MBS

Go4

RFIO & ESR-NAS

      	enum{TRIG_INJECTION=1, 
	    TRIG_NEWRAMP=2, 
	    TRIG_NEWVOLTAGE=3, 
	    TRIG_VOLTAGE_SUB1=4,
	    TRIG_VOLTAGE_SUB2=5,
	    TRIG_VOLTAGE_SUB3=6,
	    TRIG_VOLTAGE_SUB4=7,
//	    TRIG_VOLTAGE_SUB5=8,
//	    TRIG_VOLTAGE_SUB6=9,
//	    TRIG_VOLTAGE_SUB7=10,	    
	    TRIG_ENDOFRAMP=8, //presently 20 Hz MVLC
	};

        double  f_ParticleDetSA_sc; // 1: Particle Counter SA -*
        double  f_ParticleDetNA_sc; // 2: Particle Counter NA -*
		double  f_ParticleDetNI_sc; // 3: Particle Counter NI -*
		double  f_Injection_sc; // 4: Injection in Scaler -*
		double  f_NewRamp_sc; // 5: New Ramp in Sc -*
		double  f_NewStep_sc; // 6: New Step in Sc -*
		double  f_ICur_sc; // 7: Ion Current in Sc -*
		double  f_tm_sc; // 8: 1MHz  -*
		double  f_dummy09_sc; // 9: 
		double  f_HVDivider_sc; // 10: HV drifttubes, measured with divider -*
		double  f_dummy11_sc; // 11:
		double  f_ECurrent_sc; // 12: Electron Current Cooler -*
		double  f_CoolHV_sc;// 13: Voltage of Electron Cooler -*
		double  f_dummy14_sc; // 14:
		double  f_dummy15_sc; // 15: 
		double  f_tm100Hz_sc;// 16: 100 Hz from MVLC IO
        double  f_dummy17_sc; // 17:
        double  f_dummy18_sc; // 18:
        double  f_dummy19_sc; // 26:
        double  f_dummy20_sc; // 27:
        double  f_dummy21_sc; // 28:
        double  f_dummy22_sc; // 29:
        double  f_dummy23_sc; // 30:
        double  f_dummy24_sc; // 31:
        double  f_sub1_sc; // 25: Subtrigger 1 sc 
        double  f_sub2_sc; // 26: Subtrigger 2 sc 
        double  f_sub3_sc; // 27: Subtrigger 3 sc 
        double  f_sub4_sc; // 28: Subtrigger 4 sc 
        double  f_sub5_sc; // 29: Subtrigger 5 sc 
        double  f_sub6_sc; // 30: Subtrigger 6 sc 
        double  f_sub7_sc; // 31: Subtrigger 7 sc
        double  f_dummy32_sc; // 32:

• main control (big Philips monitor): sadpc058.gsi.de - 140.181.98.68
  
• NUC in ESR (DAC and HV divider ADC) : sadpc.gsi.de - 140.181.80.66
  
• Digilent scope in ESR (requires Digilent software installed, no user required): atpdev015.gsi.de - 140.181.82.76
  
• Seuencer NUC in Messhuette : NN - 140.181.92.75
  

• enters at the Nord-Ost (NO) Arc and
  
• leaves at the Süd-Ost (SO) Arc.
  

[1] New Ramp (NR) / Meas Gate
[2] New Step (NS)
[3] End of Ramp (ER) / COOL
[4] to ESR: Start Measure Trigger
[5] to ESR: Laser Trigger (~ 30 Hz)
[6] MEAS0
[7] MEAS1
[8] VFC

[11] to DR side: Laser Trigger (TTL) => to do => done
[12] from DR side Injection; signal comes from DR DAQ!!! => to do
[13] Meas Gate
[14] VFC
[15] to DR side: Part Det South (Cooler) => to do
[16] to DR side: Part Det North (Gas jet) => to do
[25] COOL
[26] MEAS0
[27] MEAS1
[28] New Step (NS)
[29] SubTrig 1
[30] SubTrig 2
[31] SubTrig 3
[32] SubTrig 4

[1] COOL => SC Ch9
[2] MEAS0 => SC Ch10
[3] MEAS1
[4] New Step (NS)
[5] SubTrig 1
[6] SubTrig 2
[7] SubTrig 3
[8] SubTrig 4 =Sc Ch16

setup Schottky TV:

connect to atppc030 using:

xfreerdp /u:atplaser /v:atppc030.gsi.de /w:1920 /h:1060

PW: given at label@LXG1297

this can be done also from the TCL computers

inside you open OBS Studio

then choose Video-Capture Device and both USB3 devices.

