07:00

After putting the target back, we observe strong periodic (5 s) fluctuations going from 3E11 to 5E12. The reason is unclear. One may warm up the target to solve this, but will ask Nikos later instead.

The target may be a bit too thick for our purposes, and the luminosity will vary greatly depending on injection vs. target fluctuations timing.

Rates OK. Temperatures OK. Merger OK.

System wide checks as before.

07:30

Moved detectors fully out to check elastic and signal rate in this configuration.

Half of DSSD BR was missing. Checkloaded. Solved.

Moved to run 48. Target still unstable.

08:23

Beam issues. Called HKR. Target out.

09:00

Still no beam. Increased target temperature to 29K from 28.5K. It seems the fluctuations disappeared.

Rates as before.

10:22

Beam might be back but people are checking the steerer. Target in. Started run 49. Detectors still out.

10:13

Some beam. HKR is still working on it.

Data rate up to 2 MB/s. Merger events merged matches. However Stats do not seem to have increased. This is the second time I observe this.

RUN 46- started at 00:50

Horizontal beam position = 4.0 mm, vertical beam position = -5.0 mm.

Detectors are Left arm OUT = 36.64, right arm IN =  64.60 mm

Injection at ca. 6E7

Target density 6-7E9

-----

00:51

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachments 1-2

01:19

Attachments 3-4 waveforms. DSSD0 stats fine

01:33

DSSD0 stats fine

Attachments 5-6 spectra and xy, but I am not sure at which time these are cause I am stupid and apparently the AIDAsort code was not running....

01:56

Restarted the AIDAsort code and noted that stats in DSSD0 were bad again. Another shake. This time no change to the beam on my side.

2:43

All checks fine. Attachments 7-10 (also spectra)

4:01

Notice stats on DSSD0 went bad again. Attachment 11. Gave detector a shake.

Now all system checks OK (Attachements 12-14)

4:19

Just noticed target is oscillating a bit, hitting 1E10. I moved it further in X and Y. Seems to not go below 6E9 in any case.

NOTE: target was on at x=-19899 y=500.

5:17

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachments 15-18 (also waves)

5:53

Notice stats on DSSD0 went bad again. Gave detector a shake.

6:10

Stats ok in attachment 19, but

Noticed DSSD3 has started to get only a fate of 140 nstead of previous 5500is (similar to what DSSD2 has done earlier- see previous elog). Attachment 20 for the rates.

I have therefore made the Check ASIC control test from the ASIC control tab- attachment 21 with results.

DSSD3 back to normal operations - attachment 22

Tried to double check beam-target overlap by changing beam horizontal coordinate.

In the tablethe counts in the 4000-5200 keV region in each of the detectors are recorded. Counts were taken for a total time of 5 minutes per beam position. Attached are the xy plots.

I think the tests are inconclusive given that the beam in the first three points were not ideal, with many low intensity injections. Moreover, changing the beam often ends up causing the stats in DSSD0 to rise significantly (consequentely needing to shake the detector to go back to normal operation).

After fixing DSSD2, statsin DSSD0 went up again. Stopped the test after shaking again the detector.

----

I have put back the beam at 4mm horizontal. I switched off the target by moving it to x=-10000--->x=-5000 (previosuly X=-19800). Denisity went down to 5E9. However, I decided under Jordan's suggestion to make another test and I put the target back to x=-19800: interestingly the density went up to 5E12 and start oscillating for a while between 5E12 and 5E11.

