News from the Cluster-Jet Target Ann-Katrin Hergemller Westflische - - PowerPoint PPT Presentation

News from the Cluster-Jet Target

Ann-Katrin Hergemöller

Westfälische Wilhelms-Universität Münster, Institut für Kernphysik

PANDA Meeting Darmstadt, June 10th 2014

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Setup of the new Cluster Source

skimmer chamber chamber direction of insulation vacuum cold head cluster beam step motor drive spherical joint collimator chamber cold head step motor drive cold head insulation vacuum skimmer/collimator chamber

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Setup of the new Cluster Source

Support Frame

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Setup of the new Cluster Source

Support Frame

Automatic lifting system → Last few centimetres per hand wheel

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Setup of the new Cluster Source

Support Frame

Automatic lifting system → Last few centimetres per hand wheel Safety arrangements → End switches prevent any action while frame is locked

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Setup of the new Cluster Source

Support Frame

Automatic lifting system → Last few centimetres per hand wheel Safety arrangements → End switches prevent any action while frame is locked Mounting points to the magnet → Adjustable in all directions

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Setup of the new Cluster Source

Laval nozzle Spherical joint Insulation vacuum chamber Skimmer/Collimator chamber Snap connectors

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Setup of the new Cluster Source

Laval nozzle Spherical joint Insulation vacuum chamber Skimmer/Collimator chamber Snap connectors

Spherical Joint

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Setup of the new Cluster Source

Laval nozzle Spherical joint Insulation vacuum chamber Skimmer/Collimator chamber Snap connectors

Laval nozzle

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Setup of the new Cluster Source

Laval nozzle Spherical joint Insulation vacuum chamber Skimmer/Collimator chamber Snap connectors

Skimmer/Collimator chamber

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Setup of the new Cluster Source

Skimmer & Collimator chamber – xy-tables

Skimmer and collimator installed on xy-table ⇒ position adjustable Adjustment via two stepper motor devices Electrical installation ongoing

Nozzle shutter Direction of cluster beam Skimmer

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Setup of the new Cluster Source

Skimmer & Collimator chamber – Camera ports

Two camera ports on opposite sites Different objective lenses offer possibility to see:

Nozzle, beam and skimmer (f = 28 mm) Detailed view of beam and skimmer tip (f = 100 mm)

f = 28 mm f = 100 mm

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Vertical Setup

Setup of cluster source in full PANDA geometry ⇒ Vertical setup ⇒ 2.1 m between cluster source and scattering chamber

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Installation of further components

Transition Vacuum Chamber

Separates cluster target vacuum from HESR/PANDA vacuum

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Installation of further components

Transition Vacuum Chamber

Offers camera ports for online cluster beam position and thickness monitoring

Measurement principle at MCT1S target

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Installation of further components

Gas system and gas control

H2- gas VP1 VP2 VP9a VP10a RP1 VP11a RP2 pVP2 pVP1 VP12a pRP2

Skimmer Chamber Collimator Chamber

TP1 TP2 TP3

Laval nozzle skimmer collimator

VP8 VP6 VP13 vent VP1 H2-purifier pressure controller mass flow meter VP2 pIVC pSC pCC pTVC VO1 ≈ 10-1 mbar ≈ 10-4 mbar ≈ 10-5 mbar

≈ 17 bar

pnozzle ≈ 10-6 mbar TP4 TP5 300 m3/h 300 m3/h 2000 m3/h 7000 m3/h 300 l/s 2x 2000 l/s 2x 300 l/s

cluster-jet source antiprotons

VP5 temperature controller

Insulation Vacuum Chamber

pRP1 VP12b VP11b VP10b VP9b VP12c VH10 VH1 VH2 VH3 VH4 VH5 VH6 VH7 vent mass flow delimiter 1

Transition Vacuum

VH8 VH9 VH11 VH14 VH15 VH16 VP3 VP4 N2- gas VH13 N2- gas filter

Chamber pumping station hydrogen purifier target frame gas bottle storage

vent O2 sensor mass flow controller VP7 VP,snap VP,noz VD1 VC1 vent VH12 mass flow delimiter 2 mass flow delimiter 3 snap connector

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Installation of further components

Gas system and gas control

Different modules for H2 and N2 systems H2 N2

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Installation of further components

Gas system and gas control

Different modules for H2 and N2 systems H2 N2

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Installation of further components

Gas system and gas control

Installation at target support frame

N2 H2 Transition vacuum chamber Cluster source

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Installation of further components

Scattering Chamber & Beam Dump

Setup of a scattering chamber including a scanning rod system Installation of a provisional beam dump ⇒ Test of cluster beam properties at PANDA interaction point in 2014

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Setup of the cluster target − → Next steps in 2014

Final mounting of skimmer/collimator xy-tables and electrical installation Integration of snap connectors & transition vacuum chamber ⇒ Final Setup of the cluster source Setup of the onboard gas system Installation of the final pumping station in the new laboratory ⇒ Integration with the cluster source Installation of vertical beam pipes Setup of scattering chamber and beam dump Setup of final electronic rack & (temporary) slow control system for test

• peration

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Setup of the cluster target − → Implementing & Tests

Tests of the vacuum conditions Test of mounting system Test of the slow control requirements Gas supply requirement tests Investigation of the target thickness Determination of the best settings of skimmer, collimator and spherical joint Long term beam stability tests Test of different Laval nozzles ...

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Further Studies

Mass Measurements with MCPs

Mass measurements at the target prototype (E. Köhler) Cluster beam ionised by an e-gun Clusters are stopped by a retardation field

ccd camera turbomolecular pump ionised cluster beam e-gun MCP retardation field

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Further Studies

Mass Measurements with MCPs

Measurement of transmission spectra Stopping of light clusters successful (retardation field ≤ 4 kV) Cluster mass described by log normal distribution Measurements between 50 − 80 K, 7 − 12 bar ⇒ 105 atoms Lower temperatures lead to higher masses

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 0.1 1 0.0625 0.125 0.25 0.5 1 2 4 dN/dm / 10−5 atoms−1 retardation potential / kV cluster size / 105 atoms

70 K, 11 bar

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Summary & Outlook

Status of the Cluster-Jet Target for PANDA

Design and construction of complete cluster target ongoing

Cluster source integrated in support frame Skimmer/collimator xy-tables ready for mounting Setup of gas system ongoing Construction of transition vacuum chamber Construction of scattering chamber and beam dump

⇒ Implementing and tests

Further Studies

Investigations on the cluster mass with MCP’s Determination of the cluster size by Mie-scattering

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Installation of further components

Snap Connectors

Connection to the magnet vacuum system

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Installation of further components

Snap Connectors

Connection to the magnet vacuum system

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Installation of further components

Snap Connectors

Connection to the magnet vacuum system

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Installation of further components

Snap Connectors

Connection to the magnet vacuum system

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Installation of further components

Snap Connectors

Connection to the magnet vacuum system

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Installation of further components

Snap Connectors

Connection to the magnet vacuum system

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Installation of further components

Snap Connectors

Connection to the magnet vacuum system

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Installation of further components

Snap Connectors

Connection to the magnet vacuum system

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