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Title: R & D of a Gas-Filled RF Beam Profile Monitor for Intense Neutrino Beam Experiments

Abstract

We report the R&D of a novel radiation-robust hadron beam profile monitor based on a gas-filled RF cavity for intense neutrino beam experiments. An equivalent RF circuit model was made and simulated to optimize the RF parameter in a wide beam intensity range. As a result, the maximum acceptable beam intensity in the monitor is significantly increased by using a low-quality factor RF cavity. The plan for the demonstration test is set up to prepare for future neutrino beam experiments.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [2]; ;  [2];  [2];  [2];  [2];  [3]
  1. Fermilab
  2. MUONS Inc., Batavia
  3. Case Western Reserve U.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1358089
Report Number(s):
FERMILAB-CONF-17-139-AD; IPAC-2017-MOPAB153
1600154
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: 8th International Particle Accelerator Conference, Copenhagen, Denmark, 05/14-05/19/2017
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Yonehara, K., Backfish, M., Moretti, A., Tollestrup, A. V., Watts, A., Zwaska, R. M., Abrams, R., Cummings, M. A., Dudas, A., Johnson, R. P., Kazakevich, G., Neubauer, M., and Liu, Q. R & D of a Gas-Filled RF Beam Profile Monitor for Intense Neutrino Beam Experiments. United States: N. p., 2017. Web.
Yonehara, K., Backfish, M., Moretti, A., Tollestrup, A. V., Watts, A., Zwaska, R. M., Abrams, R., Cummings, M. A., Dudas, A., Johnson, R. P., Kazakevich, G., Neubauer, M., & Liu, Q. R & D of a Gas-Filled RF Beam Profile Monitor for Intense Neutrino Beam Experiments. United States.
Yonehara, K., Backfish, M., Moretti, A., Tollestrup, A. V., Watts, A., Zwaska, R. M., Abrams, R., Cummings, M. A., Dudas, A., Johnson, R. P., Kazakevich, G., Neubauer, M., and Liu, Q. Mon . "R & D of a Gas-Filled RF Beam Profile Monitor for Intense Neutrino Beam Experiments". United States. doi:. https://www.osti.gov/servlets/purl/1358089.
@article{osti_1358089,
title = {R & D of a Gas-Filled RF Beam Profile Monitor for Intense Neutrino Beam Experiments},
author = {Yonehara, K. and Backfish, M. and Moretti, A. and Tollestrup, A. V. and Watts, A. and Zwaska, R. M. and Abrams, R. and Cummings, M. A. and Dudas, A. and Johnson, R. P. and Kazakevich, G. and Neubauer, M. and Liu, Q.},
abstractNote = {We report the R&D of a novel radiation-robust hadron beam profile monitor based on a gas-filled RF cavity for intense neutrino beam experiments. An equivalent RF circuit model was made and simulated to optimize the RF parameter in a wide beam intensity range. As a result, the maximum acceptable beam intensity in the monitor is significantly increased by using a low-quality factor RF cavity. The plan for the demonstration test is set up to prepare for future neutrino beam experiments.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}
}

Conference:
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  • MW-class beam facilities are being considered all over the world to produce an intense neutrino beam for fundamental particle physics experiments. A radiation-robust beam monitor system is required to diagnose the primary and secondary beam qualities in high-radiation environments. We have proposed a novel gas-filled RF-resonator hadron beam monitor in which charged particles passing through the resonator produce ionized plasma that changes the permittivity of the gas. The sensitivity of the monitor has been evaluated in numerical simulation. A signal manipulation algorithm has been designed. A prototype system will be constructed and tested by using a proton beam at themore » MuCool Test Area at Fermilab.« less
  • The influence of an intense beam in a high-pressure gas filled RF cavity has been measured by using a 400 MeV proton beam in the Mucool Test Area at Fermilab. The ionization process generates dense plasma in the cavity and the resultant power loss to the plasma is determined by measuring the cavity voltage on a sampling oscilloscope. The energy loss has been observed with various peak RF field gradients (E), gas pressures (p), and beam intensities in nitrogen and hydrogen gases. Observed RF energy dissipation in single electron (dw) in N{sub 2} and H{sub 2} gases was 2 10{supmore » -17} and 3 10{sup -17} Joules/RF cycle at E/p = 8 V/cm/Torr, respectively. More detailed dw measurement have been done in H{sub 2} gas at three different gas pressures. There is a clear discrepancy between the observed dw and analytical one. The discrepancy may be due to the gas density effect that has already been observed in various experiments.« less
  • No abstract prepared.
  • No abstract prepared.
  • The purpose of this analytical and experimental study is multifold: 1) To explore a new, radiation-robust, hadron beam profile monitor for intense neutrino beam applications; 2) To test, demonstrate, and develop a novel gas-filled Radio-Frequency (RF) cavity to use in this monitoring system. Within this context, the first section of the study analyzes the beam distribution across the hadron monitor as well as the ion-production rate inside the RF cavity. Furthermore a more effecient pixel configuration across the hadron monitor is proposed to provide higher sensitivity to changes in beam displacement. Finally, the results of a benchtop test of themore » tunable quality factor RF cavity will be presented. The proposed hadron monitor configuration consists of a circular array of RF cavities located at a radial distance of 7cm { corresponding to the standard deviation of the beam due to scatering { and a gas-filled RF cavity with a quality factor in the range 400 - 800.« less