Task 18 SIS100_2: Longitudinal Feedback System - GSI

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Nov 16, 2013 (3 years and 6 months ago)

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1

Task 18 SIS100_2: Longitudinal Feedback System

15.04.2005 Dr. H. Klingbeil

Problem Description


High
-
intensity operation at h>1 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.)





Technical Description

2

Task 18 SIS100_2: Longitudinal Feedback System

15.04.2005 Dr. H. Klingbeil

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





Objectives

3

Task 18 SIS100_2: Longitudinal Feedback System

15.04.2005 Dr. H. Klingbeil

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 @ GSI, 6 person
-
months @CERN (3 years duration)





Organizational Issues

4

Task 18 SIS100_2: Longitudinal Feedback System

15.04.2005 Dr. H. Klingbeil

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





Organizational Issues

5

Task 18 SIS100_2: Longitudinal Feedback System

15.04.2005 Dr. H. Klingbeil





Schedule (Description of Work)


Personnel not yet available
→ 5...6 months shifted

6

Task 18 SIS100_2: Longitudinal Feedback System

15.04.2005 Dr. H. Klingbeil





Costs

Task 18: SIS100_2 (Longitudinal Feedback)
2005
2006
2007
Total
Scientists
1,5
1,4
1
3,9
126.000,00 €
117.600,00 €
84.000,00 €
327.600,00 €
Engineers
1
1,4
1,5
3,9
84.000,00 €
117.600,00 €
126.000,00 €
327.600,00 €
Investment
46.000,00 €
46.000,00 €
46.800,00 €
138.800,00 €
2005
2006
2007
Total
Scientists
0,15
0,15
0,2
0,5
17.000,00 €
17.000,00 €
23.000,00 €
57.000,00 €
Engineers
0
0
0
0
0,00 €
0,00 €
0,00 €
0,00 €
Investment
9.000,00 €
20.000,00 €
20.000,00 €
49.000,00 €
Total
282.000,00 €
318.200,00 €
299.800,00 €
900.000,00 €
In 2005, a part of the GSI investment costs will be transferred from Task 18 to Task 19
GSI
CERN