Tuesday, May 29, 2007
Highest RF peak power - 29th of May
Today we reached the highest peak power of RF. We measured 6.8 MW of RF. We hope to increase this soon to 10 MW by tuning all the parameters.
RF pulse from 2157A Klystron - 25th of May
In the figure you see the RF pulse (2998.5 MHz) produced by the 2157A Klystron. The modulator (ScandiNova AB) was operated at 165 kV, 4.9 us FWHM and 63 Hz. This is at full power level of 6.3 kW average power.
We have driven the input of the klystron at a low power (estimated at 2.5 W peak power, which is a tenth of the optimal power).
The output level measured by the RF diode detectors corresponds to 2.5 MW peak power. This corresponds to a small signal gain of +60 dB.
We have driven the input of the klystron at a low power (estimated at 2.5 W peak power, which is a tenth of the optimal power).
The output level measured by the RF diode detectors corresponds to 2.5 MW peak power. This corresponds to a small signal gain of +60 dB.
Friday, May 25, 2007
High Power RF Test - 23th of May
We have performed the first high power RF tests in May.
The RF setup is orginized in the following way:
- The output of the RF source, Phase-Locked Loop (PLL) Synchroniser, is fed to the 100-W continuous RF amplifier, MAL tld..
- Inside the PLL a RF switch is integrated at the output, so that we can produce a low power (13 dBm) RF pulse of tens of microsecond in duration.
- The MAL amplifier (type AM82-3S-45-50R) has a small signal gain of 41 dB and has a output maximum of 50.2 dBm.
- The output of the MAL amplifier is fed to the input of the Klystron Tube. The klystron tube has a small signal gain of 57 dB.
- At the output of the Klystron Tube the waveguide section (WR284) is mounted, which contains a circulator with load (Ferrite SC3-118), bi-directional coupler and RF pressure window (CPI VWX-1053) at the accelerator cavity.
- To the bi-directional coupler RF diode detectors (Agilent 423B) are connected to monitor the forward and reflected RF power.
In this test phase the RF pressure window is replaced by a reflection plate, so that all the RF power is dissipated in the RF load on the circulator.
In the control room we have placed all the measurement equipment: two puls generators to supply the trigger pulse for the modulator and RF switch inside the PLL Synchronizer. The signals are displayed on a oscilloscoop.
For the computer in the control room the modulator can be controlled and all the operating parameters can be monitored.
The RF setup is orginized in the following way:
- The output of the RF source, Phase-Locked Loop (PLL) Synchroniser, is fed to the 100-W continuous RF amplifier, MAL tld..
- Inside the PLL a RF switch is integrated at the output, so that we can produce a low power (13 dBm) RF pulse of tens of microsecond in duration.
- The MAL amplifier (type AM82-3S-45-50R) has a small signal gain of 41 dB and has a output maximum of 50.2 dBm.
- The output of the MAL amplifier is fed to the input of the Klystron Tube. The klystron tube has a small signal gain of 57 dB.
- At the output of the Klystron Tube the waveguide section (WR284) is mounted, which contains a circulator with load (Ferrite SC3-118), bi-directional coupler and RF pressure window (CPI VWX-1053) at the accelerator cavity.
- To the bi-directional coupler RF diode detectors (Agilent 423B) are connected to monitor the forward and reflected RF power.
In this test phase the RF pressure window is replaced by a reflection plate, so that all the RF power is dissipated in the RF load on the circulator.
In the control room we have placed all the measurement equipment: two puls generators to supply the trigger pulse for the modulator and RF switch inside the PLL Synchronizer. The signals are displayed on a oscilloscoop.
For the computer in the control room the modulator can be controlled and all the operating parameters can be monitored.
Upper: PLL Synchronizer, Lower: MAL RF Amplifier |
N-type Coax cable connected to RF input of Klystron Tube. |
Bi-directional coupler in waveguide section. RF diode detectors connected to forward and backward outputs. |
Trigger signal generation and signal analyzing in control room. |
Control computer in control room. |
Red warning light indicates accelerator operation. |
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