| ID |
Date |
Author |
Category |
Subject |
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41
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Thu Mar 31 13:28:17 2022 |
Jan Glorius | DAQ | DAQ-2 cabling docu |
newest version V2 - valid since Mo 04.April 2022 |
| Attachment 1: e142_daq2_cabling.pdf
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| Attachment 2: e142_daq2_cabling_V2.pdf
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| Attachment 3: e142_daq2_cabling_V2.ods
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42
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Thu Mar 31 15:53:50 2022 |
Konstantin | Detectors | Control software for XUV and copper mirror detector |
> Attached you find a manual for the software used to control the movement of the XUV detector and the copper mirror detector.
> The software is also used to set the electrode voltages and coil currents of the XUV detector.
We tested the remote access to the raspberry pi as explained in the manual attached to the original entry of Volker. It was tested from
the linux machine LXG1050. Attached you can find a screenshot of the running program. |
| Attachment 1: XUV_Cu_GUI.png
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43
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Thu Mar 31 17:56:32 2022 |
Konstantin | DAQ | Photodiode test signal |
| We used a signal generator to provide a 4MHz dummy-RF signal. This was divided by a factor of 2 for laser-"bunch" synchronization and by a factor of 200 for to provide the stop-tigger attached to the DAQ. With this Dummy-RF we were able to measure the relative arrival times of the laser at the photodiodes located in the laser towers. Note that the signal of the southern photodiode arrives first. This is because the scale of the time axis is given in (10/3ns)-bins since the last common-stop. |
| Attachment 1: Timing_Photodiodes.png
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44
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Thu Mar 31 20:07:47 2022 |
Shahab | DAQ | Schottky Display in AP Messhütte (or anywhere else) |
UPDATE: 16.05.2022
Please use ATPPC029 instead of ATPPC019 for the 245 MHz Schottky
Alternatively you can use ATPPC030 for viewing the 410 Schottky
we let this setting go for a while, in case of problems we go back to the settings below.
Bests
Shahab
----------------------------------------------------------------------------
Schottky can be displayed using GSI's standard remote desktop connection from any standard GSI computer that is connected or registered with GSI's
cable network.
On windows choose --> remote desktop connection
On Linux choose --> KRDC or from command line prompt you cab also use XFREERDP)
On Apple choose --> Microsoft Remote Desktop
then connect using experiment account using RDP protocol:
atlaser@atppc019.gsi.de
enter password
on desktop there is an icon called "SignalVu Schottky"
On the menu --> Instrument --> Connect --> USB device
245 MHz resonator: RSA607A::B021694
410 MHz resonator: RSA607A::B021705
by default you can use the 245 MHz resonator.
default setting is set to 244 MHz and span 20 MHz, if there is a beam in ESR you will see it.
have fun!
https://apps.apple.com/us/app/microsoft-remote-desktop/id1295203466?mt=12
if you like to use xfreerdp, here is the syntax:
xfreerdp -g 2560x1420 -u atplaser atppc019.campus.gsi.de |
| Attachment 1: 04_PM_schottky.png
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45
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Thu Mar 31 22:19:14 2022 |
Kristian | DAQ | How To Start MBS |
(MBS server should be running at the LXG1297 machine. If not you will get an error message. Then start the server - last command in console)
Just enter the following commands in the console of any PC
ssh atplaser@r4l-41
ThE142_2022
resl
cd mbsrun/th22
mbs
@startup
connect rfio lxg1297 -disk
open file lxg1297:/data.local2/BeamTimeTh22/229Thor -auto -rfio
sta ac
To stop MBS enter the following commands
sto ac
close file
disconnect rfio
@shutdown
exit
resl |
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46
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Thu Mar 31 22:41:35 2022 |
Kristian | Calibration | HV divider |
We noticed a difference in the electron cooler high voltage:
The set voltage is ~205 kV, the Ohmlabs divider measures 207 kV and the PTB200 shows a value of ~212 kV. The latter is doing some crazy jumps of up to 10 kV, see screenshot. The Ohmlabs divider is stable
Maybe some small discharges? |
| Attachment 1: HV-divider2.png
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47
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Fri Apr 1 00:27:27 2022 |
Carsten | | Settings Particle Detectors /Tests with primary beam |
All the beam settings will be given in a separate post.