We think the beam in the ESR is not bunched. There is a clear difference in PMT signal if ions are in the ESR compared to no ions (see screenshot of scaler PMT mid, high level with ions, low level without) but we see no structure of an ion bunch (see screenshot of accumulated bins). 
We also increased the accumulation to 10 injections, still no bunch visible.
We double checked the frequency value of the HF cavity mentioned in the last ELOG entrance. 

In contrast to PMT Mid, the difference between ions and no ions in the ESR (see screenshot scaler) is not visible. Signal gets higher with injection and shows some kind of exponential decay afterwards. 
Beam was dumped at 500 and 1200s. Even after the dump, the signal steadily drops.
We tried to adjust the threshold such that a difference between ions in the ring and not becomes visible, but even with a minimal threshold no effect was visible.

As the beam in the ESR is most probably not bunched, there was not much we could do. During the night shift we:
- adjusted the threshold of the PMTs mid and north with beam in the ring
- found that the delay generator for PMT mid is broken, so the timing is off and needs to be remeasured
- tried to see the beam with PMT north, but with no success. Maybe with bunched beam this will be possible.

We turned off the PMTs, stopped mbs and the ESR pattern, notified HKR and left at 5am.


===> 10.05.12:30 (Carsten)
I checked the bunching in the HKR - the beam is bunche - see attached Foto from scope in HKR.
The blue line shows (the "zig-zag") that the ion beam is very well bunched, and that bunching frequency and cooling energy are "well matched".

I tried scraping with pressurized-air devices in order to verify the beam poistion. All 4 devices that we use do not work reliable (at least when driven "manually" via Device Control).
1) Sometimes they do not reach the set position
2) Sometimes they overshoot the set position but "oscillate" back to finally reach the set value. EVEN with small step like 5mm the drive moves then 15m in and 10 mm back (or even further?)
3) It seems (but difficult to verify to due 2) that position calibration is quite off.

In particular the latter behaviour makes it very difficult to locate the ion beam.  It seems to be possible to set up the particle detector for the primary beam but will make it very difficult if not impossible to set up 208Bi with the secondary beam.

The following value for "scraping" are thus to be taken with a grain of caution.
GE02DD2_G (Part Det behind cooler): beam is destroyd at -25 (at -30 ?)
GE02DS3HG (Scaper in south arc): beam is destrod at -4 
GE01DD1AG (Capture North arc): beam is destroyed at about -30 
GE01DD2IG (Ion North arc): even at "endlage innen" ion beam cannot be touched.

For further tests I try the following automated settings:

IN in in SC7, BP3
GE02DD2_G, GE02DS3HG, GE01DD1AG : -45
GE01DD2IG : 20

OUT in in SC10
GE02DD2_G, GE02DS3HG, GE01DD1AG : -120 
GE01DD2IG : 120
(not fully out)

The cooling ith a tentative DRALS pattern works well. 
Cooling voltage in SC8 is now 905 V higher:
ESR manipulations -> Cooler maniuplations -> GECEBG1E is changed from +150V to +1055V. Please note the sign conventions. This means that the electrons are now 905V faster.
This is compensated by a DRALS pattern of -900 V (COOL) / 3300V (MEAS0/MEAS1). The -900V at the drifttubes decelerates the electrons.

The voltage is verified via the bunching pattern in the scope. The bunching signals look best in a flattop of about +1050V to 1060V. 1050V is the design value (1050V -900V = 150V).

• ssh esr_cooler@140.181.95.195
  
• screen -r cooler_signals (Note: If this command ends with an error message, use "-R" instead of "-r". In this case the readout was not running and must be restarted (see below). Otherwise you should see something similar to the attachment. As long as warnings are printed everything works fine The program can be stopped by typing "stop" and pressing return.)
  
• (*) cd Documents/electroncoolerelectricalsignals/
  
• (*) conda activate cooler_signals
  
• (*) python main.py -f <file name> -i <interval> (argument filename is the name of the log file and interval is the sending interval of the HV-divider)
  

At ~17:26:30 the beam process was accidentally set to not wait on breeding, affecting the data in file 0012.LMD

We have 4 valid DR files for DR with unbunched beam. Iel = 500mA
run_0011.lmd
run_0012.lmd
run_0014.lmd
run_0015.lmd
corresponding ADC data for the DT voltages are available (ESR NUC).

