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  Dielectronic recombination-assisted laser spectroscopy, Page 2 of 6  Not logged in ELOG logo
Entry  Mon May 9 17:14:02 2022, Carsten, DAQ, NTCAP DAQ 
The NTCap DAQ computer in the HKR (Schottky logbook) is started, and all preparations for data taking (mounting of NAS etc.) are done.
Parameters for NTCAP DAQ will be adjusted as soon as beam is available. 
Entry  Mon May 9 17:16:34 2022, Carsten, Accelerator, Important: New ESR pattern - requies action for XUV detector in/out 
The ESR pattern is enhanced compared to the thorium experiment by additional machines that can be  used for cooling/waiting in order to optimize 208Bi yield.
As a consequence, the sub chain numbers (previous: virtuelle Beschleuniger) are changed. The new numbers still have to be dialed in into the devices in the Messhütte and the automatic in/out of the XUV-detector tested-
Entry  Mon May 9 19:05:17 2022, Wilfried, DAQ, Q-Switch signals + 0.5 ms and +1 ms in VUPROM 
We have generated two additional signals which are fed into two VUPROM channels:
Q-Switch + 0.5 ms --> channel 9
Q-Switch + 1.0 ms --> channel 10
(channel numbering 0-15)
The delays are generated by the two channels of a DGG222
Entry  Mon May 9 19:56:41 2022, Zoran, Accelerator, status Monday evening 
The main control room is setting up the SIS for extraction. At the moment there are 2.5E8 particles in the SIS. Later they will check the transport and the devices for the 
ESR injection. The ESR operators might (! no info available) take over later in the evening, but there will definitely be no beam for the experiment before tomorrow morning.

=> the night shift will not take place, unless some laser adjustments need to be done (so far we see no problems)
=> the morning shift does not need to come at 6AM. My guess is that before the morning briefing at 8:30 there will be no news.

The ESR cave is closed again. Talk to the main control room if you need access.
    Reply  Tue May 10 09:05:19 2022, Zoran, Accelerator, status Monday evening 22-05-09_200006_20220509_170137_tcl1024_dcct.png
> The main control room is setting up the SIS for extraction. At the moment there are 2.5E8 particles in the SIS. Later they will check the transport 
and the devices for the 
> ESR injection. The ESR operators might (! no info available) take over later in the evening, but there will definitely be no beam for the experiment 
before tomorrow morning.
> 
> => the night shift will not take place, unless some laser adjustments need to be done (so far we see no problems)
> => the morning shift does not need to come at 6AM. My guess is that before the morning briefing at 8:30 there will be no news.
> 
> The ESR cave is closed again. Talk to the main control room if you need access.

Status SIS on Monday evening. ESR setting up starting on Tuesday morning. There is some prospect of getting more ions by setting up multi-multiturn 
injection, however still uncertain.
Entry  Tue May 10 11:40:55 2022, Sebastian, Accelerator, still no beam @ESR 
There is still no Beam in the ESR.

The beam is currently at TE3 - between SIS and ESR
Entry  Tue May 10 11:59:45 2022, Simon, Christopher, Kristian, Sebastian, Laser, Labview VI checkups 
The lower limit (to position) of the Cobra control VI has to be one increment smaller.
This means for moving from 601,95 to 601,74 the "to position" has to be 601.735.

We also checked the displayed HV values in Go4 with the shown values of the HV VI.

Both values in go4 and in the VI show the same value and are changing "simultaneously" (depending on the refresh time of go4 and Labview).
Entry  Tue May 10 15:26:35 2022, Rodolfo, Max, Laser, Laser stabilisation running MRC_Settings_for_Bismuth_10-05-2022.PNGMRC_hardware_Setting.PNG
It is now possible to stabilize and move the laser with both stages.

The software and hardware settings are attached.
For synchronizing with the laser pulse we use following frequency generator settings:
period: 200us
high: 5V
low: 0V
duty: 50% 

The frequency generator is triggered with the external Q-switch trigger signal, that is in coincidence with the ESR HF.
To use the stabilization one has to use the external and NOT the q-switch mode of the laser. 
Entry  Tue May 10 20:35:42 2022, Phillip, Wilfried, Max, Detectors, PMT Threshold 
Since we have ions in the ring now, we looked at the PMT thresholds and the widths. In order to do so we looked at the Raw Signal directly before the CFD and its output simultaneously. You can now set the threshold just above the noise. If the threshold is too low you will also see flat lines in the oscilloscope when triggered on the CFD output. New values:

PMT Mitte
---
Width: 200 -> 220 (60ns -> 90ns)
Threshold: 20 -> 5

PMT Nord
---
Width: 200 -> 220 (60ns -> 90ns)
Threshold: 12 -> 10

PMT Süd
---
blind.
Entry  Tue May 10 21:41:17 2022, Rodolfo, Accelerator, T-Scraper 
The T-Scrapers at the electron cooler have an issue. They can't be moved in the horizontal direction using the DeviceControl.
Entry  Tue May 10 22:29:45 2022, Jan Glorius, DAQ, DAQ2 shaper settings setting_e128.v1
Attached are the MSCF shaper settings applied on Tue May 10 at 22:30.
Entry  Tue May 10 22:37:10 2022, Jan Glorius, DAQ, DAQ2 cabling docu e128_daq2_cabling.ods
 
Entry  Tue May 10 23:10:25 2022, Sebastian, Patrick, Volker, Guy, Accelerator, T-Scraper Reloaded 
We have established a Control to "manually" move the T-Scrapers via a "remote desktop". We can now move both scrapers in the horizontal direction too.

We are now T-scraping the ion beam for determining its position in the vertical and horizontal directions.
Entry  Tue May 10 23:53:42 2022, Rodolfo, General, shift change 
The night shift took over. They are trying now to overlap the ion and laser beams.
Entry  Wed May 11 01:09:07 2022, Patrick, Sebastian, Volker, Guy, Laser, Beam overlap 2022-05-11_final_laser_spot.PNG2022-05-11_final_MRC_settings_2.PNG
We overlapped the laser with the ion beam.

The ion beam positions are:
devicemove in dir.scratch (mm)gone (mm)gone + 4.5 (mm)x0 (mm)
GECEDS1VUup -3.0 -2.71.8
GECEDS1HAright -21.9 -20.9 -16.4 -4.7
left -12.0 -13.1
GECEDS2VUup -3.8 -2.91.6
GECEDS2HAright -19.2 -18.4 -13.9in [-0.1, 4.3]
left -9.0 -9.7

We used the "gone + 4.5" column where the scraper is in the middle of the ion beam to adjust the laser.

Picture 1: Final beam position.
Picture 2: Final MRC settings.

Note 1: By switching to the "real" bunching frequency, the laser went out of the stabilization. We restarted the MRC system and shifted the laser back into position with the piezo mirror, looking at the first screen (without amplifiers!).
After enabling everything again, the before found settings did not correspond to the correct beam position anymore, so we overlapped again.

Note 2: After the repositioning, the horizontal screw was at its limit and the beam stabilization failed. We moved the screw away from the limit while still hitting the screen and restarted the MRC system. The laser could then be stabilized again.
Entry  Wed May 11 03:10:55 2022, Patrick, Sebastian, Volker, Guy , Laser, Laser - bunch timing 2022-05-06_Bi2023_laserscan_test.png
We added the delay and gate generator in between the bunch trigger and the CFD to move the timing of the PMT middle signal relative to the photodiodes north and south.
The center value of PD-North is at 19 bins, PD-South at 55 bins, the middle is therefore at 37 bins. The PMT peak should be half a revolution, ie 75 bins further in the histogram, giving a peak position of 112, from which then 3 bins are subtracted to account for the distance of the PMT-middle from the center of the straight section. So all in all the delay is adjusted so the PMT-middle peak appears at 109 bins (see attached plot).
Entry  Wed May 11 06:41:32 2022, Simon, Christopher, Shahab, Runs, shifts 
new shift started.
Entry  Wed May 11 06:47:58 2022, Simon, Christopher, Shahab, Runs, restart laser scan 