We have 238U92+ centered in the ring with typically a few times 10⁷ ions.
SA_SZ (GE02DD2_G): Voltage 1200 V, Recomnied peak was scraped at about -50 mm, set the detector position to -25 mm
We see very clean signals with amplitude 1,5V (Foto will follow). Threshhold: CFD "25" arb. units. count rate 8kHz - 10 kHz
Rise time 6ns (with all the cables).
NA_SZ (GE01DD2AG): No signals - cables in the ESR need to be checked
NI_SZ (GE01DD2IG): Can not be positioned, error from Control system: "Auftr. Stattus position set value out of range", Drive can however be positioned to the "Endlage innen" and "Endlage außen".
The Test above were with a DC beam. With a bunched beam we more rapidly loose the ions with the particle detector. |
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49
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Fri Apr 1 01:57:12 2022 |
Kristian | DAQ | Timing |
with bunched primary beam (bunching frequency 1.94070 MHz) we have strong PMT (mid) and particle detector signal. Time between both detectors was measured (in 3.3ns bins)
Particle Det ; PMT (rising edge)
305 ; 256
227 ; 179
150 ; 102
73 ; 24
PD and PMT signal is second plot. Laser timing was not adjusted jet since it will change with Th beam. |
| Attachment 1: Particle-PMT_Mid.png
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| Attachment 2: PMT-PD.png
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| Attachment 3: IMG_20220331_235846.jpg
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50
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Fri Apr 1 02:29:40 2022 |
Carsten | | ESR Cooler crashed |
ESR cooler crashed. We could not restart the cooler. Since we had several other problems, we stop now. |
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51
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Fri Apr 1 11:00:41 2022 |
Rui-Jiu Chen | DAQ | Start NTCAP |
Start taking data with NTCAP.
Carrier Frequency: 245MHz
IQ rate:5 MSamples/s
Reference level -0 dBm.
RF - Attenuation:40 dB
IF attenuation: 19.9288 dB
Date Files:
Samples/Record:2^18=262144
Records/File:2^12=4096
Masterpath: p:\E142\iq\IQ_2022-03-30_09-39-26
p:\E142\sc\SC_2022-03-30_09-39-26
Free space: o diver: 34.9TB. p driver: 34.8TB. |
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52
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Fri Apr 1 11:19:57 2022 |
Rui-Jiu Chen | DAQ | S.M.A.R.T check on NTCAP |
S.M.A.R.T. check has been done on NTCAP on March 28th. All 12 hard disk drivers are normal. |
| Attachment 1: image001(04-01-11-10-06).jpg
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.jpg.png "image001(04-01-11-10-06).jpg")
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53
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Fri Apr 1 15:27:00 2022 |
Rodolfo | Detectors | Nitrogen for UV-PMTs |
There was a question concerning the nitrogen we use to rinse the "Solar Blind PMTs".
- I have checked the nitrogen flow rate this afternoon (14:00) and it was a level of 0.2 LPM.
- I have increased this now to 0.4 LPM.
In the pictures below you can see where the "fine tunning" valves are located.
Bilder: R. Sánchez |
| Attachment 1: Stickstoff_f_PMTs.jpg
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| Attachment 2: Stickstoff_Flussrate.jpg
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54
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Fri Apr 1 15:52:23 2022 |
Rodolfo | Detectors | UV PMT South |
The "Solar Blind PMT" labeled as "PMT South" has been installed by Simon and Max in the gas target chamber on a CaF Viewport. The PMT is pointing directly to the center chamber.
- I have covered the support of the PMT and the flange with additional aluminum foil in order to try to reduce the straight light.
- I will check the signal of the PMT as soon as the lighting inside the cave will be turned off.
Bild: R. Sánchez |
| Attachment 1: PMT_Sued_Target.jpg
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55
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Fri Apr 1 16:46:33 2022 |
Carsten | Detectors | All pressuzied air drives are tested now and are working properly |
All pressuzied air drives are tested now and are working properly |
|
56
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Fri Apr 1 18:19:58 2022 |
Kristian | Calibration | HV divider |
We checked the strange behavior of the HV dividers again. The Ohmlabs and the PTB divider are in good agreement at 120 kV and 150 kV. There, both dividers deviated by 0.35% from the value on the HKR multimeter. Ohmlabs divider yields higher voltage.
