Part: Adrián, Taikan, Yu, Vincent.

Commissioning Paper to be submitted to NIM [@Adrian]

A possible additional plot to illustrate uniformity of boards:

Ped-⟨Ped⟩_ASIC should remove the ASIC dispersion (compensated by global thr.)
and show only internal dispersion (not corrected (SK2) or to be adjusted (SK2a)).

Bandgap measurement

Jérôme has measured the BandGap on the long slab SK2 chips, and found a dispersion ~0.1V
(for nominal value of 2.5). This can partly explain the behaviour of the Long Slab response to mip (analysis by Sasha and Fred).
Measurement on SK2a ?
- Not yet (Taikan) → on test board ?
- On FEV13 by Jérôme ?

SK2a production 2019

The production of AMS035 will stop at the end of 2019.
CMS-HGCAL has requested an additional production of HGROC;
this implies a side production of SK2a.
That will be the last before we have SK3-like chips.
How many chips are needed for:
- Double Long SLab [@LLR]: 2×128+15% cont. = ~300 chips
- COB testing [@LAL] = ?
- FEV13 [@Kyushu] = ?

Data availability:

All data have been copied to EOS;
- they still need to be processed (last processing. done on lxplus).
elog is still unavailable: @Vincent: to be corrected ASAP!

Testing of FEV13 [Master thesis of Yu Miura, see slides]

4 ASU13 + 1 ASU11 (#17) in a stack → cosmics
MPV vs Si Thickness shows an intercept to a null signal at 97.2±0.8μm.
This hints at an inactive region of ~100μm.
HPK people claim it should be ~25% of the Si thickness.
Are 650μm wafers fully depleted @ 150 V ?
- Test with ⁹⁰Sr source hints at almost no difference between 150 and 250V: 1% var on the average response (maybe due to increase of leakage current?).
- Comparison of ⁵⁷Co and ¹³³Ba sources response to cosmics
  - OK for 320μm
  - difference of ~7-8% for 650μm (lesser response from sources).
    - @Yu: does this estimate includes the 100μm non-active region of wafers ?
      This should make things worse.
Possibility to test with 550μm wafers ?

BT2019-06 @ DESY:

Students

@Kyushu: Yu will defend master thesis on next week
- will still be around for paper redaction ~ 1 month ?
@LAL: Éloïse will continue for her master thesis → COB analysis
@LLR:
- Sasha continues BT analysis for his master thesis. Main topic: EM showers.
- Possible PhD student (Jonas) will be at ILD meeting @ KEK

AoB