BNMR: Experimental Modes
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Introduction
This page describes the different experimental modes (also known as PPG modes). Refer also to the timing diagram for the mode. The mode is selected from the bnmr or bnqr custom status page. All modes are of Type 1 (c.f. I-musr), type 2 (c.f. TD-Musr), or a combination of both types. All Type 1 modes have a designation starting with "1", e.g. "1a","1f". Similarly all type 2 modes start with a "2", e.g. "2a", "2e". Some modes also have a name, e.g. Mode "10" is called "Scalers", Mode "20" is called "SLR". See full list of modes here.
Note that the data are saved in different histograms depending on whether the mode is Type 1 or Type 2. The combination modes are given a type designation (1 or 2) according to how their histograms are saved.
Type 1 (I-MUSR)
In this mode, a variable is incremented between a maximum and a minimum value forming a "scan", which is then repeated. At each increment, one of more PPG Cycles are run, and the data are stored in histogram memory in the frontend. In this mode, the histogram data are output after each increment, and saved as MIDAS-format data by the standard MIDAS logger mlogger. The helicity may be flipped after each complete scan, or, in some modes, after each PPG Cycle. The frontend histogram memory is cleared after the data are output at each scan increment. This MIDAS-format file is then converted to MUD-format by the MIDAS client mdarc.
Type 2 (TD-MUSR)
In this mode, the scaler data for each PPG Cycle is accumulated in the histogram memory in the frontend. The RF may be turned on for part of the cycle. The histogram memory is only cleared at the begin-of-run, and the histograms are accumulated within the frontend. Periodically, the data is read out bymdarc, and saved directly into MUD format.
Mode 10 (Scalers)
This mode is the simplest Type 1 (I-MUSR) mode, and is used for testing the scalers (SIS3801).