I did a 10 minute check of counts in the 4000-5200 keV region with this configuration, then switched off the target and did another 10 minutes test. Results:

Re-increase in DSSSD leakage current c. 14-15.00 6.6.24 

There was a significant temperature spike in the CRYRING hall on the afternoon of 6.6.24 which has, partly, recovered - see attachment 1

15:35

Electron cooler voltage set point = 244.3 V

Electron cooler voltage readout = 243.75 V

Collector current = 4.29 mA

All system checks OK

Cycle time = 6 s

Detector positions: left = 36.54 mm, right = 64.60 mm

Target density = 2.5e11

Injection = 3 - 4 e7 pps

15:50

Injection intensity dropped to 1e7 pps

15:54

Injection intensity back to ~4e7 pps

17:30

All system checks OK

Target at 3.7e11

Beam dropped to 1e7 pps

17:34

Beam back to 3-4 e7 pps

19:10

Beam started varying between 1e7 and 4e7. The operators briefly closed the Faraday cup (~30 seconds), the beam is now back to ~5e7

19:25

All system checks OK

Target at 2.6e11

Beam at 5e7

21:25

All system checks OK

Target at 2.7e11

Beam at 4-5 e7

11:05

Confirmed overlap is at 4 mm under new settings.

For unclear reasons, the bottom-left detector is not seeing the halo anymore since around 10:00. Rutherford still visible and if the left arm is moved in the counts at 5 MeV become apparent.

l s by 20 mm, r p in -> 36.5 mm /  64.6 mm

Target thickness 3E11 atoms/cm2. Beam intensity few E7 at injection. Coasting beam mode.

Data rate x10 compared with earlier. Stats as before - the reason is unclear.

Temps & Merger OK. We should be able to tolerate these rates.

Moved detectors in/out to make sure we were not clipping the beam. A few seconds of data may be present in R41_9

11:30

Checkloaded. Detector 2 is now counting more.

Moved to run 42. No other changes.

13:00

Realised cooler voltage was being read via fault g35 divider. Beam stopped

15:00

Switched to F20. Beam back on. Moved to run 43

Electron cooler voltage = 243.155 V

Collector current = 4.29 mA

Beam energy was slightly off, will try again

Started run 39.

We have the 15N+ beam with 426 keV/nucleon. We see a peak in detector top left (mostly) and bottom right, at 4600 keV. We think it is the beam (nominally 6400 keV) after going through silicon dead layer, which however seems to be thicker than expected (expected 0.7 um, but given 1.4 MeV/um energy loss it seems to be > 1 um).

To understand what was going on we first played with detector and beam position.

At 17:28 detectors are fully out, while we are playing with the electron cooler to try to remove this beam halo hitting the detector.

Detector DSSD0 top left periodically seems to get noisier (statistics up to >2E5) and we need to move the detector in and out to go back to normal operations.

------------------

The beam halo in top left detector, as the detector gets moved in, gets elongated in the y direction instead of the x direction, as expected and previosuly observed.

Run 40 started.

18:36

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachments 1-4

19:43

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachments 5-8

21:15

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachments 9-11

00;25

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

-----------------------------------

Movements and observation in xy plot:

- Move right servo in by 20 mm and we see the halo in the top right moving accordingly (attachment 12)

-Move right pneumatic in, saw big increase on bottom right (attachment 13)

-moved beam position down vertical -6 mm and we see reduced beam spot on top left and more on bottom left

-----------------------------------

Beam - target overlap:

We have yet to obtain an overlap

We cannot do this using the beam lifetime as from beam calc the lifetime from the ring is comparable to the lifetime with a target of 1e11 at/cm2

We have tried using Rutherford. However, we will have to move the detectors IN further as the Rutherford peaks at ~3.8 deg.

Possibly we may require other overlap detections from the ring?

I also think the beam requires some optimisation, electron cooler voltage seems to be fluctuating a lot and we see some features on the detectors when moving the beam / detectors as mentioned above.

02:25

The beam intensity has decreased signficantly (by about a factor of five) since about an hour. Operators tried different things, also consulted with Frank Herfurth, but they could not solve the problem.

There is no device which indicates malfunction.

So, during the rest of the night shift we will continue searching for the overlap (of the beam with the target) with the available beam intensity.

03:30

The beam intensity has improved without any aparent intervention.

We have started a new search for the overlap with 20 minute runs per horiznotal beam position.

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

03:40

After changing the horizontal beam position from 0 mm to 1 mm, the bottom right detector lost the Rutherford peak and its position spectrum looks to be half empty.

