Beam issues due to too long storage time in the last hours. Motors moved out and not moving.

Decreased storage time to 70 s. Seems OK now. Restarted motor movement as before

Started new run R86

23:20

JM thinks we cannot see 7Be locus on run 24. Possibly the right arm cannot get close enough.

Stopped moving right arm

Started moving left arm as previously: 32.52 mm -> 77.56 mm

Checked with bunched beam: not clipping. Possibly we could go further in - to be decided.

Started run 25

Target - 1.1E12 atoms/cm2

Beam - 1.2E7 pps

Root histograms refreshed.

Temps OK - attach

Stats OK - attach

All checks OK

Leakage OK - attach

Spectrum browser 1, 7, 8 attached

00:00

Run continues OK

Temps OK, Stats OK, Merger OK

01:15

Run continues OK

Temps OK - attached

Stats OK - attached

Merger OK

Rates OK - attached

Also attached current histograms

03:10

Motors now moving 32.77 -> 77.56 mm. Unclear why, should not affect results.

Target 1.1E12 atoms/cm2

Current 1.4E7 pps

Temps OK - attached

Rates OK - attached

All checks OK

Merger OK

03:37

7Be locus appears to be clearly visible. Attach 18

04:32

Temps OK

Rates OK

Merger OK

05:30

Temps OK

Rates - aida10 showes intermittently high rates around 10k. See attached. Seems to be linked to beam, already observed last night.

06:10

Temps OK

Rates OK - aida10 still counting 10k with beam, 300 without

Merger OK

Histograms attached

7:23- LB,PW

All checks OK, general behaviour consistent with previous observations. Beam current ~ 1E7 pps

8:40

All good, attachment 27 is the spectra. Beam current 1.3E7 pps.

9;50

All good, target very stable at 1E12 at/cm^2. Noticed also Aida01 and aida02 show same behaviour as aida10, but the maximum rate is between 1000-2000 (instead of the 10000-20000 of aida10)

Run 25 stopped 10:45, Run 26 started -> laser spectroscopy laser test

11:13

ML enabled ring signals remotely.

Used FakeMotion.dat (read FakeMotion.dat from InteractiveMotion.x).

Started run 50.

Cooler voltage moved up by 0.1 V. Did not refocus.

Setpoint = 244.4 V

Read = 243.85 V

Collector current = 4.3 mA

Target thickness 3.4E11 atoms/cm2 now stable

Injection 1-4E7 ions

Realised motors were not in.

Moved detectors in (36.54 / 64.60 mm)

Started run 51. Ignore run 50.

11:46

Realised the left half of DSSD BL was not counting. Checkloaded. Fixed it.

12:00

Fire alarm? Stopped later. EM thinks it is a test.

13:00

Run continues.

Rates OK. Merger OK. Writing to disk back to 200 kB/s. Nothing changed, reasons unclear.

FakeMotion.dat continues

System wide checks as before

Temperatures OK

13:36

Beam lost. Called HKR. Detectors out. Run continues. FakeMotion stopped

14:09

Beam is back. Detectors back in. FakeMotion.dat restarted.

15.10 High rates observed aida01-auida04 ( c. 250k/FEE64)

          Cycled Left Servo

         Rates normal

10:58

As Run 61, no target for background.

200 keV/A

Saved the ASIC settings for currently running. I made a mistake and overwrote the 2025APR08 settings.

Current settings have aida13-16 set to MEC channel and slow comparator set to 0x64.

All ither channels set to 0xc slow comparator.

Energy changed to 150 keV/A a few minutes before the end of this run. No storage. Waiting for the new beam.

16:34

Like Run 73, but particle detector in YR10 now active, and recorded in MBS.

Clear effect of target on beam lifetime. Target off -> nearly no counts.

Attachment 22 - IPM (no target)

Attachment 23 - IPM (target)

Attachment 24 - YR10 particle detector (gap in events corresponds to target off period)

