A high-frequency Schottky detector for use in the Tevatron
A vexing problem associated with detection of Schottky signals from a bunched beam is the presence of the coherent signal, which can be 10 or more orders of magnitude greater than the Schottky signal. However, above the single-bunch cutoff frequency (SBCF), the coherent signal decays rapidly with frequency. To take advantage of this, we have constructed a Schottky detector for the Tevatron doubler to operate at roughly 2 GHz (the Tevatron SBCF is 200 to 300 MHz). To enhance signal power density, we have made the detector a high-Q (>9000) resonant rectangular cavity, which should provide a signal-to-noise-density ratio (S/N) of >10 dB for the Tevatron in the collider mode, and >20 dB in fixed target operation. The TM/sub 210/ and TM/sub 120/ modes, which are made to have slightly different frequencies, provide sensitivity to both vertical and horizontal particle motions. The 2 GHz Schottky signals are down-converted to frequencies below 100 kHz to permit analysis using a FFT spectrum analyzer. The initial installation consists of a single cavity; a second detector will be built which employs a pair of phased cavities to permit discrimination between p's and anti p's. Details of the design of both the cavity and the associated electronics are presented. The cavity is currently undergoing installation at the Tevatron.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6415531
- Report Number(s):
- LBL-22273; CONF-870302-171; ON: DE87009547
- Resource Relation:
- Conference: Particle accelerator conference, Washington, DC, USA, 16 Mar 1987; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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A high-frequency Schottky detector for use in the Tevatron
Successful observation of Schottky signals at the Tevatron collider