Difference between revisions of "He3 Target Test Items"
From Hall A Wiki
m (→Optical Pumping System) |
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== Target Holding Field == | == Target Holding Field == | ||
| − | * Field survey | + | * Field survey: field strengh, gradient |
| − | * Field rotation check | + | * Field rotation glitch check |
== Cell Characterization == | == Cell Characterization == | ||
| Line 8: | Line 8: | ||
* Filling density | * Filling density | ||
* Broadening of Alkali absorption | * Broadening of Alkali absorption | ||
| + | * N2 density: filling density, pressure curve | ||
=== Wall Thickness === | === Wall Thickness === | ||
* Laser interference measurement: wall and window | * Laser interference measurement: wall and window | ||
| + | |||
| + | === Cell Volume/Geometry === | ||
| + | * Caliper method | ||
| + | * Archimedes' method | ||
== Optical Pumping System == | == Optical Pumping System == | ||
| Line 29: | Line 34: | ||
=== NMR === | === NMR === | ||
| − | * | + | * Q-curve measurement of all pickup coils to prevent resonance |
* Minimize pickup coil background with maximum RF power | * Minimize pickup coil background with maximum RF power | ||
* Linearity check of amplifiers: preamplifier, lock-in amplifier | * Linearity check of amplifiers: preamplifier, lock-in amplifier | ||
| Line 41: | Line 46: | ||
=== EPR === | === EPR === | ||
* Characterization of feedback system: proportional and integration gains | * Characterization of feedback system: proportional and integration gains | ||
| − | * D2 light detection optimization | + | * D2 light detection optimization [http://userweb.jlab.org/~yqiang/files/target/EPR_D2/D2_signal.pdf] |
* EPR calibration: absolute polarization measurement | * EPR calibration: absolute polarization measurement | ||
* Cross check with water calibrated NMRs | * Cross check with water calibrated NMRs | ||
| Line 51: | Line 56: | ||
* Optimization of pumping condition: laser power, oven temperature | * Optimization of pumping condition: laser power, oven temperature | ||
* Polarization gradient across cell | * Polarization gradient across cell | ||
| + | |||
| + | == Reference == | ||
| + | * [http://userweb.jlab.org/~yqiang/files/talks/20090129_Target_Analysis.pptx Target analysis procedure for Transversity] | ||
| + | * [http://userweb.jlab.org/~yqiang/files/target/Long/Q-wave.pdf Solutions for non-phase-consvering mirrors using Q-wave plates] | ||
| + | * [http://userweb.jlab.org/~yqiang/files/target/EPR_D2/EPR_D2_83.pdf Design of a D2 light collection system] | ||
Latest revision as of 13:03, 9 January 2012
Contents
Target Holding Field
- Field survey: field strengh, gradient
- Field rotation glitch check
Cell Characterization
Density
- Filling density
- Broadening of Alkali absorption
- N2 density: filling density, pressure curve
Wall Thickness
- Laser interference measurement: wall and window
Cell Volume/Geometry
- Caliper method
- Archimedes' method
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 [1]
- 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
- 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
- D2 light detection optimization [2]
- EPR calibration: absolute polarization measurement
- Cross check with water calibrated NMRs
- D1 light EPR measurement (if using narrow-band laser)
MISC Studies
- Spin up time
- Relaxation time: room temperature, high temperature
- Optimization of pumping condition: laser power, oven temperature
- Polarization gradient across cell
