the beam is stopped at 21:23.

the beam is now good focused

the beam comes back at 20:54

16/03/2023

Plunger chamber closed, some dummy target and stopper probably inside

run 72    eagle closed

run 73    right half of EAGLE completely opened

Three screenshots are attached:

Run 72  EAGLE closed

1)  Three rings.  There is significantly more 511 in ring 143 than in 117, 101

2) 5 detectors of ring 143. They all look similar to each other.

Run 73  right half of EAGLE opened

3) 5 detectors of ring 143.  The 3 detectors in the opened half hardly see 511 keV, the other 2 do.

Check with Colibri and a gamma scintillator probe ws done: largest activity is visible close to the target chamber, in the region starting at the edge of the chamber, end ending about 6 cm upstream.

About 80 gamma counts/s are seen there. The count rate decreases further upstream.

Background rate:  20 to 30 counts/s, 25 counts/s in Sala Fizykow.

Radioactivity line seen in the spectra,  with the same behaviour as 511:   743.5,  936 keV, 1434 keV.  These are lines from 52Cr, fed by beta+ decay of 52Mn.

Confirmed by Michain gamma-gamma.

52Mn can be produced in the a2pn channel in  the reaction 32S+27Al

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

the beam was stopped at 19:27

the beam start: 19:31

RUN CONTROL = 36

Run Data = /onlineNEDA_00/xData/hil099/run_0036_03-03-2023_16h47m35s/needleRU_i36_0036_0122.caendat

RU = 5.99

LF = 3.35

Plunger ;

Planger run = 504

Supposed Dist=10

Micrometer = 11.1

Position = 10.2

Voltage = 8.964

Beam dumb = 1 nA

Collimeter =0.7 nA

started

source in the target position, as precisely as possible

target and stopper and beam dump dismounted.
only the constructional elements of the plunger remained. 

pure background, g trigger only.

Michal says the"bg" spectrum did not change...

run control = 57

run data =/onlineNEDA_00/xData/hil099/run_0057_12-03-2023_03h10m10s/

RU = 8.1 MB/s

LF =   3.8 MB/s

plunger:

plunger run = 1484

actual distance =  262.7 um

micrometer =   266.9 um

position = 30 um

voltage =  3.306 V

Beam dump: 0.75 nA 

Colimator :  1.1 enA

stop:

run control = 56

run data =/onlineNEDA_00/xData/hil099/run_0056_11-03-2023_23h26m10s

RU = 7.3 MB/s

LF =   3.5 MB/s

plunger:

plunger run = 1445

actual distance =  262.7 um

micrometer =   266.2 um

position = 30 um

voltage =  3.05 V

Beam dump: 0.75 nA 

Colimator :  1.1 enA

stop:

run control = 55

run data = /onlineNEDA_00/xData/hil099/run_0055_11-03-2023_00h33m38s/needleRU_i55_0055_0137.caendat

RU = 4.17 MB/s

LF =   3.11 MB/s

plunger:

plunger run = 1439

actual distance =  515 um

micrometer =   578.2 um

position = 282.3 um

voltage =  1.372 V

Beam dump: 0.75 nA 

Colimator :  1.1 enA

stop: 11.15 pm -> new plunger distance

9:08 local filter turned red. Both .caendat and   LF .adf files still incrementing. Stopped run 44, started run 45, looks OK.

run 66 started, radiocativity (background)

Run 59 collected data using gg trigger radioactivty

Run 60 trigger changed fropm gg to single g.

Just in the beginning a few minutes gg data could have been collected.

run 54 - stopped due to change the distance in plunger

• Run number: 54
• Start time: Fri Mar 10 23:14:54 2023
• Stop time: Sat Mar 11 00:02:37 2023

the daq crashed at 22:43 -- problem with Local Filter

the run 53 - stopped

run 52 - stopped

• Run number: 52
• Start time: Fri Mar 10 01:19:56 2023
• Stop time: Fri Mar 10 16:16:25 2023