Polhe3 meeting 20110713
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Revision as of 15:43, 13 July 2011 by Zwzhao (Talk | contribs) (New page: * progress ** new cell and oven bottom piece *** Mike should have the first cell sent out to UVa now, need confirmation though. *** Jie did a summary of [[Convection_Cell#Transitivity_cell...)
- progress
- new cell and oven bottom piece
- Mike should have the first cell sent out to UVa now, need confirmation though.
- Jie did a summary of Convection_Cell#Transitivity_cell_tolerance
- Alan starts to design and make the oven bottom piece to according to the drawing and tolerance, hopefully finish around the time when the new cell arrives before end of July.
- RTD reading
- the problem: oven RTD is in air and pumping cell (PC) RTD on cell, they are about 5-10cm apart. At room temperature, their reading are very close within 1-2C. at more than 200C, the oven RTD is about 15C higher than PC RTD.
- Oven RTD is confirmed with 3-wire reading.
- the oven RTD's Omega read out unit found to have setting 392 while it should be 385 if the RTD is Omega F3105 model (http://www.omega.com/Temperature/pdf/F3105_3100_W2100_2200.pdf). The error created by the setting is 200C*(0.00392/0.00385)=3.6C and 20C*(0.00392/0.00385)=0.36C, (refer to http://en.wikipedia.org/wiki/Resistance_thermometer#Standard_resistance_thermometer_data). This won't explain the 15C difference.
- pulse NMR
- The items we have and a list of items to buy are identified. We have most of stuff for it and we need to buy or make some. refer to Polhe3_wanted_item_list_2011_summer
- temperature optimization test
- redid 210C and 230C spin up.
- reorganized results
- diffusion mode measurement
- the current NMR RF coil has 2ohm and about 40cm radius
- using an existing 4ohm EPR RF coil did some tests. refer to https://hallaweb.jlab.org/wiki/index.php/Diffusion_rate
- convection flow study
- identify small heater to as the flower driver.
- transfer tube wall measurement
- found ultrasonic gauge
- new cell and oven bottom piece
- todo
- new cell and oven bottom piece (zhiwen)
- follow up
- RTD reading (Jie)
- check PC RTD reading setting
- do calibration once we can take RTD out
- During the transitivity experiment, the reading may have same setting problem. how much it affect results, need to be checked. refer to
- new cell and oven bottom piece (zhiwen)
https://hallaweb.jlab.org/wiki/index.php/Oven_Control#Input
- pulse NMR (all)
- order items and refine the list (Zhiwen)
- find or make coil, matchbox (Chunhua)
- write code for reading (Jie)
- setup (all)
- diffusion mode measurement (Chunhua)
- make two coils to confine field more.
- measurement NMR at different RF power, derive optimal H1 to destroy field
- do another test
- convection flow study (Zhiwen)
- find out if heater material has magnetic and order them
- temperature optimization test (Chunhua)
- redo 230 spin down
- improve analysis and check fitting with error estimation
- water measurement
- transfer tube wall measurement (Jie)
- do it
- pulse NMR (all)
- Calendar
| Week | Tasks | To be done by | status |
|---|---|---|---|
| 6/29-7/3 | Complete temperature testing with RTD correction study | Chunhua, Zhiwen, Jie for RTD | part |
| Tolerance measurement | Jie, Zhiwen | done | |
| ID supply list for pulsed NMR | Zhiwen | part | |
| 7/7-7/13 | Conduct diffusion test | Chunhua, Zhiwen, (Jie) | part |
| general inventory check and ordering | Chunhua, Zhiwen | part | |
| 7/14-7/20 (tentative) | Expect to receive the new cell. Maybe oven fit check (but will not mount for testing), adjustment by Al G. if needed | Chunhua, Zhiwen | |
| Pulsed NMR prep | Chunhua, Zhiwen | ||
| 7/20-8/15 (tentative) | Pulsed NMR setup on a traditional cell | Chunhua, Jie |
