Status of the pellet target at ITEP Alexey Kantsyrev, A.Gerasimov, V.Chernetsky, P.Fedorets, V. Panyushkin, A. Bogdanov, A.Dolgolenko, P.Balanutsa, L.Gusev, S.Mineev, S.Podchasky, I.Tarasenko, V. Demekhin, S.Makagonov, D.Bogachenko, N.Kristi, V.Karasev Institute for Theoretical and Experimental Physics named by A.I. Alikhanov of National Research Centre «Kurchatov Institute» Moscow, Russia PANDA Meeting, Novosibirsk, September 04-08, 2017

Optical diagnostic system and nozzle position aligment Proposed linear actuators: MDC Vacuum BLM-133-1-03 (UHV motorized linear actuators) Movement by stepper motors, 3 µm linear steps Onitex OSM-42R controller Digital CCD camera SDU-285 (~0.5 kEuro) CCD sensor: SONY ICX285AL 1392x1032 pixels Min exposure: 7 μs Dynamic range: 12 bit Sync by external trigger The lens Sigma DG APO Macro 180 mm f/ 2.8

Data acquisition system for target Gas flow control Remote controlled system via TCP/IP sockets Delphi XE2 language software for Windows PC Temperatures Heater control Pressure

Heater control unit Microcontroller based, two channels, based on ICPDAS industrial modules Controlled from sensor LCD panel or from PC Scheme for 0-500 mA current control of wire heater (0-100 Ohm) C language software for μPAC7186 microcontroller Delphi XE2 language software for Windows PC Communication via Ethernet LAN Logging of parameters at hard disk or in MySQL database

Piezo generator Signal generator Rigol DG4202 Signal to piezo rings : Amplitude: up to ±100 V Frequency up to 1 MHz Delphi XE2 software Signal amplifier TABOR El. 9100 Piezzo Ring (installed on to holder of nozzle)

Light signals obtained by Hamamatsu R760 photomultiplier LED backlighter Parameters MOSFET driver scheme Powerful LED LUXEON V-Star (800mW) Min exposure: 100 ns Power supply 30 V 100 ns 270 ns Light signals obtained by Hamamatsu R760 photomultiplier

Tests with Hydrogen results with CCD SDU-285 camera + LED backlighter Droplets inside the channel of gateway 465 kHz Nozzle Ø 30 μm, droplets Ø ≈ 50 μm Exposure: 400 ns (LED backlighter Luxeon V-Star LXHL 700 mW) Frequency to piezo ring 465 kHz Regular tests, 6-8 hours every day during two weeks

Velocity measurement of flyer pellets first results with CCD SDU-285 + LED backlighter+Stanford DG645 Generator Exposition 400 ns Exposition 1600 ns Stretching of image of pellet due to longest exposition Meaured velocity is about 25 m/s LED backlighter Frequency to piezo ring 465 kHz

Nozzle and gateway position determination Gateway angle: 86.14 ° Nozzle angle: 83.64 ° Images: TIFF file 12 bit (1392x1032 pixels) Precessing: Python Software

Nozzle and gateway position determination Hough transform algorithm for nozzle position determination

Optical telescope for pellets diagnostic Goal of the first tests – selection of the optics and getting of the images of jet and droplets with high spatial resolution distilled water nozzle optics LED CCD camera

Tests of telescope with water stand ~2.5 μm/pixel Need to improve up to 0.1 μm/pixel Nozzle ≈ 64 μm, (left photo) jet Ø ≈ 70 μm and droplet Ø ≈ 128 μm CCD camera exposure: 300 ns

Phase Doppler Interferometer Preparation for the tests: The test facility with water was assembled and tested for leakages. This stand allowed to establish the necessary equipment to create the interferometric pattern in the area of flight of the droplets. Goal: measurement of the velocity and the size of the pellet.

Designed stand at MEPHI with a laser Doppler interferometer mount the nozzle The laser power supply Water layout focused laser beams on a water jet power supply PMT the lens for focusing the laser beams oscilloscope Optical system collimator for receiving the signal

Summary Stable pellet generation in 6 hours every day during two weeks Shadowgraphy diagnostic system was developed and tested (plan to produce six diagnostic axes) Data acquisition system for target setup was developed (plan to test and storing all data to MySQL database) New heater control unit was developed and tested (plan to set PID regulation for triple point parameters (T, P)) High resolution optical system – in development Phase Doppler Interferometer – in development