Difference between revisions of "Target Lab Main"
From Hall A Wiki
(→How-to test a cell) |
|||
| Line 60: | Line 60: | ||
= How-to test a cell = | = How-to test a cell = | ||
| + | |||
| + | 1) RTDs: | ||
| + | - Test the target RTDs and the oven RTD at room temperature against a thermometer. | ||
| + | - Record their offsets. | ||
| + | - Discard RTDs with significant offsets. | ||
| + | - Place selected RTDs on the cell. | ||
| + | |||
| + | 2) Installation of the cell in the oven: | ||
| + | - Center the pumping chamber with respect to the oven windows. | ||
| + | - Seal the oven with RTV. | ||
| + | - Record position of the cell with respect to the pick-up coils for flux calculation purpose. | ||
| + | |||
| + | 3) Laser alignment: | ||
| + | - Check laser alignment (and light loss) at each optical element. | ||
| + | - Check 1/2 and 1/4 wave plates settings. | ||
| + | - Check the spectrum analyzer for optimal absorption. | ||
| + | |||
| + | 4) Cell testing: | ||
| + | - Set up the oven at the desired temperature. Wait for the temperature to stabilize. | ||
| + | - Turn on the lasers. Wait for the temperature to stabilize. | ||
| + | - Take NMR measurement every 3 hours. | ||
| + | - When spin up is done, do the following tests: | ||
| + | - EPR-NMR calibration: take EPR and NMR measurements 5 minutes apart following this sequence: EPR-NMR-EPR-NMR-EPR | ||
| + | - temperature test: take NMR measurements with lasers on and off following this sequence: ON-OFF-ON-OFF-ON. Before each measurement, make sure the cell temperature is stable. | ||
| + | - AFP loss test: take 5 NMR measurements 5 minutes apart. | ||
| + | |||
| + | 5) Spin down: | ||
| + | - Turn off the laser and the oven. Wait for the temperature to stabilize. | ||
| + | - Take NMR measurement every 3 hours. | ||
| + | |||
----- | ----- | ||
'''Go back to [[Hall_A_He3_Polarized_Target]]''' | '''Go back to [[Hall_A_He3_Polarized_Target]]''' | ||
Revision as of 15:28, 21 December 2011
This is main page for work in EEL Target Lab since 2010.
Contents
File directory
upload files to sub-directories of /u/group/halla/www/hallaweb/html/equipment/targets/polhe3/lab/
then you can see them at http://hallaweb.jlab.org/equipment/targets/polhe3/lab/
Cell Inventory
Old cell inventory before 2011
Meeting
Minutes of polhe3 bi-weekly meeting (Wed 10:30AM room F228)
Workshop on High Luminosity Polarized Targets for the 12GeV Era
Individual System R&D
Laser
Pulse NMR
Convection Cell
Coating
Metal Windows
Experiment Log
Cell Thickness Measurement
Diffusion Rate
Temperature Optimization
EEL Target Lab Records before 2010 September
virtual stockroom
item and material list
Wanted Item List (2011 Summer)
code
Docs
Gordon's A1n target talk on June 8, 2011
"A guide for the EPR Measurement at Jefferson Lab" Jlab-TN-01-012
Howto
How-to test a cell
1) RTDs:
- Test the target RTDs and the oven RTD at room temperature against a thermometer.
- Record their offsets.
- Discard RTDs with significant offsets.
- Place selected RTDs on the cell.
2) Installation of the cell in the oven:
- Center the pumping chamber with respect to the oven windows.
- Seal the oven with RTV.
- Record position of the cell with respect to the pick-up coils for flux calculation purpose.
3) Laser alignment:
- Check laser alignment (and light loss) at each optical element.
- Check 1/2 and 1/4 wave plates settings.
- Check the spectrum analyzer for optimal absorption.
4) Cell testing:
- Set up the oven at the desired temperature. Wait for the temperature to stabilize.
- Turn on the lasers. Wait for the temperature to stabilize.
- Take NMR measurement every 3 hours.
- When spin up is done, do the following tests:
- EPR-NMR calibration: take EPR and NMR measurements 5 minutes apart following this sequence: EPR-NMR-EPR-NMR-EPR
- temperature test: take NMR measurements with lasers on and off following this sequence: ON-OFF-ON-OFF-ON. Before each measurement, make sure the cell temperature is stable.
- AFP loss test: take 5 NMR measurements 5 minutes apart.
5) Spin down:
- Turn off the laser and the oven. Wait for the temperature to stabilize.
- Take NMR measurement every 3 hours.
Go back to Hall_A_He3_Polarized_Target
