The relation of electrode voltages to charge position in SLC arc and final focus beam position monitors

Technical Report · Thu Nov 02 00:00:00 EST 1989

DOI:https://doi.org/10.2172/5357110· OSTI ID:5357110

Fordham, C

The position of a charged particle beam can be measured with a Beam Position Monitor (BPM) by converting the voltages induced on its array of electrodes into a position offset from the array's center. Most of the BPMs in the Arcs and Final Focus of the SLC use four stripline electrodes arranged symmetrically around the beam; normalized voltage differences are calculated as the difference divided by the sum of voltages on opposite electrode pairs. The resulting number is multiplied by a conversion factor, denoted in this paper as S{sub b}, to give the offset (in millimeters) of the charge from the center of the BPM. Prior to installation in the beam line, the BPMs were calibrated with a charge pulse on a rod. Owing to geometric effects which will be discussed later, a different conversion factor had to be used for calibration. It will be denoted here by S{sub r}. This paper gives the results of calculations and measurements of S{sub r} and S{sub b} for Arc and Final Focus BPMs. This paper also describes the relevant physical properties of the several types of BPMs and calculations of the expected scale factors, the measurement methods used, and gives the results of measurements, which are compared with the theoretical expectations. 2 refs., 18 figs., 7 tabs.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 5357110
• Report Number(s): SLAC-CN-372; ON: DE90003763; TRN: 90-001053
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
STANFORD LINEAR COLLIDER
BEAM POSITION
BEAM FOCUSING MAGNETS
BEAM MONITORS
CALCULATION METHODS
ELECTRIC POTENTIAL
ELECTRODES
MEASURING METHODS
ACCELERATOR FACILITIES
ACCELERATORS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
LINEAR ACCELERATORS
MAGNETS
MEASURING INSTRUMENTS
MONITORS
430200* - Particle Accelerators- Beam Dynamics
Field Calculations
& Ion Optics