1 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

CERN PS Irrad Update June Schedule through to end of /6/ h00 T7 beam Off (Maurice) Cooling down T7 area. (Maurice) 14/6/ h30 All East area beam OFF (Maurice) 14/6/ h00 Start T7 Access (RadP) Taking out IRRAD7 setup (Paul Dervan, R. French, Maurice) = Carbon sample removal Taking out IRRAD6 setup (Adriaan Heering, Mauricer) Taking out IRRAD3 setup (Alexandre Rozanov, Patrick Breugnon, Maurice) CMS-ECAL installation on IRRAD3 (Alexander Singovski, Maurice ) 14/6/ h30-12h00 End of the access 14/6/ h00 Start setting the 3 x 3 cm2 protons beam 2 Period Start StopComment P /14/2011 8:00:00 AM6/22/2011 8:00:00 AM7 Days Low fluence CMS-ECAL on IRRAD3 P /31/2011 8:00:00 AM 6/14/2011 8:00:00 AM10 Days Low fluence ~ 2E13p/cm2/h P /1/2011 8:00:00 AM 9/13/2011 8:00:00 AM35 Days Low fluence ~ 2E13p/cm2/h P /13/2011 8:00:00 AM 10/18/2011 8:00:00 AM35 Days Low fluence ~ 2E13p/cm2/h P /13/2011 8:00:00 AM 10/31/2011 8:00:00 AM 13 Days Low fluence ~ 2E13p/cm2/h Not sure!

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. 3 Check with Paul Dervan for up to date PS Irradiation information

Birmingham Cyclotron Update 4 Dry run at end April/May very smooth. Mechanical and system control hardware was severely delayed by SSC. Final part arrived on =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 31 st May brought additional difficulties. Hardware installed May 11 Control system working for our beam line Farraday cup Ge spectrometer

Beam profile testing. 5 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 6x10 12 protons per second, and this will be over an area of 1 sq cm. Multiplying by exposure time, that becomes 2x10 16 per hour or 1.6x10 17 per sq cm after 8 hours. This is far higher than the current shielding can handle. 350mm 280mm 110mm 1cm² lost 1cm² just maintained 1cm² perfect profile BEAM DIRECTION Tests on Birmingham Cyclotron on 31 st May, David Parker, Mike Smith, Richard French and John Wilson. Grafchromic film exposure to beam 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.

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 definative user list. Tasks to compete urgently. Quantitative measurement of the Grafchromic profiles at the three locations will allow calculation of beam divergence and 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. 6