SIS 186 Charge Separator W. Barth

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SIS 18-6 Charge SeparatorW. Barth
L. Heyl, J. Glatz, M. Kaiser, Ch. Will ...

• Introduction
• Present Charge Separation System
• Advanced Beam Dynamics Layout
• Technical Layout
• Project Status
• Modified working plan
• Manpower, Costs

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The GSI UNIversal Linear ACcelerator
Single Gap Resonators
High Current Injector
Alvarez
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Transfer Line to the SIS 18
Single Gap Resonators
Charge State Analysis
to SIS 18
Foil-stripper
FAIR 40 emA (1490 kW)
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Present Charge Separation System

• Stripper-system consisting of 3 pathways
• 25m space charge dominated beam transport for the
  stripped beam (multi charge state beam) leads to
  significant emittance growth
• Charge analyzing system (11?-dipole) with a
  resolution of 1.5 is sufficient for low
  intensity beams with only small emittance areas
• Difficult beam optimization for transport from
  the stripper to the charge separation.

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New Charge Separator-Concept

• Compact (6m) system of four vertical 35?-1.6
  T-dipole magnets (field homogeneity ? 1.5 )
• Sufficient for pulse operation 3 Hz pulsed mode,
  5 Hz demand mode
• Dipole chamber with low eddy currents in pulse
  operation, copper walls and apertures for low
  radioactivity from the impact of unwanted charge
  states, cooling and protection from thermal
  stress
• Stripper-system integrated
• Short (space charge dominated) beam transport
  (multi charge state beam) 1m
• less emittance growth
• Intensity gain inside SIS-acceptance ?? 20
• Charge-resolution 1
• Improved beam operating

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Stripper Concept with (more than) 3 Pathways
Foil exchanger (20 stripper foils)
1. 2. 3.
Low Current Operation
High Current Operation
No Stripping
High Current Operation (FAIR)
Quadrupole
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New Charge Seperator Beam Dynamics I
horizontally
Stripper Foil for high current heavy ion
operation (sweeper)
... for medium current operation (sweeper)
Kicker 2
... for low current operation (kicker)
Sweeper 2
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New Charge Seperator Beam Dynamics II
vertically
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New Beam Diagnostics Test Bench
profile grid
quadrupole duplett
hor./vert. slit
h/v-steerer
beamdump

• ion current
• beam profile
• position (correction)
• beam emittance
• bunch structure (non destructive)
• beam energy

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Technical Layout/Overview
no change
no change
reused components
beam transformers phase probes
(double-) kicker 3
kicker 2
beam dump
quad-doublet
dipole 34
dipole 12
beam diagnostic boxes (emittance measurement)
beam diagnostic box (profile grid, analyzing slit)
steerer
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list of components
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Status/component list
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Dipole magnets

• 01/2006 specification
• 02/2006 call for tender
• 04/2006 ordering
• 12/2006 delivery to GSI

segment (for dipole 1)
dipole 3
dipole 4
dipole 2
dipole 1
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Dipole chambers
water cooling
copper layers
copper layers
copper layers
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Technical Layout
Charge separator system
New beam diagnostics test bench
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Project Status
Components
cooling water (esimated for LASEPbeam
diagnostics bench)

• advanced beam dynamics fixed
• new beam diagnostics test bench design/techn.
  layout
• dipoles ordered
• most of the components in house/ordered
• dipole chamber (specs, call for tender,
  ordering) 2007
• carriage system (specs, call for tender,
  ordering) 2007
• preparation of controls system

• additional beam diagnostics defined, partly
  ordered
• technical layout/drawings of the whole beam line
• shutdown planning 2007
• planning of infrastructure (media, cable)
  started
• no show stoppers

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Working Plan
(pre-)assembly of the complete charge separator
Insertion in the transfer line
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Investment, personnel

• steerer (24 k)
• phase probe (5 k)
• SEM-grid (11 k)
• High current slits (23 k)
• techn. layout/ext. (15 k)

(basic approach 465 k)
EU-personal hired

• techn. (3Y), 01/03/2006
• eng. (3 Y/50), 01/02/2006

GSI-personal - scientist (50 ) - task
5/senior scientist (temporarily)
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Beam Dynamics III
Emittance Growth
L. Groening
Charge Separation