Technologies Harold Kirk Brookhaven National Laboratory February 19 2014 The Front End Technology Challenges Target Chicane RF for Buncher Rotator Ionization cooling MICECooling talks to follow ID: 578724
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Slide1
Front End Technologies
Harold Kirk
Brookhaven National Laboratory
February 19, 2014Slide2
The Front End
Technology Challenges
Target
ChicaneRF for Buncher/RotatorIonization cooling (MICE/Cooling talks to follow)
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
February 19, 2014
2Slide3
Technology Challenges
Target and Capture
3
GJ (15T, 2.4m ID ) superconducting solenoidShielding for SC coils surrounding the targetReplaceable Target Module (Solid or Liquid)Beam dump (splash mitigation if liquid target)
ChicaneField requirements (B ≥ 2T)
Shielding for SC coilsRF for Buncher/Rotator
325 MHz with 20 MV/m in B ≥ 2T field
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
February 19, 2014
3Slide4
Liquid Target System
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
February 19, 2014
4
4MW
Candidate
m
aterials:
Hg, Ga,
PbBi
Use of Ga results
i
n ~15% loss in
muon
productionSlide5
A Solid Target System
February 19, 2014
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
5
He-cooled W-balls shielding
Target ModuleSlide6
Solid Target Module
February 19, 2014
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
6
75 cm Carbon Rod
75 cm Carbon Beam Dump
1 MW
Candidate material:
Carbon
4 Interaction Lengths
1% unspent primary
proton beamSlide7
Drive Beam Energy Budget
The primary beam energy goes to:
~10% into the Target Module
~15% conduced downstream
~ 75 % into the volume immediately surrounding the target module
February 19, 2014
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
7Slide8
He Cooled Shielding
75% of beam power absorbed in target shield
Shielding concept:
97% pure Tungsten balls60% packing fractionHe gas flow cooled W and H2O are incompatible
Reduce activation products (e.g., tritium)
Thermal engineering required to establish feasibility
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
February 19, 2014
8Slide9
Liquid Target Issues
Jet delivery (Nozzle Design)
Splash Mitigation
20 m/s could cause significant disruption of the liquid in the collection systemPotential to disrupt particle productionChosen solution will need to be bench tested
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
February 19, 2014
9Slide10
Chicane
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
Push toward higher decay channel
B fields (≥2T) will require SC coils
A credible shielding
solution
will be needed
P. Snopok, IIT,FNAL
C. Rogers, RAL
February 19, 2014
10Slide11
Buncher/Phase Rotator
Require 325MHz, 20 MV/m, B ≥ 2T
Gradient corresponds to:
201MHz: 16 MV/m 805 MHz : 32 MV/m
MTA rso far: 805 MHZ, 20 MV/m, B=5T
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
February 19, 2014
11Slide12
Summary
Front End technical
c
hallenges include: Shielding for the target and capture solenoids Shielding solution for the chicane.The liquid delivery systemAn improved jet stream
Splash mitigation of the 20-m/s jet in the liquid collectorOperation of high-gradient 325 MHz cavities in fields B ≥ 2T
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
February 19, 2014
12Slide13
Backup Slides
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
February 19, 2014
13Slide14
15T Liquid Target Solution
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
February 19, 2014
14Slide15
Utility Connections for 15
T
System
Shielding
Helium
Remote
Handling
Features
Nozzle
Supply
Beam
Entrance
Vent
Mercury
Drains
Mercury
Vessel
Helium
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
February 19, 2014
15Slide16
Liquid Target System Core
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
He-cooled W-balls shielding
Splash mitigation
Hg
d
elivery system
February 19, 2014
16Slide17
MERIT Beam Pipe Simulations
Y. Zhan, Stony Brook
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
February 19, 2014
17Slide18
Free Jet Simulations
Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)
T = 16
ms
T = 111
ms
T = 180
ms
20 m/s Hg Jet in air
Results encouraging, but:
Nozzle is simple circular orifice
2D simulation—need 3D
February 19, 2014
18