1 / 12

  e  Drift Chambers

  e  Drift Chambers. • Charge Division Test Chamber • Testsetup for Cosmics • Chamber Construction • Next Steps. Charge Division Test Chamber. • 1 m long wire, simple construction, He / C 2 H 6 (50 / 50) • wire read out on both sides

taggartt
Download Presentation

  e  Drift Chambers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1.   e  Drift Chambers • Charge Division Test Chamber • Testsetup for Cosmics • Chamber Construction • Next Steps Malte Hildebrandt, PSI MEG - Review Meeting 03.02.2003 / 1

  2. Charge Division Test Chamber • 1 m long wire, simple construction, He/C2H6 (50/50) • wire read out on both sides • improved adaption of preamplifier and print (impedance) to suppress reflections • Sr90 source at different positions examples of charge division (see: Progress Report Dec.2002) Malte Hildebrandt, PSI MEG - Review Meeting 03.02.2003 / 2

  3. Charge Division - Results promissing results: • individual electron clusters visible • resolution with charge division: =1.5 cm (steel wire, even with 1900 V) • 2300 V: signal/noise increases by factor 4 • resolution with steel wire (1200 /m) ~3.3 times better compared to tungsten wire (330 /m) • measured difference in transit times of the signals along wire: < 1 ns • development of waveform analyses (baseline substraction, find “t0“, …) • possibility to compare with simulations (pulse shape, transition along wire) Malte Hildebrandt, PSI MEG - Review Meeting 03.02.2003 / 3

  4. Testsetup for Cosmics - 1 • 4 prototype chambers (8 cm wires) mounted piggy-back • readout channels (oscilloscopes, FADC, ADC): chamber 1: 2 anodes, 4 cathodes from the same anode chamber 2: 2 anodes, 1 anode on both sides, 4 cathodes from the same anode chamber 3: 2 anodes, 4 cathodes from the same anode (chamber 4: no HV, 2 cathodes) + 4-8 channels (e.g. track identification, different timing) • coincidence from 3 scintillators • original cable length • setup fits to magnet Malte Hildebrandt, PSI MEG - Review Meeting 03.02.2003 / 4

  5. Testsetup for Cosmics - 2 Malte Hildebrandt, PSI MEG - Review Meeting 03.02.2003 / 5

  6. Testsetup for Cosmics - 3 Malte Hildebrandt, PSI MEG - Review Meeting 03.02.2003 / 6

  7. Measurements with Cosmics testsetup allows detailed studies of: • spatial resolution (less multiple scattering than with Sr90) • resolve period of cathode shape  optimize cathode layout • gas • magnet field • optimize preamplifier • noise and matching • adapt bandwidth • sampling frequency of Domino chip • cross talk (pure preamplifier and print cross talk less 1%) • further waveform analyses Malte Hildebrandt, PSI MEG - Review Meeting 03.02.2003 / 7

  8. Chamber Construction first full size prototypes: • frame of cathode hood • cathode support frame technical drawing of cathode hood: • cathode foil • frame of cathode hood question: how can one stretch and bend the cathode foil? Malte Hildebrandt, PSI MEG - Review Meeting 03.02.2003 / 8

  9. Construction Procedure - 1 • mount and fix cathode foil on outer part of “takeover frame” • stretch foil and fix on inner part of frame Malte Hildebrandt, PSI MEG - Review Meeting 03.02.2003 / 9

  10. step 1 step 2 step 3 Construction Procedure - 2 • bend “takeover frame” with special hinge and fold it up Malte Hildebrandt, PSI MEG - Review Meeting 03.02.2003 / 10

  11. Responsibilities Detector Group will concentrate on: • further development and construction of drift chambers • electronics optimization (together with Electronics Workshop, PSI) In future operation we will “deliver”: • with each triggersignal: list of , r, z extracted from waveform analyses Malte Hildebrandt, PSI MEG - Review Meeting 03.02.2003 / 11

  12. Summary + Next Steps drift chamber (testsetup for cosmics): • check and understand setup with Sr90 • develop software for “auto calibration” • cosmics (spatial resolution, cathode shape, gas, cross talk, …) • cosmics + Sr90: rate capability, loss of redundancy? • test in magnetic field (May 2003  user meeting 05.02.03) • waveform analyses electronics: • adaption of preamplifier (noise, bandwidth, sampling frequency) • adaption to mechanical contraints mechanics: • construction procedure • full size prototype requirement for: test of full size prototype (complete module) November 2003 Malte Hildebrandt, PSI MEG - Review Meeting 03.02.2003 / 12

More Related