Changing the quad settings
facet home → Profile Monitor → LI20 → SPEC LINE GUI
New SPECLINE GUI (Fall 2023):
- 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
- Note: You can select from a few preassigned beamline locations with the dropdown menu, or, select "custom"
- 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)
- Note - the "Trim" button does not do anything yet.
Dump table motors and filters:
IP2 Table on LI20 Profile monitor page:
Provides easier access to the dump table flippers (DTOTR1/2, LFOV) and motors.
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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Quad PVs
- LI20:LGPS:3141:BACT
- LI20:LGPS:3261:BACT
- LI20:LGPS:3091:BACT
- Dipole: LI20:LGPS:3330:BACT
BPMs
- #BPM before IP: 3156
bpm_3156_z = 1991.29 - #BPM Q0: 3218
bpm_3218_z = 1997.77 - #BPM Q1: 3265
bpm_3265_z = 2000.0 - #BPM Q2: 3315
bpm_3315_z = 2002.22
Quad Scan functions
- Spec_Quad_E (change energy for which the imaging conditions are calculated)
- Spec_Quad_M12 (angle at object plane to position at image plane matrix element: horizontal axis)
- Spec_Quad_M34 (angle at object plane to position at image plane matrix element: vertical axis)
- Spec_Quad_zim (position of image plane)
- Spec_Quad_zob (position of object plane)
Changing the dipole settings
- It is important that the e-beam never passes through the CsI array (see Dump-table electron diagnostics)
BNDS_LI20_3330 scan function
for LFOV: 6 to 22. Never go higher than 22!