Changing the quad settings
facet home → Profile Monitor → LI20 → SPEC LINE GUI
- Leave big "Dipole" switch in "Without" setting (dipole energy is not adjusted)
- Set "Z Object" to the position where the beam should be imaged, e.g., the center of the PB
- Set "Z Image" to the position of the screen, e.g., z=2015.26 for DTOTR
- M12, M34: transfer-matrix elements (set both to 0 for re-imaging)
- Energy: determines where the focus is
- Press "Calculate and Trim"
- ATTENTION: there is no possibility to calculate without actually changing the magnets. There will be no elog entry! (2023, Nov 17)
Scripts for dealing with the spectrometer
- FACET_EspecImaging.m (Alex Knetsch, Nov 13, 2023)
- E300_calc_QS_3.m (FACET MATLAB TNG repo, Nov 13, 2023): script to calculate quad settings
- espec_trim.py (Sebastian Meuren, Nov 13, 2023)
Assumptions made in this script:
- Magnet length: 1m
LEFF_QS0 = 1; % [m]
LEFF_QS1 = 1; % [m]
LEFF_QS2 = 1; % [m] - Quad positions:
z_QS0 = 1996.98249; % [m], middle of quad
z_QS1 = 1999.206615; % [m], middle of quad
z_QS2 = 2001.431049; % [m], middle of quad - Other important positions:
1993.27370 # [m] FILS
1992.82000 # [m] PIC_CENT
2015.62984 # [m] LFOV
2017.52998 # [m] PRDMP
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Changing the dipole settings
- It is important that the e-beam never passes through the CsI array (see Dump-table electron diagnostics)