nm: 13.7 mJ.
* All values are averaged over 500 shots |
Wed Apr 13 15:41:29 2022, Rodolfo & Sarper, Laser, Laser status
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We have checked the power of the laser and optimized it "a bit".
- Seed energy for the Cobra @ 532 nm: 508 mJ (before 496 mJ)*
- New correction factor for the Monitor: 43.
- UV energy after the SHG @ 321.1 nm: 11.6 mJ*
*Average over 500 pulses. |