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Monolithic detectors for the BGV tracker
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Europe/Zurich
Present: Heinz, Carlos, Petra, Valerio, Bernadette, James, Helene
Agenda: https://indico.cern.ch/event/949529/
BGV project presentation (BK):
- Cf. slides
- Early stage of the design, the distance gas target - first detector plane is not fixed yet (as close as possible, few cm)
- NIEL dose calculation ongoing with FLUKA; (HP) should be around 1×1015 neq/cm2
- (HP) a G4 simulation of MALTA is available
MALTA sensor details:
- Time resolution: between 2 to 5 ns
- No trigger system in the chip (events collected continuously, asynchronously), but possibility to correlate events using time stamps in FPGA system, where hit can be associated to bunches
- Price: 4 to 5 times cheaper than hybrid detectors
- Material budget: Sensor can be thinned down to 50 µm
- Pixel size 36 × 36 µm2
- Sensitive area 18.3 × 18.3 mm2
Detectors positioning possibilities, modules design:
- As close as possible to the beam pipe, which should be around 45 mm diameter
- Round beam pipe/square detectors => need for sensor overlapping
- BGV detector modules outer radius to be determined, trade off between amount of tracks caught and sensitive area (cost)
- Draw from ATLAS inner ring pixel detector modules design (single chip modules, similar inner radius)
- Or similar design than LHCb VELO:
- 2 half-rings clamped around the beam pipe, containing as many modules as the cables allow;
- Possibility to place sensors on both sides of the module with 20-30% surface overlap;
- 3 ring layers separated by 20 to 30 cm: 3 to 6 hit points per track.
- Possibility to tilt the modules to minimise the particles' path into detectors material -> might not be needed with 50 µm thick sensors.
- Could also try with 2 concentric layers of chips
MALTA chip presentation (HP):
- MALTA-Cz:
- Tested with 100 Hz/cm2 and 1015 neq/cm2
- Wafers available and also some sensors assembled
- MALTA V2:
- Should be submitted by September
- Incorporates improvements made in the past years
- Current design 10 × 20 mm2 ; could re-run with 20 × 20 mm2 (6-9 months)
- MALTA V3:
- Supported by EP department
- MALTA V2 with larger matrix
- Part of FPGA synchronisation system will be transferred to the chip
- Serial powering (limit cabling mess)
- Should be available ~ early 2022
- Substrate material choice => cluster size: hit interpolation possible
- Modules:
- Part of Petra's WP
- Possibility of merging adjacent chips data: achieved with 2 chips already, possible also with 4 chips in a row
- PhD student to start in October on a multi-MALTA module
- (PR) Try existing modules and profit from existing designs
- 1 year scale to produce a module
- Cooling:
- Possibility to etch cooling channels on MALTA sensor directly: works well (Alesandro M., EPFL); maybe not necessary for us
- Readout:
- Control via an FPGA
- MALTA chip <-> Digital back-end ASIC (data aggregator, application/experiment specific)
- PicoTDC could be interesting for us (EP-ESE) <-> VC707 <-> GBT <-> VC709
Other applications:
- R&D for electron-ion colliders
- Muon storage (PSI)
- BGV?
Readout rate:
- Sensor -> periphery max of 100-200 MHz/cm2 (chamber available for testing if needed)
- /!\ current back-end (VC707 / PicoTDC) can't handle this; need to find a back-end system able to cope with this rate
Data processing:
- 2 applications for the BGV instrument:
- Offline: detailed emittance growth studies during LHC ramp
- Online: real time beam profile monitoring => part of the reconstruction will have to be done in the FPGA (at least cluster reconstruction) to have enough zero suppression
Summary and plans:
- The sensor specifications seem to be a good fit for the BGV instrument; no showstopper identified. // The BGV would be an interesting beam monitoring application for the chip.
- BGV team: implement a simulation with a 2 × 2 cm2 tile arrangement
- Possibility to get hands on experience in build. 301 lab to try out the sensor, or take back to Prevessin
- Meet up again in mid-September (Helene will send the invitation, inviting Carlos, Valerio, Heinz, Andreas + BGV team)
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