HB2023 - List of Keywords (pick-up)

Paper	Title	Other Keywords	Page
WEC1C1	Improvement Design of a Beam Current Monitor Based on a Passive Cavity Under Heavy Heat Load and Radiation	target, proton, cavity, radiation	205
	P.-A. Duperrex, J.E. Bachmann, M. Rohrer, J.L. Sun PSI, Villigen PSI, Switzerland
	The High Intensity Proton Accelerator at PSI delivers a continuous proton beam of up to 2.4 mA with a maximum energy of 590 MeV to two meson production targets, M and E, and then to the spallation target. Eight meters downstream from the target E located a beam current monitor MHC5, which endure intensive scattered particles from Target E and cause large temperature variation, further induce operation and calibration problems. To address these issues, a graphite monitor was designed to replace the older aluminum one. Based on years of operation experiences of this graphite cavity, improvement design has been also considered, including beam positon pickups refinement, on-line calibration methods implementation, as well as manipulation maintenance issues. Detailed aspects of the performance of the monitor and its improvement design will be presented in this paper.
	Slides WEC1C1 [4.024 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-WEC1C1
About •	Received ※ 01 October 2023 — Revised ※ 04 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 16 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THAFP03	Measurement of Stability Diagram at IOTA at Fermilab	experiment, kicker, damping, impedance	400
	M.K. Bossard, Y.K. Kim University of Chicago, Chicago, Illinois, USA R. Ainsworth, N. Eddy Fermilab, Batavia, Illinois, USA
	Funding: Fermilab Nonlinear focusing elements can enhance the stability of particle beams in high-energy colliders by means of Landau Damping, through the tune spread which is introduced. We propose an experiment at Fermilab’s Integrable Optics Test Accelerator (IOTA) to investigate the influence of nonlinear focusing elements on the transverse stability of the beam. In this experiment, we employ an anti-damper, an active transverse feedback system, as a controlled mechanism to induce coherent beam instability. By utilizing the anti-damper, we can examine the impact of the nonlinear focusing element on the beam’s transverse stability. The stability diagram, a tool used to determine the system’s stability, will be measured using a recently demonstrated method at the LHC. This measurement is carried out experimentally by selecting specific threshold gains and measuring them for a range of phases. The stability diagram is represented by gei¿ on the complex plane. The experiment at IOTA adds insight towards the stability diagram measurement method by supplying a reduced machine impedance, to investigate the impedance’s effect on the stability diagram, as well as a larger range of phase measurements.
	Slides THAFP03 [1.331 MB]
	Poster THAFP03 [1.692 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-THAFP03
About •	Received ※ 06 October 2023 — Revised ※ 09 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 12 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THAFP11	FPGA-Based Digital IQ Demodulator Used in the Beam Position Monitors for HIAF BRing	electron, FPGA, synchrotron, electronics	429
	F.F. Ni, Z.X. Li, R.X. Tian, Y. Wei, J.X. Wu IMP/CAS, Lanzhou, People’s Republic of China
	Funding: NSFC No. E911010301, Y913010GJ0, A digital beam position monitor processor has been developed for the High Intensity heavy ion Accelerator Facility (HIAF). The digital IQ demodulator is used in the Beam Position Monitor (BPM) signal processing. All data acquisition and digital signal processing algorithm routines are performed within the FPGA. In the BPM electronics system, a 250 MHz sample rates ADC was used to digitize the pick-ups signal. In the FPGA, the digital signal is filtered by ultra-narrow bandpass filters, then the digital IQ demodulator is used to calculate the beam position with difference-over-sum algorithm. The heavy ion synchrotron CSRm revolution frequency is changing from 0.2 MHz to 1.78 MHz when accelerates charged particles. In this design, a Direct Digital Synthesizer (DDS) whose output frequency changes over time is applied to generate the in-phase and quadrature components in the digital IQ demodulator. The performance of this designed BPM processor was evaluated with the online HIRFL-CSRm.
	Slides THAFP11 [1.332 MB]
	Poster THAFP11 [4.534 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-THAFP11
About •	Received ※ 28 September 2023 — Revised ※ 05 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 19 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