NTCAP is stopped at ~22:30
(Plan: go back to bunched beam)

Below is a first offline analysis of the DR data of and of the intermediate cooling step (-900V) of unbunched beam.
The DR spectrum goes from Ecm = 24eV (channel 1) to 4 eV at channel (channel 1001)  with a stepwidth of 0.02 eV per channel (equidistant in the CM-frame). Thus 100 channels are 2 eV.
The other spectrum shows the intermediate cooling rate after each measurement step. 
The maximum of he peak is at about channel 520, i.e 24 eV - 5.2*2eV = 13.6 eV (expected ~17.8 eV). The peak is very broad. FWHM about 100 channels (2 eV). For comparison, the old data from 1998 had FWHM ~0.6 eV but limited due to density of the resonances - not experimental resolution.

The rising slope is the real RR (radiative recombination at non-zero energies) slope. There is no background from residual gas (verified in the bunching spectrum).
The intermediate cooling rate is about 2.5 to 3 times the rates in the DR spectrum. Expected was AT LEAST a factor 10 but rather a factor of 100 (one hundred). This finding is inline with the long beam lifetimes and the moderate breading efficiency.

Comment: In the analysis, I carefully checked all relevant raw-data spectra, in particular the timing pattern and the measured voltages. The raw data look extremely good (from a technical point-of-view)and agree with the settings. 
=> The new setup works very well.

At about 22:30 we switched back to the bunched beam.
The new NTCAP directory is IQ_2025-05-11_22-37-04, started NTCAP Schottky data.
Same ramp as before 24 eV to 4 eV. 1001 steps dE = 0.02 eV,
Measurement step 40 ms / cooling step 40 ms.
The ramp is repeated 15 times.
I_el = 500 mA.
Opened file run_0016.lmd
Jonas checked that the bunching works using the scope in the main control room. 

The DR peak appears after very few scans.

During this night we recorded several DR measurements. Before the DR, we charged bread for about 10 minutes.

1. We took over at 0:00 with file no.16 (started 22:15) 
2. Started new file (no.17) at 4:34
3. Recorded file no.18 starting at 6:30

We stopped the measurement at 7:28 and started the shut down procedure.

At 11am there will be an intervention for about one hour related to the TK chopper - hence no beam for SIS as well as ESR.
During that time, the pneumatic drives within ESR will be mechanically checked (lubricated).

The ESR-colleagues re-checked the charge states in the ring. 

FA-2 frequency counter

Stronger spectra than before, probably due to a stronger overlap with the electron beam.
Open files starting with run_0022, finished with 0025, each one about 6 min charge breeding and 11 min ramp
ntcap stopped, electron current 500 mA, DC beam

ntcap restarted (05-12_22-22-23), measuring with bunched beam
10 min breeding time

See attachment - electron current 500 mA.
First spectrum DC,
Second spectrum bunched.
Resolution is slightly worse for bunched beam but not dramatically.
Please note, that the ratio DR/RR is 1:1. 
Spectra are about 4-5 injection cycles each. (and due to the shorter lifetime with 8 scans instead of 15 scans).
ion beam intensity : about 2e7 Li-like
Other settings as before.

-> Resonance is now at the correct energy!

• 500mA cooler current, file 25-26 (CR DAQ), NTCAP folder closed
  

  Ohmlabs	205854
  PTB 3.2	205861
  PTB 3.3	205862

  
  
  
• 250mA cooler current, file no.27 (CR DAQ), NTCAP folder "IQ_2025-05-13_00-18-48"
  

  Ohmlabs	205812
  PTB 3.2	205819
  PTB 3.3	205819

  
  

Connection reset to all NUCs by accident manual power cut.

In the morning the colleagues from ESR setup the beam for production of 208Bi81+, however the identification (via the schottky) of the correct fragments and charge states is still ongoing.

Issue with the pneumatic drives (scraper/detector) is still not solved yet, however we want to give it a try with the current limitations unless it becomes absolutely necessary.

