Run 17 configuration (p-Carbon)

Last modified by Schmidke on 17-05-2017

Run 15 configuration

Run 17 configuration

Run 2? configuration

An overview: DAQ configuration, detectors & target assignments, Am/Gd source locations.

Readout

As since Run 12 the readout had independent systems for the Blue and Yellow polarimeters. This provided improved stability and simpler and faster setup and adjustment of e.g. timing parameters.

Detectors

All detectors in all ports were BNL 2mm strip width, installed with azimuthal segmentation. 29(check?) new detectors were produced by Instrumentation in late 2016.

Summaries of dark current tests of most of the 2mm detectors are here: summary.

All detectors were tested with an $^{241}$Am alpha source. One with a dead channel and one with several low pulse height channels were rejected.

Wafer/chip->port assignments: B1 B2 Y1 Y2

Targets

The targets were from the standard fabrication technique, 2x thinnest size: 50 nm thick x 7-10 $\mu$ wide x 25 mm long. A new feature since 2015 was the addition of small disks ("fins") where the targets attached to the frame; EM simulations showed that this would reduce fields at the attachment point and hence reduce ohmic heating. Due to space limitations the target positions closest to the chamber wall (5,6) could not be fitted with the disks.

Details: B1V B1H B2V B2H Y1V Y1H Y2V Y2H

Alpha Sources

As in previous years there were $^{241}$Am sources at all 90-deg. ports. As since Run 12 $^{148}$Gd sources were also installed at the 90-deg. ports in B2D and Y2U.

PMT/scintillator pairs

A new feature...

Last modified by Schmidke on 17-05-2017