PAC09 - List of Authors (Tashev, I.)

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Tashev, I.

Paper	Title	Page
TH6REP041	Maximum-Entropy-Based Tomographic Reconstruction of Beam Density Distribution	4042
	Y.-N. Rao, R.A. Baartman TRIUMF, Vancouver G. Goh SFU, Burnaby, BC I. Tashev UBC, Vancouver, B.C.
	Funding: TRIUMF receives funding via a contribution agreement through the National Research Council of Canada. For ISAC at TRIUMF, radioactive isotopes are generated with a 500MeV proton beam. The beam power is up to 40kW and can easily melt the delicate target if too tightly focused. We protect this target by closely monitoring the distribution of the incident proton beam. There is a 3-wire scanner monitor installed near the target; these give the vertical profile and the +45 and -45 degree profiles. Our objective is to use these 3 measured projections to find the 2-D density distribution. By implementing the maximum entropy (MENT) algorithm, we have developed a computer program to realize tomographic reconstruction of the beam density distribution. Of particular concern is to make the calculation sufficiently efficient that an operator can obtain the distribution within a few seconds of the scan. As well, we have developed the technique to perform phase space reconstruction, using many wire scans and the calculated transfer matrices between them. In this paper we present details of the computer code and the techniques used to improve noise tolerance and compute efficiency.

Paper

Title

Page

TH6REP041

Maximum-Entropy-Based Tomographic Reconstruction of Beam Density Distribution

4042

Y.-N. Rao, R.A. Baartman
TRIUMF, Vancouver
G. Goh
SFU, Burnaby, BC
I. Tashev
UBC, Vancouver, B.C.

Funding: TRIUMF receives funding via a contribution agreement through the National Research Council of Canada.

For ISAC at TRIUMF, radioactive isotopes are generated with a 500MeV proton beam. The beam power is up to 40kW and can easily melt the delicate target if too tightly focused. We protect this target by closely monitoring the distribution of the incident proton beam. There is a 3-wire scanner monitor installed near the target; these give the vertical profile and the +45 and -45 degree profiles. Our objective is to use these 3 measured projections to find the 2-D density distribution. By implementing the maximum entropy (MENT) algorithm, we have developed a computer program to realize tomographic reconstruction of the beam density distribution. Of particular concern is to make the calculation sufficiently efficient that an operator can obtain the distribution within a few seconds of the scan. As well, we have developed the technique to perform phase space reconstruction, using many wire scans and the calculated transfer matrices between them. In this paper we present details of the computer code and the techniques used to improve noise tolerance and compute efficiency.