Peter Spiller, DIRAC Kick-off meeting Peter Spiller Design Study Group DIRAC kick-off meeting...

Peter Spiller, DIRAC Kick-off meeting

Peter Spiller

Design Study Group

DIRAC kick-off meeting

13.4.2005

SIS100


SIS100 in FAIR


SIS 100 Project Overview

Accel. TDR (all device developments finished)

Device TRs

R&D phase Construction phase

Importance of the year 2008 !

Demonstration of the U28+ operation in SIS18 bevor series production of SIS100


TR Estimates - R&D Phase SIS100

TotalInvestments[M€]

Est.Personnel Involvement[FTE

Est.Personnel Involvement[M€]

Investment/Personnel[M€/FTE]

Investment+ Personnel[M€]

EUTotal expected[M€]

EURequestedBudget[M€]

System Planning 0.682 0.252

Magnets 3.405 - - 3.405 + x 1.7 0.733

Power Supplies 0.04 5.8 0.487 0.007 0.527

RF Systems 4.488 44.7 3.755 0.1 8.243 1.26 0.63

Injection/Extraction 0.37 3.5 0.294 0.1 0.664

Beam Diagnostics 3.26 42.7 3.586 0.076 6.846 1.141 0.272

Vacuum System 3.05 50.8 4.267 0.06 7.317 0.697 0.191

Insertions 0.05 10.2 0.857 0.005 0.907

Cryogenics 0.595 32 2.688 0.018 3.283

Safety and Machine Protection

0.075 4.5 0.378 0.017 0.453

Total 15.333 194 16.3 0.048 31.3 5.48 2.078


UHV:

ERDA Measurements

GSI, TU Darmstadt, LMU

Rf1:

Longitudinal feed back system

GSI, CERN

Rf2:

Fast high power switches for rf gaps

GSI, CERN

System Design:

High current beam dynamics studies

GSI, TU Darmstadt, LBNL, BNL, Uni Bologna

Beam Diagnostics:

Digital signal analysis electronics for BPMs

GSI, CERN, TU Darnstadt, Company Itech, FZJ

Magnets:

Fast ramped super conducting magnets

GSI, Company BNN, JINR, Company ACCEL

SIS100 : Subtasks and Participants


Pb55+

Pb54+X

loss≈ 104-105 !!!

loss109 Pb54+ (4.2 MeV/u)

Pb53+

stripping losses (U28+ :SIS100)

capture losses (dominate in SIS18/LEAR)

pressure bumps

Pb54+

beam loss induced desorption yield:

stripping

capture

Dipole magnet

<1o

ERDA - Advanced Materials and Coatings

R&D goal :

Materials for Accelerator Components and Structures e.g. Collimators, with Low Desorption Coefficient

Beam Losses caused by vacuum instability


Rf Gap Switch – Minimization of Cavity Impedances

R&D goal :

Development of a high power Rf gap switch for inductivily loaded cavities with a low impedance, for high image currents

SIS100 Rf Systems:

Number of Acceleration Cavities : 30 + 15

Number of Bunch Compression Cavities : 25

Preliminary parameters of a semi-conductor rf gap switch

switching time 1 s

max applied voltage 20 kV

max current 50 A

impedance 5 W

Only the Rf system required is visible for the beam

Options : MOSFET, IGBT, High Tc Superconducter


Damping of coupled bunch oscillations induced by unwanted higher order modes. Longitudinal feedback system consists of a dedicated RF kicker, which applies an energy correction, an electromagnetic kick, to a passing bunch. Damping of longitudinal oscillations around the synchrotron phase. To damp all the dipole mode oscillations, the kick force must change it‘s phase from a passing bunch to the next bunch. Thus half the bunch frequency is nessesary for the bandwidth of a longitudinal feedback kicker. Complex interaction during high current operation with broad band MA loaded cavity impedance

Longitudinal Feed Back System

R&D Goal :

Prototype longitudinal feedback system for damping of higher order mode bunch oscillations


High Current Beam Dynamics

Transverse Beam Dynamics : Nonlinear Lattice Properties

under Space Charge Influence

Collective Instabilities and Impedances : Definition of Impedance Budget

(„Impedance Acceptance“)

Analysis and Optimization of Device Impedances

Longitudinal Beam Dynamics : Simulation of high intensity beams including interaction

with realistic properties (e.g. impedance) of Rf systems

Definition of optimized Rf manipulations for single bunch

generation and compression

Franchetti et.al


Digital Signal Analysis Electronics for BPMs

Transition from analoge (different dedicated systems) to a digital (single), fully programmable BPM electronics for e.g.

a) high resolution beam position measurement (large beam fill factor) on the ms scale and

b) broad-band, turn-by-turn position measurement

Tests of the new electronics hardware in CERN PS

R&D goal :

4-channel 250 MS/s 12Bit analogue board with sufficient memory and a set of high performance algorithms implemented on the digital board


Fast Ramped Superconducting Magnets

Nuclotron Cable Nuclotron Dipole in Cryostat

Reduction of AC losses during ramping by improved iron yoke design 40 W/m > 13 W/m Bmax= 2 T, dB/dt= 4T/s, f= 1 Hz

Window frame magnet with superconducting coil

R&D goal: Mechanical and Structural R&D – New Coil Layout – Prototypes for Dipoles and Quadrupoles

Peter Spiller, DIRAC Kick-off meeting Peter Spiller Design Study Group DIRAC kick-off meeting...

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