16.42 DSSSD bias & leakage current - attachments 1-2

DSSSD #4 currently conditioning at -20V

FEE64 temperatures OK - attachment 3

ADC, DISC, PAUSE & RESUME data item stats - attachments 4-7

System wide checks OK *except* WR deocder status aida04 - attachment 8

WR timestamps OK - attachment 9

per FEE64 Rate spectra - attachments 10-12

per FEE64 1.8.L spectra - attachments 13-14

per FEE64 1.8.W spectra - 20us FSR - attachments 15-16

pulser peak width aida06 69 ch FWHM, aida08 67 ch FWHM

Merger, TapeServer OK - attachments 17-18

ASIC settings 2025Apr08-13.45.30

 aida01-aida04 slow comparator 0xc

aida05-aida12 slow comparator 0x8

aida13-aida16 slow comparator 0x64, LEC/MEC 0x1

17.23 CRYRING vacuum and temperature - attachments 19-21

17.34 routine checks OK

target density c. 5e+12, beam 3e+6

18.40 changed target x,y position to check correlation between target density and detector counts. New position: x:-1500, y:2400.

checks OK.

target density c. 3.7e+12, beam 3.1e+6

20.00 online analysis - per DSSSD energy spectra - attachment 25

 t, h and p energy peaks clearly observed DSSSD #1 and #2 - p energy peak less clear in DSSSD #3

20.30 checks ok

target density increased to c. 5e+12 for some minutes then back at c. 3.7e+12, beam 3.1e+6.

21.47 checks ok

target density increased to c. 5.7e+12 around 21.35, then back at c. 3.7e+12. beam 3.1e+6.

22.30 online analysis - per DSSSD energy spectra - attachment 26

22.35 Analysis of data file G22-205/R74_29 - attachment 27

no timewarps, all deadtimes << 1%

22.45 DSSSD#4 bias -20V -> -40V, leakage current -2.7uA -> -4.09uA

23.14 DSSS\D#4 leakage current c. -9uA, return to bias -20V

23.21 target density slightly unstable in the last hour, changed nozzle position to x=-2000, y=2500.

00:04

Temps OK

System wide checks OK

Rates OK

Merger OK (1400 kb/s)

Target oscillating, but looks usable. Need to have another look at temperatures tomorrow morning.

01:57

Temps OK

Rates OK

Merger OK

Target getting thicker.

05:00

Temps OK

Rates OK

Merger OK

Target fluctuating

7:20 All sysytem checks ok. Target lost density @ 6;55 from 4.6e12 to 2.6e12 - will try moving. Update 7:30 after moving density back up to 4.4e12.

8:45 All Checks ok but target is fluctuating - really wants to be around 2e12. Had it up to 5e12 about 25 mins ago. Naughty target tbh.

9:25 All checks ok, gone to no storage as now tuning next beam energy.

10:30 All system checks OK, still tuning.

11:38 All system checks ok, still tuning. Frank entered cave to adjust magnetic field as the beam was not cooling at 90 keV/A

12:36 All checks okay, cave still open

13:40 All checks okay, tuning beam currently

14:50 All Checks OK. Target beam overlap currently happening - scanning range not showing anything. Target back on but not hitting - thickness 1.2e12.

Attached is the temperature plot for bakeout period including tags for NEG activation etc.

28 October -> 27 November
--->See shared Excel document for CARME pressure values<---
https://uoe-my.sharepoint.com/:x:/g/personal/cbruno2_ed_ac_uk/EbaoBvhq8zFFtmuakXKjQWQBTqjjzilT6lk9BmchoxlMNQ?e=XU8DzE

 
30 October
07:30 Baking code has been shut down, we have no log of the temperatures. Restarted (T=0)
19:40 Pressure back in the E-12 mbar range.

31 October
08:47 Back in the low E-11 mbar range. See temperature plot attached.
15:57 Back in the E-12 mbar range.

1 November
12:30 Pressures updated. Temperature plot updated.

2 November
08:52 Pressure reached E-10 mbar overnight, now back in the E-12 range.
Temperature increasing. See attached.

3 November
08:37 Pressure stable in the E-12 mbar range.
15:36 Pressure mostly stable in the E-12 mbar range
17:30 KM reports re-arranging the mains power connection to borrow an extension reel. No obvious effects on pressure.
18:24 Pressure stable in the E-12 mbar range. Updated temperature plot.

4 November
08:39 Pressure stable in the E-12 mbar range.
Temperature plot updated.
19:31 Pressure mostly stable around 5E-12 mbar

5 November
10:26 Pressure stable in the E-12 mbar range.

6 November
12:26 Pressure stable in the E-12 mbar range. 

7 November
11:50 Pressure stable in the E-12 mbar range.
Temperature plot updated.

8 November
20:39 Pressure increasing again. Now in 1E-11 mbar range

9 November
08:50 Pressure returned to E-12 mbar range.
Temperature plot updated
16:51 Pressure fluctuating around 7E-12 mbar range.

