Heidelberg weekly meeting

03.410 (Physikalisches Institut, Heidelberg)


Physikalisches Institut, Heidelberg


For Vidyo please use room extension 10823320 or use this link.

    • 14:00 14:45
      Round Table 45m

      Reports of work progress

      Speakers: Adrian Herkert (Physikalisches Institut, Uni Heidelberg), Alena Weber (Universität Heidelberg), Andre Schoening (University Heidelberg, Institute of Physiscs), Annie Meneses Gonzalez (PhD Student), Benjamin Weinläder (PI Heidelberg), David Maximilian Immig (Universität Heidelberg), Dohun Kim (Physikalisches Institut University of Heidelberg), Frank Meier Aeschbacher (Universität Heidelberg), Heiko Augustin (PI Uni Heidelberg), Lars Noehte (PI Heidelberg), Luigi Vigani (University of Oxford), Sebastian Dittmeier (Physikalisches Institut, Universität Heidelberg), Thomas Theodor Rudzki (Physikalisches Institut Heidelberg)

      Present: Andre, Frank (remote), Luigi, Sebatian, Heiko, David, Lars, Lukas, Benny, Annie, Dohun (remote)

      Minute-taker: Luigi


      No presentations.

      Frank: We had meeting with a professor from EPFL about Helium cooling. Very interesting. He's interested in collaborating.

      Heiko: Mupix10 design progressed. TSI replied. They accepted them, but many changes were flagged as possible sources of unreliability. Probably an usual thing they say. Fast clock: everything runs at 8ns limit. In principle no prblems if the frequency is not an integer of 125 MHz (ex 165.25 MHz and more). In principle it works until 1.65 ns. It will reduce the Sync_reset delay from 8 to 1.65 ns.

      David: woring on AtlasPix3. We see analogue output and we have stable link. Looking for better settings. Remote debugging with Mainz for MAMI.

      Benny: Talked wit Lorenzo. He said amplifier should be working well. Will look on other components: feedback tree should have a single transistor. Looking on it. 2 ways: external voltage on gate or diode connected transistor. The latter is a saturated diode: resistivity too high. First: at the edge. Resistence highly dependent on gate voltage. Not very nice. Andre: how did Lorenzo solve it? Not sure. Ivan's feedback not easy to understand/implement. Maybe just very stable voltage.

      Luigi: progress on Midas integration. Now data sending to fpga works. Firmware broken after DAQ week, once repaired gonna try in lab with full setup. Reviewing mu3epartsdb. Check change password feature, as Frank said it does not work. Seen no problem. Gotta talk with Frank.

      Lukas: Helped David.

      Lars: reproduced the physical layout of flexes in Helium to check for sparks. Set-up made in house with layers of Kapton and Aluminum glued with UHU glue. In a dessicator. No sparks. Tried to remove gluey parts. No sparks till 200 V. Frank: how much is the pressure in the dessicator? No way to measure. Frank: if the pressure is more than few tens of mbar, dangerous. Andre: would be nice to see at which voltage we have sparks. Change power supplies from Keithley. Change also geometry. More exciting.

      Annie: shows a screenshot. Done simulation of small fill factor CMOS. 200 Ohmcm substrate. No full depletion before breakdown. It was possible for 1 kOhmcm. Simulated also a shallow n-well with a shallow p-well, better depletion. It was a request from Ivan. Andre: we learnt from TJ fiasco that the 3D distribution doesn't cover the corners. Gotta do 3D. But intersting.

      Sebastian: cooling of fpga board showed good results, but electronics workshop wants a better setup. 2 ways: with pipe integration, or cooling plate with heat pipe. Gotta test which is the best. Hopefully in the next days. Mechanical workshop was quick so far.

      Andre: testbeam approaching. David needs more time with AtlasPix3. How about the software? Heiko: we are on it. Looking at errors on board, documentation,... We see signals, working on stabilizing the data links. Hopefully before tomorrow data out. Thing is progressing, we will see. Detailed plans for next week.

      Extra business: Lars: visiting friend with microscope next week. Will bring flexprints. Gonna take multiple pictures with stitching. Jan: bring flexprint and check if they are thinner that design.

    • 14:45 14:55