Run 27 stopped

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_0043.caendat

RU = 6.25 Mb/s

LF = 4.06 Mb/s

09:15 beam stopped. data saved

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).

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_0038.caendat

RU = 4.48 Mb/s

LF = 4.07 Mb/s

Nothing really to report. The data rates have been fairly constant since around 4 am. Still observing the frequent sharp minima in the data rates.

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_0031.caendat

RU = 4.70 Mb/s

LF = 3.20 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.

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.

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

Offset of the plunger is 60 um.

new distcal01_vac_after_opening

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 26 Started

Beam 9 enA on the collimator

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

EAGLE is opened.

Just colecting background.

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.

Beam on the target:

target+stopper+beam dump: 25 enA   (1.7 pnA)    not stable
5 mm collimator:  0.8 enA 

data taking continued with run 0023

Operators tune beam on the target, collecting run 0023, trigger gg.

Beam energy measured:  148.2 MeV
Mind that this may be an overestimate (by ~1-2 MeV)

Plunger Run :

Micrometer :

Supposed Distance:

Position :

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

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

A list of runs, to be filled during the experiment is available here:
https://docs.google.com/spreadsheets/d/11tyI5pqYKJ-rMaYLuBIPZCClWz9Vu87W0R5AZc2srd8/edit?usp=sharing

Off set of the plunger ~60 um

Distcal file   distcal01_vac

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