Run stopped for detector fillings

The LN2 Dewar on the ESR roof has been refilled.

now we try to move the capture detector (MWPC in the 1. dipol before our Si setup) inside the ring while the DAQ was ON

we tried to move it as close as possible to the beam

On the picture below you can see that we had some increased current while moving the MWPC --> scattering from the beam while scraping it

12:02 pm - scapper is taken out completely 
open file : runstart061

we want to see any change on the Silicon count rate, because we will have now also Rutherford scattering. 

Target thickness must be like 5mm (was measured with a moving thin wire)
The beam thickness is small because of the low intensity
Maybe we hit the target a bit offset --> less rate?

We might have the option to increase the target 1magnitude more, but this might not help because we can kill the beam 
with this.

I have the impression we just simply have less number of stored ions like 10^4 or evem less...

Yury: "we are unsure about the settings and desperately seek for any means of additional diagnostics"

Pierre Michel and Laszlo go inside the ESR for switching on the MCP detector so that the photons from the gas jet and secondary beam interaction can be seen.

Close file: run061

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)

We are going into the ESR to check the electronics.
Use calibration sources (133Ba etc).

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

The cycle is checked again, it seems fine.

We started recording the data from the recoils using the MCP from Pierre-Michael's experiment. 
17:30 File opened: recoils1662.lmd.
data is stored at lxg1299: data.local2/hillenbrand/Laszlo

rough comparison of life time at 10 MeV/u when target off with on. more noise in background means weaker signal.

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

The intensity of beam from SIS is less due to some issues with UNILAc.

The problem at UNILAC seems to have solved itself. Intensity is returning to normal.

There is some problem with the vacuum in SIS and thus data recording is stopped.

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