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B.71 Rulbus Pulser (W-band version)

Module name: rb_pulser_w

Additionally required modules: rs_sml01 if RF pulses are to be used.

Description: Pulser used for the W-band spectrometer in Leiden, using the Rulbus (Rijksuniversiteit Leiden BUS) - requires Linux device driver and library that are part of the fsc2 package). This pulser isn't a normal stand-alone device but consists of a combination of (currently) 15 Rulbus RB8514 delay cards and 2 clock cards (one fixed frequency 100 MHz card and a RB8515 card with adjustable frequency) as well as requiring the Rohde & Schwarz SML01 synthesizer (with the SML-B3 option) in order to be able to create RF pulses.

The timebase of this pulser is at the moment fixed to 10 ns, but this can be changed by using a second adjustable clock card and a modification of the configuration file for the pulser. Its number of functions is restricted to MICROWAVE, RADIO_FREQUENCY, DETECTION, LASER and DEFENSE. Only a maximum of three active microwave pulses is possible and only a single active RF, Laser, DETECTION and DEFENSE pulse.

Moreover, the DETECTION pulse can be only switched on or off by setting its length to either the length of the pulsers timebase or to 0 s - the end pulse of the card for the DETECTION pulse is to be used as the detection pulse and end pulses can only be switched on or off. Per default the DETECTION pulse (if it is defined) is always on, even if no length has been set.

The DEFENSE pulse always must start at the very beginning of the pulse pattern. And unless the function pulser_defense_pulse_mode() has been called with the appropriate arguments before the definition of the DFENSE pulse a defense pulse, covering the time from the start of the pulse pattern to some time after the end of the last active microwave pulse (see also function pulser_minimum_defense_distance()) will be created automatically.

To be able to create an RF pulse the R&S SML01 synthesizer mentioned above is required.

The length of pulses and the distance between them is limited to about 167 ms (and that's also the maximum delay between the start of the pulse sequence and the start of the first pulse of a function).

Status: Tested

Controlled via: Rulbus

Supported functions:

`pulser_name()'
`pulser_state()'
`pulser_update()'
`pulser_shift()'
`pulser_increment()'
`pulser_reset()'
`pulser_pulse_reset()'
`pulser_show_pulses()'
`pulser_dump_pulses()'
`pulser_minimum_defense_distance()'
`pulser_defense_pulse_mode()'
`pulser_pulse_minimum_specs()'

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