Download - RARAF Accelerator Replacement
RARAF Accelerator Replacement
• History of RARAF Van de Graaff
• Removal of Van de Graaff
• Placement and assembly of Singletron
• Comparison of accelerators
• Timeline for installation
RARAF Accelerator Replacement
Van de Graaff at Brookhaven National Laboratory 1949
RARAF Accelerator Replacement
Cosmotron Cosmotron injector
RARAF Accelerator ReplacementVan de Graaff at BNL before move to Nevis
RARAF Accelerator ReplacementVan de Graaff stored at Nevis and being positioned
RARAF Accelerator ReplacementNevis 200 MeV cyclotron partially disassembled and being entombed
RARAF Accelerator ReplacementVan de Graaff before removal
RARAF Accelerator ReplacementRemoving charging belt (June 13)
RARAF Accelerator Replacement
RARAF Accelerator ReplacementRemoval of acceleration tube
RARAF Accelerator Replacement
Terminal, acceleration tube and column removed
RARAF Accelerator ReplacementBaseplate with column and drive motor removed
RARAF Accelerator ReplacementMaking opening in rear wall
RARAF Accelerator ReplacementVan de Graaff tank being removed from building
(August 2)
RARAF Accelerator Replacement
RARAF Accelerator Replacement
RARAF Accelerator ReplacementRemoval of baseplate
RARAF Accelerator Replacement
RARAF Accelerator ReplacementAccelerator tank leaving Nevis
RARAF Accelerator Replacement
Interior parts of the Van de Graaff being taken away by Robert Krawchuk
RARAF Accelerator Replacement
Arrival of Singletron at RARAF (August 10)
RARAF Accelerator Replacement
RARAF Accelerator Replacement
Installation of baseplate and resonant coil tank
RARAF Accelerator ReplacementHV power supply & resonator coil
Singletron, baseplate & quadrupole
RARAF Accelerator Replacement
Interior of Singletron Terminal with shell removed
RARAF Accelerator Replacement
Parameter Van de Graaff Singletron
Terminal Voltage (MV) 0.8 - 4.2 0.2 - 5.0
Ripple (V) ~1200 200
Proton current (μA) >150 200 (100)
He current (μA) ? 125
Charging system Belt Induction
Note: Lower x-ray radiation in Singletron due to spiral acceleration tube design
Accelerator comparison
RARAF Accelerator ReplacementPrinciple of operation of a Pelletron or Van de Graaff
RARAF Accelerator Replacement
Singletron resonant coil interior Interior of tank with “Dees”
RARAF Accelerator Replacement
Electrodes & diode stacks with spark gaps
RARAF Accelerator ReplacementRF ion source
RARAF Accelerator Replacement
TASK From To
Mechanical installation (positioning, anchoring rails, etc.) 9/20 10/4
Wiring, water, ion source, function tests 10/5 10/7
Accelerator checks (open air) 10/10 10/14
INSTALLATION BREAK (1st 4 weeks over) 10/17 10/24
Tank filling and conditioning for voltage 10/25 11/2
HV test/ radiation check 11/3 11/4
Beam tests 11/7 11/11
Specification: voltage, stability, beam current 11/14 11/18
INSTALLATION BREAK (2nd 4 weeks over) 11/21 11/28
Return if necessary 11/29
Timeline for Singletron installation
RARAF Accelerator Replacement
RARAF Staff
Gerhard Randers-PehrsonAlan BigelowGuy GartyGreg RossGiusseppe Schettino
HVEE staff
Arnoud TerpstraRobert Honee