Abstract. In designing an ionization profile monitor system for the Tevatron some novel approaches were taken, in particular for the readout electronics. This was motivated by the desire to resolve the individual bunches in both beams simultaneously. For this purpose, custom made electronics originally developed for Particle Physics experiments was used to provide a fast charge integration with very low noise. The various parts of the read-out electronics have been borrowed or adapted from the KTev, CMS, MINOS and BTev experiments. The detector itself also had to be modified to provide clean signals with sufficient bandwidth. The system design will be described along with the initial results.

The new Booster Ion Profile Monitor has been implemented to simultaneously capture both horizontal and vertical profiles at a once-per-turn sample rate, throughout a Booster cycle. The system uses LabVIEW software running on a MacIntosh Quadra 650 talking to both VME and CAMAC hardware. Microchannel plate voltage is turned on just prior to making a measurement and automatically turned off when the measurement is complete. This action allows using a high gain while preserving microchannel plate lifetime. The data captured may be archived for later analysis. Current analysis available include position, emittance/sigma, 2D color intensity plot of raw data, and single turn profiles for any turn during the cycle.

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Primarily to study emittance blowup during injection and ramping, an ionization profile monitor has been developed for the Tevatron. It is based on a prototype installed in the Main Injector, although with extensive modifications. In particular, the electromagnetic shielding has been improved, the signal path has been cleaned up, and provisions have been made for an internal electron source. Due to the good Tevatron vacuum, a local pressure bump is introduced to increase the primary signal, which is then amplified by a microchannel plate and detected on anode strips. For the DAQ, a custom ASIC developed for the CMS experiment is used. It is a combined charge integrator and digitizer, with a sensitivity of a few fC, and a time-resolution that allows single bunch measurement. Digitization is done in the tunnel to reduce noise. Preparations for detector installation were made during the long 2004 shutdown, with the installation of magnets, vacuum chambers, vacuum pumps and cabling. The actual detector will be installated during the fall 2005 shutdown. This paper describes the design of the detector and associated electronics, and presents various bench test results.