International Workshop on Physics with Positrons at Jefferson Lab (JPos17)

Session

Plenary 4

Sep 12, 2017, 3:00 PM

Room F113 (CEBAF Center)

Conveners

Plenary 4

• Vasiliy Morozov (Jefferson Lab)

96. Operational Experience of Positron Beam at DESY

Ferdinand Willeke (Brookhaven National Lab)

9/12/17, 3:00 PM

90. Using CEBAF as a positron machine, prospects and limitations

Yves Roblin (Jefferson Lab)

9/12/17, 3:30 PM

Positron Source and Beam Physics

Oral Contribution

We will discuss the possibility of using CEBAF as a positron machine. After a review of the current machine capabilities, we will examine one particular scenario for generating, accelerating and transporting positrons in CEBAF. Modifications to the existing CEBAF machine will be discussed as well as expected performance and impact on the regular program.

18. Bipolar Operation of CEBAF Magnets -- Considerations and Implications

Michael Tiefenback (Jefferson Lab)

9/12/17, 4:00 PM

Positron Source and Beam Physics

Oral Contribution

Operation of CEBAF with positrons using the standard electron beam direction (clockwise as viewed from above) requires inverting the polarity of the recirculation arc and Spreader/Recombiner dipoles. Retaining the focusing optics used for electrons requires inverting the quadrupole gradients. The hardware readily supports reversed polarity, and no observations are known to suggest any change...

86. An Operational Diagnostic Complement for Positrons at CEBAF/JLab

Michael Tiefenback (JLab)

9/12/17, 4:30 PM

The CEBAF accelerator has a demonstrated capacity for delivery of electron current to Hall B at the ~100 nA level, on par with the current anticipated for future positron beams. However, machine configuration requires macropulse current levels of a few micro-Amperes due to limited sensitivity of many installed diagnostics. Informed by this operational experience, we outline a set of...

97. High Energy Polarimetry of Positron Beams

David Gaskell (Jefferson Lab)

9/12/17, 5:00 PM