198 lines
8.8 KiB
Rust
198 lines
8.8 KiB
Rust
//! this example positions buffers adjacently and uses an ASYMMETRIC coil winding
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//! it demonstrates a logic-high transmission rate > 1, but also a rapid degradation of logic-low.
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//! i believe logic-low values are degraded MOSTLY because of direct coupling between the clock
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//! wire and the coupling wire (instead of coupling achieved exclusively via the core).
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//!
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//! this models an inverter function that's something like mem2 = 700 - 0.15*mem1.
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//! that 0.15 factor is too small for a cascadable inverter, which needs to be at least 1.0.
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//! this factor can be increased by increasing the energy dumped into the clock -- but in order for
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//! that to be workable i need to first decrease the direct coupling between the clock and mem2.
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//! that will be the goal of buffer_proto5.
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use coremem::{Driver, mat, meas, SpirvDriver};
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use coremem::geom::{region, Cube, Meters, Spiral, SwapYZ, Torus, Translate, Wrap};
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use coremem::sim::units::Seconds;
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use coremem::stim::{CurlStimulus, Sinusoid, TimeVarying as _};
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fn main() {
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coremem::init_logging();
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let feat_size = 40e-6f32;
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let buffer_xy = 160e-6;
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let buffer_z = 160e-6;
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let boundary_xy = 320e-6;
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let boundary_z = 320e-6;
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let ferro_major = 640e-6;
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let ferro_minor = 60e-6;
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let ferro_buffer = 640e-6; // horizontal space between ferros
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let wire_minor = 40e-6;
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let wire_wrap_minor = 240e-6; // 2x wire_wrap_minor + feat_size must be < ferro_buffer
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let wire_set_major = 600e-6; // this just needs to exceed ferro_minor + wire_wrap_minor + feat_size + wire_minor
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let drive_conductivity = 5e6f32;
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let peak_set_current = 60.0;
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let peak_clock_current = 5.0;
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let set_duration = 20e-9; // half-wavelength of the sine wave
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let steady_time = 160e-9; // how long to wait for sets to stabilize
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let clock_duration = 40e-9;
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let m_to_um = |m: f32| (m * 1e6).round() as u32;
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let feat_vol = feat_size * feat_size * feat_size;
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let base = "buffer4-NN";
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let width = 4.0*ferro_major + 2.0*(buffer_xy + boundary_xy + wire_set_major + wire_minor) + ferro_buffer;
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let height = 2.0*(ferro_major + ferro_minor + 2.0*wire_wrap_minor + feat_size + buffer_xy + boundary_xy);
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let depth = 2.0*(wire_set_major + wire_minor + buffer_z + boundary_z);
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let ferro1_center = Meters::new(
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buffer_xy + boundary_xy + wire_set_major + wire_minor + ferro_major,
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buffer_xy + boundary_xy + ferro_major + ferro_minor + 2.0*wire_wrap_minor + feat_size,
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buffer_z + boundary_z + wire_set_major + wire_minor
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);
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let ferro2_center = ferro1_center + Meters::new(2.0*ferro_major + ferro_buffer, 0.0, 0.0);
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let ferro_center = (ferro1_center + ferro2_center)*0.5;
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// reserve the left/right locations for the SET wires.
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let set1_center = ferro1_center - Meters::new(ferro_major, 0.0, 0.0);
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let set2_center = ferro2_center + Meters::new(ferro_major, 0.0, 0.0);
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let ferro1_region = Torus::new_xy(ferro1_center, ferro_major, ferro_minor);
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let ferro2_region = Torus::new_xy(ferro2_center, ferro_major, ferro_minor);
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let set1_region = Torus::new_xz(set1_center, wire_set_major, wire_minor);
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let set2_region = Torus::new_xz(set2_center, wire_set_major, wire_minor);
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let coupling_region1 = Wrap::new_about(
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Translate::new(
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SwapYZ::new(region::and_not(
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Spiral::new(ferro_minor + wire_wrap_minor + feat_size, wire_wrap_minor, 0.125),
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Cube::new(Meters::new(-1.0, -1.0, -0.125), Meters::new(1.0, 1.0, 0.125))
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)),
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ferro1_center + Meters::new(1.0*ferro_major, 0.0, 0.0),
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),
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1.0, // one half-rev => y=1.0
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ferro1_center,
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);
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let coupling_region2 = Wrap::new_about(
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Translate::new(
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SwapYZ::new(region::and_not(
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Spiral::new(ferro_minor + wire_wrap_minor + feat_size, wire_wrap_minor, 0.125),
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Cube::new(Meters::new(-1.0, -1.0, -0.875), Meters::new(1.0, 1.0, 0.875))
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)),
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ferro2_center + Meters::new(1.0*ferro_major, 0.0, 0.0),
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),
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1.0, // one half-rev => y=1.0
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ferro2_center,
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);
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let coupling_wire_top = Cube::new_centered(
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ferro_center - Meters::new(0.0, 0.45*ferro_major, 0.0),
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Meters::new(ferro_buffer - 3.0*feat_size, 1.0*feat_size, 2.0*feat_size)
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);
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let coupling_wire_bot = Cube::new_centered(
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ferro_center + Meters::new(0.0, 0.45*ferro_major, 0.0),
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Meters::new(ferro_buffer - 3.0*feat_size, 1.0*feat_size, 2.0*feat_size)
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);
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let coupling_region = region::Union::new()
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.with(coupling_region1.clone())
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.with(coupling_region2.clone())
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// we don't actually need these coupling wires: the wraps touch naturally.