Moving it OUT and IN again did not change the situation.

There is no reason to think that this behavior has been caused by moving the beam by just 1 mm.

04:10

The beam intensity has dropped again without any apparent reason. So, at the moment we can not continue search for the overlap.

The bottom right detector seems to be counting normally again (also without any apparent reason). 

06:45

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

07:18

Lost beam again. Gleb is looking for it. Moved right detector out temporarily.

System wide checks as before.

Merger OK, Tape Server OK.

Temperatures OK.

Rates currently OK.

Leakage current decreasing.

10:10

Beam is back. Target is unusually thick at 3-5E11

Checking beam overlap.

Merger & tape server OK.

Temps OK.

Rates OK, a bit higher in 01 and 04.

06:45

All system checks OK

Target density 3.4e11

11:50

System checks OK.

No beam in the ring yet. Althoug some injection may be taking place at low intensities

Target density appears much more stable than before.

Density currently just above 1e11 at/cm2

Note maintanace is required to appc025 so anydesk is currently down.

13:13

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachments 1-5 (also waveforms)

15:00

Merger OK, Tape server OK

ADC data item statistics DO NOT looks as before. NOT OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachments 6-8

15:16

Notice the statistics for aida01-aida04 (DDSD 0, top left) were counting extremely high in the previous check (attachment 6). Previous rate was 0-1 counts.

We tried ASIC check load three times but not effect on the rate.

We then tried 'shaking the detectors' by moving the left pneumatic in and out again.

Rates go back to normal levels (0-1 counts)

14:20

Target nozzle currently being replaced. No beam

We have decided to switch to 15N beam from now on.

Beam energy for 15N is significantly higher than deuteron beam so we have increased the thresholds (slow comparator) slightly for all detectors to 500 keV (0x32).

ADC data item rates - attachment 1

Run 37 started. Alpha background

Data rate ~ 200 kb/sec

17:44

All system checks OK

20:00

All system checks OK

23:30

All system checks OK

01:25

All system checks OK

03:25

All system checks OK.

Target is stable at 3.5e11, with T1=29 K

05:30

All system checks OK

Target density has slowly drifted down, and is now 1.2e11

14:00

Access to the cave as Nikos and Andreas have begun work on the target.

Run 36 started - pulser walkthrough.

Pulser amplitudes of 8, 7, 6, 5, 4, 3, 2, 1

Attachment 1 - pn channels

Attachment 2 - nn channels

Attachment 3 - pn channels (zoom)

Attachment 4 - nn channels (zoom)

Best pn channel looks like AIDA09 - pulser width 63

Worst pn channel looks like AIDA14 - pulser width 148

Best nn channel looks like AIDA12 - pulser width 58

Worst nn channel looks like AIDA16 - pulser width 246

This is approximately the same as pulser widths before the beam time.

09:30

Target density has not improved despite efforts last night. Mid 10 - low 11 density range. We will try to change the nozzle.

Target nozzle moved to the out position.

HKR allowed access to the cave to turn the compressor off. Target nozzle now warming up.

Internal cave work on changing nozzle expected to start at ~11. In the meantime we will let Wolfgang experiment with the beam settings to try to improve injection intensity.

Detectors have been moved out to fully out position

Run 35 started.

1) STOP DAQ [workspace 2, display 1, browser tab 'Run Control']
   all FEE64s should change status from 'going' to 'stopped' *except* whichever FEE64(s) have a problem - typically their status is 'going' or 'error'

2) Restart Merger by selecting the Merger icon [workspace 3, display 2]
    terminal window showing the startup will popup

3) Setup Merger by selecting 'SETUP' [workspace 3, display 1, browser tab 'NewMerger Control']

4) Start Merger by selecting 'GO' [workspace 3, display 1, browser tab 'NewMerger Control']
     all data links will be inactive (red)

5)   Disable data transfer by selecting 'Data transfer Disable #1 all' [workspace 2, display 1, browser tab 'Run Control']

