Problem Description

1
Technical Description

• Problem Description
• High-intensity operation at hgt1 is susceptible to
  longitudinal coupled bunch and single bunch
  instabilities
• These instabilities are difficult to predict and
  simulate (close relationship to task 20)
• Technical Systems
• Bunch-by-bunch longitudinal feedback (for dipole
  modes of oscillation)
• Measurement of bunch positions in time domain
• Broadband RF kicker cavity
• Short risetimes required because of bunch-spacing
• One signal path per bunch
• Higher order mode feedback
• Measurement of beam signal in frequency domain
• Broadband RF kicker cavity
• Each frequency component may be processed
  individually using DSP (filtering, weighting,
  etc.)

2
Objectives

• Requirement Analysis
• Simulations, analytical calculations for fixing
  the main parameters
• Kicker voltage
• Bandwidth
• Delay
• Comparison with other systems
• Concept
• Description of the system topology for both types
  of feedback system
• Systems must be based on modern digital
  technology (DSPs, FPGAs) in order to have a
  universal and flexible solution
• Experiments with prototypes of sub-components
• Design Specification
• Detailed description of both systems
• Should ideally serve as the basis for a prototype
  construction

3
Organizational Issues

• Personnel
• Coordinators
• CERN R. Garoby?C. Rossi
• GSI H. Klingbeil
• Posts at GSI
• 1 new Physicist
• 1 new Engineer
• Both are also responsible for Task 19
• Advertisements for posts are prepared but not yet
  published
• Physicist will stay at CERN for a few weeks
• 93.6 person-months _at_ GSI, 6 person-months _at_CERN
  (3 years duration)

4
Organizational Issues

• Work Sharing
• GSI
• Beam dynamics studies and simulations
• Low-level RF development based on DSPs and FPGAs
• Closed-loop control simulations (partly based on
  CERN code)
• CERN
• Participation in beam dynamics studies and
  simulations
• Kicker and Pickup investigations
• General design of power amplifier
• Participation in closed-loop control simulations
  (with exisiting code)
• First prototype of RF kicker cavity
• Tentative schedule for 2005 available

5
Schedule (Description of Work)

• Personnel not yet available ? 5...6 months
  shifted

6
Costs