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Carleton/Montreal/Victoria

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1 Carleton/Montreal/Victoria
LC TPC Groups Aachen Berkeley Carleton/Montreal/Victoria DESY/Hamburg Karlsruhe Cracow MIT MPI-Munich NIKHEF Novosibirsk Orsay/Saclay Rostock St. Petersburg 20/09/2018 LC TPC DESY PRC

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4 A DECADE OF TRACKING STUDIES
HISTORY A DECADE OF TRACKING STUDIES 1992: First discussions on detectors in Garmisch-Partenkirschen (LC92). Silicon? Gas? : TESLA Conceptual Design Report. Large wire TPC, 0.7Mchan. 2000: TESLA Technical Design Report. Micropattern (GEM, Micromegas) as a baseline, 1.5Mchan. 5/2001: Kick-off of detector R&Ds 11/2001: DESY PRC for the TPC (includes north-American teams) 5/2003: interim report DRAFT – Recommendations of the 52nd Meeting of the PRC DESY 25-26th October 2001 PRC R&D-01/03: LC TPC R&D The PRC recommends the approval of the proposed R&D programme. It encourages the collaboration to perform in high magnetic fields tests of the different end-plate geometries (GEM, MICROMEGAS and standard wire chambers) and to use the performance of the ALEPH TPC as bench mark for a TESLA detector. It asks for a status report in one year. 20/09/2018 LC TPC DESY PRC

5 Goal Time Projection Chamber
To design and build an ultra-high performance Time Projection Chamber …as central tracker for the LC detector …where excellent vertex, momentum and jet energy precision are wanted… 20/09/2018 LC TPC DESY PRC

6 20/09/2018 LC TPC DESY PRC

7 The basic idea… Cost-effective way of instrumenting a large volume
With continuous tracking and a minimum of material Want the largest possible granularity -- i.e. ~ voxels -- the best possible σpoint resolution -- the best possible 2-track resolution 20/09/2018 LC TPC DESY PRC

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9 Why… High granularity to ensure robust operation in presence of large backgrounds Continuous tracking to ensure good momentum-measuring precision and >98% pattern-recognition eff. in jets 20/09/2018 LC TPC DESY PRC

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15 Steering committee—1 representative + alternate per country:
General Happenings… Steering committee—1 representative + alternate per country: Alexei Buzulutskov Madhu Dixit, Dean Karlen Mike Ronan, Ulrich Becker Paul Colas. Vincent Lepeltier Elzbetha Rulikowska Joachim Mnich, Stefan Roth Jan Timmermans RS Video, VRVS and/or phone TPC R&D meetings about every 6-8 weeks Task-sharing among groups, e.g. --LBNL providing Star electronics for Canadian, French, German labs --MPI providing Aleph electronics --Desy 5T magnet to be used by ~5 Canadian and German groups --Saclay 2T magnet to be used by North American and French groups --MicroMEGAS work by Canadian, French and US groups --GEM progects by Canadian, German, Russian and US groups --Fieldcage studies started in Russia and Germany --Electronics work in Canada, Germany, Holland 20/09/2018 LC TPC DESY PRC

16 LBNL: STAR readout-electronics test benchs for Canada, France, Germany
VME processor Pulse generator Optical link Mother board Front end cards 20/09/2018 LC TPC DESY PRC

17 A few more examples of activities
First, without B-field Then, with B-field (more complete list in our upcoming LC Note) 20/09/2018 LC TPC DESY PRC

18 GEM and Micromegas Very
GEM: Two copper perforated foils separated by an insulator The multiplication takes place in the holes. Usually used in 2 or 3 stages Micromegas : a micromesh sustained by mm - high insulating pillars. The multiplication takes place between the anode and the mesh One stage Very 200 mm 20/09/2018 LC TPC DESY PRC

19 GEM and Micromegas S1/S2 ~ Eamplif / Edrift S1 S2 20/09/2018
LC TPC DESY PRC

20 SOME GOALS OF THE STUDY Assess the new technologies
Choose a gas Understand the electron transparency, extraction efficiency, ion feedback Check that micropattern detectors keep their good properties in a magnetic field Study dE/dx resolution Obtain optimal position resolution Get in touch with industry for detector manufacturing (thinner frames, grids) Or improve the wire chamber technology Orsay: Small-gap, Asymmetric wire chamber Munich: wire/Gem/Micromegas chamber for measurements in 5T Desy magnet wt >20 -> potential transverse diffusion less than 200 mm at 1m 20/09/2018 LC TPC DESY PRC

