Solid Target Shift
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.
Material near the target consists of the following:
- 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) - YELLOW FLAG (Tape) UP
- Empty Target Frame - YELLOW FLAG BEAM LEFT
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 position of the flag indicating the target position can be viewed using the camera in Hall D from the west wall. The camera can be accessed from Cameras in Hall D.
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 |
