NAPAC2016 - List of Keywords (collimation)

Paper	Title	Other Keywords	Page
WEPOA16	Fermilab Recycler Collimation System Design	ion, proton, operation, radiation	726
	B.C. Brown, P. Adamson, R. Ainsworth, D. Capista, K.J. Hazelwood, I. Kourbanis, N.V. Mokhov, D.K. Morris, M.J. Murphy, V.I. Sidorov, E.G. Stern, I.S. Tropin, M.-J. Yang Fermilab, Batavia, Illinois, USA
	Funding: Operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy. To provide 700 kW proton beams for neutrino production in the NuMI facility, we employ slip stacking in the Recycler with transfer to the Main Injector for recapture and acceleration. Slip stacking with 12 Booster batches per 1.33 sec cycle of the Main Injector has been implemented and extensive operation with 8 batches and 10 batches per MI cycle has been demonstrated. Operation in this mode since 2013 shows that loss localization is an essential component for long term operation. Beam loss in the Recycler will be localized in a collimation region with design capability for absorbing up to 2 kW of lost protons in a pair of 20-Ton collimators (absorbers). This system will employ a two stage collimation with a thin Mo scattering foil to define the bottom edge of both the injected and decelerated-for-slipping beams. Optimization and engineering design of the collimator components and radiation shielding are based on comprehensive MARS15 simulations predicting high collimation efficiency as well as tolerable levels of prompt and residual radiation. The system installation during the Fermilab 2016 facility shutdown will permit commissioning in the subsequent operating period.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA16
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WEPOA18	Experimental Studies of Beam Collimation System in the Fermilab Booster	ion, booster, proton, radiation	732
	V.V. Kapin, S. Chaurize, N.V. Mokhov, W. Pellico, M. Slabaugh, T. Sullivan, R. Tesarek, A.K. Triplett Fermilab, Batavia, Illinois, USA
	A two-stage collimation (2SC) system was installed in Fermilab Booster around 2004 and consists of 2 primary collimators (PrC), one for each of the horizontal and vertical planes and 3 secondary collimators (SC) each capable of acting in both planes. Presently, only SC are used as the single-stage collimation (1SC). Part of the Fermilab Proton Improvement Plan (PIP) includes a task to test 2SC for Booster operations. In this paper we describe preparatory steps to fix SC motion issues and installation of a 380μm thick aluminum foil PrC and post-processing software for beam orbit and beam loss measurements. The initial experimental results for 2SC in the vertical plane are also presented. The tuning of 2SC system was performed using fast loss monitors allowing much higher time-resolution than existing BLMs. Analysis of losses and beam transmission efficiency allow for the comparison of 1SC and 2SC schemes.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA18
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WEPOA20	Numerical Simulations of Collimation Efficiency for Beam Collimation System in the Fermilab Booster	ion, proton, booster, simulation	735
	V.V. Kapin, V.A. Lebedev, N.V. Mokhov, S.I. Striganov, I.S. Tropin Fermilab, Batavia, Illinois, USA
	A two-stage beam collimation (2SC) system has been installed in the Fermilab Booster more than 10 years ago. It consists of two primary collimators (horizontal and vertical) and three 1.2m-long secondary collimators. The two-stage collimation has never been used in Booster operations due to uncontrolled beam orbit variations produced by radial cogging (it is required for beam accumulation in Recycler). Instead, only secondary collimators were used in the single-stage collimation (1SC). Recently introduced magnetic cogging resulted in orbit stabilization in the course of almost entire accelerating cycle and created a possibility for the 2SC. In this paper, the 2SC performance is evaluated and compared the 1SC. Several parameters characterizing collimation efficiency are calculated in order to compare both schemes. A combination of the MADX and MARS15 codes is used for proton tracking in the Booster with their scattering in collimators being accounted. The dependence of efficiency on the primary collimators foil thickness is presented. The efficiency dependence on the proton energy is also obtained for the optimal foil. The feasibility of the 2SC scheme for the Booster is discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA20
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Paper