Setting on 208Bi81+
Manipulation after accumulation and orbit shift, before slowing down

f(MHz) - A/Q <<< comment
243.031 - 209/80 <<< primary beam charge state
<<< missing @243.068 - 201/77 
<<< missing @243.111 - 206/79 
243.191 - 203/78
243.231 - 208Bi80+ ******
243.274 - 200/77
243.314 - 205/79
<<< missing @243.360 - 197/76 <<< probably under the bump of uncooled beam <<< has been seen in another manipulation
<<< missing @243.396 - 202/78 <<< probably under the bump of uncooled beam <<< has been seen in another manipulation
<<< missing @243.431 - 207/80 <<< probably under the bump of uncooled beam <<< has been seen in another manipulation
<<< missing @243.482 - 199/77 <<< probably under the bump of uncooled beam
243.516 - 204/79 <<< a_pi=-0.17
243.549 - 209/81 <<< primary beam charge state
<<< missing @243.604- 201/78 
243.634 - 206/80 <<< a_pi=-0.168
243.694 - 198/77
243.721 - 203/79 <<< a_pi=-0.170
243.746 - 208Bi81+ ***** 
243.784 - 195/76
243.811 - 200/78 <<< a_pi=-0.172
243.836 - 205/80
243.879 - 192/75
243.904 - 197/77
243.926 - 202/79
243.946 - 207/81 << a_po=-0.170

Results so far for the DR scans @300mA e-cooler current.

Continuing with the measurements of the last shift, also at 300mA. Creating new file, as beam got killed during last run.

[TABLE border="1"]
Time |File | PTB 32 | PTB 33 | Ohmlabs | ESR intensity SC8 | Typical SIS injections | comments |-
8:42 | 42 | 205826 | 205827 | 205820 | 4e5 | 4e8 | opened new file |-
9:07 | 42 | 205826 | 205827 | 205820 | 4e5 | 4e8 |-|-
9:34 | 42 | 205826 | 205827 | 205820 | 3e5 | 4e8 |-|-
9:59 | 42 | 205826 | 205827 | 205820 | 0 | 4e8 | DS3HG went to  position 20.4, killing the beam |-
10:24 | 43 | 205826 | 205827 | 205820 | 3e5 | 4e8 | opened new file |-
10:51 | 43 | 205826 | 205827 | 205820 | 0 | 4e8 | Beam in the ESR got killed again. DS3HG is at normal position though, so we don't know why |-
11:17 | 44 | 205826 | 205827 | 205820 | 0 | 4e8 | opened new file, DS3HG killed the beam again |-
11:41 | 45 | 205826 | 205827 | 205820 | 2e5 | 4e8 | opened new file |-
12:07 | 45 | 205826 | 205827 | 205820 | 0 | 4e8 | DS3HG killed the beam by going too far for just a second and then going to normal position. Maybe that was the reason some previous beams got killed even though when we looked at the scraper it was in the normal position. Stopped measurements so Sergey can maybe fix the issue with the scraper. Slightly adjusting the setpoints of the scraper should fix the problem of it going too far. Last file got closed. |-
[/TABLE]

• Detectors are moved in in SC9 and out in SC12. Due to the 3 internal beam processes (BP1 to BP3) the old SC7 was not suited for that.
  
• The waiting machine for measurements is now SC10
  
• The ranp file has now a 5 seconds waiting at the beginning to compensate for the longer time between ramping down and scraping.
  
• As a byproduct the deceleration decomes more efficient.
  
• Since the detector north 02DD2AG seems to drivemore reliable than the scraper 02DS3HG we now use the detecotr north for scraping.
  
• Positions in SC9: 01DD2AG: -55 (destroys beam at ~-25); 01DD1AG: 26; 02DD2_G: -60, all out positions (SC12) are 120 (-120)
  
• Due to the higher number of beam processes, changes of electron current or the delta voltage have to be performed in both, SC8 and SC10.
  
• The first 10 channels or so in the DR spectra might show some weird behaviour - don't worry that is "by design" (aka due to the changes above).
  
• We now had 2e6 208Bi80+ for 8e8 SIS current (15 injections, 45 cycles breeding at 10s) - thre still seems to be some headroom.
  

• Concentration Resonator: 0.16 g/l
  
• Concentration Amplifier: 0,02 g/l
  

• Total measurement window: 600 001 ms (10 min + 1ms)
  
• COOL: 16800 us
  
• MEAS0 / MEAS1 : 16800us
  
• Ramp phase delay: 3000 us
  
• Voltage MEAS0 (MAX of F=4 Peak) : 3348V
  
• Voltage MEAS1 (MAX of F=4 Peak) : 3243V
  
• Voltage COOL: -900V
  

[1] 5500 us
[2] 2000 us
[3] 2200 us
[4] 2400 us
[5] 200 us (not connected)
[6] 200 us (not connected)
[7] 200 us (not connected)

The pump laser is broken!

To be more specific the YAG crystal looks cracked (see att.) and we don't have a spare one.
First thing tomorrow morning we will call InnoLas and ask if they can repair it before the weekend.
If not, Rodolfo will install the old Quanta Ray laser for the remaining beamtime.

