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 saved into histograms. The helicity may be flipped after each scan, or, in some modes, after each PPG Cycle. In this mode, the data are output after each increment as MIDAS-format data, and converted to MUD-format by a MIDAS client running on the host.

Type 2 (TD-MUSR)

In this mode, the variable (i.e. RF)

the data acquisition works like a multi-channel scaler. The data for each PPG Cycle is accumulated in front-end histograms,

Mode 10 (Scalers)

This mode is the simplest Type 1 (I-MUSR) mode, and is used for testing the scalers (SIS3801).