Time SIS-intensity ESR-intensity after orbit change cooler-HV LMD-DAQ2 file nr LMD-DAQ1 file nr scan range(nm) step width increment (nm) dwell time(s) comments
06:37 7.8e7 ? 223217 392-395 8080 601.95 - 601.735 0.005 5s 8 loops
07:10 4.8e7 ? 223217 396-399 8081 601.95 - 601.735 0.005 5s 8 loops
07:48 1.3E8 ? 223219 400-403 8082 601.95 - 601.735 0.005 5s 8 loops
08:25 3.9E7 ? 223219 404- 406 8083 601.95 - 601.735 0.005 5s 8 loops
08:59 5.8E7 ? 223219 407 8084 601.95 - 601.735 0.005 5s 8 loops
09:38 7.2E7 3.1E6 223219 408-411 8085 601.95 - 601.735 0.005 5s 8 loops
10:24 6.4E7 3.1E6 223219 412-415 8086 601.95 - 601.735 0.005 5s 8 loops
11:05 7E7 2.2E6 223219 416-418 8087 601.95 - 601.735 0.005 5s 8 loops
11:36 6E7 2.2E6 223219 419-420 8088 601.95 - 601.735 0.005 5s number of loops now 4
11:56 2E8 6.9E6 223219 421-423 8089 601.62 - 601.405 0.005 5s 4 loops, changed scan range
12:28 1.1E8 5E6 223219 424-426 8090 601.62 - 601.405 0.005 5s 4 loops
12:43 6.5E7 2.6E6 223219 427-429 8091 601.62 - 601.405 0.005 5s 4 loops
13:11 1.3E8 5.8E6 223219 430-432 8092 601.62 - 601.405 0.005 5s 4 loops
Entry  Wed May 11 07:28:39 2022, Simon, Christopher, Shahab, General, DAQ Loop for shifters 
Procedure:

- Scanning phase ends (on LabView wait until "Idle Status" blinks. it will show e.g. 8 loops and 44 scans)

- on DAQ2 (Carsten) and DAQ1 type (simultaneously):

sto ac

- on DAQ2 (Carsten) and DAQ1 type:


clo fi
exit


- on DAQ1 computer, stop GO4 and close it

- on DAQ2 (Carsten) and DAQ1 type:

resl
mbs
@startup


- on DAQ1 computer, start GO4

go4&


- request new injection (move the green slider to red, wait for machine to go further, then move it back to green)

ESR_EXP22_03_209Bi83_Laser_06May.C1.9_WAIT_FOR_MANIP_BY_OP

- in Lassie Monitor, remember the value of SIS-Trafo (GS09DT_ML) after injection, and put it later in the elog table

- wait until the ion beam is cooled (look at the Schottky monitor)

- on DAQ2 (Carsten) and DAQ1 type (simultaneously):

sta ac

- on LabView press on button

Start Scan

- Scanning phase starts.

- you can show the status (and also the current filename) by using the command

sh ac

- update elog with SIS Current, Filenames, and time


- restart from top
Entry  Wed May 11 03:17:14 2022, Patrick, Volker, Guy , Runs, Start laser scanning 
Runs of the night shift. The wavelength range is 601.95 - 601.735 nm.
We started the wavemeter python script on atppc023 located in Desktop/wavemeter_Bi.
We changed the wavelength range in go4 to the actual scan range.

Questions:
There are many other masses/isotopes/etc. visible in the Shottky spectrum. Is this wanted?
Are the vacuum gauges turned off?
Laser timing correct? +- 3 bins?

TimeSIS-intensitycooler-HVLMD-DAQ2 file nr LMD-DAQ1 file nr scan range(nm)step width(nm)dwell time(s)comments
03:30 ?e7 223218 373 8073 601.95 - 601.735 0.005 5s 2 loops
03:38 9.0e7 223218 374-377 8074 601.95 - 601.735 0.005 5s 8 loops from now on
04:15 8.4e7 223218 378 - 381 8075 601.95 - 601.735 0.005 5s
04:49 7.4e7 223217 382 - 385 8076 601.95 - 601.735 0.005 5s
05:23 6.4e7 223216 386 - 388 8078 601.95 - 601.735 0.005 5s 8077 was skipped due to some "server socket locked"-error
05:59 8.9e7 223218 389 - 391 8079 601.95 - 601.735 0.005 5s
    Reply  Wed May 11 08:01:44 2022, Zoran, Runs, Start laser scanning 

Quote:

Questions:
There are many other masses/isotopes/etc. visible in the Shottky spectrum. Is this wanted?
Are the vacuum gauges turned off?
Laser timing correct? +- 3 bins?


No, this is not wanted and yes, the machine is aware of the problem. The decision on Tuesday evening was to leave the ESR in that state in order to start the measurement and continue setting on Wednesday. Otherwise the night shift could not take place.

The additional isotopes are only a few percent and should contribute insignificantly to the background rate.
Entry  Wed May 11 14:48:31 2022, Konstantin, DAQ, Voltage range of the Keysight DMM changed from 10V to 1V VoltageRangeChanged.png
During the setup of the ion beam the voltage range of the Keysight DMM was changed from 10V to 1V. Additionally, the name of the high-voltage divider was adjusted (this changes only the filename of the file, which is stored at the local pc decpc003).
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