NEW NEW Ionization Chamber Technology Anne Dabrowski Results on behalf of Mayda Velasco’s Hardware Research group. P. Ball 3, A. Darowski 1, G. Graham.

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Presentation transcript:

NEW NEW Ionization Chamber Technology Anne Dabrowski Results on behalf of Mayda Velasco’s Hardware Research group. P. Ball 3, A. Darowski 1, G. Graham 3, C. Kendziora 2, F. Krueger 2 G. Tassotto 2, G. Ünel 1, M. Velasco 1 1 Northwestern University, 2 Fermilab, 3 Richardson Electronics Lunch Bag Seminar 1 May 2002

Northwestern High Energy Physics Why the need for new Hardware? Modern High Energy Experiments –High intensity beams > particles/ micro second –Radiation Hard –Once-off calibration –Monitor beam line position / background particle flux

Northwestern High Energy Physics Solution: –Ceramic radiation hard ionization chambers. –Either Gas sealed or Vacuum – SEM (secondary emission monitor) Q = I * d * e*A * n * M current read by chamber I – beam intensity (cm -2 s -1 ) (<10 11 cm -2 s -6 ) d – gap size (cm) (~1mm) e – electron charge M – multiplication factor (~1) N – tot num of ion/electron pair/cm (8 for He at atm 98 for Ar at 1 atm) A – elecrode area (cm 2 ) (1 cm 2 )

Northwestern High Energy Physics Basic Description of Design Chamber filled with Gas -- Ionization SIC (< /p/cm 2 /s ) Chamber in Vacuum -- Secondary Emission Monitor SEM (above /p/cm 2 /s)

Northwestern High Energy Physics Basic Chamber Design Fixed volume, Temperature and Pressure changes do not affect calibration Radiation Hard Materials (> Rads) – Ceramic (AL 2 O 3, 94%, 96% ) – Kovar (nickel, iron, cobalt)

Northwestern High Energy Physics Engineering drawing Tolerances: Gap = 1mm +/ ” guard-to-collector = 0.5 mm+/ ” Flatness 0.001”

Northwestern High Energy Physics SIC prototypes

Northwestern High Energy Physics Timeline for Design Development 2000 Richardson Electronics (REL) made Glass Chambers (Inspired by V. Falaleev Design). –Detection observed –Design studies –Change to ceramic because of high tolerances Ceramic design –Electrode changed from round edges to edges square D1 – D2 –Flat for signal collector & guard ring. Multiple chambers produced (7 in all) –gas refilling tested. –Found occasional shorts on due to metal filings inside the chamber…tooling redesign. Believe have the final design –(testing by producing several chambers….already under construction). successful –mass production will start at the rate of 10 chambers/week.

Northwestern High Energy Physics How do they Behave ?

Northwestern High Energy Physics Radiation Physics Calibration Facility (RPCF) Photon Emission 424 R/hr Check chamber quality –Plateau, ionization response, reproducibility Lead to design improvements Determined operational modes –operational voltage, gain voltage, gas type Do pre-calibration before operating in other facilities.

Northwestern High Energy Physics Radiation Physics Calibration Facility (RPCF,FNAL) “Flat mounting” “Side Mounting” Two new Cs 137 sources: Max:1600 Rad/Hr The old source was 424 Rad/Hr

Northwestern High Energy Physics Results (RPCF) Note Slope !! Electrode edges

Northwestern High Energy Physics What Changed? Design 1 vs. Design 2 The electrode edge … Curved Flat Effected slope of plateau … reduced by ~ 70 %

Northwestern High Energy Physics Results D2 vs. D4 Signal > Electrode area

Northwestern High Energy Physics Setup to test chambers at the RPCF– pre-calibration for all SICs Investments: A Keithly electrometer Sensitivity 2 nC Resolution of 0.1 pC Bias current of < 3fA Output of electrometer via GPIB to computer running LabView to a data file. Procedure almost automatic  Good for grad students when calibrating in the summer

Northwestern High Energy Physics Chamber Characterization show no radiation damage after XX protons Chamber filled with He for more than a year No change… Reproduce calibrations

Summary of RPCF Results: Good reproducibility Can measure both small and large currents. Keithley Electrometers and Powers Supplies allows to do good measurements of knee of plateau need to test gas quality of chambers… no degradation see so far. LABview DAQ – user enter customized measurement parameters – automated DAQ Slopes good – but not quite flat… we believe we understand it.

Northwestern High Energy Physics Tests at ATF (BNL) low energy electron beam No saturation below 8*10 9 / p/cm 2

Booster (FNAL) proton source ~1e9 to 1e12 Old  Toroid only for Flux measurement New  Toroid +chamber for Flux measurement & Longitudinal movement for alignment SIC Only 1mm Wire Chamber & SIC

Booster (FNAL) Halo High intensity ~ 1e9 proton source 1.5  s per spill … halo see 1/100 of total beam ONLINE OFFLINE

Northwestern High Energy Physics Booster (FNAL) Plateau in the beam (1.8e11)---saturation (same effects present with design 4) shortens plateau—space charge

Northwestern High Energy Physics Booster (FNAL) – Intensity Scan SEM-like SIC-like No saturation even At ppp (10 -5 torr) Clear … Saturation

Northwestern High Energy Physics Chamber see about 40% Of the beam Beam Moved Need to repeat With vertical movement Beam Profile from Wire chamber

Northwestern High Energy Physics Summary of results from Booster Saturate above e11 in SIC-mode, but no saturation in SEM-mode. When making plateaus: gain observed at 200 V in the beam center, but not seen at 350 V in the “halo” like in the RPCF tests use SWIC electronics for both low and high currents just change capacitors So far no signs of radiation damage … or helium leakage To do… add vertical movement to get proper alignment.

Northwestern High Energy Physics Secondary Emission Monitor– SIC chamber in vacuum Getter - Place a strip of barium under the collector and activate it at about 1000 degree C. Ion Bombardment - Apply a voltage across the electrodes while pumping for reducing atmosphere of H 2. –Richardson used this process on vacuum tubes to torr This look like a very promising way of operating The chambers for >10 11 ppp

Northwestern High Energy Physics Permeation Test– test run for 3-4 days … Helium is not leaking…. The ion chamber was then put in side of a small vacuum chamber and tested using a Dupont Mass Spectrometer leak detector the total leak rate was found to less than 2X10 –10 STD CC P/S. Then the temperature was raised slowly to 100 degree C. Max leak rate < 40X10 –10 STD CC P/S

Northwestern High Energy Physics Conclusion Believe to have a working design that can be operated at : I<10 11 ppp in SIC-mode I>10 10 ppp in SEM-mode 200 chambers to be build with the new tooling design.