At higher voltages (180 kV, 195 kV and 205 kV) the PTB divider showed jumps. The deviation between Ohmlabs divider and set value increased at higher voltages up to 2 %. Ohmlabs divider was fluctuating at 10 V scale but center was stable.
We removed the PTB divider.
Afterwards, the fluctuation of the Ohmlabs divider are at the 1 V level. Deviation between Ohmlabs divider and set value is now 0.35 % at 205 kV. Same as in the low voltage range with the well-working PTB divider. |
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57
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Fri Apr 1 18:30:38 2022 |
Carsten | Detectors | Positions / Voltages threshlds for particle detectors |
DC beam 238U92+ (205kV, e-beam)
We used the detector NA_SZ to determine the central primary-beam (238U92+) position by observing the Schottky-signal while moving the detector inside.
The beam position is 43 mm (wehre the beam is almost gone").
NA_SZ
In the pocket of the NA_SZ we mounted the thick "old pilot U" scintilator since the original one foreseen is defect, see other post.
CFD Model CAEN N853
800V position 20mm pulse height 1V
750V position 10mm pulse height 0.82V, CFD, Ch7, 247, (247mV according to manual)
SA_SZ
Check positions and voltages of the detector behind the cooler
Yesterday the setting of the scope was x10, so the values written in that post were wrong.
At present we position -20, 1400V, pulseheight 1C, CFD, Ch6, 250 (250mV according to manual)
Scraping from the inside with NI_SZ touches the primary ion beam at 28 and destroys the beam at 27 mm. Thus, the beam presently is on a very inner orbit. |
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58
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Fri Apr 1 22:01:14 2022 |
Konstantin | Detectors | PMT operating voltages |
> During the testing of the PMTs the following operating voltages were applied:
>
> PMT Cu: -1300V
> PMT Nord: -2500V
> PMT Mitte: -1800V
> PMT Süd: -1800V
>
> Further optimization will be necessary during background measurements.
Currently, PMT Süd shows a strange behavior resulting in after-pulses up to 1µs. Therefore, the high-voltage was reduced to -1500 V.
However, the after-pulses remain. This should be investigated in more detail at some other point. |
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59
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Fri Apr 1 23:12:37 2022 |
Patrick | Detectors | Scraper positions "only primary beam" |
Scraper positions where there is only primary beam for detector tests. Use only one outer and one inner scraper at the same time.
Move detectors out before new beam!
outer:
GE02DD2_G: 0mm
GE01DD2AG: -10mm
inner:
GE01DD2IG: 40mm |
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60
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Fri Apr 1 23:47:45 2022 |
Carsten | Detectors | PMT thresholds / PMT north does not allow voltage abow ~ -1kV |
Checked thresholds of PMT with beam and without beam.
The PMT "south" which is now at the gas-jet target has burst-like pulses with a train of many short pulses of duration of about 1us. The signals are taken out of the ADC of the 2nd DAQ (but are still in the VUPROM TDC).
The PMT "middle" (broad-band VUV) has a quite high count rate of about 4-kHz at a few 10e7;; ions in the ring. The rate is very low without ions in the ring but it does not fully scale to low intensities.
At low intensities of a few 10e5;; we still have more than 100 Hz.
For a PMT voltage of -1800V a threshold of 20mV was set which is ok an d we leave it
Note: We see a noise beat of 6ns and 55ns with amplitude of about 15mV to 20mV. The high frequency disappears if we use a battery scope.
PMT "north" small-band VUV
We tried to put the voltage to the wanted level of -2500V. It was not possible to set a voltage higher than about -1000V. WIth this voltage the PMT draw a current of about 200uA and at a voltage above this value it dropped to zero and switched off.
We need to have a closer look at the PMT in the ESR tomorrow with some specialist knowledge. |
|
Draft
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Sat Apr 2 01:02:39 2022 |
Carsten | | Test measurements with two DAQs |
We do two measurements:
One measurement using the |