6) Start DAQ

    Start DAQ by selecting 'GO' [workspace 2, display 1, browser tab 'Run Control']
     check that DAQ is *actually* going - if not repeat 'GO'

7) Check WR timestamps by selecting 'Collect all timestamps' [workspace 2, display 1, browser tab 'GSI White Rabbit Control']
     readout times will be displayed for each FEE64
     check that the readout times are monotonically increasing as you read down the list of readout times - if not, contact expert support

8) Stop DAQ 

    Start DAQ by selecting 'STOP' [workspace 2, display 1, browser tab 'Run Control']
     check that DAQ has *actually* stopped - if not repeat 'STOP

9) Enable data transfer to Merger and TapeServer and start DAQ

    Enable data transfer by selecting 'Enable data transfer Enable #1 All' [workspace 2, display 1, browser tab 'Run Control']

    Start DAQ by selecting 'GO' [workspace 2, display 1, browser tab 'Run Control']
     check that DAQ is *actually* going - if not repeat 'GO'

10) Check data is being transferred to Merger and TapeServer

    Select 'Reload' [workspace 3, display 1, browser tab 'NewMerger Control']
     you should see a non-zero 'current merged data rate' and all links should show as green at least some of the time (requires observation over several reloads)

    Select 'Reload' [workspace 3, display 1, browser tab 'TapeServer']
     you should see 'Blocks written' and 'kb written' counters increase

11) Check AIDA data is being forwarded from the TapeServer to MBS [workspace 3, display 2, command terminal]

12) Restart should now have been successfully completed. Please inform the 'on shift' crew' that AIDA is forwarding data.

    If not, please request expert assistance.

19:08

Beam energy = 3 MeV.

Horizontal beam position = 4.0 mm, vertical beam position = 0.0 mm.

Target density ~ fluctuating

Beam intensity at inj ~ 1.7e7

Detectors are positioned IN. Left arm = 36.54, right arm =  64.60 mm

MBS signals saved from motors code

Histograms and stats zero'd, monitoring code restarted.

Beam in the ring ~ 6 minutes.

Pressure in YR09 E target ~ 4.36e-11 mbar.

Merger error recovered

White rabbit time stamps

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

21:27

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

23:00

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Statistics attachment 5

Merger attachment 6

00:42

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Density is oscillating between E10 and low E11.

attachment 7 is statistics, attachment 8 is temperature, attachment 9 is merger, attachment 10 is spectrum browser.

02:20

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Density is oscillating between E10 and low E11. ( last 15 minutes below 2E10)

attachment 11 -13

From 2:00 target density falls below 2E10 and started decreasing to the E9 range. At 2:40 we started playing with x-y to get to higher density. At 3:30 we are at 5/6E10 and waiting to see if it stabilizesto that or if it needs more playing.

04:06

Target density being 1-2E11 since 5 minutes

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachment 14 statistics, attachment 15 merger

05;53

Target density 1E10, sometimes e11, before going down to low E10 and we need to play a bit with x-y to recover it

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachment 16-18

07:35

Target density 2.5E11, after changiny y position to 1000

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

09:00

Target density has not improved despite efforts last night. Mid 10 - low 11 density range. We have asked HKR to remove beam from the ring and allow access so Nikos can change the nozzle.

Beam off now, access granted. Will begin warming nozzle. Internal cave work on changing nozzle expected to start at 11

Run stopped.

Final monitoring code histogram attached

16:26

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Nicos came in to optimize target density.

18:39

aida02 in the MERGER aka aida03 elsewhere has a red background, but still appears to be transferring data. Rates are fine. Temps are fine. System wide checks unchanged.

See attachments. Checkloaded x2 - no difference. Unclear what the issue is.

15:15

Run 32 started - Beam, no target

Beam energy = 3 MeV.

Horizontal beam position = 4.0 mm, vertical beam position = 0.0 mm.

