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Message ID: 18     Entry time: Mon Mar 24 14:44:14 2025
Author: C Griffin, M Cockshutt, I Dillmann 
Category: General 
Subject: April 2025 experiment setup 
Further PLEIADES tests are to be carried out during E018 and E203. This will be an important test of PLEIADES operation in isochronous mode and provide an opportunity to try better understand the PID 
"handle" seen in the analysis of the data collected in 2022.

PLEIADES detectors will be installed at the ESR in opposing pocket positions after the dipole following the gas-jet target.

Much of the setup remains the same as in the previous tests.

To optimise channel assignments and require only 4 FEBEX cards to fully instrument each detector, slot 7 is left vacant and the final Si pad is positioned in slot 8.
See signal table in Elog https://elog.gsi.de/esr/Beavertail/1 for further clarification re. read out of slot 7/8.

Current detector layouts are as follows:

Detector 1:
Slot 1: MSPAD 17A
Slot 2: DSSD 161054
Slot 3: MSPAD 17B
Slot 4: MSPAD 17C
Slot 5: MSPAD 16A
Slot 6: MSPAD 16B
Slot 7:
Slot 8: MSPAD 16C
Crystal: GAGG

Detector 2:
Slot 1: Design I 14
Slot 2: DSSD 121813
Slot 3: MSPAD 15B
Slot 4: Design I 13
Slot 5: Design I 8
Slot 6: Design I 6
Slot 7:
Slot 8: Design I 3
Crystal: BGO

MSPAD 16C has been installed in slot 8 of housing 1 having had its rear bond wires repaired on the 16 November 2023. 
16C has 3 rear bond wires. 
Full function has not yet been confirmed.

The Go4 parameter file will be updated to reflect the change in active channels before the start of the experiment.

Additional notes:

MSPAD 15C shows some lifting between the carrier PCB and Si chip and, while there is nothing to suggest is isn't fully operational, needs checking before future use.

Design-I detectors 81, 82 and 5 are in the spare housing in the vacuum safe in Jan's container.

DSSD 121812 is in the extra detectors box in the container, but is in the supplier box labelled for DSSD 161054.
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