NDLI: A non-intercepting beam current monitor for the ISAC-II SC-linac

Content Provider	IEEE Xplore Digital Library
Author	Rawnsley, W.R. Laxdal, R.E. Mitra, A.K.
Copyright Year	2007
Description	Author affiliation: TRIUMF, Vancouver (Rawnsley, W.R.; Laxdal, R.E.; Mitra, A.K.)
Abstract	A personnel protection system will monitor the ion beam current into the experimental hall from the ISAC-II SC-linac. It will have continuous self-test and redundancy and an accuracy of +10%plusmn0.5 nA from 1 to 200 enA. The system, based on an Atlas design, will use capacitive pickups with RF resonators and buffer amplifiers. Ion charge, velocity and bunch width will affect the sensitivity so periodic calibration with dc Faraday cups will be needed. The signal from each 13 cm long, 5 cm diameter pickup tube will pass through a vacuum feedthrough to a helical resonator. An AD8075 IC with an input impedance of 40 kOmega at 35 MHz will allow a high coil tap. The ISAC beam, bunched at 11.8 MHz, is injected into the ISAC-II SC-linac via a 25 m long transfer line. The 35 MHz and 70 MHz coils (3rd and 6th harmonic) have loaded Q's of -675. A test in the transfer line of the 35 MHz coil gave a sensitivity 93 muV/enA from the unity gain buffer using $^{20}Ne^{+5}$ ions at 1.5 MeV/u. Another test downstream of the linac before the experimental hall yielded a sensitivity of 60 muV/enA for a beam of $^{22}Ne+^{4}$ ions at 4.97 MeV/u. The backgrounds were equivalent to 1 enA or less. System design and test data will be presented.
Starting Page	155
Ending Page	157
File Size	2195408
Page Count	3
File Format	PDF
ISBN	9781424409167
DOI	10.1109/PAC.2007.4440143
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Monitoring Coils Testing Personnel Protection Ion beams Built-in self-test Radio frequency Radiofrequency amplifiers Calibration
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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