News from the Cluster-Jet Target Ann-Katrin Hergemöller Westfälische Wilhelms-Universität Münster, Institut für Kernphysik PANDA Meeting Darmstadt, June 10th 2014 1 / 17
collimator skimmer insulation cold head drive step motor cold head chamber spherical joint skimmer/collimator chamber step motor drive cluster beam cold head insulation vacuum direction of chamber chamber vacuum Setup of the new Cluster Source 2 / 17
Setup of the new Cluster Source Support Frame 3 / 17
Setup of the new Cluster Source Support Frame Automatic lifting system → Last few centimetres per hand wheel 3 / 17
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 3 / 17
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 3 / 17
Laval nozzle Spherical joint Insulation vacuum chamber Skimmer/Collimator chamber Snap connectors Setup of the new Cluster Source 4 / 17
Laval nozzle Spherical joint Insulation vacuum chamber Skimmer/Collimator chamber Snap connectors Setup of the new Cluster Source Spherical Joint 4 / 17
Laval nozzle Spherical joint Insulation vacuum chamber Skimmer/Collimator chamber Snap connectors Setup of the new Cluster Source Laval nozzle 4 / 17
Laval nozzle Spherical joint Insulation vacuum chamber Skimmer/Collimator chamber Snap connectors Setup of the new Cluster Source Skimmer/Collimator chamber 4 / 17
Direction of Nozzle shutter cluster beam Skimmer 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 5 / 17
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 6 / 17
Vertical Setup Setup of cluster source in full PANDA geometry ⇒ Vertical setup ⇒ 2 . 1 m between cluster source and scattering chamber 7 / 17
Installation of further components Transition Vacuum Chamber Separates cluster target vacuum from HESR/PANDA vacuum 8 / 17
Installation of further components Transition Vacuum Chamber Offers camera ports for online cluster beam position and thickness monitoring Measurement principle at MCT1S target 8 / 17
Installation of further components Gas system and gas control target frame hydrogen purifier gas bottle storage vent vent vent V H5 V H7 V H3 V H1 mass flow delimiter 1 V P2 V P3 V H9 V H8 V H6 V H4 V H2 V P1 pressure mass flow H 2 -purifier controller meter H 2 - V P4 V P5 V H10 gas mass flow delimiter 2 filter N 2 - V P6 V H11 mass flow gas delimiter 3 p nozzle N 2 - ≈ 17 bar V P,noz V H12 gas V D1 mass flow controller temperature controller V C1 V P7 V H13 V H14 I nsulation V acuum TP 1 p VP1 p IVC C hamber ≈ 10 -6 mbar V P8 p RP1 V P9a VP 1 300 l/s 300 m 3 /h Laval nozzle RP 2 V P11a RP 1 V H15 V P12a V P9b S kimmer C hamber V P10a VP 2 p SC 7000 m 3 /h 2000 m 3 /h ≈ 10 -1 mbar 300 m 3 /h skimmer p RP2 cluster-jet source TP 2 V O1 V H16 V P12c V P12b V P11b V P10b C ollimator p VP2 2x 2000 l/s p CC C hamber TP 3 ≈ 10 -4 mbar O 2 sensor collimator V P,snap snap pumping station connector TP 4 p TVC T ransition V acuum ≈ 10 -5 mbar 2x 300 l/s C hamber TP 5 V P13 antiprotons vent 9 / 17
Installation of further components Gas system and gas control Different modules for H 2 and N 2 systems H 2 N 2 10 / 17
Installation of further components Gas system and gas control Different modules for H 2 and N 2 systems H 2 N 2 10 / 17
N 2 H 2 Transition vacuum chamber Cluster source Installation of further components Gas system and gas control Installation at target support frame 11 / 17
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 12 / 17
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 operation 13 / 17
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 ... 14 / 17
turbomolecular pump ccd camera ionised cluster beam e-gun MCP retardation field 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 15 / 17
1.6 1 0.25 0.125 0.0625 1 0.1 1.8 2 1.4 1.2 0.8 1 0.6 0.4 0.2 0 4 dN/dm / 10 −5 atoms −1 retardation potential / kV cluster size / 10 5 atoms 70 K, 11 bar 0.5 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 ⇒ 10 5 atoms Lower temperatures lead to higher masses 16 / 17
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 17 / 17
Installation of further components Snap Connectors Connection to the magnet vacuum system 17 / 17
Installation of further components Snap Connectors Connection to the magnet vacuum system 17 / 17
Installation of further components Snap Connectors Connection to the magnet vacuum system 17 / 17
Installation of further components Snap Connectors Connection to the magnet vacuum system 17 / 17
Installation of further components Snap Connectors Connection to the magnet vacuum system 17 / 17
Installation of further components Snap Connectors Connection to the magnet vacuum system 17 / 17
Installation of further components Snap Connectors Connection to the magnet vacuum system 17 / 17
Installation of further components Snap Connectors Connection to the magnet vacuum system 17 / 17
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