Should UnitConv objects include strings for the unit names?

[willrogers]

e.g. BPMs convert between mm and m; magnets typically convert between A and some magnetic field.

[T-Nicholls]

fields: PHYS <-> ENG
x&y: mm <-> m
f: Hz <-> Hz
x&y_kick: 100th of a rads <-> A
b0&b1&b2&a1: field strength(Tesla, Gauss, k in mml?) <-> A
These are all our element fields and my guesses at their respecive units.

[T-Nicholls]

fields: PHYS <-> ENG (according to the internet)
m44: ? <-> same
s_position: m <-> m
alpha: ? <-> same
beta: m <-> m
mu: ? <-> same
dispersion: ? <-> same (For instance in LEP, where the dispersion is of the order of a metre?)
tune_x&y: ? <-> same (The “tune” or Q value, often denoted also with v)
chromaticity_x&y ? <-> same (Figure 3.9a shows the actual chromaticity measurements converted to units of b2 as a function of energy?)
energy: Mev <-> Mev
emittance_x nm <-> nm
emittance_y: pm <-> pm
beam_current: A <-> A
This is my attempt at the lattice fields, both live and sim.

[T-Nicholls]

In the process of being implemented through pull request #98.

[willrogers]

You can find at least some of these in Middlelayer:

>> ao = getao;
>> ao.Q1B.Monitor

ans = 

                Mode: 'Online'
               Units: 'Physics'
             HWUnits: 'a'
            DataType: 'scalar'
        ChannelNames: [34x17 char]
               Range: [34x2 double]
        PhysicsUnits: 'm^-2'
       HW2PhysicsFcn: @amp2k
       Physics2HWFcn: @k2amp
    HW2PhysicsParams: [34x1 double]
    Physics2HWParams: [34x1 double]

[T-Nicholls]

Still unknown:

• m44
• alpha
• mu
• dispersion
• tune
• chromaticity
• a1, b1 etc... mml has them as m^-something but should field strength be a component?

[willrogers]

Units of angles are dimensionless.

My current best guesses:

• m44 - dimensionless
• mu - dimensionless
• dispersion - m
• tune - dimensionless
• chromaticity - dimensionless
• alpha - dimensionless
• beta - m
• gamma m^-1

Because of the way that ax and bx are normalised, the MML units are correct.

[T-Nicholls]

Now fully implemented in #98.