Switched to bunching: Ring HF Bucket_fill(RF_manipulation)(SC7,BP2) changed from [3.0, 0.0] -> [3.0, 3.0]
Injections 5 | Breeding 30

DR scan and HV Calibration against Schottky frequency (NTCAP).
Since DR measurements are presently running with DC beam we can easily do a calibration of cooler voltage against Schottky frequency at the end of the DR scan.

When the DR scan is finished, the beam is dragged to the 900V too high cooler voltage.

In manipulation machine we change the cooler voltage in steps of 100 V and measure it. The according Schottky data of the single line are in the NTCAP directory: IQ_2025-05-15_23-46-52 (IQ_2025-05-16_00-26-37)
DR run file run0060.lmd 

We do 20 injections, and 75 times 10s cooling/breeding

In the end we measured the revolution frequency as a function of the correction in the electron cooler HV GECEBG1E (Delta Uacc) Paramodi folder ESR Manipulation


all values at I_el = 300mA
[TABLE border="1"] 
Voltage correction | PTB 3.2 / V | PTB 3.3 / V | Ohmlabs / V| Revolution frequency / MHz |-
 880 | 205826 | 205827 | 205820 | 1,940625 |-
 980 | 205926 | 205927 | 205919 |  |-
 880 | 205826 | 205827 | 205820 | 1,940625 |-
 780 | 205727 | 205927 | 205919 |  |-
 680 | 205626 | 205927 | 205919 |  |-
 580 | 205527 | 205927 | 205919 |  |-
 480 | 205427 | 205927 | 205919 |  |-
 380 | 205326 | 205927 | 205919 |  |-
 280 | 205226 | 205927 | 205919 |  |-
 180 | 205126 | 205927 | 205919 |  |-
 080 | 205026 | 205927 | 205919 |  |-
 -20 | 204926 | 205927 | 205919 |  |-
-120 | 204826 | 205927 | 205919 |

[/TABLE]

[TABLE border="1"] 
Voltage correction | PTB 3.2 / V | I_el / mA |-
-20 | 204910 | 200 |-
-20 | 204893 | 100 |-
-20 | 204909 | 200 |-
-20 | 204926 | 300 |-
-20 | 204942 | 400 |-
-20 | 204959 | 500 |-
-20 | 204926 | 300 

[/TABLE]

Move back to standard settings
Voltage correction = 880V | PTB 3.2 = 205826V | I_el = 300mA

1:27 NTCAP stop close file

1kHz read out trigger NTCAP

DC Trafo --> B1 SRC1
U Cooler --> B1 SRC3
I Cooler --> B1 SRC4
P Gun    --> B1 SRC5

After some minor adjustments for the laser done by Rodolfo, the laser is back 
at ESR and visible by the PD-SO.
We checked the timing between the cooling signal of the e-cooler and the 
signal produced of the PD-SO, which is suppose to be at the end of the 
cooling ramp - seems to work as expected. Picture is attached.

Note added (Carsten): The "cool" signal is generated by the microcontroller. It 
is only in sync if the laser signal is put on the input line to the microcontroller. 
Otherwise both have independent clocks.

The scan range according to Wilfried should be

593.15 nm - 592.55 nm

with the resonance at 592.85 nm

We adjusted the delay of the laser according to the signal of the PD and the PMTs.

• Oscillation in bunched beam operation (maybe due to RF and cooler voltage offset?)
  
• While in coasting beam mode a steady state is reached, this is not observed in bunched beam operation.
  

• ECEDS1VU: Verriegelt mit ECEDS1HA. Der Antrieb kann nur fahren
  wenn der Antrieb ECEDS1HA in Position -4,0 steht.
  
  
• ECEDS1HA: Verriegelt mit ECEDS1VU. Der Antrieb kann nur fahren
  wenn der Antrieb ECEDS1VU in Stellung EI steht.
  
  
• ECEDS2VU: Verriegelt mit ECEDS2HA. Der Antrieb kann nur fahren
  wenn der Antrieb ECEDS2HA in Position 0,0 steht.
  
  
• ECEDS2HA: Verriegelt mit ECEDS2VU. Der Antrieb kann nur fahren
  wenn der Antrieb ECEDS2VU in Stellung EI steht.
  

The common stop was wired through a 1:2, and subsequently through a 1:99 rate divider channel. However, since the pulse width was too long, the 1:2 channel was translated into a 1:4 reduction. This must be considered, when the data is processed via go4. The reduction factor in the SetParameters.C file must be set to 198 accordingly.