All the beam settings will be given in a separate post.

We have 238U92+ centered in the ring with typically a few times 10⁷ ions.

SA_SZ (GE02DD2_G): Voltage 1200 V, Recomnied peak was scraped at about -50 mm, set the detector position to -25 mm 
We see very clean signals with amplitude 1,5V (Foto will follow). Threshhold: CFD "25" arb. units. count rate 8kHz - 10 kHz
Rise time 6ns (with all the cables).

NA_SZ (GE01DD2AG): No signals - cables in the ESR need to be checked

NI_SZ (GE01DD2IG): Can not be positioned, error from Control system: "Auftr. Stattus position set value out of range", Drive can however be positioned to the "Endlage innen" and "Endlage außen".

The Test above were with a DC beam. With a bunched beam we more rapidly loose the ions with the particle detector.

ESR cooler crashed. We could not restart the cooler. Since we had several other problems, we stop now.

All pressuzied air drives are tested now and are working properly

We do two measurements:

One measurement using the 

MArkus and Bernd have setup the ESR with the thick stripper foil and put the ion beam (238U92+) on the central orbit.

SIS Energy is 536 MeV/u
ESR cooler is 207.1keV (according to the multimeter in the HKR)
Bunching frequency is 3.89329 MHz
Scrapers in event mode are working.
We are now taking a Schotty spectrum with the NTCAP DAQ
(IQ_2022-04-02-15-52-58 )-The lines are not yet positioned on the Schottky resonance.
center 243.4MHz, 10MIQs, -25dBm

The ring SIS/ESR were set up for 229/89+. Pölease note that this not only 1e- Th but ponteially also the isobars of Ac (0e-1)/Pa(2e-, strongest) and U(3e-).
SIS eenrgy plus 3.5 MeV/u w.r.t. to the 238U92+ settings. We nearly don't see any of the primary beam in the ring
Cooling energy is 208998 KeV (read from the ESR multimeter).
The positioning of the scrapers is automatized but needs to be checked again tomorrow.
In order to allow for a longer measurment time, the electron curent is 500mA only during injection but is decreased to 100mA during measurement (=> longer beam lifetime).

 
 

Ken tested the Cu-mirror and CsI disk Detector. They move without a problem and don't scrape the ion beam.

As of Yuris post in the elog the positions (Info from H. Weick):

The postion of the particle counter behind the cooler is 21.6 m behind the middle of the cooler.
This correspond to 21.6m /108,4m = 1 / 5.02 of a full revolution (please check the present revolution frequency, i.e. for 2MHz, i.e. 500ns we have the signal approx 100ns after the ion is in the middle of the cooler).
If the detecot Nord would be used for bunch timing (only planned if detctor south is defect) the distance  is half a ring + 21.4m, beind the center  of the cooler, i.e. (54.2m+21.6m)/108.4m ~ 0.7

Since we cannot write on lustre, as a temproal solution two RAID 1 (mirror) USB hard disks  with cpacity 6 TB each are installed.
The disk on the lxg1297 the disk can be accessd at /meida/sdd2
an on the lxg0155 at /media/sdc2
Regular backups should be written to these disks but NOT during data taking.

If we run out of local disk space /data.localx on the machines they could also be used as target for mbs.

Pleae check regularly if there is enough spance on the local disks.

Up to now the signals for 
Ion Current
Cooler elctron current
Cooler voltage (frequency)
were not connected to the DAQs et al.

Cables in the "rded corner", i.e. where their original soruce is were not connected !!!

The ESR was retuned this aftenoon since the it was unclear if we still sit the 229Th89+ line.
This lead to new ring settings (data with all the settings will be put in tomorrow).

Thhe ESR had to leave at around 1900 so we did not find the time for finetuning and adjustments of the bunching.

Yet, we performed the particle identification with:
- (1) Energy of the SIS in the maximum of 238U92+ (534MeV/u) but ring settings Brho etc. and Cooler voltage already for 229Th89+ (+1937 kV compared to optimal settings for 238U92+) (Ucool according to "green" voltage measurement in Messhütte) 
- (2) Energy of SIS +3.5 MeV/u (maximiun of 229/89+ production), ESR with identical settings as for te ID run.



In setting (1) the priary beam is still in the ring aceptance and can be used as a unique identifier, but it is cooled very slowly.

In the measurement we typicall have 500mA at injection (fast cooling) and 100 mA for the measurement (lon glifetime of beam), but for the particle ID we also used 500MA in order toaccelerate cooling.
The ion beam slowlly grows as the ions are cooled in and gets the strongest line but also fades out much faster than the other peakks during a much higher recombination (=capture of cooler electron) than the 229Th89+. (Empty K-shell comared to 1e- in K-shell => factor of 2 recombination in cooler).

Frequencies (stopped in machine 5):

242.047 MHz (238U92+, @ 500mA) in machine #5
242.277 MHz (229/89+, @ 500mA) in machine #5
minus 4.65kHz for 100mA ecurrent

Voltage settings for cooler:
Sc3 (500mA, 209794V)
SC5,7 (100mA, 209750.06V)

Settings:
Center: 2242.5MHz
RefLevel: -25dB
Rate 15 MIQs

File Numbers: 2022_04_05 23-46-22

Please note that the file started one minute earlier had wrong settings.

File contains also injection, paused in machine #5: ramped to central orbit / not yet bunched.
The measurement does not represent the later settings since here hte 229Th89+ is still on a too inner orbit (cf. previous post).

The beam settings can also be found in the previous post.

Changed GTEDSAH Rechts to 10mm

Please check the attached files,

and correct or enhance them.

Print out a copy