1 / 15

TAU - status

TAU - status. August 17. Status. Large panel (VP1) is working and producing fast clean signals. With 1, 2 or 4 HV channels signals look and behave exactly the same. First measurements of response to radiation – both electrons and muons.

beau
Download Presentation

TAU - status

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. TAU - status August 17

  2. Status • Large panel (VP1) is working and producing fast clean signals. • With 1, 2 or 4 HV channels signals look and behave exactly the same. • First measurements of response to radiation – both electrons and muons. • Small panel (BN01) was tested and found to hold vacuum, should be tested for signals tomorrow.

  3. Our hodoscope • Roughly 2.5 cm2 of active area. • Overnight measurement of 13hours beneath the panel give 1509 cosmic triggers • This corresponds to ~2muons per minute

  4. Signal shape study (VP1) set-up • Quench resistors: 20 Mohm (per line) • 4 RO lines: voltage divider (100:1 Ohm) • MDT gas (Ar-CO2 93%-7%) 600 Torr • RO lines connected to scope 1 Ohm Ni – RO line 100 Ohm For each RO line

  5. 1 HV line

  6. 2 HV line

  7. 4 HV line

  8. Efficiency tests Set-up Source Panel Hodoscope AND between the scintillators OR between the RO lines AND counter counter counter • Quench resistors: 20 Mohm(per line) • 4 RO lines: voltage divider (100:1 Ohm) • Every RO line into discriminator -> logic

  9. First attempt – Voltage scan, MDT gas @600Torr • More triggers as Voltage rises!!! • -> BAD grounding

  10. Adjustments • Every ground in the system was connected to the other grounds with a thick wire. • Coincidents between panel & trigger almost stopped • We raised the voltage without improvement • White discoloration of the active pixels is visible. • Gas was changed to the same gas type and pressure. • New working area in the panel. • Hodoscope was raised closer to the panel

  11. Second attempt – Voltage scan, MDT gas @600Torr • Trigger is constant regardless to panel Voltage • Almost no coincident between trigger and signal

  12. Background • Without the source sitting on the panel there is almost no background. • No coincident between signal and the trigger At all

  13. Efficiency tests Set-up 2 Source Panel Hodoscope AND between the scintillators OR between the RO lines AND counter counter counter • Quench resistors: 20 Mohm(per line) • 4 RO lines: voltage divider (100:1 Ohm) • Every RO line into discriminator -> logic

  14. Third attempt – Voltage scan, MDT gas @600Torr • Rate of upper scintillation counter is ~15KHz • Rate of trigger is ~25 • We believe that upper scintillation pad is at it’s rate limit

  15. Plans for next week • Signal shape studies with BN01 panel • Rates study - continue with PV1, start with BN01 panel • Expand the study to CF4

More Related