Beam-phase monitoring with non-destructive pickup

Technical Report · Tue Aug 01 04:00:00 EDT 1995

DOI:https://doi.org/10.2172/166400· OSTI ID:166400

Bogaty, J.; Clifft, B. E.

An intensity and phase-sensitive capacitive pickup was installed at the entrance to the PII linac. This device is based on an extension of the design of the Beam Current Monitor developed as part of the ATLAS radiation safety system. The purpose of the pickup is to allow the arrival phase of the beam from the ECR source at the entrance to the PII linac to be set to a standard which reproduces previous tune conditions and establishes a standard. The new pickups and associated electronics demonstrated sensitivity well below 1 electrical nanoamp but can handle beam currents of many electrical microamps as well. In addition to phase information, beam current is also measured by the units thus providing a continuous, non-intercepting current readout as well. From the very first use of PII, we established a few {open_quotes}reference tunes{close_quotes} for the linac and scaled those tunes for any other beam desired. For such scaling to work properly, the velocity and phase of the beam from the ion source must be fixed and reproducible. In last year`s FWP the new ATLAS Master Oscillator System was described. The new system has the ability of easily adjusting the beam arrival phase at the entrance to each of the major sections of the facility - PII, Booster, ATLAS. Our present techniques for establishing the beam arrival phase at the entrance of each of the linac sections are cumbersome and, sometimes, intellectually challenging. The installation of these capacitative pickups at the entrance to each of the linac sections will make the determination and setting of the beam arrival phase direct, simple, and dynamic. This should dramatically shorten our setup time for {open_quotes}old-tune{close_quotes} configurations and increase useful operating hours. Permanent electronics for the PII entrance pickup is under construction.

• Research Organization: Argonne National Lab., IL (United States)
• OSTI ID: 166400
• Report Number(s): ANL--95/14; ON: DE96000985
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ATLAS SUPERCONDUCTING LINAC
BEAM CURRENTS
BEAM MONITORING
BEAM MONITORS
DESIGN
PARTICLE BOOSTERS
PROGRESS REPORT