01:50

Right arm at 64.60 mm

Left arm IN at 36.54 mm

MBS working - hopefully

Target ~3E11

Injection ca. 3E7

horizontal beam position 8.75 mm

vertical beam position  -5mm

Changed electron cooler set point to 247.3 V

Read value 246.75 V

Collector current 4.3A

Histograms and statistics zero'd. Code reset

Rates OK. Temps OK.

NOTE. Between 23:45 and 12:45 the electron cooler was off? We called HKR and they turned it back on. Are we using the same cooler settings? Is the cooler still definitely working properly? Ask Claude in the morning

02:30

The target density started to oscillate between 2e+10 and 3.5e+10. However, the pump speed seems to be stable.

03:50

The oscillations seems to deepend between 1e+10 and 6e+10. Additionally the E1 pump slowed down to 815. As Nikos suggested during the tuning, I tried to lower the temperature from 41K to 40.8K.

04:00 - 04:30

No major change was observed, thus I increased the temperature to 42.2K in order to try to get the pump to the nominal rotation. After 10 minutes, the pump slowed down to 810 and the pressure in E1 reached 2.2e-1. Since increasing the temperature seemed to have a negative effect, I slowly decresed the temperature with steps of 0.2 K, until reaching 40K. At this point, the E1 pump returned to 819/820, the pressure of E1 lowered to 1.6e-1 and the target density seems to be more stable with a value of 2.8e+11.

05:00

The target density started decreasing to 1.5e+10 and the pump speed slowed to 815. I've tried to lower the temperature to 39.8K, but the target density started to decrease. Thus I've set the temperature to 40.2K. The pump speed raised to 818 but the target density remaind at 1e+11 level with oscillations between 8.5e+10 and 1.5e+11. After some minutes, it started slowly increasing towards the 2e+11 region. The E1 pumping speed is stable at 818 and the pressure of E1 is 2.02e-1.

05:10

Electron cooler off, restarted 10 minutes after by calling HKK.

05:30

Target density at 1.5e+11, however, the E1 raised to 2.3e-1 and the pump speed decreased to 810. Since going down seemed to solve it, I decreased the temperature to 39.6K. After 5 minutes the E1 lowered to 1.9e-1 and the pump speed is going up (currently at 814). The target density is at the same level of 1.5e+11.

06:00

Again the target density started to go down, as well the speed of the E1 pump and the E1 pressure reached 2.3e-1. I lowered the temperature to 39.2K: the target density raised to approximately 3.8e+11 (and keeps going up), the E1 pressure lowered to 1.9e-1 and the E1 pump speed started increasing from 810 to 815.

06:30

The target density starting going down again, the E1 started increasing to 2.3e-1 and the E1 pump speed decreased to 810. I lowered the temperature to 38.8K, the density raised to 3.5e+11, the E1 pressure lowered to 1.9e-1 and the pumping speed starting increasing.

07:56 Gleb has taken the beam to try settings for the 5+ charge state. As soon as the target is ready, the 1+ charge state will be given back.

Detectors have been moved out for safety

08:10
      Run 63
   
      DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats - attachment 3

      per FEE64 Rate spectra - attachment 4

      
09:55 
      Run 63 

      DSSSD bias & leakage current OK 

      FEE64 temperatures OK  

      ADC data item stats OK

      per FEE64 Rate spectra OK

10:30

Data rate appeared very high c. 2000 kB/s instead of the usual 200 kB/s.

Rate on first two ASICs of aida02 was high (~2 kHz) but rest of aida01-04 looked fine.

ASIC check load reduced rate back to normal levels. Data rate reduced back to 200 kB/sec.

New ADC offsets loaded into the CARME_Sort code

Aida03 appears to be down. Check load does not resolve issue. Moving detector arm does not resolve issue. No spike in leakage current observed. System checks appear OK.  Zeroing ADC data item statistics keeps aida03 at 606023857 items and does not zero.

