IMS Scientific Meeting
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Europe/Berlin
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1:00 PM
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1:40 PM
General Discussion and Technology¶
Technologie
- IDA3:
- 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
- IDA3:
- 1:40 PM → 2:40 PM
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2:40 PM
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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
- Jodok: JJs of last batch didn't work
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1:00 PM
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1:40 PM