21 Ar CF4 Drift properties: attachment is negligible below 400 V/cm and above 15 kV/cm (supported by Saclay/Orsay measurements) 20/09/2018 LC TPC DESY PRC

22 DESY/Hamburg large Gem prototype (B=0)
20/09/2018 LC TPC DESY PRC

23 DESY/Hamburg 20/09/2018 LC TPC DESY PRC

24 Double GEM TPC Cosmic Ray Tests Carleton/Victoria/Montreal
15 cm drift (no B field) Aleph TPC preamps + Montreal 200 MHz FADCs Pads can share track charge due to transverse diffusion Ar CO2(90:10), small T ~ 200 mm / cm P10 Ar CH4(90:10), large T ~ 500 mm / cm Compute pad centroids, measure resolution for different width pads 20/09/2018 LC TPC DESY PRC

25 Resolution vs Drift Distance for Different Pad Widths. |φ| < 0. 1
Resolution vs Drift Distance for Different Pad Widths |φ| < 0.1 Carleton/Victoria/Montreal P10 Ar CO2 3 mm x 5 mm pads 2 mm x 6 mm pads 3 mm x 5 mm pads 2 mm x 6 mm pads cm cm 20/09/2018 LC TPC DESY PRC

26 First Cosmic Signals observed with STAR electronic Victoria
20/09/2018 LC TPC DESY PRC

27 Spatial Resolution in a GEM with Resistive Anodes (1
Spatial Resolution in a GEM with Resistive Anodes (1.5 mm x 7 cm readout strips, 50 µm collimated 4.5 keV x rays) Carleton/Montreal Spatial resolution Position residuals 20/09/2018 LC TPC DESY PRC

28 Resistive anode/readout same as GEM Micromesh on frame made by CERN
Observe Charge Dispersion Pulses in a Resistive Anode µMegas Carleton/Orsay/Saclay Signals on 2.5x70 mm2 readout strips (55Fe Ionization spot ~ 700 µm centred on strip 3) Resistive anode/readout same as GEM Micromesh on frame made by CERN For P10 (argon), optimum gap ~ 30 µm 20/09/2018 LC TPC DESY PRC

29 TPC cosmic tests at Karlsruhe
Cosmic ray setup using STAR electronics Measured resolution 124 mm, S/N = 18:1 20/09/2018 LC TPC DESY PRC J. Kaminski

30 Novosibirsk: Russian GEM manufacturing company in Nijni Novgorod
(80 mm holes at a 140 mm pitch) Possibility of gating the 1st GEM by pulsing the HV on it. 20/09/2018 LC TPC DESY PRC

31 Aachen-DESY-Hamburg-Rostock Nikhef
Silicon pixels for a digital readout. See individual electrons to reconstruct cluster by cluster. First need a GEM or a Micromegas to multiply each electron by 104 Medipix chip under study in Nikhef (Harry Van der Graaf, Jan Timmermans) First results very soon? MAY BE THE FUTURE Orsay-Saclay Tests have been performed in a magnetic field Cosmic setup under construction with Berkeley Collaboration began with Canada for resolution improvement studies 20/09/2018 LC TPC DESY PRC

32 MediPix 2 pixel (Jan Visschers et al)
NIKHEF MediPix 2 pixel (Jan Visschers et al) Cathode foil Drift Space GEM foils base plate MediPix 2 20/09/2018 LC TPC DESY PRC

33 Due to the high value of wt and the low grid transparency, does it work in a magnetic field? -> Simulations in Aachen (next slide) 20/09/2018 LC TPC DESY PRC