Issue resolved by resetting the data links for aida03

13:20

DSSSD bias & leakage current OK

FEE64 temperatures OK

ADC data item stats OK

per FEE64 Rate spectra OK

21:30

Waiting for the target.

Beam has been running, we have been running without storage.

See attachment showing beam stripe on the detectors.

Run 63 continued

22.06 DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats - attachment 3

      per FEE64 Rate spectra - attachments 4-5
       aida16 producing HEC data, ASIC check load to clear


23.56 DSSSD bias & leakage current OK - attachment 6

      FEE64 temperatures OK - attachment 7

      ADC data item stats - attachment 8

      per FEE64 Rate spectra - attachments 9

       aida01-aida04 high ADC data item rates - left DSSSD motion cycle required to reset


03.28 DSSSD bias & leakage current OK - attachment 10

      FEE64 temperatures OK - attachment 11

      ADC data item stats - attachment 12

      per FEE64 Rate spectra - attachments 13

       aida01-aida04 high ADC data item rates - left DSSSD motion cycle required to reset


07.50 DSSSD bias & leakage current OK - attachment 14

      FEE64 temperatures OK - attachment 15

      ADC data item stats - attachment 16

      per FEE64 Rate spectra - attachments 17

       aida01-aida04 high ADC data item rates (see above) appears to have resolved itself or has been resolved (but not logged)

21:00

Claude has achieved optimal cooling parameters for the beam

No target and internal work inside the cave tomorrow is required

Run 63 going - beam only background

Right arm at 64.60 mm

Left arm IN at 36.54 mm

MBS fakemotion script running

High rates on top left dssd again. Cycle left servo motor two times resolved issue

Rates OK. Temps OK.

Target has been moved out and H2 switched off. Changed to He.

Nikos will repair nozzle tomorrow morning. Remote checks until then.

Beam optimization and target change

New run 61

Right arm at 64.60 mm

Left arm IN at 36.54 mm

MBS working - hopefully

Target 4E11

Injection ca. 3E7

horizontal beam position 8.75 mm

vertical beam position  -5mm

Changed electron cooler set point to 244.95 V

Read value 244.4 V

Collector current 4.31A

Histograms and statistics zero'd. Code reset

Rates OK. Temps OK.

10:24

We lost the beam for 5 minutes. No counting spike observed when we got it back.

1L10

We lost the beam again for 5 minutes, but no counting spike obsevered when we got it back.

11:50


      DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats - attachment 3

      per FEE64 Rate spectra - attachment 4
      
      Beam intensity - ~ 3.3E7 pps

      Target density - 5.14E11 atoms/cm2

12:00 - 12:40

Large fluctuations in the target pressure, going down to 1e-9. We increased the temperature a little but it did not solve the problem.

Increased pressure 0.5 K more. Seems more stable

13:09

FEEs on det 2 stopped working. Checkloaded. Fixed.

No beam.

05:36

Run started.

Conditions as before, except left servo now really in.

06:24

Run continues OK, file R60_9

Temps OK. Stats OK. Merger OK. Write to disk OK.

System wide checks as usual.

07:30


      DSSSD bias & leakage current OK - attachment 4

      FEE64 temperatures OK - attachment 5

      ADC data item stats - attachment 6

      per FEE64 Rate spectra - attachment 7
      
      Beam intensity - ~ 4.8E7 pps

      Target density - 7.25E11 atoms/cm2
      

9:20


      DSSSD bias & leakage current OK - attachment 8

      FEE64 temperatures OK - attachment 9

      ADC data item stats - attachment 10

      per FEE64 Rate spectra - attachment 11
      
      Beam intensity - ~ 4E7 pps

      Target density - 7E11 atoms/cm2
      

21:32

New run 59

Right arm at 64.60 mm

Left arm IN at 36.54 mm

MBS working - hopefully

Target 4.7E11

Injection ca. 4E7

horizontal beam position 8.75 mm

vertical beam position  -5mm

Changed electron cooler set point to 244.85 V

Read value 244.3 V

Collector current 4.31A

Histograms and statistics zero'd. Code reset

Rates OK. Temps OK.

