Difference between revisions of "Solid Target Shift"
From Hall D Ops Wiki
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== The Solid Target == | == The Solid Target == | ||
| − | The | + | * The 208Pb target, manufactured by Oak Ridge National Laboratory, is a 1-in.-diameter circular foil of 99.09% enriched 208Pb, with an approximate thickness of 12 mils. |
| + | * A description of the target can be found in [https://doi.org/10.1016/j.nima.2009.09.063 P. Martel et al., "Nuclear Targets for a Precision Measurement of the Neutral Pion Radiative Width," NIMA 612 (2009) 46-49.] | ||
| − | + | == Beam Line Components == | |
| − | + | * exit beam pipe window: 125um Kapton | |
| − | * | + | * distance from exit beam pipe window and target: ~3cm |
| − | + | * distance from lead target to entrance He bag: ~1cm | |
| − | * | + | * entrance and exit window He bag: 50um aluminized mylar |
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== Routine Operation == | == Routine Operation == | ||
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There is no remote control for the target. Changing configuration (i.e. changing cap type or cap position) requires an access and a manual change and will be performed by experts. | There is no remote control for the target. Changing configuration (i.e. changing cap type or cap position) requires an access and a manual change and will be performed by experts. | ||
| − | [ | + | * [https://halldweb.jlab.org/DocDB/0056/005638/001/CPP_Lead_Target_Change_Procedure_v1.pdf Change from Full to Empty Target] |
| − | + | Note: Documentation of original Hall D target in 2014 can be found in the deprecated pages [[Solid Target Shift Original]] | |
== Expert personnel == | == Expert personnel == | ||
Revision as of 08:33, 10 June 2022
The Solid Target
- The 208Pb target, manufactured by Oak Ridge National Laboratory, is a 1-in.-diameter circular foil of 99.09% enriched 208Pb, with an approximate thickness of 12 mils.
- A description of the target can be found in P. Martel et al., "Nuclear Targets for a Precision Measurement of the Neutral Pion Radiative Width," NIMA 612 (2009) 46-49.
Beam Line Components
- exit beam pipe window: 125um Kapton
- distance from exit beam pipe window and target: ~3cm
- distance from lead target to entrance He bag: ~1cm
- entrance and exit window He bag: 50um aluminized mylar
Routine Operation
There is no remote control for the target. Changing configuration (i.e. changing cap type or cap position) requires an access and a manual change and will be performed by experts.
Note: Documentation of original Hall D target in 2014 can be found in the deprecated pages Solid Target Shift Original
Expert personnel
The individuals responsible for checking that the solid target is ready to take data and setting its operating parameters are shown in following table. Additional experts may be trained by the system owner and their name and date added to this table.
| Name | Extension | Date of qualification |
|---|---|---|
| Tim Whitlatch | Office: 757-269-5087 | June 10, 2022 |