Beam intensity at inj ~ 2.5e7

Detectors are positioned IN. Left arm = 36.54, right arm =  64.60 mm

Histograms and stats zero'd, monitoring code restarted.

Beam in the ring ~ 5 minutes.

Pressure in YR09 E target ~ 4.5e-11 mbar.

Motors code crashed. Beam removed from ring to re-home detectors.

15:20

Beam in the ring again, detectors homed, no target

Detectors have been set up to send signals on injection / dump

15:35

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

8:13

Since 6:40 the target density dramatically dropped to 10^9 since then it has been unstable and did not recover. Currently it is around 8e8.

09:00

Target density has been increased to the high -10, very low -11 region. We will keep this run going unless the density is increased further.

10:21

Beam energy = 3 MeV.

Horizontal beam position = 4.0 mm, vertical beam position = 0.0 mm.

Target density ~ 1e9 at/cm2 (no target, get lost quite quckly)

Beam intensity at inj ~ 1.7e7

Detectors are positioned IN. Left arm = 36.54, right arm =  64.60 mm

Histograms and stats zero'd, monitoring code restarted.

Beam in the ring ~ 6 minutes.

Pressure in YR09 E target ~ 4.36e-11 mbar.

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

target density has been fluctuating between E9 to E12. We can very clearly see the increase in elastic counts on our detector during high density periods.

Attachment 1 - rate plots at 1E12 at/cm2

Attachment 2 - rate plots at 1E9 at/cm2

12:26

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

After reaching a density of > 10^12 a bit before 11:00, the valve got closed. When a valve is closed, can be observed a dramatic change in the plot and one of the three green ligths of atps7vaccrz1 (0,2,4) is turned off. Nikos opened it, and now it seems stable again around 1e11.

14:07

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

15:05

Run stopped as target density is rubbish. Might as well get beam background

Beam energy = 3 MeV

Horizontal beam position = 4.0 mm, vertical beam position = 0.0 mm.

Beam intensity at inj ~ 2.5e7

Detectors are positioned IN. Left arm = 36.54, right arm =  64.60 mm

Cycle time ~ 6 minutes

01:05

Target density still very unstable

02:45

Target density has dropped to ~1e9 and has been at that level for 30 minutes. We will try to move the target a bit and see if we can get an increase. Target position is currently x=-12400, y=2900

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

04:15

We were able to recover some target, but it is still very unstable. The new position is x=-12800, y=2000

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

06:15

Target still unstable, fluctuating around the 5e10 region

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Beam energy = 3 MeV

Horizontal beam position = 7.0 mm, vertical beam position = 0.0 mm.

Beam intensity at inj ~ 2.5e7

Detectors are positioned IN. Left arm = 36.54, right arm =  64.60 mm

22:52 (Attachments 1 -3)

Beam is very unstable

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

00:47

Beam is still very unstable.

We checked for beam-target overlap position and found a clear increase in counts at beam position 4.0 mm. We have left the beam at horizontal = 4.0 mm, vertical = 0.0

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

16:15

In the previous run while working on the target it was discovered that the valve was closed! Probaly this happened around 10 am, we are not sure.

The gas target inlet valve is open again, working on the target.

Beam energy = 3 MeV

Horizontal beam position = 7.0 mm, vertical beam position = 0.0 mm.

Beam intensity at inj ~ 2.5e7

Detectors are positioned IN pneumatic only. Left arm = 62.71, right arm =  64.60 mm

Histograms and stats zero'd, monitoring code restarted.

Beam in the ring ~ 7 minutes.

Pressure in YR09 E target ~ 4.5e-11 mbar.

18:03 ( Attchments 1 -4)

Still no target!

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

20:23

We have the target back. S1( grafana) 4.8e-8. The target thickness read by the system 5E11 atoms/cm2 but apparently the formula is wrong and the value should be almost e12 atoms/cm2.

. We have now proper beam and target and we

16:10

We start a new run after doing some test with the motor. Injection time is now a 6s, moving of the motors is working fine.

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

No target