Digital Signal Analysis for BPMs

pancakesbootAI and Robotics

Nov 24, 2013 (3 years and 8 months ago)

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EU Design Study

Kickoff Meeting GSI 15.4.05

U. Raich CERN AB/BDI

Digital Signal Analysis for BPMs


The Project


Measure beam trajectories and orbits in
hadron machines


Specific problems: Varying revolution
frequency, changing harmonic number


The Principle


Fast digitization, signal treatment on the fly

using FPGA and big memory



EU Design Study

Kickoff Meeting GSI 15.4.05

U. Raich CERN AB/BDI

Block Diagram of Electronics

Amplifier

+

shaper


PU

RAM

Fast

Sampling

ADC

Δ
x

FPGA

controller

Communication to accelerator

Control system

Σ

Δ
y

EU Design Study

Kickoff Meeting GSI 15.4.05

U. Raich CERN AB/BDI

Digital Signal Analysis for BPMs

GSI SIS18


CERN PS

EU Design Study

Kickoff Meeting GSI 15.4.05

U. Raich CERN AB/BDI

Project History (Pre
-
Phase)


End 2003: First ideas, CERN contacts with
Instrumentation Technologies (IT)


Jan 2004: R&D contract of CERN with IT

delivery of prototype Libera electronics (pre
-
version)


GSI had similar plans, decided collaboration


March 2004: Andreas Galatis as PhD student hired by
GSI


June 2004: CARE
-
HHH
-
Workshop on Hadron BPM
signal treatment in Aum
ü
hle (Hamburg)


Mid July 2004: Visit to IT

(Jeroen Belleman, CERN)


Measurements on CERN PS with fast ADC card + PC

EU Design Study

Kickoff Meeting GSI 15.4.05

U. Raich CERN AB/BDI

Project History


(Pre
-
Phase) II


Measurements on GSI SIS18 with fast ADC card + PC


Oct 2004: Collaboration Meeting GSI + measurements
with Libera and fast ADC + PC


Some problems on pre
-
version Libera were solved
(trigger), some remained (memory access)


Nov. 2004: Measurement on CERN PS, Libera pre
-
version works ok as fast chart recorder


From Nov 2004 to now: Data evaluation + development
of signal processing algorithms (base line correction,
bunch synchronisation).

This is done offline (C
-
programs)

EU Design Study

Kickoff Meeting GSI 15.4.05

U. Raich CERN AB/BDI

Going on at the moment


At CERN a “market survey” + tender is needed in order
to get acceptation by council.


Continued work on offline signal processing algorithms
at CERN and GSI in collaboration with TU Darmstadt


First tests on implementation in the FPGA using VHDL
simulation on measured data


Hiring of a technical student (M. Stuckert) at CERN for
the implementation work, hiring a technical engineer (K.
Lang) at GSI.

EU Design Study

Kickoff Meeting GSI 15.4.05

U. Raich CERN AB/BDI

Work Plan


Next WP meeting mid
-
May in Slovenia (IT)


Until October 2005: Refinement of algorithms,
implementation in VHDL + simulation, timing checks,
interfacing to IT’s VHDL code


End 2005: Another measurement session using online
signal treatment at GSI (2006: CERN)


(CERN) Tender for acquisition of 50 digital treatment
electronics cards/boxes.


2006: Definition of data layout in memory, interfacing to
the accelerator control system at CERN


Installation and commissioning of final system at PS