34 Simulations (Aachen)…
20/09/2018 LC TPC DESY PRC

35 A low cost DAQ card for detector R&D applications is
Readout Electronics : A low cost DAQ card for detector R&D applications is developed at Université de Montréal for the KOPIO collaboration: Prototype version has VME interface 48 channels per card Based on 40 MS/sec 10 bit ADC Estimated fabrication cost for the VME prototypes is about 55 Euros/channel. 300 MBauds serial interface RJ45 LVDS lines (4) Differential amplifier Low pass filter I n p u t c o e v r (48 pairs) 1 8 channels 40 MS/sec 10 bit FADC ALTERA Cyclone FPGA 1 Trigger Differential amplifier Low pass filter 2 Cable from preamps Event collector, VME interface . . . . 8 channel 40 MS/sec 10 bit FADC ALTERA Cyclone FPGA 6 Synchro Differential amplifier Low pass filter 48 20/09/2018 LC TPC DESY PRC System clock J. P. Martin

36 Aachen : small GEM device for current measurements 2T magnet in Julich
5T magnet in DESY (Orsay-Saclay : 1cm and 15cm micromegas TPCs for current measurements 2T magnet in Saclay TPC studies in the Saclay magnet (June 2002, Feb 2003) 2Tesla, 53cm bore diameter 20/09/2018 LC TPC DESY PRC

37 MPI-Munich prototype for Wires, Gem or Micromegas test in 5T magnet (wire version -› almost ready…)
20/09/2018 LC TPC DESY PRC

38 Both will make use of the STAR electronics
Karlsruhe/CERN ––› designed to fit in the DESY 5T magnet (Gem) Berkeley/Orsay/Saclay to fit in Saclay 2T magnet (µmegas) Both will make use of the STAR electronics 20/09/2018 LC TPC DESY PRC

39 Berkeley-Orsay-Saclay TPC under construction
1024 pads Berkeley-Orsay-Saclay TPC under construction Pad layout Field cage Detector Readout 20/09/2018 LC TPC DESY PRC

40 30 cm drift, 22 cm O.D. , 256 readout pads (60 mm  10 mm)
A Newly Operational GEM TPC Designed for B Field Tests Victoria 30 cm drift, 22 cm O.D. , 256 readout pads (60 mm  10 mm) Signals read out with STAR electronics Plans for magnetic field tests 1 T at TRIUMF & 5T at DESY Also lots of simulation-work on measuring prec. w/ MPGDs 20/09/2018 LC TPC DESY PRC

41 20/09/2018 LC TPC DESY PRC

42 Orsay-Saclay: no change observed
in the iron 55 peak position beween 0 and 2T 20/09/2018 LC TPC DESY PRC

43 The ion feedback is well understood for micromegas
No deterioration of the ion feedback (rather a small improvement) for Gems ––› The ion feedback is well understood for micromegas 20/09/2018 LC TPC DESY PRC

44 Other activities: Lorentz-angle meas., Gas studies,
Gem resolution/manufacturing at MIT Gas studies at Cracow Work on TPC field cage starting at Desy (prototyping) St. Petersburg (field simulations) 20/09/2018 LC TPC DESY PRC A. Krivchitch

45 TPC-related work outside our collaboration…
-- BNL -- Chicago/Perdue/3M -- Chicago/Perdue -- Cornell (UCLC) -- MIT (LCRD) -- Temple/Wayne State (UCLC) -- Yale ◊ see Madhu Dixit’s NA Gaseous-Tracking talk at our world LC tracking meeting at the Amsterdam Ecfa/Desy workshop: -- Asia ◊ see Norair Khlatyan’s Asian Gaseous-Tracking talk at same meeting 20/09/2018 LC TPC DESY PRC

46 Mike Ronan 20/09/2018 LC TPC DESY PRC

47 Milestone exercise Prove MPGD perf. in B-field 2004
Iterate design electronics, fieldcage, mechanics “Large” MPGD TPC prototype design Large prototype testing Final design all components 4 years for construction Commission TPC alone Install in LC detector Commission detector 20/09/2018 LC TPC DESY PRC

48 The bottom line 07.05.03 A good start, lots of action, but
…need more experience under our belts to be able to choose the technology, gas, etc Work on fieldcage, electronics, mechanics in its infancy We can make good use of the extra time for state-of-the-art improvements Testbeams will be needed in ~ 1 year 20/09/2018 LC TPC DESY PRC

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