Abstract
Microphonic-induced fluctuations in the RF eigenfrequency of superconducting (SC) slow-wave structures must be compensated by a fast-tuning system in order to control the RF phase. The tuning system must handle a reactive power proportional to the product of the frequency range and the RF energy content of the RF cavity. The fast tuner for the SC resonators in the ATLAS heavy-ion linac is a voltage-controlled reactance based on an array of PIN diodes operating immersed in liquid nitrogen. This paper discusses recent upgrades to the ATLAS fast tuner which can now provide as much as 30 KVA of reactive tuning capability with a real RF power loss of less than 300 watts. The design was guided by numerical modeling of all elements of the device. Also discussed is the RF coupler which can couple 30 KW from 77 K tuner to a 4.2 K resonant cavity with less than 2 W of RF loss into 4.2 K. (Author) 6 refs., 2 figs.
Added, N;
[1]
Clifft, B E;
Shepard, K W
[2]
- Sao Paulo Univ., SP (Brazil)
- Argonne National Lab., IL (United States)
Citation Formats
Added, N, Clifft, B E, and Shepard, K W.
Upgraded phase control system for superconducting low-velocity accelerating structures.
Canada: N. p.,
1992.
Web.
Added, N, Clifft, B E, & Shepard, K W.
Upgraded phase control system for superconducting low-velocity accelerating structures.
Canada.
Added, N, Clifft, B E, and Shepard, K W.
1992.
"Upgraded phase control system for superconducting low-velocity accelerating structures."
Canada.
@misc{etde_503132,
title = {Upgraded phase control system for superconducting low-velocity accelerating structures}
author = {Added, N, Clifft, B E, and Shepard, K W}
abstractNote = {Microphonic-induced fluctuations in the RF eigenfrequency of superconducting (SC) slow-wave structures must be compensated by a fast-tuning system in order to control the RF phase. The tuning system must handle a reactive power proportional to the product of the frequency range and the RF energy content of the RF cavity. The fast tuner for the SC resonators in the ATLAS heavy-ion linac is a voltage-controlled reactance based on an array of PIN diodes operating immersed in liquid nitrogen. This paper discusses recent upgrades to the ATLAS fast tuner which can now provide as much as 30 KVA of reactive tuning capability with a real RF power loss of less than 300 watts. The design was guided by numerical modeling of all elements of the device. Also discussed is the RF coupler which can couple 30 KW from 77 K tuner to a 4.2 K resonant cavity with less than 2 W of RF loss into 4.2 K. (Author) 6 refs., 2 figs.}
place = {Canada}
year = {1992}
month = {Nov}
}
title = {Upgraded phase control system for superconducting low-velocity accelerating structures}
author = {Added, N, Clifft, B E, and Shepard, K W}
abstractNote = {Microphonic-induced fluctuations in the RF eigenfrequency of superconducting (SC) slow-wave structures must be compensated by a fast-tuning system in order to control the RF phase. The tuning system must handle a reactive power proportional to the product of the frequency range and the RF energy content of the RF cavity. The fast tuner for the SC resonators in the ATLAS heavy-ion linac is a voltage-controlled reactance based on an array of PIN diodes operating immersed in liquid nitrogen. This paper discusses recent upgrades to the ATLAS fast tuner which can now provide as much as 30 KVA of reactive tuning capability with a real RF power loss of less than 300 watts. The design was guided by numerical modeling of all elements of the device. Also discussed is the RF coupler which can couple 30 KW from 77 K tuner to a 4.2 K resonant cavity with less than 2 W of RF loss into 4.2 K. (Author) 6 refs., 2 figs.}
place = {Canada}
year = {1992}
month = {Nov}
}