rf-generator matching has to be done manually otherwise the matching is very unstable
the backup generator and matchbox should be tested at IDA3
the generator and matchbox currently used at IDA3 should be tested with a different sputter gun
Messtechnik
PTC:
the PTC again reaches its old basetemperatures of less than 4K
the issue was mostlikely due to contaminated Helium inside the PTC due to a leak in the pressure controller during refilling or the rotation valve frequency was incorrectly set.
the controller of the rotationary valve will be marked to be always set to "30.0"
New JJ-Dipstick:
dipstick is now operational and reaches temperatures below 3.8K
12 channels for JJ measurements + 12 channels for other dc measurements
multiple people can measure during one cooldown
everyone should enter in the PTC calendar which channels they intend to use and which channels are still free
SQUID measurements at PTC:
noise is reduced significantly when unplugging the thermometer from the dipstick "PTC-SQUID"
test whether noise is already removed when lakeshore bridge is turned off and how unplugging the thermometer inside the PTC affects the noise
does the noise improve when using the new advanced/highperformance lakeshore bridge?
Bluefors:
next time the Bluefors cryostat is opened up Sebastian wants to take a look at it
the remaining copper parts of the dc-wiring will be installed on the MXC stage for the next run
Other topics
clean up till the lab tour on 12.06.24 :
all labs must be tidied up for the lab tour
everyone should actively look for trash in the labs and offices
measurement data, laboratory journals, delivery notes, signed theses, etc. must be kept.
ask if you are unsure whether something can be thrown away
KRYO contributions:
Posters: Lena, Friedrich, Nick, (Nahuel)
Talks: Michael, Martin, Juan Ma
1:40 PM
→
2:40 PM
MMCs
etching SiO2 results in sharper edges than a lift-off (Juan Ma. shows SEM images)
how to proceed with Au:Er?
ITEP magnetometer measurement of foil or INT or Heidelberg
who takes care of data analysis/evaluation?
2:40 PM
→
3:40 PM
SQUIDs
Jodok: JJs of last batch didn't work
test at which fabrication stepp the error occured (Al or Trilayer or ...)
new batch: 80nm to much SiO2 deposited
simulations with Chang
Konstantin: critical currents of crossJJs larger by a factor of 2 than expected
more statistics required
Dennis: PTC measurement of Nb-arrays in preperation, RT-measurements are ok
Saadia: besides fabrication of magnetometer SQUIDs, think of methods to improve the shielding inside the PTC additionally to the µ-metal shielding
Mona: simulations require up to 50GB of RAM ⇒ ims13