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instruments:overview:ccc [2015/12/05 09:36] phebyn |
instruments:overview:ccc [2022/02/04 14:55] dhaider [Further Information] |
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- | ====Cryogenic Current Comparator (CCC)==== | + | =====Cryogenic Current Comparator (CCC)===== |
- | The CCC is a cryogenic DC beam current transformer. It measures the intensity of lowest beam currents, circulating in storage rings, or extracted through high energy beam transport lines. The present best values, obtained with a thin-film DC SQUID at 4 K, are: | + | The CCC is a cryogenic DC beam current transformer. It measures the intensity of lowest beam currents, circulating in storage rings, or extracted through high energy beam transport lines. The present best values, obtained with a thin-film DC SQUID at 4.2 K, are: |
* Current resolution < 6-120 pA/sqrt(Hz) (within a bandwidth of DC-10 kHz) | * Current resolution < 6-120 pA/sqrt(Hz) (within a bandwidth of DC-10 kHz) | ||
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* Zero drift < 4 pA/s | * Zero drift < 4 pA/s | ||
More information: | More information: | ||
- | [[instruments: | ||
==== History ==== | ==== History ==== | ||
- | After the development of SQUID magnetometers at Ford Research lab[citation-wiki] in 1965, I. K. Harvey at National Standards Lab, Sydney, | + | After the development of SQUID magnetometers at Ford Research lab[[https:// |
Based on the same principle, a Cryogenic Current Comparator was developed at the Beam Diagnostic group, GSI in 1995 in collaboration with Institute of Solid State Physics, Friedrich Schiller University (FSU), Jena.\\ | Based on the same principle, a Cryogenic Current Comparator was developed at the Beam Diagnostic group, GSI in 1995 in collaboration with Institute of Solid State Physics, Friedrich Schiller University (FSU), Jena.\\ | ||
- | \\ | + | ---- |
{{instruments: | {{instruments: | ||
- | //The project was kicked off by this magazine article | + | |
- | \\ | + | //The project was kicked off following |
+ | ---- | ||
This joined project was successfully shown to measure ion beam current down to <10 nA with a bandwidth exceeding 10 kHz. The non-intercepting and absolute measurement possibilities with a wide dynamic range using CCC provided interesting applications in beam diagnostics. Intensity measurements independent of beam energy, type and trajectories with absolute calibration provided the possibility of calibration of other standard intensity measurement devices, especially in the low intensity ranges, where standard beam current transformers cannot be used.\\ | This joined project was successfully shown to measure ion beam current down to <10 nA with a bandwidth exceeding 10 kHz. The non-intercepting and absolute measurement possibilities with a wide dynamic range using CCC provided interesting applications in beam diagnostics. Intensity measurements independent of beam energy, type and trajectories with absolute calibration provided the possibility of calibration of other standard intensity measurement devices, especially in the low intensity ranges, where standard beam current transformers cannot be used.\\ | ||
\\ | \\ | ||
After a number of beam measurements with the CCC, this project lead to award winning results: | After a number of beam measurements with the CCC, this project lead to award winning results: | ||
- | [[http:// | + | [[http:// |
- | [[instruments: | + | \\ |
- | Recent Developments]]\\ | + | ==== Recent Developments ==== |
- | ===== Recent Developments ===== | + | |
Given by the wide beam energy and intensity ranges planned in the FAIR beam lines, seven CCC systems are foreseen to be installed at its transfer lines and storage rings. Hence in 2009, this project was re-started to develop improved CCC systems by incorporating advanced components and instrumentations.\\ | Given by the wide beam energy and intensity ranges planned in the FAIR beam lines, seven CCC systems are foreseen to be installed at its transfer lines and storage rings. Hence in 2009, this project was re-started to develop improved CCC systems by incorporating advanced components and instrumentations.\\ | ||
\\ | \\ | ||
After successful re-commission of the existing GS-CCC system and a number of optimization measurements, | After successful re-commission of the existing GS-CCC system and a number of optimization measurements, | ||
- | [[projects: | + | \\ |
+ | ==== Further Information ==== | ||
+ | [[projects: | ||
+ | \\ | ||
[[projects: | [[projects: | ||
+ | \\ | ||
+ | [[projects: | ||
+ | \\ | ||
+ | Documentation of the [[projects: | ||
+ | \\ | ||
+ | Positioning of first Cryocompressor for CCC " | ||
+ | \\ | ||
+ | CCC elog: https:// |