Communications & Power Industries, Inc.
Beverly Microwave Division
150 Sohier Road
Beverly, MA 01915-5595
Telephone (978)922-6000
Fax (978)922-8914
www.cpii.com/bmd
HeatWave Model VIA-301
Data Sheet
(September 2004)
General Description
This HeatWave generator system uses a
CPI manufactured Gyrotron, designed for
industrial/scientific service, as the energy
source. By using the 28-GHz, 10 kW CW
Gyrotron in combination with modern
control and power-supply technology, CPI
is able to furnish a compact, user-friendly,
cost-effective
microwave
generator
system.
The system’s control center employs an
embedded microprocessor, which provides
flexibility in selecting system operating
parameters. Operation can be initiated by
a simple “on” command. A fully manual
operation is included as well. Provisions
are included to permit remote operation
and monitoring via RS-232 and/or
Ethernet connection.
VIA-301 HeatWave Generator
Computer shown is optional
By using a switch-mode power supply to
provide the beam power for the Gyrotron,
this system achieves low power-supply
ripple without using large filter capacitors,
thereby eliminating the need for a costly crowbar to protect the Gyrotron. The compact power supply
makes it possible to offer a system housed in a single three-bay cabinet approximately 1.8 meters wide,
1.0 meters deep and 2.0 meters high weighing approximately 1,300 kg.
HeatWave Model VIA-301 Data Sheet
September 2004
Page 1 of 4
INSTRUMENTATION AND CONTROL
All operating, and control functions will be performed by the control-center. Critical interlocks, such as
those required for system or personnel safety are hard-wired.
CABINETRY
The system is installed in a standard three-bay cabinet as shown in the VIA-301 HeatWave Generator
Picture on page 1.
WAVEGUIDE SYSTEM
The Gyrotron oscillates in the TE
02
mode at 28 GHz. To provide low loss, the output waveguide is
oversized (1.281 inch - 32.5 mm inside diameter). The use of oversized waveguide results in
overmoded operation. Fourteen TE and ten TM modes can propagate in WRC621D14 at 28 GHz. As
long as the Gyrotron output is connected to a straight WRC621D14 guide the output will be in excess of
95% TE
02
single mode. Bends or perturbations in the waveguide will cause conversion to other modes
unless carefully designed. The directional coupler is designed to respond to only the TE
02
mode so that
unambiguous measurements can be made in systems with significant non TE
02
reflected energy. While
the Gyrotron is not harmed by reflected TE
02
energy, TE
21
and TE
11
reflections can cause damage to the
tube structure from overheating. CPI offers a mode absorber to protect the Gyrotron where such
reflections are expected.
For systems that use other than a multimode cavity applicator, CPI offers the system designer
waveguide and applicator components, such as low-mode-conversion waveguide bends, focusing
mirrors, arc-detectors and barrier windows. A converter from TE
02
to TE
01
mode is a standard product
and efficient converters to other modes can be supplied.
Physical Description
The HeatWave generator has internal fans that are provided to cool certain internal components and
there are vents in the cabinet to allow a flow of cooling air through the cabinet. The cabinet is designed
to allow the HeatWave to be moved with a forklift or pallet jack for initial placement in the laboratory
where it will be used.
It is advisable to level and secure the unit once the final location has been established. The HeatWave
generator should be evenly supported at its base for proper load distribution.
RF Output
The RF output waveguide connection is brought out through the top or side or front or back of the
cabinet on the left end of the HeatWave system. Care should be exercised when connecting the
waveguide run to avoid stresses on the output flange. The mating assembly should be aligned in all 3
axes prior to the flanges being bolted or clamped together.
CAUTION
Foreign material and moisture in the waveguide can cause destructive arcing. Whenever a waveguide
joint is opened, take extreme care to keep foreign material and moisture from entering the waveguide.
HeatWave Model VIA-301 Data Sheet
September 2004
Page 2 of 4
VIA-301 Physical Features
Safety Features
Strong magnetic fields are present inside the unit. However, there is sufficient shielding in the system to
reduce the strength external to the cabinet to safe levels. The panels on the cabinet are interlocked for
personnel safety. If any panel is removed the shunt-trip main circuit breaker will disconnect the
HeatWave system from the prime power source.
An EMERGENCY OFF button is mounted in the center bay of the system. Pushing this button
energizes the main circuit breaker shunt trip coil, which removes all power from the HeatWave. There
are provisions for the user to connect additional emergency off button-switches to the HeatWave system.
Since the push-button activates the main circuit breaker shunt trip circuit, approximately 50 to 100
milliseconds are required for power removal after the button is pushed.
The HeatWave includes protection necessary to cope with internal faults as well as operator errors
pertaining to the HeatWave operation. It also includes protection of the generator from arcs generated
in the external waveguide system as well as from excessive reflected energy from the external
waveguide system.
HeatWave Model VIA-301 Data Sheet
September 2004
Page 3 of 4
The HeatWave generator includes provision for external interlocks to remove gyrotron beam voltage.
The purpose of the external interlocks is to ensure that the user’s system safety interlock turns off the
generator if a hazardous situation arises. Hardwired shutdown logic sends a command to turn off the RF
in a few tens of milliseconds after receiving the command.
Specifications
Electrical
Power Input Requirements
(customer provided)
Output (microwave)
·a. Output power (CW)
b. Frequency
c. Output connection
External energy leakage
·a. Microwave
b. DC magnetic fields
c. Acoustic Noise
d. X-ray
480Y277 ±10%, 3-phase, 50/60Hz, 5-wire (3 phase-wires plus
neutral and ground). 70 A AC maximum line current per phase.
(Other voltages and frequencies available on special order.)
10 KW minimum at the HeatWave output waveguide flange
28 GHz nominal
EIA WRC621D14 waveguide
Less than 2 milliwatts/cm
2
(Measured with a Narda 8712 meter
and 8721D probe – or equivalent)
Less than 0.5 Gauss outside the cabinet wall
Less than 85 db at one meter while operating at full power
(Measured with a Quest Electronics model M27 or equivalent)
Less than 0.1 mr/hour (measured with a Victoreen Model 440RFD
X-ray Monitor or equivalent) outside the cabinet wall
Two normally closed, hard wired circuits
Environmental
+1°C to 65°C with water in the internal HeatWave cooling system.
-15°C to 65°C without water in the internal HeatWave cooling
system.
+10°C to 40°C
15 US Gallons per minute minimum flow rate. Pressure drop
across the HeatWave cooling system is 70 Pounds per Square Inch
maximum at that flow condition.
+15°C to +30°C with full RF operation.
99% maximum (non-condensing)
Sufficient for international shipment
Electrical Interlocks
Storage air temperature
Operating air temperature
Cooling water flow/pressure
Cooling water inlet temperature
Humidity
Shock and Vibration
HeatWave Model VIA-301 Data Sheet
September 2004
Page 4 of 4
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