Heidelberg weekly meeting

03.410 (Physikalisches Institut, Heidelberg)


Physikalisches Institut, Heidelberg


We will have the meeting via Zoom: https://cern.zoom.us/j/92591061032?pwd=MkZzY2g1cG1YZGFwK244c210dk44dz09

Note: this is a temporary room until we get the institute account.

We will keep HeiCONF as a backup: https://heiconf.uni-heidelberg.de/sch-nqu-dd2   Access Code: 858824

Vidyo will be used as a back-up. Room extension 10823320 or use this link.


Tentative minute taker list at https://docs.google.com/spreadsheets/d/15oo_a_1WPxPBOtlH0LDEKG1128y1O2lfswpUAvPCQOY/edit#gid=0

    • 2:00 PM 3:00 PM
    • 3:00 PM 3:45 PM
      Round Table 45m

      Reports of work progress

      Speakers: Adrian Herkert (Physikalisches Institut, Uni Heidelberg) , Adrian Stoll, Alena Weber (Universität Heidelberg) , Andre Schoening (University Heidelberg, Institute of Physics) , Annie Meneses Gonzalez (PhD Student) , Benjamin Weinläder (PI Heidelberg) , David Maximilian Immig (Universität Heidelberg) , Dohun Kim (Physikalisches Institut University of Heidelberg) , Florian Frauen, Frank Meier Aeschbacher (PSI - Paul Scherrer Institut) , Heiko Augustin (PI Uni Heidelberg) , Jakob Stricker, Lars Noehte (PI Heidelberg) , Luigi Vigani (University of Heidelberg) , Lukas Mandok (Physikalisches Institut Heidelberg) , Marius Menzel (Institute of Physics, University of Heidelberg) , Sebastian Dittmeier (Physikalisches Institut, Universität Heidelberg) , Sebastian Preuß (PI Uni Heidelberg) , Stephan Lachnit, Thomas Theodor Rudzki (Physikalisches Institut Heidelberg)


      • Presentaition: summary AmpOut measurements
        • observed problem: for different amplitudes the fall rate is not constant
          • discussion on how to fit the falling part best... define the best part of the curve for the linear fit
        • next steps: limited time, therefore only one/two more parameter scan -> suggestion VNFB or VNOut


      •  Presentation: Break down voltages/ I-V curves for plasma etched MuPix10
        • results are not promesing -> comparison to old results from Dohun -> current rises earlier
        • no low voltage was applied for the measurement


      • Presentation: Observation of plasma etched MuPix10
        • measured the backside via afm microscope
        • structures in the scale of 200nm height and 2um width was found (sensors with plasma etching)
        • Idea to remove these structures: Wet etching
          • Luigi will try to gather more informations
        • Heiko: these result point out that for thin sensors the depletion zone reaches the chip backside (compared to erarlier results which hint that there is alarge contribution of charge collection via diffusion)
          • meaning higher HV will not increase the collected charge
          • but leakage current (noise) should decrease, thermal runaway and maybe higer HV is needed to fully depled pixel corners
        • discussion: how coudl this be studied further and how it should influence MuPix11 submission
        • Idea for next steps:
          • afm image of non plasma etched sensor
          • try wet etching
          • try menual polishing/destruction of certain areas of the backside to see with uv light if the leakage current increases there

      Annie/ Dohun:

      • last week on testbeam
        • goal of testbeam: lhcb pepole get to know how to handle sensor/telescope
        • managed to take some date and do some scans
          • performance with different temp -30°C, -20°C, room temp
          • i-v curve for different temp
          • power consumption: <100mA different between  room temp and -30°
          • again lagre clusters where observerd (like at DESY and PSI), reduced at low temp


      • prepairing to include the ethernet connection to the new Telescope FEB-SCSI PCB


      • writing on his thesis
      • try to get a model for pixel and charge collection


      • first AtlasPix3.1 on PCB, will test this later the day
      • testing cooling setup with run2020 insert


      • besides the i-v curves, tries to revive the tuning algorithm


      Plans for upcoming testbeam

      • if thin sensors should be tested, they need to be cooled -> cooling setup should be done
      • Who goes there? Lot of people are in holyday
        • SiFi guys are also arround
    • 3:45 PM 3:55 PM