10 November
09:04 Pressure oscillating in the 7E-12 mbar range

11 November
08:27 Pressure mostly stable in the 5E-12 mbar range

12 November
08:21 Pressure mostly stable in the 5E-12 mbar range

13 November
08:29 Pressure increased suddenly to 7E-9 mbar yesterday at 14:00, from 6.5E-12 mbar. Was the valve closed? (Confirmed
by KM)
Pressure appears to be slowly recovering. Currently in the low E-10 mbar range.
Temperature plot updated.

15:40 Pressure does not appear to drop. Currently stable around 2E-10 mbar

18:10 KM reports Ion pumps have gone off (tripped by high pressure?)
IE514 gauge still reading 1E-10, but SAES D2000-10 ion pressure gauge reading 1E-12.
Someone will check tomorrow in person.

14 November
08:13 Pressure stable in the 2E-10 mbar range. Does not appear to decrease.

15 November
08:24 Pressure stable in the 2E-10 mbar range

16 November
08:23 Pressure increased to 1E-9 mbar (potentially due to heating being turned on at week start).

17 November
08:18 Pressure back in the E-12 mbar range since yesterday afternoon.
Change was sudden and CM52 control module appears to have been moved in-between. 
Unclear what was done locally.

18 November
08:40 Pressure mostly stable in the 5E-12 mbar range.

19 November
07:55 Pressure remains stable in the E-12 mbar range.
Temperature plot updated

20 November
08:00 Pressure remains stable in the E-12 mbar range.

21 November
14:16 Pressure remains stable in the 5E-12 mbar range.

22 November
08:08 Pressure remains stable

23 November
08:24 Pressure remains stable

24 November
08:05 Pressure remains stable
See ELOG entry by JM

25 November
See ELOG entry by TD.
Valve partly closed.

26 November
08:58 Pressure in the E-10 mbar range, very slowly decreasing

27 November
21:07 Pressure stable in the 2E-10 mbar range. Does not appear to be decreasing

28 November
17:49 Pressure stable in the 2E-10 mbar range.

Disconnected cables from CARME motors and turbo. The turbo has to go to allow Carme to slide out. Crane may be required to lift because it's in a very hard spot to access.

Dolly mostly built. See attached. Left side doesn't quite fit right by 1-2 mm. Might be okay anyway but will put some shims to avoid any shaking during sliding.

Waiting for the rails to arrive due to GSI procurement issues.

Plan to mount new feet and bellow support tomorrow.

Also plan to split CARME at the smaller flange towards the interaction chamber, after the bellows and before the bellows towards the magnet on the downstream side.

Removed turbo pump and set aside in a box. Considering switching to the other turbo to avoid degradation due to lack of use.

Installed bellows support and OG devised support to avoid bellows sagging when Carme is split open.

Attempted to install new CARME feet, but there were issues. Feet with slots produced do not match design drawings by PB. Slot is in the wrong side. Furthermore Carme interaction chamber flange thickness is 36 mm vs. 36.5 mm in drawing. DR can modify feet to make them fit tomorrow.

Now just waiting for rails to open CARME. Will arrive tomorrow or on Tuesday, after weekend and Mayday.

(28 April)

Mounted rails on dolly. The rails don't smoothly connect to those on the Aluminium frame and some thin metal shims were required to get the correct height. A metal support had to be placed above the Delrin pads to support the rails above the gap between frames.

All side feet were mounted but extensive modifications were required to slotted feet due to them not being manufactured to drawing, and to Carme middle section flange width being incorrect (see previous entry).

Removed brakes and started sliding CARME out. The dolly and the aluminium frame came partly separated as the weight of the side feet was shifted on the latter. Strapped them together. No damage.

Kept sliding. Sliding when the carriages passed from one rail to the other was quite hard. The back carriage on the left looking downstream lost a single ball bearing when crossing over. A more sophisticated solution is probably required.

Once Carme was on the dolly, opened it using M8 jacking bolts and lifted away front and middle section. 

No obvious damage inside but strain relief did not work as intended. Photos to be uploaded after more detailed inspection on Saturday.

Plan to install right hand side detectors over the weekend. Unclear if bottom left detector is damaged and needs to be replaced.

(29 April)

Inspected CARME after opening. See attached. Some key takeaways.

- No visible damage to the detectors or the Kapton cables. No visible deposits or dust on the detectors either. 

- No damage even to the fragile thermocouple wires

- The strain relief on the top and bottom did nothing. Those on the sides may have helped.

