Measurement of higher-order mode losses in SPEAR II by shift in synchrotron phase and increase in net cavity power

Technical Report · Fri Jan 01 00:00:00 EST 1988

DOI:https://doi.org/10.2172/7166998· OSTI ID:7166998

It has been estimated that the loss to higher-order cavity modes in SPEAR II will be 135 keV per cavity at 100 mA for a 10-cm bunch (sigma/sub z/ = 5 cm). This corresponds to a loss of 10 MeV for a 50-m PEP structure. The power lost to higher modes in each SPEAR II cavity at 100 mA would be 13.5 kW. A loss of this order can be measured by calorimetry. This loss is also large enough to cause a significant increase in the net rf power input into the cavities over the power input with no higher-mode excitation. In addition, the higher-mode loss can also produce a measurable shift in the synchronous phase angle. Numbers for these effects are computed in this paper.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 7166998
• Report Number(s): SLAC-PEP-NOTE-103; ON: DE88013657
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
SPEAR
ENERGY LOSSES
CAVITIES
PRESSURE VESSELS
RF SYSTEMS
SYNCHROTRON RADIATION
BREMSSTRAHLUNG
CONTAINERS
ELECTROMAGNETIC RADIATION
LOSSES
RADIATIONS
STORAGE RINGS
430400* - Particle Accelerators- Storage Rings