Mass Scan Manual
Status:
This information applies to Mass Scan version 1.0.33.8, the first release version of the program.
Contents:
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Overview
The mass scan program can scan a separator magnet and plot the beam current in a faraday cup as a function of the mass. The program from a rough calibration estimates the control current to the magnet. The plot is based on the actual mass values calculated in the vdMass virtual device. The scan calibration constants and the parameter names of the separator magnet etc. are stored in a dedicated table, MassScan, in the ConSys database. The mass scan program must be started with the machine name from the database as an option, ie.
"MassScan /ASTRID" or "MassScan /ELISA" etc.
Internal conversion function between mass and magnet current:
where k and c are calibration constants stored in the database.
NOTE code changed to q dependence and NOT q^2 dependence.
MassScan Database
The MassScan database table has the following keys:
MachineName: The name of the separator - or the machine where the separator is used as injector. This name must be given as an option to the mass scan program.
MagnetControl: ConSys Parameter name with surname for the magnet control.
MagnetReading: ConSys Parameter name with surname for the magnet reading.
Mass: ConSys Parameter name with surname for the calculated mass from vdMass.
FaradayCurrent: ConSys Parameter name with surname current measurement.
Charge: ConSys Parameter name with surname for charge (from vdMass).
AccVoltage: ConSys Parameter name with surname acceleration voltage - typical the control value.
CalibOffset: The calibration offset, c, used to calculate mass->current estimated.
CalibFactor: The calibration offset, k, used to calculate mass->current estimated.
MinMagnCurrent: The minimum current allowed for the separator magnet.
MaxMagnCurrent: The maximum current allowed for the separator magnet.
CourseCurrentStep: The current step used when moving to start of new scan. A new value is sent every second.
FineCurrentStep: The MASS [in amu] used to fine tune the start mass. A new value is sent every 1.5 second until the start mass is reached.
Last Modified 28 April 2020