Title

Other Keywords

Page

WEPOA16

Fermilab Recycler Collimation System Design

ion, proton, operation, radiation

726

B.C. Brown, P. Adamson, R. Ainsworth, D. Capista, K.J. Hazelwood, I. Kourbanis, N.V. Mokhov, D.K. Morris, M.J. Murphy, V.I. Sidorov, E.G. Stern, I.S. Tropin, M.-J. Yang
Fermilab, Batavia, Illinois, USA

Funding: Operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy.
To provide 700 kW proton beams for neutrino production in the NuMI facility, we employ slip stacking in the Recycler with transfer to the Main Injector for recapture and acceleration. Slip stacking with 12 Booster batches per 1.33 sec cycle of the Main Injector has been implemented and extensive operation with 8 batches and 10 batches per MI cycle has been demonstrated. Operation in this mode since 2013 shows that loss localization is an essential component for long term operation. Beam loss in the Recycler will be localized in a collimation region with design capability for absorbing up to 2 kW of lost protons in a pair of 20-Ton collimators (absorbers). This system will employ a two stage collimation with a thin Mo scattering foil to define the bottom edge of both the injected and decelerated-for-slipping beams. Optimization and engineering design of the collimator components and radiation shielding are based on comprehensive MARS15 simulations predicting high collimation efficiency as well as tolerable levels of prompt and residual radiation. The system installation during the Fermilab 2016 facility shutdown will permit commissioning in the subsequent operating period.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA16

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPOA18

Experimental Studies of Beam Collimation System in the Fermilab Booster

ion, booster, proton, radiation

732

V.V. Kapin, S. Chaurize, N.V. Mokhov, W. Pellico, M. Slabaugh, T. Sullivan, R. Tesarek, A.K. Triplett
Fermilab, Batavia, Illinois, USA

A two-stage collimation (2SC) system was installed in Fermilab Booster around 2004 and consists of 2 primary collimators (PrC), one for each of the horizontal and vertical planes and 3 secondary collimators (SC) each capable of acting in both planes. Presently, only SC are used as the single-stage collimation (1SC). Part of the Fermilab Proton Improvement Plan (PIP) includes a task to test 2SC for Booster operations. In this paper we describe preparatory steps to fix SC motion issues and installation of a 380μm thick aluminum foil PrC and post-processing software for beam orbit and beam loss measurements. The initial experimental results for 2SC in the vertical plane are also presented. The tuning of 2SC system was performed using fast loss monitors allowing much higher time-resolution than existing BLMs. Analysis of losses and beam transmission efficiency allow for the comparison of 1SC and 2SC schemes.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA18

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPOA20

Numerical Simulations of Collimation Efficiency for Beam Collimation System in the Fermilab Booster

ion, proton, booster, simulation

735

V.V. Kapin, V.A. Lebedev, N.V. Mokhov, S.I. Striganov, I.S. Tropin
Fermilab, Batavia, Illinois, USA

A two-stage beam collimation (2SC) system has been installed in the Fermilab Booster more than 10 years ago. It consists of two primary collimators (horizontal and vertical) and three 1.2m-long secondary collimators. The two-stage collimation has never been used in Booster operations due to uncontrolled beam orbit variations produced by radial cogging (it is required for beam accumulation in Recycler). Instead, only secondary collimators were used in the single-stage collimation (1SC). Recently introduced magnetic cogging resulted in orbit stabilization in the course of almost entire accelerating cycle and created a possibility for the 2SC. In this paper, the 2SC performance is evaluated and compared the 1SC. Several parameters characterizing collimation efficiency are calculated in order to compare both schemes. A combination of the MADX and MARS15 codes is used for proton tracking in the Booster with their scattering in collimators being accounted. The dependence of efficiency on the primary collimators foil thickness is presented. The efficiency dependence on the proton energy is also obtained for the optimal foil. The feasibility of the 2SC scheme for the Booster is discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA20

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)