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// .with(coupling_wire_top.clone())
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// .with(coupling_wire_bot.clone())
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;
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// mu_r=881.33, starting at H=25 to H=75.
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let ferro_mat = mat::MHPgram::new(25.0, 881.33, 44000.0);
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let wire_mat = mat::IsomorphicConductor::new(drive_conductivity);
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let mut driver: SpirvDriver = Driver::new_spirv(Meters::new(width, height, depth), feat_size);
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driver.set_steps_per_stim(1000);
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driver.fill_region(&ferro1_region, ferro_mat);
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driver.fill_region(&ferro2_region, ferro_mat);
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driver.fill_region(&set1_region, wire_mat);
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driver.fill_region(&set2_region, wire_mat);
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driver.fill_region(&coupling_region, wire_mat);
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println!("boundary: {}um; {}um", m_to_um(boundary_xy), m_to_um(boundary_z));
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println!("size: {}, {}, {}", width, height, depth);
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println!("ferro1: {:?}", ferro1_center);
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println!("ferro2: {:?}", ferro2_center);
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driver.add_classical_boundary(Meters::new(boundary_xy, boundary_xy, boundary_z));
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assert!(driver.test_region_filled(&ferro1_region, ferro_mat));
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assert!(driver.test_region_filled(&ferro2_region, ferro_mat));
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assert!(driver.test_region_filled(&set1_region, wire_mat));
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assert!(driver.test_region_filled(&set2_region, wire_mat));
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assert!(driver.test_region_filled(&coupling_region, wire_mat));
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let mut add_drive_pulse = |region: &Torus, start, duration, amp| {
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let wave = Sinusoid::from_wavelength(amp, duration * 2.0)
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.half_cycle()
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.shifted(start);
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driver.add_stimulus(CurlStimulus::new(
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region.clone(),
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wave.clone(),
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region.center(),
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region.axis()
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));
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};
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// J=\sigma E
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// dJ/dt = \sigma dE/dT
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// dE/dt = dJ/dt / \sigma
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// dE/dt = dI/dt / (A*\sigma)
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// if I = k*sin(w t) then dE/dt = k*w cos(w t) / (A*\sigma)
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// i.e. dE/dt is proportional to I/(A*\sigma), multiplied by w (or, divided by wavelength)
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let peak_set = peak_set_current / feat_vol / (set1_region.cross_section() * drive_conductivity);
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let peak_clock = peak_clock_current / feat_vol / (set1_region.cross_section() * drive_conductivity);
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// SET cores
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add_drive_pulse(&set1_region, 0.01*set_duration, set_duration, peak_set);
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add_drive_pulse(&set2_region, 0.01*set_duration, set_duration, peak_set);
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// CLEAR core1
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add_drive_pulse(&set1_region, set_duration + steady_time, clock_duration, peak_clock);
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let duration = 2.5*steady_time + set_duration + clock_duration;
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driver.add_measurement(meas::Volume::new("mem1", ferro1_region.clone()));
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driver.add_measurement(meas::MagneticLoop::new("mem1", ferro1_region.clone()));
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driver.add_measurement(meas::Volume::new("mem2", ferro2_region.clone()));
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driver.add_measurement(meas::MagneticLoop::new("mem2", ferro2_region.clone()));
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driver.add_measurement(meas::CurrentLoop::new("set1", set1_region.clone()));
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driver.add_measurement(meas::Power::new("set1", set1_region.clone()));
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driver.add_measurement(meas::CurrentLoop::new("set2", set2_region.clone()));
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// driver.add_measurement(meas::CurrentLoop::new("coupling1", coupling_region1.clone()));
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// driver.add_measurement(meas::CurrentLoop::new("coupling2", coupling_region2.clone()));
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// driver.add_measurement(meas::CurrentLoop::new("couplingtop", coupling_wire_top.clone()));
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// driver.add_measurement(meas::CurrentLoop::new("couplingbot", coupling_wire_bot.clone()));
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let prefix = format!("out/{}/{}-{}-{}setmA-{}setps-{}clkmA-{}clkps-{}um",
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base,
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base,
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*driver.size(),
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(peak_set_current * 1e3).round() as i64,
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(set_duration * 1e12).round() as i64,
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(peak_clock_current * 1e3).round() as i64,
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(clock_duration * 1e12).round() as i64,
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(feat_size * 1e6).round() as i64,
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);
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let _ = std::fs::create_dir_all(&prefix);
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driver.add_state_file(&*format!("{}/state.bc", prefix), 16000);
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// driver.add_serializer_renderer(&*format!("{}/frame-", prefix), 32000);
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driver.add_csv_renderer(&*format!("{}/meas.csv", prefix), 200, None);
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driver.add_csv_renderer(&*format!("{}/meas-sparse.csv", prefix), 8000, None);
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driver.step_until(Seconds(duration));
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}
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