1. 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

2. Optical diagnostic system and nozzle position aligment
Proposed linear actuators:
MDC Vacuum BLM (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 x1032 pixels
Min exposure: 7 μs
Dynamic range: 12 bit
Sync by external trigger
The lens Sigma DG APO Macro
180 mm f/ 2.8

3. 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

4. Heater control unit Microcontroller based, two channels,
based on ICPDAS industrial modules
Controlled from sensor LCD panel or from PC
Scheme for 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

5. 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)

6. 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

7. 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

8. Velocity measurement of flyer pellets
first results with CCD SDU 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

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

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

11. 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

12. 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

13. 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.

14. 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

15. 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