1. From LHC to Accelerator class
Lukáš Malina
29/05/2019
OMC meeting

2. Motivation Measurement algorithms are independent of accelerator
Codes should be as well
To measure we need some information about accelerator
Type of information is a priori independent of accelerator
Container for such information: Accelerator class
Classes for specific accelerator should be child classes
29/05/2019
OMC meeting

3. Python 2 state … also python 3 initial state
Abstract accelerator class
Methods have to be implemented in child classes
Many things implemented for LHC
Some things implemented for other machines
Independently, accelerator classes are very accelerator dependent
Many things not implemented at all
29/05/2019
OMC meeting

4. New Accelerator class
Implements default methods and entrypoint wrappers
Can be overridden by child classes
Content and structure close to union of all accelerator classes
Most of stuff comes from LHC
Option to initialise from model directory
Use in optics measurements
Still compatible with model creation through the GUI
Inconsistencies to be resolved … will break the compatibility
29/05/2019
OMC meeting

5. Child classes - samples
class Ps(Accelerator): """ Parent Class for Ps-Types. """ NAME = "ps" MACROS_NAME = "ps" YEAR = # Public Methods ########################################################## def verify_object(self): pass @classmethod def get_ps_dir(cls): return os.path.join(PS_DIR, str(cls.YEAR)) @classmethod def get_segment_tmpl(cls): return cls.get_file("segment.madx") @classmethod def get_file(cls, filename): return os.path.join(CURRENT_DIR, "ps", filename) # Private Methods ########################################################## class _PsSegmentMixin(object): def __init__(self): self._start = None self._end = None self.energy = None
class Esrf(Accelerator): NAME = "esrf" RE_DICT = {"bpm": r"BPM", "magnet": r".*", "arc_bpm": r"BPM\.(\d*[02468]\.[1-5]|\d*[13579]\.[3-7])", } # bpms 1-5 in even cells and bpms 3-7 in odd cells.
class SKekB(Accelerator): """ KEK's SuperKEKB accelerator. Beam direction inverted for now for using with HER. """ NAME = "skekb" MACROS_NAME = "skekb" def verify_object(self): # TODO: Maybe more checks? if self.model_dir is None: # is the class is used to create full response? raise AcceleratorDefinitionError("SuperKEKB doesn't have a model creation, calling it this " "way is most probably wrong.") def get_beam_direction(self): return -1
29/05/2019
OMC meeting

6. New Accelerator class II
We should unify model directory content
Partial review/change needed when transfering
Segment-by-segment
Global correction
Model creation works, but
waits for the state of sequence files repositories
Should be further unified
29/05/2019
OMC meeting

7. Optics measurements in omc3 master
Codes are simplified, modular and more robust
Uses accelerator class, i.e. work not only for LHC
Except for coupling
Simple accuracy test in place
29/05/2019
OMC meeting

8. Conclusions and outlook
Accelerator class is much more generic
Optics measurements work not only for LHC
First version already available in omc3 master
What is the status of sequence files repositories in gitlab?
29/05/2019
OMC meeting