1 / 6

ATLAS Upgrade WP4 Face to Face meeting at Glasgow, 13/6/2011 Irradiation activities

ATLAS Upgrade WP4 Face to Face meeting at Glasgow, 13/6/2011 Irradiation activities Richard French, Paul Hodgson –Sheffield Paul Dervan (TL), Gianluigi Casse – Liverpool Maurice Glaser - CERN Graham Beck et al - QMUL John Wilson, David Parker – Birmingham University.

neorah
Télécharger la présentation

ATLAS Upgrade WP4 Face to Face meeting at Glasgow, 13/6/2011 Irradiation activities

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. ATLAS Upgrade WP4 Face to Face meeting at • Glasgow, 13/6/2011 • Irradiation activities • Richard French, Paul Hodgson –Sheffield • Paul Dervan (TL), GianluigiCasse– Liverpool • Maurice Glaser - CERN • Graham Beck et al - QMUL • John Wilson, David Parker – Birmingham University

  2. CERN PS Irrad Update • June Schedule through to end of 2011 • 13/6/2010 16h00 T7 beam Off (Maurice) Cooling down T7 area. (Maurice) • 14/6/2011 10h30 All East area beam OFF (Maurice) • 14/6/2011 11h00 Start T7 Access (RadP) • Taking out IRRAD7 setup (Paul Dervan, R. French, Maurice) = Carbon sample removal • Taking out IRRAD6 setup (AdriaanHeering, Mauricer) • Taking out IRRAD3 setup (AlexandreRozanov, Patrick Breugnon, Maurice) • CMS-ECAL installation on IRRAD3 (Alexander Singovski, Maurice ) • 14/6/2011 11h30-12h00 End of the access • 14/6/2011 12h00 Start setting the 3 x 3 cm2 protons beam

  3. Hardware update • Old K4 chiller system pump burnt out earlier in year. Unknown cause (age is likely). RF to arrange replacement as still needed. • New super monster cooling system purchased and installed, currently will only provide-15c at the cold box so this is a problem. Will investigate on 14/6 as to cause. • Factors that have altered significantly to consider are; • Cooling fluid has been altered from our old spec to one provided by the chiller manufacturer; This is untested with radiation so could be a problem. • Unknown pumping speed. Restrictions in the oil cooler used to radiate heat could slow the fluid – not enough heat taken out • With chiller at 0C and no (hybrid) power, hybrid temps were 0C (+1). So this is a measure of the previous cooling system (including the 36W fan load) (GAB) • Paul’s new software sends text for “no beam” alarm. Allows MG & PS to monitor beam more effectivley as ideally need someone FT to monitor Irrad work. • PS spills, data (RH/Temp etc) are now plotted directly to excel file making overall dose much easier to calculate and tracing of data possible. • PS control PC suffered from multiple crashes, now fixed (memory) so data not lost. Check with Paul Dervan for up to date PS Irradiation information

  4. Dry run at end April/May very smooth. Mechanical and system control hardware was severely delayed by SSC. Final part arrived on 04.06.11 =2 months late. RF now adding liner encoder to Y axis to allow Quadrature signal output for control. PH now finishing programming of control software: Hardware is integrated PC/FPGA chassis with Digital and Analogue IO modules, using single network cable to send/receive data. Farraday cup is used to measure charge from beam (last in line) Ge Spectrometer used to measure foils for callibration. Beam tests on 31st May brought additional difficulties. Birmingham Cyclotron Update Hardware installed May 11 Farraday cup Ge spectrometer Control system working for our beam line

  5. Tests on Birmingham Cyclotron on 31st May, David Parker, Mike Smith, Richard French and John Wilson. Beam profile testing. 350mm • JW- Foil activation was tried successfully – not the standard irradiation of Ni foils (a la CERN and Karlsruhe) but, following earlier investigations of Francesca Fiorini, a Bham Med Phys postgrad, using a Ti foil. The subsequent decay spectrum of was very clear: just two distinct, well separated peaks from annihilation (511keV) and the 1.157MeV scandium decay. This simple calibration looked very encouraging: increasing the activation of Ti foil by a factor two (produced roughly by doubling the exposure time in the beam) resulted in approximately twice the rate of s measured in the hyper-pure Ge detector. 1cm² lost BEAM DIRECTION 280mm Grafchromic film exposure to beam 1cm² just maintained At 26 MeV protons, the fluence we ideally want to run at is1 microA of protons . This is much higher than B’ham have used for damage studies in the past. 1 microA is 6x1012 protons per second, and this will be over an area of 1 sq cm. Multiplying by exposure time, that becomes 2x1016 per hour or 1.6x1017 per sq cm after 8 hours. This is far higher than the current shielding can handle. 110mm 1cm² perfect profile

  6. Future requirements • Not an exhaustive list • Will need to seriously beef up shielding to control room and access corridor as running with 0.5uA is giving unacceptable personal radiation levels in these areas. Ideally we want 1uA beam current. Main source of radiation is Neutrons. This can only be done by adding new shielding. Polycarb granules stacked in 15kg bags works as good low cost shielding, depth and quantity is now being calculated v cost of concrete. • Activation foils required for testing, currently tested with Ti but could do with performing on a spectrum of materials to enable calibration with work at CERN and adding to RADMON work. • Dosimetry will need careful setting up and recording only once we are happy that we have accurate foil calibration. • Sensor mountings etc still not fabricated as unsure of spec and users – need definativeuser list. Tasks to compete urgently . Quantitative measurement of the Grafchromic profiles at the three locations will allow calculation of beam divergenceand scanning pathway. • Although the activation of Ti foil worked very conveniently, this technique will not match our irradiation. Since the decays with a half-life of about 4.0hrs, the activation will be tend to saturate over a typical irradiation run of half a day (say 12 hrs). Activation of Ni foils (where the half-like of is 35.6hrs), the activation will not tend to plateau over our 12hr irradiation. = Irradiation with Ni foil which may be more matched to our work. • Checked Al foil activation at CERN and no use for Cyclotron energy. • Check that our observed rates agreed quantitatively with the beam current measured with the Faraday cup. • PH to finish programming of control system when beam profile over cold box z defined. • RF to finish linear encoder mounting to Y axis and then relay outputs to IO module for speed control. • RF to bring RADMON’s back from CERN along with BPM and Pin Doides for dosimetery.

More Related