Measurement of dE/dx in Phobos silicon detectors at the BNL AGS

The primary aim of the tests is to precisely determine the energy loss dE/dx in silicon detectors.

In this test we measured the energy loss for pions and kaons in 300um thick silicon pad detectors in a momentum range of 100MeV/c to 9GeV/c.

General Information:

• BNL proposal for this measurement to obtain beam time
• A brief presentation on the planned measurement
• Some first results right after the test with information obtained from the online monitoring
• The run log  with some select runs, giving the run number, energy and particle type
• Geometry of channels as they were connected to sensor pads in space.
• Excel file matching hybrids, strings, sensors, sensor labels,.... containing sensor thickness: match.xls

Analysis Information

• Download Phat for analysis of testbeam raw data (updated 3/24/99 HP). This version is NOT SUPPORTED and you use it at your own risk (as Patrick made it clear to me). This download is meant only for testbeam analysis. If you want to do other more general things please get latest Phat version directly.
• Download Macros to run raw signal processing and full event analysis with tracking (updated 3/24/99 HP)
• Some information and examples on the signal processing using latest Phat.
• Download all calibration data base files (sorted by calibration file name - the new version uses the measured values for the calibration capacitors) (updated 3/24/99 HP)
• How to Run the Macros
• Get a compiled root version of a convoluted Landau+Gauss fit for your signal distributions

Analysis Results

• NEW Results: Measurement of energy loss and comparison to GEANT for pions in the momentum range from 0.5 to 8GeV/c (C. Vale's presentation at the Phobos collaboration meeting as pdf or ps) covering:

  a precise measurement of the logarithmic rise of dE/dx in thin silicon

  a detail comparision of the dE/dx measurements with Geant predictions and Bethe-Bloch calculation

• NEW Results: Measurement of energy loss and energy straggling for low momentum pions and kaons (H. Pernegger's presentation at the Phobos collaboration meetng as pdf or ps) covering:

  a comparison of measured energy loss and straggling for pion and kaon with Geant and Bethe-Bloch in the momentum range of 130MeV/c to 1GeV/c

  a first test of the particle identification capability of spectrometer silicon detector with real data

• Review of results on pedestals and noise in all modules used during the Test Beam '98 run 069.
• Analysis of stability of pedestal and noise levels -
  - Summary and a Full collection of plots.
  - Results from the search for the source of the drift of pedestal levels.
• First results from the search for signals of stopping particles in low energy runs of Test Beam '98.
  - comparison of distributions of hit energies for various runs - primary energies,
  - comparison of distributions of hit energies in consecutive sensor planes.
  - effects of the 2 hot channels in plane 3

First full reconstruction of real data! This is Event #924 from Testbeam 98. The rawdata went through the zero suppression, was calibrated and mapped to the geometry of Module Type 1. All signal were  processed in Phat, which constructed hits and reconstructed a first track.

This event was fully reconstructed using the Signal Processing Frame Work for silicon detector in PHAT.

A first brief documentation for algorithms and classes used in PHAT for the signal processing is at the Phobos PHAT page

Test Beam 97

Test Beam 96

This section is maintained by Heinz Pernegger