A1900 Electronics, Data Acquisition, and Data Analysis

The electronics setup for the standard A1900 detectors is treated as a permanent installation since it must stay ready to provide reliable A1900 support for NSCL experiments.

Most signals from the A1900 detectors are fed through two 16-channel amplifier-ADC chains. Several unused channels are available to accommodate auxiliary detectors without the need to modify the timing and trigger electronics.

The electronics setup features computer-selectable options for setting the trigger and timing. The standard trigger options include:

• the FP PIN
• the FP scintillator
• the XF scintillator
• the OR of the anode signals from the two FP PPACs
• the I2 scintillator
• the FP germanium detector
• the first (upstream) detector in the FP stack
• the second detector of the FP stack

The electronics setup includes four TACs for generating timing spectra as described in the table below:

	START SIGNAL	STOP SIGNAL
TAC1	selectable	I2 scintillator north
TAC2	selectable	I2 scintillator south
TAC3	selectable	cyclotron RF
TAC4	FP scintilator south	cyclotron RF

The selectable start signals can be set for all channels either to:

1. FP PIN
2. FP scintillator north
3. XF scintillator.

A fifth TAC, TAC5, is used to generate position information from the I2 scintillator based on the timing difference for light signals to reach the two sides of the detector.