- The split funnels on top fell and fortunately missed the detectors. We should not keep them. Unclear if they feel when moving CARME or during the beamtime but either is too dangerous. We need another solution or we'll have to do without.

- Obvious traces of white dust particles over the chamber. Most likely MACOR.

Jacked out harness for bottom left detector that was not accepting bias. MACOR shavings fell off while jacking out. MACOR connector on side with no pins is clearly damaged. See attached. Should not affect performance.

Tested bias pins - they work. No visible damage to the detector except one bias bond wire has disconnected. Possibly one more nearby. TD thinks this is not enough to explain observed behaviour.

Mounting a DSSD on the plate while it hangs in Carme appears possible but very risky. Dismounted whole left support plate, and right support plate. 

Unless a clear fault can be identified for either the bottom left detector or its harnesses, both the detector and the harnesses will be replaced. Plan to remount top left detector with the same harnesses.

Plan to mount two more detectors on the right hand plate.

(31 April)

Remounted 3335-12 on top and new 3335-1 on bottom of left hand plate. Used new dog legs and old standoffs.

Dismounted all harnesses and feedthroughs from CARME. Dismounted all blind flanges on right hand side. Also had to dismount bottom SAES feedthrough due to a bolt falling inside.

Remounted feedthough. Remounted left hand detector plate.

Prepared new 3335-11 and 3335-13 on top and bottom of right hand plate. Planning to mount tomorrow.

Also planning to start jacking in detectors to new harnesses.

Not possible to test any detector on the bench due to lack of appropriate multimeter probe. Will have to test with harnesses.

Mounted four detectors on Carme ad well as four cable harnesses.

Cables for new, shorter harnesses appear still too long. Likely the model is not correct somehow.

One feedthrough flange was found to be damaged by an adaptor card. Tried to fix in vain. One pin is missing. Replaced with another.

Completed mounting harnesses and detectors.

The strain relief support for the bottom most two detectors on the feedthrough side was not mounted because we could not find enough MACOR parts and mounting flanges. We cannot find them in GSI, possibly they are somewhere not obvious in Edinburgh.

The strain relief on the detectors' side are still being manufactured.

We plan to test the detectors electrically from next week without moving the dolly. DR and OG to find a temporary mounting point for the manifold so that FEEs can be cooled in current configuration.

Removed tent, octagon, Neg cables.

Disconnected and removed Baking Pi, TC08, thermocouples.

Tested new rails, plates, fees - it fits. Need to check on the flange next.

Will soon turn off CARME IE514 gauge to bias test the DSSDs.

All four detectors were bias tested using the new flexi-rigid adaptor cards. Note the LK-1 jumper was removed from the adaptor cards so that 'open line' was observed between the bias lemo and the ground. Attachment 1 shows VI curves for all detectors. The maximum leakage current for all detectors appears lower than previous bias tests eg elog 400 -> temperature was ~17C today compared to ~20C for elog 400. We also performed a bias test using the old adaptor cards to see if there was any difference between the old and new cards. No significant difference was observed. For the top left detector we initally observed a significantly large leakage current (4.2 uA at 20V, 8.7 uA at 30V) which had ~1 uA fluctuations. We left for 5 minutes to see if it stabilised and the leakage current suddenly dropped to what is shown in the plot. This leakage current then appeared stable for the rest of the test. Perhaps this effect was observed by Tom but for the top right detector in elog 421?

We plan to connect the bias as we did in the 14N+d measurement so that we can monitor and plot the leakage current over the weekend.

Assembled most of the connectors on the new (green) manifolds. Two blanking pulgs stuck when mounting - cannot remove them or tighten them. Swarf? Will ask Davide's help tomorrow. Cannot use the manifold until this is fixed.

Checked FEE assembly in cassette. Need to shorten black Delrin supports by ~6 mm. Holes should end up in the correct position thanks to rails being effectively longer (same length, different hole position on FEE cassette). Will ask Davide to skim one if possible. If not, will have to mount without supports.

Finally managed to get the CAEN program working to control N1419 remotely from Baking Pi. Plotting bias and leakage current overnight to test stability. See attached. IE514 sensor off for these tests.

Left bias in overnight. Leakage current decreased and stabilised. See attached. Bias off as we prepare to mount the fees.

Davide extracted the stuck blind plugs and re-threaded all missing ports. Completed manifold assembly, except for main inlet/outlet - left for plumber.

