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AMBER PRM Weekly

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AMBER PRM Weekly
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Zoom Meeting ID
93355483738
Host
Christian Dreisbach
Alternative hosts
Aleksei Dziuba, Jan Friedrich, Thomas Poschl
Passcode
03122020
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List of identified participants:

Jan Friedrich, Aleksei Dziuba,  Christian Dreisbach, Martin Hoffmann, Horst Fisher, Alexey Vorobyov, Alain Magnon, Alexander Inglessi, Jan Bernauer, Benjamin Moritz Veit, Carlos Azevedo, Eva-Maria Kabus, Fulvio Tessarotto, George Smirnov, Igor Konorov, Jens Barth, Maxim Alexeev, Martin Losekamm, martin Zemko, Michael Pesek, Oleg Kiselev, Stefano Levorato, Oleg Denisov, Thomas Poeschl, Eugeny Maev

 

14:00 → 14:20  Communications / Organizational matters
Speakers: Aleksei Dziuba (NRC Kurchatov Institute PNPI (RU)) , Jan Friedrich (Technische Universitaet Muenchen (DE))

Aleksei Dziuba (AD):
 - Minutes of previous meeting are attached
 - If one have ideas about AMBER logo (in words or in a simple sketch), please, send them to Jan and Eva-Maria

Jan:
 - Important news (not official, but Stefano can confirm) is that a schedule for North experimental area of SPS is prepared
 - It shows PRM pilot run to be scheduled in October (weeks 40-41, 4th of October)
 
Oleg Denisov (OD):
 - This is a decision by committee we can negotiate (?)
 - NA63 has two weeks after PRM-pilot, but there are some chances that they can be not ready and skip
 
Jan: Surprisingly, we have no reply from referees
OD/Fulvio:
 - Nothing for COMPASS
 - It's clear that MuonE is out
 
OD:
 - Final schedule will be fixed in June
 - October seems perfectly fine for us
 
Alexe Vorobyov (AAV): For TPC October is better, as there will be  time for a gas purification with the equipment from PSI

Oleg Kiselev (OK) / Horst: For ALPIDEs October is better than September

Discussion about the chances that NA64 will skip. The outcome: the probability they will skip is low.


14:20 → 14:50 Comparison of two simulation programs
Speakers: Aleksei Dziuba (NRC Kurchatov Institute PNPI (RU)) , Martin Kurt Hoffmann (University of Bonn (DE))

AD: On ACTAF figure. The 5 bar line from Martin's calculation should be shifted a bit down to fit 1st point. Agreement will be even better.

AAV to Martin: Is it a full flux or at one anode?
Martin: Due to the size of the MAMI beam the total flux is on the central pad.

AAV to AD: Which shaping did you use:
AD: 1.4us one. For the ACTAF caculation a grid-anode drift wasn't accounted in my simulation, but this shouldn't affect result dramatically

AAV: We should decide which shaping to use
AD: Shorter shaping is possible, but we need input data for the electronic noise.

Eugeny to AD: Please, update your studies for 20 bars. We still don't understand the frequency dependence of the noise linear or square root.

 

14:50 → 15:10 Tracking for the pilot-run
Speaker: Aleksei Dziuba (NRC Kurchatov Institute PNPI (RU))

Moritz:
 - An additional detectors could be two segmented (7 segments of 5 cm) upstream and downstream scintillators
 - ALPIDEs can be triggered externally but could provide a time information with 5-10us precision

AAV: What is the solution for pilot run tracking?
Jan: Carrier board but there are problems with license and manpower (here group of Horst can contribute)
Horst: To clarify, I said, "I will look into it". There is no guarantee that the Frieburg group covers it!

AAV: SciFi for the pilot-run?
Jan: One XY station
AD: If ready and will be in the same readout chain, then this station will helps a lot

AAV: How the absolute precision of the angular (and thus Q2) measurements can be guaranteed?
Jan:
 - According to our COMPASS experience a straight muon track allows us to make a perfect calibration.
 - We should controle a time dependence
OK: Vendor claims a 1um overall precision in sensor, but what will be the precision of the sensor positioning? perhaps 10um?
Jan: We reached in the past 0.1um precision (but on average!).
AAV: Not a trivial task
Jan: Fully agree

Jan: Can Karl or Christian comment on a tracking?
Christian: We concentrated on timing, but can have a look.

Moritz: Maybe we should turn to a mosaic option but with overlaps.

OK: Is individual alignment with a um precision possible.
Maxim: 100um easy reachable, but beyond that we have to develop some tools.

 

15:10 → 16:00 AoB

IKAR TPC status

OK:
 - High pressure valve was delivered today
 - Adopters are ready
 - I start to check components and documentation
 - If it's fine, I'll send it to CERN in the beginning of next week.

Eugeny:
 - That's important step for the new vacuum system
 - Plan to mount endcups to the end of this week (1st one is already mounted)
 - For this a special supports were produced
 - In a week or two a pressure and vacuum tests
 - Next step is the inner structure
 - We should make a decision about construction of the electric field shaping rings. There are some tension between ANSYS (GSI) and COMSOL (PNPI) calculations.
 - A connectors for inner part should be chosen as well
 - IKAR to be fully ready in September
 - 2-3 weeks of gas cleaning in the second part of September.


Main TPC body

OK: There is a reminder from the company about the main TPC body. They wait for updated drawings. Is this work in progress?

Eugeny: A group of Alexander Vassiliev is working on it, but there is no news from their side. Maybe, we have to discuss it in a small meeting.

OK: I plan a meeting with a company at the middle of next week and need inputs.


ALIPDEs

Maxim:
 - We ordered (?) a PCB from ALPIDE to try to put in into a fast readout mode (expect to have it this in CERN)
 - work on tooling is in progress
 - we want to populate one PCb with components to check that it works.

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