22:44

Screenshots of the above

23:00

Detector 0 shows usual strong noise. Shook twice. Fixed it. Beam loss in correspondence with this event.

Beam mostly recovered a few minutes later.

23:28

Detector 0 shows noise. Shook twice with servo. No result. Shook with pneumatic. Fixed. Some beam instabilities again.

01:00

Temps OK. Rates OK.

Merger OK. Write to disk OK (file 59_13)

01:36

Detector 0 shows usual strong noise. Shook it. Fixed it.

01:46

Detector 0 shows noise. Shook twice with servo. No result. Shook with pneumatic. Fixed.

The noise increase is definitely correlated with spikes in YRT1DT1MK current reading. Unclear what the reading is.

02:36

Target density has been consistentyl above 1E12 recently, very unstable and trending forward. Increased Lakeshore setpoint by 0.5 K.

Density decreases to high 1E11, and appear significantly more stable. E1 pressure reading also decreasing to 1E-1 mbar.

Temps OK. Stats OK. Merger OK. Write to disk OK.

03:58

Temps OK. Stats OK. Merger OK. Write to disk OK.

Target still unstable and now a bit too low density. Trying to slowly lower the temperature in 0.1 K steps.

04:55

Temps OK. Stats OK. Merger OK. Write to disk OK.

Target around 6E11 atoms/cm2, with Lakeshore temperature at 30.8 K. Waiting for it to stabilise.

05:34

Detector 0 noisy. Shook. Fixed it.

Realised I had not moved the detector back at 01:46 after shaking it. Most of this run has been taken with detector 0 fully out, i.e. 18.86 mm.

Moving in and moving to a new run.

Ion beam energy is calculated using Beamcalc (https://web-docs.gsi.de/~lestinsk/beamcalc/electron.php)

Electron current is set to 4.3 mA and can be taken from Grafana

Alpha factor is 50

Ion energy is then adjusted using the cooler voltage

The cooler voltage inserted into BeamCalc is taken from the FC20 voltage divider. However an offset from the space charge correction is required!

This correction is determined experimentally by changing the electron current and finding the cooler voltage which maintains the optimum cooling of the beam.

Attachment 1 shows this plot for 15N1+ at  ~0.426 MeV/u

Attachment 2 shows this same plot in comparison with BeamCalc

To obtain the correct energy we need to subtract 2V from the voltage used in BeamCalc

An example is shown in attachment 3

Here to obtain an ion energy of 426.6 keV/u requires a cooler voltage of 246.7 V. But, due to the space charge correction this value should be 244.7 V.

The cooler voltage setpoint should therefore be chosen so that the FC20 voltage divider reads 244.7 V.

The setpoint needs to be ~0.55 V higher than the desired value i.e setpoint of 245.25 V to obtain the required 244.7 V (at least this beamtime it does)

15:30

Merger OK, Tape server OK

ADC data item statistics OK

FEE temperatures look OK

System checks OK

20:20

Merger OK, Tape server OK

ADC data item statistics OK

FEE temperatures look OK

System checks OK

13:53

      DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats - attachment 3

      per FEE64 Rate spectra - attachment 4
      
      Beam intensity - ~ 5.0E7 pps

      Target density - off

08:26: There is no beam and Gleb is informed.

08:46: Beam is back.

06:45 New data file G22-201/R57

      Right arm at 64.60 mm

      Left arm IN at 36.54 mm

      horizontal beam position 8.75 mm

      vertical beam position -5mm
   
      Changed electron cooler set point to 244.4 V

      Read value 243.851 V

      Collector current 4.31A


      DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats - attachment 3

      per FEE64 Rate spectra - attachment 4
      
      Beam intensity - ~ 5.7E7 pps

      Target density - 2.91E11 atoms/cm2

8:35


      DSSSD bias & leakage current OK - attachment 5

      FEE64 temperatures OK - attachment 6

      ADC data item stats - attachment 7

      per FEE64 Rate spectra - attachment 8
      
      Beam intensity - ~ 4.8E7 pps

      Target density - 2.86E11 atoms/cm2
      
      There is no beam since 8:26 and Gleb is informed. 08:46: Beam is back.

