Difference between revisions of "He3 Target Test Items"
From Hall A Wiki
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* Condition optimization: oven temperature as a function of gas flow and heater power | * Condition optimization: oven temperature as a function of gas flow and heater power | ||
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=== NMR === | === NMR === | ||
Revision as of 12:19, 9 January 2012
Contents
Target Holding Field
- Field survey
- Field rotation check
Cell Characterization
Density
- Filling density
- Broadening of Alkali absorption
Wall Thickness
- Laser interference measurement: wall and window
Optical Pumping System
Laser Optics
- Laser power measurement
- Laser spectrum measurement/Absorption adjustment
- Calibrations of optics orientations, e.g. λ/4 plates
- Laser polarization measurement
- Optics alignment
- Power consumption at laser connectors (if there is any)
Oven
- RTD calibration
- Condition optimization: oven temperature as a function of gas flow and heater power
Polarimetry
NMR
- System Q-curve measurement of all pickup coils to prevent resonance
- Minimize pickup coil background with maximum RF power
- Linearity check of amplifiers: preamplifier, lock-in amplifier
- Flux calibration: pickup coil survey and flux calculation
- He3 NMRs: frequency and field sweeps (including NMRs during EPR calibration)
- AFP loss measurement
- Internal temperature measurement in pumping chamber using NMR
- NMR cross calibration: frequency vs. field, different locations
- Water NMR calibration: field sweep (frequency sweep as well if possible)
EPR
- Characterization of feedback system: proportional and integration gains
- EPR calibration: absolute polarization measurement
- Cross check with water calibrated NMRs
MISC Studies
- Spin up time
- Relaxation time: room temperature, high temperature
- Optimization of pumping condition: laser power, oven temperature
- Polarization gradient across cell
