ANITA Calibration System Jason Link University of Hawaii

ANITA Calibration System Jason Link University of Hawaii ANITA Collaboration Meeting at UCI 4/7/05 – 4/9/05

The ANITA Calibration System • • Calibration System Overview Noise Diode RF Tickler Status

Calibration System Diagram

Noise Diode Design History • Original design was to have 10 noise diode each split 8 ways into each QRH RF channel. • In the process of SURF prototyping Peter raised a concern that this design leads to a correlated noise signal in which is undesirable for testing of the trigger system. • Redesign to have a unique noise diode for each QRH RF channel with a simple bias circuit.

Noise Diode Module - Design • Larry Ruckman has laid out a board to accommodate two NC 305 Noisecom Noise Diodes (10 Hz-3 GHz, 30 -35 ENR) on a 24 V Bus. • Board fits in 1. 5” sq RF aluminum box from Compac-RF (same box used for Mini-Circuits ZKL-1 R 5). • Plan to use one module per RFCM. Noise diodes to be placed only in QRH RFCMs.

Calibration Pulser Box (Inside Main EMI Enclosure) Open Design Issues/Questions • Unknown if AVTECH works in Vacuum – test required. • TTL control of Pulser and Switch may require inverter as Acromag uses Active Low Logic. • Monitor Line to be read out by SURF channel? • Finalize antenna choice (Disc. Cone? ) and location.

AVTECH AVP-2 S-M Pulser • 0 -2 V amplitude pulser capable of pulses between 0. 2 -4. 0 ns. • Very fast pulses – rise time ≤ 50 ps, fall time ≤ 200 ps with rate up to 1 MHz. • Triggered via TTL pulse. • Unit will have a monitor line which provides a 20 d. B attenuated coincident replica of pulser output. • Must get customized unit to work on +24 V power bus – AVTECH can provide at a cost of $3547 • AVTECH can also provide a +24 V unit with temperature-stabilization circuitry so the pulse width when operated at 0. 2 ns will not vary more than +/- 20% as temperature varies from 12 -27 degrees and instrument will not be damaged operating from 0 to 50 C (as opposed to the nominal 0 -40 C). Pulse width would be limited to 1 ns rather than 4 ns. Cost increases to $5945.

Calibration System Status • Have quotes from AVTECH on pulser (~2. 5 month lead time) • RF Switch has been ordered • ND components for EM flight are in house, boards and boxes should be arriving this week, ~1 week to stuff all boards for EM flight, ~1 week to test. • Have not done any work on antennas for pulser.