10:49


      DSSSD bias & leakage current OK - attachment 9

      FEE64 temperatures OK - attachment 10

      ADC data item stats - attachment 11

      per FEE64 Rate spectra - attachment 12
      
      Beam intensity - ~ 4.0E7 pps

      Target density - 3.66E11 atoms/cm2


13:18


      DSSSD bias & leakage current OK - attachment 13

      FEE64 temperatures OK - attachment 14

      ADC data item stats - attachment 15

      per FEE64 Rate spectra - attachment 16
      
      Beam intensity - ~ 5.0E7 pps

      Target density - 5.67E11 atoms/cm2
      



     

23:15 New run 56 with

      Right arm at 64.60 mm

      Left arm IN at 36.54 mm

      MBS working - hopefully

      Target 4E11

      Injection ca. 4E7

      horizontal beam position 8.75 mm

      vertical beam position  -5mm
   
      Changed electron cooler set point to 244.3 V

      Read value 243.757 V

      Collector current 4.31A

      Rates OK. Temps OK

00.30 DAQ continues file G22-201/R56_9

      DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats - attachment 3

      per FEE64 Rate spectra - attachment 4

      Merger etc - attachment 5

      DSSSD bias & leakage current log, CRYRING hall ambient temperature log - attachments 6-7

01.30 Photographs of current CRYRING controls - attachments 8-14


01.30 DAQ continues file G22-201/R56_14

      DSSSD bias & leakage current OK - attachment 15

      FEE64 temperatures OK - attachment 16

      ADC data item stats - attachment 17

      per FEE64 Rate spectra
       aida16 asics # 1 & # 2 HEC data - attachment 18
       aida16 ASIC load check x2 restores normal operation - attachment 19

      target 5e+11 stable, beam 4e+7 stable 

02.45 beam off - reported to HKR

      DAQ continues file G22-201/R56_16

03.00 beam back

      beam 4e+7 stable, target 5e+11 stable

      DSSSD bias & leakage current OK - attachment 20

      FEE64 temperatures OK - attachment 21

      ADC data item stats - attachment 22

      per FEE64 Rate spectra - attachment 23


04.20 DAQ continues file G22-201/R56_21

      DSSSD bias & leakage current OK - attachment 24

      FEE64 temperatures OK - attachment 25

      ADC data item stats - attachment 26

      per FEE64 Rate spectra - attachments 27

      Cycle L DSSSDs per https://elog.ph.ed.ac.uk/CARME/603


06.04 DAQ continues file G22-201/R56_21

      DSSSD bias & leakage current OK - attachment 28

      FEE64 temperatures OK - attachment 29

      ADC data item stats - attachment 30

      per FEE64 Rate spectra - attachments 31

      beam 4e+7 stable, target 4e+11 stable

14:45

New run 55 with:

Right arm at 64.60 mm

Left arm IN at 36.54 mm

MBS working - hopefully

Target 7E11

Injection ca. 5E7

horizontal beam position 8.75 mm

vertical beam position  -5mm

Changed electron cooler set point to 244.2 V

Read value 243.66 V

Collector current 4.31A

Rates OK. Temps OK.

15:00

Detector 0 was noisy. Shook arm. Fixed it.

16:15

Detector 0 was noisy. Shook arm. Fixed it.

There is no beam in CRYRING since 16:05.

16:25

The beam is back but it is still a bit unstable and the operators are still trying optimize it.

17:20

We just did standard detector/electronics checks. Everthing looks OK.

17:50

Take screenshots.

20:50

Detector 0 was noisy. Shook arm. Fixed it.

But now detector 2 seems to have lost the Rutherford peak.

Screenshots taken and attached.

