at 11:34:50 sek on 11 march a spike in counting rate of some Ge detectors is observed. Buffers not cleared properly?

Again beam intensity gradually increased reaching 2.4 kHz ontotal rate EAGLE_0 ch4.  Beam intensity reduction requested. 1.8 kHz on ch4 after reduction.

14:12 beam intensity instability. Rapid increase of beam intensity - twice the previous value. Returned to normal after 4 minutes.

Large beam intensity instabilities from 14:10 till 14:40.  Beam intensity reduction requested. CH4 on Total rate EAGLE_0 returned to 1.9kHz. Intensity became stable.

Again beam intensity to high. Reduced to 2 kHz on ch4 GE

Beam stable, counting rate within limits, plunger distance within the given tollerance, gamma spectra ok, everything looks good but....

(yes there must be some "but"), refreshing of EAGLE_array_monitor.mat and NEDA_array_monitor.mat are out of sync. Mostly pure red colour is dysplayed. Not very usefull and (I suppose) missleading information.

For a split second a red "NO DATA" notification appeared in the top right corner of Counting rates dashboard.

It looks like it did not change anything in data collection.

Run 27 with single gamma trigger

Plunger feedback system is not conected.

Data

Position = 522.6

Supposed = 520

Plunger run = 32

Micrometer = 525.3

Run Data = /onlineNEDA_00/xData/currentRun/needleRU_i27_0027_0027.caendat

RU = 5.10 Mb/s

LF = 3.75 Mb/s

Nothing really to report. The data rates are slowly decreasing from around 3 am. Still observing the frequent sharp minima in the data rates.

Using  the data which we've sorted to date, I looked into the gamma-gamma coincidences and have identified a number of nuclei e.g. 50Cr, 52Mn, 55Fe which would be consistent with fusion-evaporation reactions involving the sulphur-32 projectiles and aluminium-27. Such reactions would yield a 59Cu comound system and these channels would be populated as a result of the evaporation of a combination of alphas, protons and neutrons.

These lines are intense and the conicdences are very clear and clean. I think this suggests that the beam is hitting some aluminium components within the plunger chamber. This could be the plunger vessel itself or the target frame perhaps.

There is another interesting observation: some of the identified transitions are emitted from levels which have sub-ps lifetimes. At this plunger distance, we might expect these lines to be fully Doppler shifted as they would decay in-flight well in advance of reaching the stopper. Yet, we observe these lines with their non-Doppler shifted energies suggesting that they are not being emitted in-flight but rather at rest. This might suggest that the 32S+27Al reactions are taking place within some thick piece of aluminium. Some of the lines show signs of having been shifted in energy to some extent which might indicate that not all of the ions are completely stopped. The observed lineshapes seem to be consistent with the short-lived states showing evidence of Doppler shift while the decay of the "longer-lived" states (~9 ps) are very sharp.

I haven't slept for about 24 hours so I may be talking absolute sh*te (famous Scottish word).

Plunger run files for later to calculate error in the distance

Before this run TSs were moved on the LF level, so the BU has easier job to do and everything is more stable.

BU gate was changed from 1500 to 500 ns, this stay valid from now on.

Run 40 Started.

New target

Offset 100 um

RUN CONTROL = 40

Data = /onlineNEDA_00/xData/hil099/run_0040_06-03-2023_00h38m10s/needleRU_i40_0040_0000.caendat

RU = 7.21 MB/s

LF = 3.55 MB/s

Plunger ;

Planger run = 8

0-Point = 232, 7 um

Supposed Distance = 234,7 um

Micrometer = 187.5 um

Position = 241.1 um

Actual Distance = 234,5 um

Voltage =4,106V

Beam dumb =

Collimeter =

Run 26 is going on but not much for the moment in terms of any useful data.

And half of the EAGLE is opened.

20:50 EAGLE closed.

Run 27 with single gamma trigger

Plunger feedback system is not conected.

Data

Position = 522.6

Supposed = 520

Plunger run = 32

Micrometer = 525.3

Run Data = /onlineNEDA_00/xData/currentRun/needleRU_i27_0027_0011.caendat

RU = 5.58 Mb/s

LF = 3.72 Mb/s

Support of Target = 1.5 mg/cm2 Ta
Target            = 1.0 mg/cm2 Cd-106
Stopper           = 10 mg/cm2 Au
Beam Dump         = ~60 mg/cm2 Au

https://docs.google.com/spreadsheets/d/1e2homI9RCYrg369z8aaY3VMIPgapUPOv0zKISsl58vQ/edit?usp=sharing

The data from google sheet obtained 14:17 07/03/23

Plunger Run :

Micrometer :

Supposed Distance:

Position :

Run 23 Stopped due to some unexpected spikes in the

voltage of collimator.

The plunger did not responde to change distance.

The chamber was opened and observed some yellow spots

seen over the Cd target.

Run 24 has been started but no beams at the moment.

EAGLE is opened.

Just colecting background.

Run 26 Started

Beam 9 enA on the collimator