open file : run063

beam: 118Te52+
energy: 10 MeV/u

purpose: data with TARGET ON, we had to stop becasue Ulli was noticing some strange effects with the target density. He needs now time to optimize that.

Detector position (Si): -24 mm

run start at 15:04 , first file: run063_0001.lmd
run stop  at 15:04:21 , last file:  run063_0xxx.lmd

_______________________________________________________________________________

time: 15:04 pm.

ON Rates
Si_X:      0 Hz
Si_Y:      0 Hz
Xray_35:   2 Hz
Xray_90:   25 Hz
Xray_145:  30 Hz
BaF_OR:     Hz

Si voltage:          60.02 V  
Si leakage current:  4.10 uA


SIS particles before:           ~2e9
ESR particles at injection:     estimated ~1e6
ESR particles after decel.:     
Target ON density:              1.52e13


copy and repeat the above (below the line) every 30 minutes

now with the MCP we can see clearly the effect of the target :) (scintillation?)
so we want to scan through the target thickness with the beam and choose the best position afterwards.

We are making 3shoots for each bumb position (we change the bumb to make the intersection between beam and target) starting at ~14:

the data will be saved at the lxg1299 data.local2/hillenbrand/Laszlo folder

previous position of the beam at target was -3mm (for the night position)
max. intensity position of the beam at target 1s -1mm. --> now it is set to this position

now Ulli also increasing the density of the jet. Right now Ulli is warming the noozle. --> takes 1hour roughly.
Earlier: 1.4E13
Now: 

Yuri puts back the scraper (Egelhof 1 - GE01DD1IG) into position = +19. (where it was in the evening)

Ulli and Nikos managed to set the target density to ~7E13  at 51K temperature

The cycle is checked again, it seems fine.

1672. MCP file was  (recoils) was not closed when we refilled the Xrays and did the cable change of 90 and 145 xrays
These stored in lxg1299 local disk

Quoting Yury:
"The count rate is very low. We estimate that we store about 10^4 118Te particles at 10 AMeV. This is a very low number.
On Saturday we re-implemented the recoil setup (MCP from Pierre-Michelle) from the previous experiment and could verify the overlap between the stored beam and the gas-jet.
In the evening the intensity has been optimized and we are running presently with stable 1.5-2 10^9 particles extracted from the SIS. Indeed, another factor 2-3 would be great.
We had to work on the gas-jet target density which significantly dropped."
Yesterday evening we started with gas jet-denisity  of ~7E13 which dropped during night to ~2E13. 

We have overall on the targetON Si position histo 57 counts. Form these I estimated based on the 124Xe measurement like very roughly 21% Rutherford, 63% pn, and 6% pg counts. For the number of pg this would mean 3.4counts, I can see now like 2 (bin (6,6) and bin (6,7))

To only good news that the scraper seems to work, althought the 2 bins at (6,12) and (6,15) I don't understand now.

Also we can see some tiny peaks in the Xray spectra. The tininess can be explained due to the low number of ions in the ESR.

I made a backup for the MCP data on my own GSI laptop. Looking for better solution...
the original "fresh" files stored at litv-exp@lxg1299:/data.local2/hillenbrand/Laszlo/

after like 20min run, the density of the gasjet already dropped from 10^14 to 8.7*10^13. Now it seems to remain in that value

Below in arbitrary units one can see the trend of the gas jet density starting from 10^14 to 8.7*10^13

We have finished the measurement with the fragments.

Now Yury will setup up a primary beam through the FRS, but without target in FRS.
We are hoping for increased intensity and stable gas target.
The plan is to make a measurement with and without the scraper in order to see the effect of scraping the Rutherford scattering.

We got 30 counts out of this afternoon 118Te run on our Si TargetON histo.
That 1 count at bin (6,10) I dont understand.

Now i can see peaks both at the 35 and 90 angle Xray spectra but not much on the 145 one.
At the end the target density stayed at 8.6E13.

there was a drop again from 8.6e13 to 7e13 in the target density

DSSSD was moved out (HV switched off)
also the scraper was mistakenly moved.

Now we move everything back to its original position

We leave the scraper still in the "scraping position" in order to collect more data.
Soon we should switch to "without sctraper mode"

run096 is stopped

this one is garbage

run101 is stopped

Detector: 90
Source: Am241 
Distance: 167.5mm
Start time: 15:46:49 23.03.2020
Stop time:  

file name: run105_xxxx.lmd
avrg. rate: 610Hz
dead-time:  7.5%

suspiciously not Gaussian shaped peaks --> investigation with oscilloscope