21:05

We did "Check ASIC Control" following Carlo's advise. This fixed the detector 2, but the detector 0 got noisy again. Another movement of the detector fixed the noise again.

22:15

Detector 0 was noisy. Shook arm. Fixed it.

23:05

This run has finished. The cooler voltage will be increased by 0.1V for the next run.

The latest spectra and detector/DAQ status are in the attachment.

Target density this morning had stabalised at 7e11 at/cm2

This is sufficient to test the beam/target overlap using the lifetime of the beam in the ring.

Previous attempt at this method was done at 1.5e11 at/cm2 where lifetime from residual gas and target are essentially the same.

Beam set to bunched. Beam position varied by 1mm and the number of particles in the ring taken from Grafana plots. Particles at injection compared with at dump.

Significantly more beam loss at > 8 mm beam position with highest value at 8.75 mm. This is the maximum we can move the beam.

Test repeated with no target. Same beam loss rate for all positions. We see a clear difference with the target only at positions > 8mm.

Test repeated with original electron cooler voltage Gleb tuned with last night. Same outcome -> cooler voltage has no significant impact on overlap (for 0.1V at least)

Overlap using count rate over 7.5 minutes also tested. DSSD 1 (top right) used as gauge as no beam stripe is seen in this detector. 

At horizontal position 4 mm (previous estimation of overlap) we saw a small increase in counts around 4.7 MeV with the target off compared to target on (76 vs 57)

At horizontal position 8.75 mm we saw a large decrease in counts around 4.7 MeV with target off compared to target on (95 vs 290)

It appears clear the overlap is at 8.75 mm. Future runs will use this as horizontal beam position.

09:30

New run 54 with:

Electron cooler setpoint 244.1 V

Electron cooler read 243.55 V

Collector current 4.3 uA

Right arm at 64.60 mm

Left arm IN at 36.54 mm

MBS working - hopefully

Target 7E11

Injection ca. 5E7

horizontal beam position changed to 8.75 mm

vertical beam position still -5mm

10:30

No beam

ADC stats increased to 250k again same time as beam lost

Detector shake resolved problem

System checks OK

10:35

Beam back

12:17

All system checks OK

12:29

DSSD top left noisy again. Detector shake resolves issuie

14:02

Running smoothly. Temps OK. Stats OK, but write to disk rate x10 usual for unclear reasons.

Target mostly stable. Beam OK, missing some injections occasionally.

14:25

Detector 0 noisy. Shook. Fixed it.

New run 52 with:

Electron cooler setpoint 244.2 V

Electron cooler read 243.66 V

Collector current 4.3 uA

Right arm at 64.60 mm

Left arm IN at 36.54 mm

Target 2E11 fluctuating

Injection ca. 5E7

22;00

Detectors moved out while HKR plays with the beam injection to improve its stability

22;56

All system checks good. Detectors still out. Stats in attachment 1

23:08

HKR still has to call, but I have put detectors back in since they are only operating on injection.

Noticed that from time to time the target density still sparks to E12, and this corresponds to when the temperature drops.

23:42

HKR called back, they found the problem and fixed it. Beam seems more stable, with injections at ca. 5E7

23:50

DSSD0 high stats, cycled the motors to clear them.

00:18

All system checks are fine. Attachment 2-3 with stats and a spectrum

00:38

Spikes in the target got more frequent. Increased temperature to 30.5K and monitor if it helps stabilizing it.

01:52

All checks OK. Target behaving, density 5-8E11.

Attachments 4-5

03:10

System checks OK.

Target consistent

Some beam outages which were quickly fixed by HKR

05:03

System checks OK.

Target consistent

07:00

Lost beam. Detectors moved out

Will likely end run once beam is back and change energy. Do not use data past 7 am

All system checks OK

Interactive Motion Program [workspace 6, display 2]

c                         stop current command(s)
l s by -20 mm             confirm y at prompt
l s by 20 mm              confirm y at prompt
read FakeMotion.dat       confirm y at prompt