1 / 15

Total Loss Monitor Report

Total Loss Monitor Report. All experimenters meeting 5/12/14 A. Leveling. Prelude. Chipmunk electrometer (blue box). Chipmunk. Chipmunk ion chamber. TLM detector cable. Prelude. 3 parallel TLM detectors 125’ 250’ 350’. Chipmunks provide discrete, above-ground coverage. Pbar

kenyon-hendrix
Download Presentation

Total Loss Monitor Report

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. Total Loss Monitor Report All experimenters meeting 5/12/14 A. Leveling

  2. Prelude Chipmunk electrometer (blue box) Chipmunk Chipmunk ion chamber TLM detector cable A. Leveling

  3. Prelude 3 parallel TLM detectors 125’ 250’ 350’ Chipmunks provide discrete, above-ground coverage Pbar A2B7 magnet TLM provides continuous, in-tunnel coverage A. Leveling

  4. The problem: • Radiation Safety System (RSS) at pbar service buildings includes 42 Chipmunks • Adequate for the 8 GeV, 13 watt pbar ops • RSS needs to be extended for 8 GeV, 8 kW mu2e operation – about 200 units • Unit cost is about $10k or total of $2M • Includes detector construction, doghouses, electrical installation M&S, RSS infrastructure • Would add tremendous complexity, e.g., • Chipmunks require annual calibration • RSS testing A. Leveling

  5. Why TLMs? • Following a Director’s review in May 2011 for mu2e CD1, ESH&Q Section Head suggested that we consider Long Detectors in lieu of Chipmunks • Long detectors have a long history at FNAL; they have been highly regarded by their proponents • Switchyard • Booster • NuMI • External beam lines • The obstacle: long detectors could not serve in the capacity of a CREDITED CONTROL for the Accelerator Safety Envelope A. Leveling

  6. Development history • Work to characterize long detector response began immediately in May 2011 • A long series of studies was conducted at pbar to characterize detector response as a function of 8 GeV beam loss • Detector response curves for the ion chamber region were developed A. Leveling

  7. Development history • BLM electrometers were used in early studies with disappointing results • A Chipmunk, sans ion chamber, was then used (aka blue box, electrometer) • Provided linear, predictable response • The blue box was already a critical component of the existing RSS! • Electrometer: collects and measures charge produced in the detector A. Leveling

  8. TLM electrometer development • The job was simply to mimicthe features of the existingChipmunk • Provide a heartbeat function • Failsafe design • Key problem was to develop the required dynamic range, not just for mu2e but for all conceivable applications – Booster, MI, NuMI, etc. • A couple of new design features were created to eliminate lost data collected by the site wide Radiation Monitoring System (MUX) A. Leveling

  9. TLM detector/electrometer testing • 3 electrometers were designed • The chosen design has been in service in wide variety of applications starting in December 2012 • Linac – 10 foot detector • Booster – 180 foot detector (P10-12) • Pbar – 125’, 250’, and 350’ detectors • NuMI – four 200’ connected in series • NML – 10 foot detector A. Leveling

  10. How does it work? • The shielding thickness available at a given location, along with desired occupancy, determine upper limit of allowable beam loss • The TLM trip level is determined from our knowledge of detector response as a function of beam energy and intensity • Developed over the past 3 years with measurements A. Leveling

  11. Progress over the past year • Electrometer module development and construction – completed end of April 2013 • Prototype and detector testing - May 2013 to present • Documentation submitted to AD ES&H - October 2013 • ES&H Section Approval - May 2014 • Allows $2M risk for mu2e to be retired • Cost of TLM systems about $200k A. Leveling

  12. What does preliminary approval mean? • We can build, install, AND connect systems to the RSS • First application is Booster • A system covering the entire ring will be installed later this year • A parallel section of detector already installed in Booster (P10-12) will be compared with its new companion for a period of 1 year • Assuming required documentation is submitted and testing period goes well, we could be expect FINAL APPROVAL in September 2015 A. Leveling

  13. Other applications to be studied before final approval • NuMI beam line • Already under study since 9/2013 • MI52, slow resonant extraction at MI • MI30 collimation section • ASTA • By the time TLMs are required for mu2e, their use will have been well established A. Leveling

  14. Extra slides A. Leveling

  15. A. Leveling

More Related