Peter Spiller, COLMAT-Kick off meeting, Cryo-Collimator, CERN, 17.6.09 COLMAT Kick-off meeting CERN...

Peter Spiller, COLMAT-Kick off meeting, Cryo-Collimator, CERN, 17.6.09

COLMAT Kick-off meeting

CERN

Peter Spiller

17.6.2009

Cryo-Collimator (Catcher)for FAIR SIS100 and LHC ?

Task 3


Ionization Beam Loss and Dynamic Vacuum

Main Issue for the SIS100 System Design:

Life time of U28+ is significantly lower than of U73+

Life time of U28+ depends strongly on the residual gas pressure

Ion induced gas desorption ( 10 000) increases the local pressure

Beam loss increases with intensity (dynamic vacuum)

Motivation


Optimized lattice for peaked distribution of ionization beam loss

Catcher system for ionization loss control with low desorption yield material

Strong distributed pumping system

(sufficient area and sufficiently cold (actively cooled) vacuum chambers)

Long term pumping after built up of stacks of monolayers (cryogenic surfaces)

Infinitely refreshable (e.g. in a shut downs)

Low systematic beam loss to prevent initial pressure bumps

Low initial static pressure with a small amount of heavy components

(warm sections determine the average, initial pressure)

Fast ramping and short cycle times (for a fast decrease of cross sections)

Intermediate Charge State Heavy Ion Operation

3

Motivation


Vergleich alle Lattices

55%

60%

65%

70%

75%

80%

85%

90%

95%

100%

1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2

Abstand von Strahlachse / n*R(k-v-Verteilung)

Ko

llim

atio

nse

ffiz

ien

z

CDR (TR_DFD_4Dipole3.0Grad2.0T_08_Ausgelagert)TR_DFD_3Dipole2.9Grad2.0T_09TR_DFD_3Dipole3.0Grad2.0T_09_AusTR_DFD_3Dipole3.0Grad2.0T_10_AusgelagertTR_FDF_3Dipole2.9Grad2.0T_09TR_FDF_3Dipole3.0Grad2.0T_09_AusgelagertTR_FDF_3Dipole3.0Grad2.0T_10_AusgelagertDOFO_2Dipole3.0Grad2.0T_17DP_DF_2Dipole3.0Grad2.0T_13_TuneDP_DF_2Dipole3.0Grad2.0T_13_AusgelagertDP_DF_2Dipole3.0Grad2.0T_13_Aus_TuneDP_DF_2Dipole3.0Grad2.0T_14DP_DF_2Dipole3.0Grad2.0T_14_TuneDP_DF_2Dipole3.0Grad2.0T_14_AusgelagertDP_DF_2Dipole3.0Grad2.0T_14_Aus_TuneDP_DF_2Dipole3.0Grad2.0T_15DP_DF_2Dipole3.0Grad2.0T_15_AusgelagertDP_DF_2Dipole3.0Grad2.0T_15_Aus_TuneDP_DF_2Dipole3.0Grad2.0T_15_Aus_T2DP_DF_2Dipole3.3Grad1.9T_13_AusgelagertDP_DF_2Dipole3.3Grad2.0T_13DP_DF_2Dipole3.3Grad2.0T_13_AusgelagertDP_DF_2Dipole3.3Grad2.0T_14DP_DF_2Dipole3.3Grad2.0T_14_AusgelagertDP_DF_3Dipole2.7Grad2.0T_11_AusgelagertDP_DF_3Dipole2.9Grad2.0T_11DP_DF_3Dipole2.9Grad2.0T_12DP_DF_3Dipole3.0Grad1.9T_11_AusgelagertDP_DF_3Dipole3.0Grad2.0T_11_AusgelagertDP_DF_3Dipole3.0Grad2.0T_12_AusgelagertDP_DF_3Dipole3.3Grad2.0T_11DP_DF_3Dipole3.3Grad2.0T_12DP_FD_2Dipole3.0Grad2.0T_15DP_DF_2Dipole3.0Grad2.0T_16_Aus_11/2_TuneDP_DF_2Dipole3.0Grad2.0T_16_Aus_11/2DP_DF_2Dipole3.0Grad2.0T_16_Aus_11/2_19_17DP_DF_2Dipole3.0Grad2.0T_16_Aus_11/2_28_16DP_DF_2Dipole3.0Grad2.0T_16_Aus_11/2_28_20

New lattice design for intermediate charge state heavy ion operation with ionization beam loss: Charge separator lattice

Catching efficiency has been compared for different lattice types as a function of the distance of the catcher from the beam edge (for U28+ > U29+)

Fraction of ions missing the catchers increases for lighter ion and multiple ionization

4

Motivation


Motivation

Desorption Catcher

Absorber wedge

Length m 0.6

Density kg/m3 8

Material Copper

Low desorption coating 100 nm Ni, 100 .200 nm Au

Temperature K 50 .. 100 K

Weight kg 2.3

Alignment tolerance mm 0.5

Heat release from the beam W < 10

Chamber

Aperture mm2 135 x 65

Chamber shape rectangular

Operation temperature K 4.5

Cooling power W 100

General

Length of module m 0.7

No. of modules per superperiod 8

Total no. of collimators 66

Design Concepts


Goals

Set-up of a prototype cryo-catcher with similar technical design

as finally used for SIS100

Installation of the prototype cryo-catcher at a HE Cave at GSI

and test with SIS18 heavy ions beams


Observable

Measurement of the pressure rise on the beam axis

Measurement of the amount of gas desorption and effective desorption yield

Measurement of the mass spectrum of the desorbed atoms

Measurement of the catcher temperature at different beam loads

Determination of the required cooling power at different beam loads

Beam position and number of ions


Simulation of Operation Conditions

ANSYS


Cost Estimate

Component/task Costs [k€]

External Design 40

Cryostat, heat schild, calt-warm-transition

100

Local cryogenics 100

UHV diagnostics (Mass spectr. Total pressure gauge etc.)

GSI

Temperature measurement GSI

Electronics GSI

Valves GSI

Beam Instrumentation

beam screen

GSI

Turbo pumps, valves GSI

Collimator 20

Sum 200 - 250

Personal: (cost equivalent)

1 Physicist

1 Engineer

for 3 years

Total cost: 600 k€

Equipment partially provided by GSI


Technical Set-up

Cryostat incl. heat shield and support with two cold-warm transitions for the connection to the HE beam transport system and a beam dump

Beam screen monitor and slow beam transformer

Catcher chamber with active cooling, temperature sensors, pressure gauges and mass spectrometer

Evtl. horizontal movable

Catcher, thermally insulated wedge and block with low desorption gold coating and temperature sensor

Pumping system for beam pipe and insulation vacuum


Design Considerations

Catcher head using low desorption material and coating

(Copper block with Gold coationg and Nickel diffusion barrier)


Design Considerations


WPS


Project Team

Lars Bozyk – GSI FAIR Synchrotrons Department

H. Kollmus – GSI UHV Department

CERN – contact ?

Collaboration: Igor Sekachev, TRIUMF

Task leader: P. Spiller – GSI FAIR Synchrotron Department

Peter Spiller, COLMAT-Kick off meeting, Cryo-Collimator, CERN, 17.6.09 COLMAT Kick-off meeting CERN...

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