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

// we noticed yesterday that GE at 143 degrees counts more than those placed at 117 and 101. The 511 keV line (+ background) is much more pronounced for Ge at 143 degrees. To investigate this issue we decreased the beam intensity to 0.3 enA ( value given by operators at the beam dump ). 

Conclusion - decrease of the beam intensity does not explain above observations (se attached figs)

plunger run # 216

Beam dump 0.3 enA (given by operators) * 7 (following entry ID#39) = 2.1 enA

Collimator     enA

Run Data =/onlineNEDA_00/xData/hil099/run_0035_03-03-2023_00h04m26s/needleRU_i35_0035_0040.caendat

RU : 2.15 MB/s

LF : 5.60 MB/s

Supposed Distance = 10 um

position of the target = 10.6 um

micrometer = 8.8 um

Voltage = 7.8 V

we increased beam intensity to 1.25 enA (readout at the beam dump)

beam stop due to the beam energy measurement

The beam energy: ~145 MeV

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

run control = 49

run data = /onlineNEDA_00/xData/hil099/run_0049_08-03-2023_09h31m08s/needleRU_i49_0049_0064.caendat

RU =  5.75 MB/s

LF =   3.50 MB/s

plunger:

plunger run = 676

actual distance =  382.8 um

supposed distance = 382.7 um

micrometer =   384.9 um

position =  150.4 um

voltage =  2.146 V

Beam dump 0.7

Plunger Run :

Micrometer :

Supposed Distance:

Position :

Since we were observing jumps of 16 ns in timings of all channels of whole boards, the assumption was that the 
signals from logical FIFO arrive at different times to S-IN inputs to zero the TS counters.
6 originally placed cables of quite the same length were replaced with 6 cables of declared 3-ns length, same 
producer, borrowed from NW's equipment.

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).

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

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

/onlineNEDA_00/xData/hil099/run_0045_07-03-2023_09h14m17s/needleRU_i45_0045_0027.caendat

/onlineNEDA_00/xData/hil099/run_0045_07-03-2023_09h14m17s/needleLF_i44_0045_0010.adf

18:54 Run 58 stopped and 18:55 Run 59 started.

BEAM STOPPED.

END of EXPERIMENT.

Run 59 collects radioactivity.

-rw-rw-r-- 1 xdaq xdaq 295178920 Mar 12 18:59 needleLF_i58_0059_0000.adf
-rw-rw-r-- 1 xdaq xdaq 802293316 Mar 12 18:59 needleRU_i59_0059_0000.caendat

Run 55 Started New Distance 500 um

run control = 49

run data = /onlineNEDA_00/xData/hil099/run_0049_08-03-2023_09h31m08s/needleRU_i49_0049_0008.caendat

RU =  10.6 MB/s

LF =   4.89MB/s

plunger:

plunger run = 591

actual distance =  383.0 um

supposed distance = 382.7 um

micrometer =   385.8 um

position =  150.3 um

voltage =  2.145 V

Beam dump 0.7 nA

Counting rates continued to increase (det4 > 3kHz). Beam current looked fine on the beam dump, but beam is fluctuating, and can reach 2nA on the collimator.  Asked for improved focusing.

Attached screenshots and Ge spectra from before changing anything.

run control = 49

run data = /onlineNEDA_00/xData/hil099/run_0049_08-03-2023_09h31m08s/needleRU_i49_0049_0020.caendat

RU =  13.3 MB/s

LF =   6.15MB/s

plunger:

plunger run = 603

actual distance =  382.7 um

supposed distance = 382.7 um

micrometer =   385.9 um

position =  150.0 um

voltage =  2.146 V

Beam dump 0.7 nA

Collimator ~1.5-2nA when the generator retunes itself (prob the beam gets defocused at those moments)

run control = 49

run data = /onlineNEDA_00/xData/hil099/run_0049_08-03-2023_09h31m08s/needleRU_i49_0049_0030.caendat

RU =  7.86 MB/s

LF =   3.87 MB/s

plunger:

plunger run = 616

actual distance =  382.7 um

supposed distance = 382.7 um

micrometer =   385.7 um

position =  150.0 um

voltage =  2.147 V

Beam dump 0.7 nA

Run 48 stopped at 9:29 to start a new run.

Run 49 is started okay at 9:31.

run control = 49

run data = /onlineNEDA_00/xData/hil099/run_0048_08-03-2023_01h08m57s/needleRU_i48_0048_0041.caendat

RU =  10.1 MB/s

LF =   4.68MB/s

plunger:

plunger run = 582

actual distance =  383.1 um

supposed distance = 382.7 um

micrometer =   385.8 um

position =  150.5 um

voltage =  2.145 V

Beam dump 0.7 nA

run control = 48

run data =  /onlineNEDA_00/xData/hil099/run_0048_08-03-2023_01h08m57s/needleRU_i48_0048_0017.caendat

RU =  5.75 MB/s

LF =   3.21 MB/s

plunger:

plunger run = 530

actual distance =  382,7 um

supposed distance = 382.7 um

micrometer =   384.3 um

position =  150.3 um

voltage =  2.146 V

Beam dump =  1.5 nA

Collimater=  0.7 nA (?)