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Title: Digital beam position monitor for the HAPPEX experiment

Abstract

The proposed HAPPEX experiment at CEBAF employs a three cavity monitor system for high precision (1um), high bandwidth (100 kHz) position measurements. This is performed using a cavity triplet consisting of two TM110-mode cavities (one each for X and Y planes) combined with a conventional TM010-mode cavity for a phase and magnitude reference. Traditional systems have used the TM010 cavity output to directly down convert the BPM cavity signals to base band. The multi-channel HAPPEX digital receiver simultaneously I/Q samples each cavity and extracts position using a CORDIC algorithm. The hardware design consists of a RF receiver daughter board and a digital processor motherboard that resides in a VXI crate. The daughter board down converts 1.497 GHz signals from the TM010 cavity and X and Y signals from the TM110 cavities to 3 MHz and extracts the quadrature digital signals. The motherboard processes this data and computes beam intensity and X-Y positions with resolution of 1um, 100 kHz output bandwidth, and overall latency of 1us. The results are available in both the analog and digital format.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE; USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
840079
Report Number(s):
JLAB-ACE-05-356; DOE/ER/40150-3384
TRN: US0501780
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Conference
Resource Relation:
Conference: PAC 2005, Knoxville, TN (US), 05/16/2005--05/20/2005; Other Information: PBD: 1 May 2005
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM POSITION; DESIGN; BEAM MONITORS; QUADRATURES; RESOLUTION; TRIPLETS; CEBAF ACCELERATOR

Citation Formats

Kauffman, Sherlon, Musson, John, Dong, Hai, Kaufman, Lisa, and Freyberger, Arne. Digital beam position monitor for the HAPPEX experiment. United States: N. p., 2005. Web.
Kauffman, Sherlon, Musson, John, Dong, Hai, Kaufman, Lisa, & Freyberger, Arne. Digital beam position monitor for the HAPPEX experiment. United States.
Kauffman, Sherlon, Musson, John, Dong, Hai, Kaufman, Lisa, and Freyberger, Arne. 2005. "Digital beam position monitor for the HAPPEX experiment". United States. https://www.osti.gov/servlets/purl/840079.
@article{osti_840079,
title = {Digital beam position monitor for the HAPPEX experiment},
author = {Kauffman, Sherlon and Musson, John and Dong, Hai and Kaufman, Lisa and Freyberger, Arne},
abstractNote = {The proposed HAPPEX experiment at CEBAF employs a three cavity monitor system for high precision (1um), high bandwidth (100 kHz) position measurements. This is performed using a cavity triplet consisting of two TM110-mode cavities (one each for X and Y planes) combined with a conventional TM010-mode cavity for a phase and magnitude reference. Traditional systems have used the TM010 cavity output to directly down convert the BPM cavity signals to base band. The multi-channel HAPPEX digital receiver simultaneously I/Q samples each cavity and extracts position using a CORDIC algorithm. The hardware design consists of a RF receiver daughter board and a digital processor motherboard that resides in a VXI crate. The daughter board down converts 1.497 GHz signals from the TM010 cavity and X and Y signals from the TM110 cavities to 3 MHz and extracts the quadrature digital signals. The motherboard processes this data and computes beam intensity and X-Y positions with resolution of 1um, 100 kHz output bandwidth, and overall latency of 1us. The results are available in both the analog and digital format.},
doi = {},
url = {https://www.osti.gov/biblio/840079}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun May 01 00:00:00 EDT 2005},
month = {Sun May 01 00:00:00 EDT 2005}
}

Conference:
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