1 / 4

Liverpool Shunts

Stave module with External Shunt Regulation. BNL shunts (Dave Lynn/Phil Kuczewsk ). Liverpool Shunts. External shunts provide an alternative source of voltage regulation for a hybrid Hybrids currently come with a distributed shunt scheme ( Mshunt )

anitra
Download Presentation

Liverpool Shunts

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Stave module with External Shunt Regulation BNL shunts (Dave Lynn/Phil Kuczewsk) Liverpool Shunts • External shunts provide an alternative source of voltage regulation for a hybrid • Hybrids currently come with a distributed shunt scheme (Mshunt) • Regulator circuit on board hybrid with 2 off bypass transistors per ABCN-25 • External shunt uses an external regulator circuit with a single bypass transistor (mounted on a plug-in) • Mshunt disabled by connecting control lines to hybrid (local) ground on plug-in • 2 flavours of shunt plug-ins available: • BNL shunt, fixed output voltage (preset to 2.6V) • 2 off provided, used as a first proof of principle on a module • Liverpool shunt, output voltage trimmable over the range 2.6V to 3.0V (set to 2.6V) • 8 off available to complement a stavelet

  2. Stave module with BNL Shunt Regulator - results 3PT Gain Input Noise @1fC 590e 600e 601e 591e Dtnoise scans Dtnoise @1fC Dtnoise @0.75fC 0 662 0 0 AC AC 1 26 1 0 24510 6822 1243 1259 DC DC 1249 23929 7559 1262 • Numbers in black are the sum(hits) for BNL Plug-in • Red is the sum(hits) for the on-board shunt regulator • Noise bands present irrespective of the shunt regulation scheme with no additional decoupling capacitors

  3. Stave module with Liverpool Shunt Regulator - results 3PT Gain Input Noise @1fC 586e 609e 588e 611e Dtnoise scans with decoupling capacitors added (as prescribed by Peter Phillips) Dtnoise@0.5fC 204 131 • Dtnoise is clean down to 0.75fC for both BNL and Liverpool shunts • Once decoupling is added • Dtnoise plot at 0.5fC is shown for Liverpool plug-in • Numbers in black are the sum(hits) for Liverpool shunt • Red is the sum(hits) for the BNL shunt 93 53 122 1641 85 1444

  4. Summary • External shunt regulation for the powering of module has been shown to work • Input noise is as expected at ~600e ENC • The Dtnoise scans show noise bands at 1fC – this is true for both the BNL and Liverpool shunts • As is the case for the onboard Mshunt • Additional capacitive decoupling is required to recover Dtnoise performance • Both external shunts provide clean occupancies down to 0.75fC • Only at low threshold of 0.5fC do we see evidence of the noise bands • Currently have 8 Liverpool shunts tested and (presently being) shipped to RAL for stavelet testing

More Related