Attached are the plotted curves from vacuum and heater temperature (actual and set values from ISOHEAT controllers) during the bakeout process. Channel assignment as per post 433.

08:00
Temps OK
System Check OK
White Rabbit fail diff: 99
Write Speed: ~1.0Mb/s
Leakage Current: ~3.47uA
Cryo Temp = 129.2K setpoint (unchanged)
Pressures stable

AVG Pressures:
YR07: 2.06e-10mbar
YR08: 2.71e-9mbar
YR09: 1.06e-9mbar (up from previous check)
YR10: 1.78e-10mbar

09:00
Temps OK
System Check OK
White Rabbit fail diff: 101
Write Speed: ~1.2Mb/s
Leakage Current: ~3.47uA
Cryo Temp = 129.2K setpoint (unchanged)
Pressures stable

AVG Pressures:
YR07: 1.88e-10mbar
YR08: 2.28e-9mbar
YR09: 9.15e-10mbar
YR10: 1.52e-10mbar

10:00
Temps OK
System Check OK
White Rabbit fail diff: 102
Write Speed: ~1.2Mb/s
Leakage Current: ~3.47uA
Cryo Temp = 129.2K setpoint (unchanged)
Pressures stable

AVG Pressures:
YR07: 1.93e-10mbar
YR08: 2.64e-9mbar
YR09: 1.13e-9mbar
YR10: 1.55e-10mbar

We are moving the detector in run 56

11:55
Temps OK
System Check OK
White Rabbit fail diff: 102
Write Speed: ~1.2Mb/s
Leakage Current: ~3.47uA
Cryo Temp = 129.2K setpoint (unchanged)
Pressures stable

AVG Pressures:
YR07: 1.99e-10mbar
YR08: 2.6e-9mbar
YR09: 1.03e-9mbar
YR10: 1.7e-10mbar

15:45

New run 71 - beam on target with definite target overlap [coasting]

Cooler voltage setpoint 247.3 V.

FC20 read value 246.75 V.

Right arm at 64.60 mm

Left arm IN at 36.54 mm18:00

FakeMotion script running

horizontal beam position 1.0 mm (new beam target overlap)

vertical beam position  -5mm

Beam intensity 7.0e+7 particles.

Target density ~4e11 at/cm2

Target temperature is 36.6 K. Values of E1 is 820 Hz, 2.6A, 1.4e-1 mbar

16:36

No difference observed between bunched and coasting

See attached screenshots to compare to previous run

Saw an increase in the data rate to disk ~ 2000 kB/s. On spectrum browser we saw aida15 had HEC reading hot. ASIC check on aida 15 resolved issue

18:00

Beam intensity 6e+7 particles.

Target density ~6e11 at/cm2

Target temperature is 36.6 K. Values of E1 is  820 Hz, 2.7 A, 1.5e-1 mbar

Aida03 detector temperature is 66 degree.

20:00

Beam intensity 6e+7 particles.

Target density ~6e11 at/cm2

Target temperature is 36.6 K. Values of E1 is  820 Hz, 2.7 A, 1.6e-1 mbar

Aida03 detector temperature is 63 degree. Screenshot is attached.

21:00

arget densityis dropped drastically. A temperature is ncreased signifiantly.

Beam intensity 6e+7 particles.

Target density ~2.7e9 at/cm2

Target temperature is 9 K. Values of E1 is  820 Hz, 2.7 A, 4.2e-2mbar

Aida03 detector temperature is 63 degree. Screenshot is attached.

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

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.

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:

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

- Motor fully out position.

SW3

- Merger OK

- Screenshot uploaded

- Data rate : 236 kbytes/s

SW4

- current plot uploaded

SW2

- T OK

- system wide checks OK

- Check statistics tab ok

- Spectra ok

SW5

4 plots uploaded

02:04

Temps OK

Data Rate - ~1.1Mb/s

System Check OK

White rabbit diff - 83

Leakage Current - ~3.475uA

YR09 AVG: 7.51E-10mbar

YR10AVG: 1.21E-10mbar

YR07AVG: 1.67E-9mbar

YR08AVG: 1.91E-9mbar

02:56

Temps OK

write speed ~1.2Mb/s

System check OK

White rabbit diff - 89

Leakage Current ~3.472uA

Pressures stable

Beam intensity ~3.0e7

cryostat setpoint 129.2K (unchanged)

AVG Pressures:
YR09: 8.48e-10mbar

YR10: 1.28e-10mbar

YR07: 1.71e-10mbar

YR08: 2.1e-9mbar

Aida 1 1*L plot attached. Some channels appear missing. Width of rutherford peaks ~280-300 channels.

03:52

Temps OK

System Checks OK

White rabbit diff: 90

Data rate: 1.2Mb/s

Leakage Current: 3.474uA

Cryo temp = 129.2K (unchanged)

Pressures stable

AVG Pressures:
YR07: 1.74e-10mbar
YR08: 2.15e-9mbar
YR09: 8.61e-10mbar
YR10: 1.32e-10mbar

04:52
Pressure seems to be climbing a little but still stable (just peaked at end of check)
Temps OK
Write Speed: ~1.0Mb/s
System Checks OK
White Rabbit fail diff: 90
Leakage Current: 3.47uA
Cryo Temp: 129.2K (unchanged)

AVG Pressures:
YR07: 1.79e-10mbar
YR08: 2.3e-9mbar
YR09: 9.46e-10mbar
YR10: 1.41e10mbar

Avg pressures plots for last hour and last 6 hours attached.

05:55
Temps OK
System Check OK
White Rabbit fail diff: 90
Write Speed: ~1.0Mb/s
Leakage Current: ~3.47uA
Cryo Temp = 129.2K setpoint (unchanged)
Pressures stable

AVG Pressures:
YR07: 1.79e-10mbar
YR08: 2.21e-9mbar
YR09: 8.64e-10mbar
YR10: 1.36e-10mbar

07:00
Pressure Stable
Temps OK
System Check OK
White Rabbit fail diff: 90
Write speed: ~1Mb/s
Leakage Current: 3.47uA
Cryo Temp Setpoint: 129.2K (unchanged)

AVG Pressures:
YR07: 1.66e-10mbar
YR08: 1.93e-9mbar
YR09: 7.63e-10mbar
YR10: 1.26e-10mbar

Frank has been tuning the beam since 08:00

detectors moved fully out

11:20

New run (R68) started at 11:20. Put into no storage mode as rates are high during beam tuning. Cut off the end of last nights run when analysing

System checks OK

13.20 DSSSD bias & leakage current OK - attachment 1

FEE64 temperatures OK - attachment 2

ADC data item stats - attachment 3

per FEE64 1.8.W spectra - attachments 4-5

per FEE64 Rate spectra - attachment 6

 aida16 producing HEC data - Chck ASIC load to fix

TapeServer - no storage mode

13.35 aida01-aida04 c. 250k ADC data items/s - will await completion of current beam/target scan to fix by cycing Left DSSSD motion

14.00 CB cycles Left DSSSD motion to fix aida01-aida04 rate issue

CRYRING vacuum & hall temprature - attachments 7-8

14.28 New run data file G22-201/R69

Beam/target overlap optimised - details to follow

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.