Difference between revisions of "Solid Target Shift"
From Hall D Ops Wiki
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== Change between Full and Empty Targets == | == Change between Full and Empty Targets == | ||
− | The target holder has two positions: Full (208Pb) and Empty (dummy frame). Changes between the two configurations requires an access to the hall, which may be conducted in Rapid Access Mode. Changes between the configurations should be performed by personnel familiar with the procedure: | + | The target holder has two positions: |
+ | * Full (208Pb) and | ||
+ | * Empty (dummy frame). | ||
+ | Changes between the two configurations requires an access to the hall, which may be conducted in Rapid Access Mode. Changes between the configurations should be performed by personnel familiar with the procedure: | ||
* [https://halldweb.jlab.org/DocDB/0056/005638/001/CPP_Lead_Target_Change_Procedure_v1.pdf Change from Full to Empty Target] | * [https://halldweb.jlab.org/DocDB/0056/005638/001/CPP_Lead_Target_Change_Procedure_v1.pdf Change from Full to Empty Target] |
Revision as of 08:40, 10 June 2022
Contents
Description of Solid Target for CPP-NPP
- 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
Change between Full and Empty Targets
The target holder has two positions:
- Full (208Pb) and
- Empty (dummy frame).
Changes between the two configurations requires an access to the hall, which may be conducted in Rapid Access Mode. Changes between the configurations should be performed by personnel familiar with the procedure:
Original Solid Targets from 2014
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 |