WEC1C1

Improvement Design of a Beam Current Monitor Based on a Passive Cavity Under Heavy Heat Load and Radiation

target, proton, cavity, radiation

205

P.-A. Duperrex, J.E. Bachmann, M. Rohrer, J.L. Sun
PSI, Villigen PSI, Switzerland

The High Intensity Proton Accelerator at PSI delivers a continuous proton beam of up to 2.4 mA with a maximum energy of 590 MeV to two meson production targets, M and E, and then to the spallation target. Eight meters downstream from the target E located a beam current monitor MHC5, which endure intensive scattered particles from Target E and cause large temperature variation, further induce operation and calibration problems. To address these issues, a graphite monitor was designed to replace the older aluminum one. Based on years of operation experiences of this graphite cavity, improvement design has been also considered, including beam positon pickups refinement, on-line calibration methods implementation, as well as manipulation maintenance issues. Detailed aspects of the performance of the monitor and its improvement design will be presented in this paper.

Slides WEC1C1 [4.024 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-WEC1C1

About •

Received ※ 01 October 2023 — Revised ※ 04 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 16 October 2023

Cite •

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

THAFP03

Measurement of Stability Diagram at IOTA at Fermilab

experiment, kicker, damping, impedance

400

M.K. Bossard, Y.K. Kim
University of Chicago, Chicago, Illinois, USA
R. Ainsworth, N. Eddy
Fermilab, Batavia, Illinois, USA

Funding: Fermilab
Nonlinear focusing elements can enhance the stability of particle beams in high-energy colliders by means of Landau Damping, through the tune spread which is introduced. We propose an experiment at Fermilab’s Integrable Optics Test Accelerator (IOTA) to investigate the influence of nonlinear focusing elements on the transverse stability of the beam. In this experiment, we employ an anti-damper, an active transverse feedback system, as a controlled mechanism to induce coherent beam instability. By utilizing the anti-damper, we can examine the impact of the nonlinear focusing element on the beam’s transverse stability. The stability diagram, a tool used to determine the system’s stability, will be measured using a recently demonstrated method at the LHC. This measurement is carried out experimentally by selecting specific threshold gains and measuring them for a range of phases. The stability diagram is represented by gei¿ on the complex plane. The experiment at IOTA adds insight towards the stability diagram measurement method by supplying a reduced machine impedance, to investigate the impedance’s effect on the stability diagram, as well as a larger range of phase measurements.

Slides THAFP03 [1.331 MB]

Poster THAFP03 [1.692 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-THAFP03

About •

Received ※ 06 October 2023 — Revised ※ 09 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 12 October 2023

Cite •

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

THAFP11

FPGA-Based Digital IQ Demodulator Used in the Beam Position Monitors for HIAF BRing

electron, FPGA, synchrotron, electronics

429

F.F. Ni, Z.X. Li, R.X. Tian, Y. Wei, J.X. Wu
IMP/CAS, Lanzhou, People’s Republic of China

Funding: NSFC No. E911010301, Y913010GJ0,
A digital beam position monitor processor has been developed for the High Intensity heavy ion Accelerator Facility (HIAF). The digital IQ demodulator is used in the Beam Position Monitor (BPM) signal processing. All data acquisition and digital signal processing algorithm routines are performed within the FPGA. In the BPM electronics system, a 250 MHz sample rates ADC was used to digitize the pick-ups signal. In the FPGA, the digital signal is filtered by ultra-narrow bandpass filters, then the digital IQ demodulator is used to calculate the beam position with difference-over-sum algorithm. The heavy ion synchrotron CSRm revolution frequency is changing from 0.2 MHz to 1.78 MHz when accelerates charged particles. In this design, a Direct Digital Synthesizer (DDS) whose output frequency changes over time is applied to generate the in-phase and quadrature components in the digital IQ demodulator. The performance of this designed BPM processor was evaluated with the online HIRFL-CSRm.

Slides THAFP11 [1.332 MB]

Poster THAFP11 [4.534 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-THAFP11

About •

Received ※ 28 September 2023 — Revised ※ 05 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 19 October 2023

Cite •

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