C-870
ION SOURCE ASSEMBLY consists of Repeller plate, Extraction Grid,
Acceleration Grid, Einsel lenses and Steering Plates. It is designed
to protrude into the chamber approximately 6 inches from the face
of an 8 inch O.D. CONFLAT flange.
ANGULAR REFLECTRON D-850
Designed
for the researcher who requires higher resolution than can be
obtained using our linear instruments. Modular construction from
standard vacuum hardware makes custom variations or later modifications
easy. Although this type of
equipment is complicated in theory, it is mechanically quite simple
and easy to use. Reports indicate that our customers spent very
little time getting their systems up and running. Resolution of
1500 has been obtained without extensive tweaking or other techniques
to enhance initial performance. Resolution of over 4000 has been
obtained when used with our Shroud,
Skimmer, Pulsed Valve and Egun. Sensitivity has so far been good
with both pulsed beam and surface ablation experiments. This is
probably due to the use of high (1200V) drift velocities.
AREF Power Supply/Instrument Manual (PDF) Click
on link to open
To download, right click on link and "save target as".
Filesize: approx. 2 MB.
Manual includes power supply specs, wiring diagrams, and installation
procedure for the 40mm detector assembly.
D-850
AREF ASSEMBLY COMPONENTS
C-870
ION SOURCE ASSEMBLY consists of Repeller plate, Extraction Grid,
Acceleration Grid, Einsel lenses and Steering Plates. It is designed
to protrude into the chamber approximately 6 inches from the face
of an 8 inch O.D. CONFLAT flange.
C-854 OFFSET ADAPTOR ASSEMBLY
is the chamber to flight tube adaptor which provides the correct
offset from the Reflector centerline and serves as a mounting
base for the 40mm MCP Detector and its 50 ohm anode.
C-855 FLIGHT TUBE ASSY is 8 inch tubing with 10 inch O.D. CONFLAT flange on each end. It may have extra ports for access or supplemental pumping. An elevated potential liner can be provided if needed.
C-726 40mm DUAL MICROCHANNEL
PLATE DETECTOR is designed to handle the fast ion pulses provided
by the Angular Reflectron Time Of Flight Mass Spectrometer. 
The 40mm MCP Detector
mounted on the Offset Adaptor (C-854) has 50 ohm output and provides
high gain (10e6
to
10e7) with sub-nanosecond rise time.
The MCP Detector is fitted with an input grid. This presents a flat, field free plane to the incoming ions. It can be operated at ground or elevated potential as required. Two microchannel plates are used. Special configurations are available which use three plates for increased sensitivity.
Sub-assembly on shipping flange
If
not utilized in the reflectron configuration, 40mm MCP Detectors
can be mounted on a 6 inch or larger CONFLAT flange, baked and
pinched off in its own vacuum housing. For use in special applications
it can be easily modified to triple MCP,
post acceleration and other configurations. Materials of construction
are 304 Stainless Steel, Nickel, Aluminum and Alumina.
C-852 REFLECTOR ASSY is composed
of an Entry grid which is normally at ground or Flight Tube potential.
Behind this is the
first Repeller Grid, followed by several plates which give a uniform
repelling field. More plates are used than are actually required
in order to guarantee uniformity and prevent ion scattering and
loss of sensitivity. The last element is the Repeller Grid which
can run at reflection potential, or grounded to enable the ions
to pass through and be detected by the 18mm MCP Linear Mode Detector.
C-701
18mm MCP DETECTOR ASSY is mounted on a 6 inch O.D. CONFLAT flange
with 50 Ohm Anode. It is used to detect ions when the instrument
is used in the linear mode. It will also detect more energetic
ions which pass through the repeller while less energetic ions
are reflected.
D-803 AREF POWER SUPPLY is a single compact source for all the votages used to operate the D-850 Angular Reflectron. It comes complete with all the cables, and should curtail clutter in the vincinity of the experiment. All voltages are monitored by the same meter. A voltage is only displayed while its monitor button is depressed. Six individual voltage modules can be easily removed for replacement or servicing. They can also be replaced with modules of different polarity and/or voltage range.
Accessories
B-682 SHROUD AND SKIMMER FOR DIFFERENTIAL PUMPING can increase resolution as high as 4,000 when used with a supersonic jet.
C-872 MASS GATE is a steering plate located at the entrance to the flight tube. Used to reject unwanted species from the mass spectrum. Usually pulsed to stability after unwanted low masses have passed by, or, pulsed to instability before unwanted high mass ions have passed by.
The accuracy with which masses can be selected is limited by the mass separation which occurred between the ion source and mass gate, approxiamtely 250mm apart.
D-679 FLIGHT TUBE LINER/SHIELD is a 7 inch diameter rolled stainless steel cylinder which electrically isolates the ions from the ground potential of the flight tube. It is mounted to insulating spacers and can be easily removed. Screened openings allow improved conductance to the pumping sideport in the flight tube.
C-1551 SAMPLE PROBE AND LOAD
LOCK is a simple mechanism for introducing test samples without
breaking vacuum,
it was designed using standard parts for ease of maintenance.
The probe body is a polished 3/8" diameter stainless steel
rod. It is sealed with lightly lubricated Viton o-rings and passes
through a ball valve into the high vacuum. The valve is mounted
to the assembly by Swagelok fittings using TFE ferrules so that
everything can be taken apart and reassembled
easily.
Sample tips fit into a ¼" diameter socket in a TFE insulator on the end of the probe. This provides electrical isolation for applications such as MALDI where the tip is a part of the high voltage repeller plate. The customer can fabricate custom sample tips in special configurations. He can also design custom probe features such as heated tips as long as the diameter is the same.
The inlet can be pumped by membrane or ballasted rotary vacuum pumps. The latter will reduce the pressure in the dead volume to a low enough value to minimize the pressure surge in the chamber. This dead volume is small enough to operate with a rotary pump which is ballasted to 200 millitorr with dry gas. Although oil free, membrane pump baseline pressures are marginal so that it may be necessary to turn off all voltages in the chamber each time the inlet ball valve is opened. This also depends on the chamber pumping capacity.
The inlet can be furnished mounted to a flange or vacuum quick coupling. The flange must be machined at the time of assembly fabrication to assure smooth, leak free operation. Other flange features can also be machined at this time such as tapped holes, electrical feedthroughs and source elements.
Price List