9 Accelerator Operations
521
• Understanding Accelerator operations offers almost infinite possibilities for
empirical tweaking as a way around problems. There is no substitute for building
up real understanding of the key properties of a machine. These might include
aperture, optics, instabilities, beam losses, beam and luminosity lifetimes. Good
control and instrumentation are the tools of this trade and their importance is
again stressed.
• Safety High energy and high power machines bring with them a number of
risks. These risks have to be properly understood and protected against. For a
complex machine the process of understanding the risks and their, sometimes,
subtle interplay can be a painstaking process. Failure to perform this process
properly can prove costly.
9.2 Parameter Control
M. Lamont
The high level control system shall provide the following functionality:
• monitoring, recording and logging of accelerator status and process parameters;
• display of operator information regarding the accelerator status and beam
parameters;
• operational settings management should provide facilities for the settings
changes of all individual equipment systems; all settings changes shall be
recorded, with simple-to-use roll-back possibilities;
• automatic process control and sequence control during all beam related modes
of operation and covering all operational scenarios i.e. control within normal
operating limits;
• prevention of automatic or manual control actions which might initiate a hazard;
• detection of the onset of a hazard and automatic hazard termination (e.g. dump
the beam), or mitigation (e.g. establish control within safe operating limits).
In particular, control of the key beam parameters is vital to maintain good beam
lifetime and minimize beam loss at all stages of operation. A general operational
principle is to effect control at the appropriate level. Thus high level parameters such
tune, chromaticity, synchrotron tune, bucket area, phase advance should used where
appropriate. Software provides the appropriate translation to lower level hardware
parameters such as current and voltage. The results of more complex beam dynamics
analyses such as beta beating measurement and correction or the measurement and
correction of non-linear effects have also to be incorporated in a sensible way into
the machine settings.
521
• Understanding Accelerator operations offers almost infinite possibilities for
empirical tweaking as a way around problems. There is no substitute for building
up real understanding of the key properties of a machine. These might include
aperture, optics, instabilities, beam losses, beam and luminosity lifetimes. Good
control and instrumentation are the tools of this trade and their importance is
again stressed.
• Safety High energy and high power machines bring with them a number of
risks. These risks have to be properly understood and protected against. For a
complex machine the process of understanding the risks and their, sometimes,
subtle interplay can be a painstaking process. Failure to perform this process
properly can prove costly.
9.2 Parameter Control
M. Lamont
The high level control system shall provide the following functionality:
• monitoring, recording and logging of accelerator status and process parameters;
• display of operator information regarding the accelerator status and beam
parameters;
• operational settings management should provide facilities for the settings
changes of all individual equipment systems; all settings changes shall be
recorded, with simple-to-use roll-back possibilities;
• automatic process control and sequence control during all beam related modes
of operation and covering all operational scenarios i.e. control within normal
operating limits;
• prevention of automatic or manual control actions which might initiate a hazard;
• detection of the onset of a hazard and automatic hazard termination (e.g. dump
the beam), or mitigation (e.g. establish control within safe operating limits).
In particular, control of the key beam parameters is vital to maintain good beam
lifetime and minimize beam loss at all stages of operation. A general operational
principle is to effect control at the appropriate level. Thus high level parameters such
tune, chromaticity, synchrotron tune, bucket area, phase advance should used where
appropriate. Software provides the appropriate translation to lower level hardware
parameters such as current and voltage. The results of more complex beam dynamics
analyses such as beta beating measurement and correction or the measurement and
correction of non-linear effects have also to be incorporated in a sensible way into
the machine settings.