Beam Setup and Measurement - May 2018
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Energy Setup and Measurement
Emittance Measurement
- Setup beam to FC2
- Use qsUtility configuration files to scan MQJ0L02 and/or MQJ0L02A and uses harp IHA0L03
- Be sure to enter the correct momentum in the configuration and/or analysis files
- Elegant optics lattice begins at MQJ0L02 (that is, use or propagate optics to that location)
Energy Spread Measurement
- Setup beam to 2D spectrometer dump
- Upstream quads MQJ0L02 and MQJ0L02A can be any value but their integrated gradient value B'L (.BL field) must be recorded
- Use HarpFitterTool to scan IHA2D00 to measure horizontal beam size
- Use Elegant to calculate the horizontal beta (betax) and the horizontal dispersion (etax) at the harp location
- Update lattice file
- Type command cd /usr/opsdata/bubble/elegant/May2018/lattice
- Edit lattice file BubbleChamber.lte
- Update K1 values for MQJ0L02/MQJ0L02A (they appear in only one place)
- Update energy spread elegant file
- Type command cd /usr/opsdata/bubble/elegant/May2018/energy_spread
- Edit command file energyspread.ele
- Update p_central_mev[MeV/c]
- Update beta_x[m] and beta_y[m] with qsUtility values computed at MQJ0L02
- Update emit_nx[m-rad] and emit_ny[m-rad] with qsUtility values compated at MQJ0L02
- Run Elegant model
- Type command cd /usr/opsdata/bubble/elegant/May2018/energy_spread
- Type command elegant energyspread.ele
- Type command sddsprintout -col=ElementName -col=betax -col=etax energyspread.twi
- Record value of betax[m] and etax[m] at IHA2D00
- Update lattice file
Optics Setup
- Chris Tennant's Elegant Model from September 2015 installed for reference:
- /usr/opsdata/bubble/elegant/Sep2015
- Elegant Model files updated for May 2018:
- /usr/opsdata/bubble/elegant/May2018
- Lattice file definition of beam lines and defaults:
- /usr/opsdata/bubble/elegant/May2018/lattice