Cut 8x2 2m hoses and assembled with Swagelok quikfit and teflon ferrules.

We're missing back ferrules in brass for the repaired fees. It should be possible to buy them from GSI.

Attempted assembly of fee, Flexi rigid and black delrin support on bench. Davide shimmed the black delrin supports by 6.5 mm from ridge. They now fit length wise on new adaptor cards. Unfortunately, the decision to flip the connector means the Flexi rigid is no longer at the correct height for the erni connector in the fee. See attached.

Inserting the Flexi rigid without the black support is too dangerous, and defeats the point of having rails. Will probably mount Flexi rigids tomorrow on black support, not screw into the fee holder, and align by eye. Tried once and it works - see last two attachments - but it will have unclear impact on the ease to unmount the fee without damaging the Flexi rigid and will make mounting fee holder on flanges harder. No alternative solutions in current timeframe.

Started mounting some FEEs. We ran into some mechanical issues due to the new ERNI connectors on the new flexi-rigid adaptor PCBs. Davide skimmed 6.5 mm off the edge with the groove (the groove is gone). This is suffiicent to support the flexi-rigid and in spite of our earlier concerns, the flexi-rigid can be mated/un-mated with the FEEs without major alignment issues.

We still have issues for the bottom-right detector, where the FEE holder will just not fit - will probably figure something out with Davide.

We observe a peculiar issue with the bottom-left detector. At 150V, the leakage current for this detector as tested with just the adaptor cards on the feedthroughs that carry the bias (no FEEs) is of the order of 3 uA.

We mounted all four flexi-rigid PCBs - still 3 uA.

We mounted the FEE that slots into the bottom-most feedthrough (which corresponds to the n-n bias). Still 3 uA.

We mounted the FEE that slots in to the second bottom feedthrough (not corresponding to bias). 15 uA! Upon lowerint the bias, the leakage current goes to zero around 30V as opposed to 0V like all the other detectors, and like this detector when this particular FEE is not mounted.

Tests were performed exchanging all PCBs, and all FEEs. The same behaviour is observed. It is not an issue with the FEE or the PCB. We suspect some cross-contact between detector bias and some strip that feeds into the second FEE? In any case, it is most likely a vacuum side issue - nothing we can do now.

The detector can be biased to 80V or so without major issue, and it appears this behaviour improves over time, i.e. leaving the bias on reduces the leakage current dramatically so it may even be possible to reach 150V.

See plots attached. Note in 2nd plot the plotting script has some issues - detector names are correct until the bias in Ch#2 is brough to 150V, then the colours are incorrect. Only Ch#2 was being changed. Note the drop in leakage current by a factor 2 just increasing the bias to 150V for a few seconds and returning down.

Mounted water manifold on CARME with help from GSI plumber. Connected all the hoses with Swagelok self-locking connectors. Tested for water leaks - it leaks from nearly every port. The issue appear to be the connections between the manifold and the plugs, as opposed to the plugs and the hoses which do not leak.

Will try to find a solution tomorrow.

FEEs connected from bottom-left, top-left and top-right detector.

Top right detector showed same behaviour described in previous ELOG entry. Removed all jumpers from PCBs. Beahaviour is gone.

Removed all jumpers from flexi-rigid PCBs for bottom-left detector. Behaviour is improved, but not gone - still 13 uA at 150V. Around 3.5 uA at 120V with no conditioning - that may be the working point.

Missing

- Power cables and ethernet cables for half the fees

- Fix leaks on water manifold

- Fix / change / re-arrange fee holder for bottom-right detector to avoid it fouling on CARME frame.

After discussions with Davide, changed the holes in the FEE holders for the bottom-right detector to slots in order to slightly change the angle that the FEE inserts into the flexi rigid PCB. This was sufficient, with some difficulties, to insert both FEEs into the flexi rigid.

Attempted to finally mount the last two fees, the top two for the bottom-right detector, which should have been very easy. Somehow managed to break one pin on each PCB in similar spots. One is in the third column (not in use), and one is in the fourth column (in use). This latter PCB connector was unfortunately dropped while trying to dismount it, and the ERNI connector cracked. That connector can be used anymore? Cannot find spares in GSI, must be in Edinburgh?

Dismounted all the hoses from the manifold, and starting to remove teflon from the plugs. Will use instead gaskets + anti-sieze compound. Quite a number of plug thread are damaged, likely in welding. Unclear if this was the reason behind the leaks. Should be done with the manifolds tomorrow.