Summary of activities 2009-2011 of the pellet target development A.Boukharov, M.Büscher, V.Chernetsky, P.Fedorets, A.Gerasimov

Pellet target activities in frame of HP2/FutureJet project

Study of H2 and N2 drop formation According to requirements from PANDA collaboration efforts to decrease pellet diameter and increase pellet frequency Activities: Production nozzles with smaller diameter Design and production new electronic channel for high frequencies for piezo generator Purchase and commissioning purifier Investigation temperature and pressure regimes Optimisation of the pellet target construction for more smooth and correct temperature distributions and minimization of needed cooling power

Results for H2 and N2 drop formation: nozzle diameter and frequency Year 2005-2008 2009 2010-2011 H2 and N2 15 - 40 mm 3 - 24 kHz 12 - 18 mm up to 60 kHz 5 - 12 mm 60 - 170 kHz

Results for H2 and N2 drop formation 2009 N2 nozzle diameter Ø 17 μm, f≈ 60 kHz

Results for H2 and N2 drop formation jet diameter ≤ 10 μm, f=181 kHz 2010, N2 jet diameter ≤ 7 μm, f=169 kHz

New sluices 2011, total length 120-125 mm Small part: external Ø = 1mm, internal Ø= 500-700 μm Big part: external Ø = 3 mm, internal Ø= 1.62 mm

Pellets from heavy gas – Ar droplet production Examples of Ar jets and droplets, Ønozzle=17μm, f<30 kHz

Investigation of the pellet beam parameters In frame of the task of measurement the parameters of the pellet flow we made following: Activities: Design and manufacture the new adjustment system for sluice-nozzle system Purchase and commissioning of two line scan cameras with lasers Design and production of skimmers Assembling 160 cm pipe line between cryostat and scattering chamber in order to model the PANDA configuration

New adjustment system More flexible connection between condenser and triple point chamber More flexible connection triple point chamber and sluice More accurate on-line adjustment sluice and nozzle positions.

New adjustment system - details Upper membrane keep condenser Lower membrane support sluice

Line scan cameras 3 diploma-students: Eric Jung, Robert Mitter, Johann Elis Activities: Purchase and commissioning of two line scan cameras with lasers Design and manufacture support for cameras and lasers Manufacture new scattering chamber New software for taking and storage data from cameras, for on-line and off-line analysis of spectra

Line scan camera Line scan camera AVIIVA UM2 resolution: 512 pixels pixel size: 14 μm maximum line rate: 98 kHz New scattering chamber for operation with line scan camera Pavel Fedorets Pavel Fedorets 13

Line Scan camera installation on the Pellet Target Assembling in test place in laboratory Line Scan Camera laser scattering chamber Pavel Fedorets

Pellet target layout with tube Skimmers: 1.0 and 0.6 mm

Target prototype Cryostat and vacuum chambers Transportation tube baths with liquid N2 and He triple point chamber Transportation tube vacuum chambers laser turbo pumps Line Scan Camera Pressure sensor turbo pumps scattering chamber

First results from line scan camera Image of 20 μm wire, laboratory test Brightness of cluster Size of cluster X position of cluster

First results from line scan camera Pellet flow on the outlet from sluice July 2011 (bad nozzle-sluice adjustment) Brightness of cluster Size of cluster X position of cluster Sluice diameter 700 μm

Activity in ILPP Duesseldorf Plan of test laboratory for pellet-laser investigations

Hydrogen pellets as target 2-D Simulations from the JSC Jülich Laser pulse with l=1 µm and fokus Ø =10 µm hits a 10 µm frozen H2 pellet maximum proton energy can further be increased (factor 4) by optimization of the focus size COSY injection energy

First step - measured proton spectra from foil targets

Experiments with water jets Study of the effect of deviation the jet from the vertical axis. Goal – define the boundary parameters at which the effect appears. Example of the effect with various water jet diameters Speed 2.5 m/s. Pressure 200 Pa

Experiments with water jets Pressure at which the deviation of the jet from a vertical begins. Diameter of the jet 50 microns Pa

Model for pellet target Temperature of drops in various chambers 1- Triple point chamber 3, 4 - vacuum chamber 2 - sluice 5 - transportation tube

Model for pellet target Change of drops radius in various chambers.

Model for pellet target Change of drops speed in various chambers.