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_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.

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_0043.caendat

RU = 6.25 Mb/s

LF = 4.06 Mb/s

09:15 beam stopped. data saved

run 28 started

Run 29 with single gamma trigger

Plunger feedback system is not connected.

Data

Position = 522.6

Supposed = 520

Plunger run = 32

Micrometer = 525.3

Run Data = /onlineNEDA_00/xData/hil099/run_0029_02-03-2023_10h28m22s/needleRU_i29_0029_0002.caendat

RU = 38.5 Mb/s

LF = 12.0 Mb/s

un 29 with single gamma trigger

Plunger feedback system is not connected.

Data

Position = 522.6

Supposed = 520

Plunger run = 32

Micrometer = 525.3

Run Data = /onlineNEDA_00/xData/hil099/run_0029_02-03-2023_10h28m22s/needleRU_i29_0029_0021.caendat

RU = 40.1 Mb/s

LF = 12.5 Mb/s

We will change the trigger and we stopped the run number 29

We hane now g-g trigger started.

Run 30 started

beam stop,

EAGLE is closed now

We gave a break to test the cable connection of target, degrader, beam dump and collimator.

Run 30 continues to collect data, we did not stop it.

But not much usefull data in it.

Data

Position = 522.6

Supposed = 520

Plunger run = 32

Micrometer = 525.3

Run Data = /onlineNEDA_00/xData/hil099/run_0030_02-03-2023_11h18m31s/needleRU_i30_0030_0011.caendat

RU = 3.53 Mb/s

LF = 2.40 Mb/s

Data

Position = 522.6

Supposed = 520

Plunger run = 32

Micrometer = 525.3

Run Data = /onlineNEDA_00/xData/hil099/run_0030_02-03-2023_11h18m31s/needleRU_i30_0030_0011.caendat

RU = 3.53 Mb/s

LF = 2.40 Mb/s

beam off and on and off. eagle is opened and run 30 continues

new cable is stucked

Cable test is going on

Data

Position = 522.6

Supposed = 520

Plunger run = 32

Micrometer = 525.3

Run Data = /onlineNEDA_00/xData/hil099/run_0031_02-03-2023_11h18m31s/needleRU_i30_0031_0011.caendat

RU = 3.53 Mb/s

LF = 2.40 Mb/s

cables to colimeter are checked and replaced.

Run 31 was stopped, because plunger distance is reduced to the mininimal one.
It takes time, in the meantime, after some break, run 32  was started, with no beam.

Plunger Run : 48

Supposed Distance = 10 um

position of the target = 10 um

micrometer = 6.5 um

Voltage = 7.957 V

Plunger off set 60 um

Which means we are running 60 um + 10 um (read from position window of plunger) = 70 um.
 

Run 32 Stopped

Run 33 Started

Plunger Run : 48

Supposed Distance = 10 um

position of the target = 10 um

micrometer = 6.5 um

Voltage = 7.957 V

Plunger off set 60 um

Which means we are running 60 um + 10 um (read from position window of plunger) = 70 um.

20:50   Observed beam dropped by a factor of 2 (1.5 enA on the beam dump). Asked the operator to improve beam. 

run stop 22:53 acquisition problem

Run 34 Started (33 was stopped due to acquisition problems)

Plunger Run : 105

Supposed Distance = 10 um

position of the target = 10 um

micrometer = 12.7 um

Voltage = 7.9 V

Plunger off set 60 um

Which means we are running 60 um + 10 um (read from position window of plunger) = 70 um.

at the first 10 min det # 5 was switched off

Ge det #            1         2        3          4         5        6          7          8          9           10           11          12           13         14         15

old scalers:         5        2.5      8          5         8.5     3          5         1.5        5           8.5          8.5          7.5         2.7        2.7         5      kHz

new (Grzes)        1.7     1         3.2       1.8      3.6     0.9       1.7       0.45    1.7          3.5         3.2          3.1         1.           1.          1.7    kHz

beam dump current 3nA

det # 5 scaler  7.7   kHz

stoppped 00:02 because beam current was reduced byu a factor of 2 (see note on the next run)

Notes of the measurements with different conditions are attached.

Conclusion:
What is read out by the operators on the blue cable should be multiplied by 7 to get a real value in enA.