Focal Plane Scanner Jeff Martin University of Winnipeg
- Slides: 25
Focal Plane Scanner Jeff Martin University of Winnipeg with: Jie Pan, Peiqing Wang, David Harrison
Motivation • Q 2 determination, background studies, all done at 10 n. A using tracking system. • Region III operable up to 100 n. A. • Qweak production running 180 A. • Need a way to extrapolate over 3 orders of magnitude.
Qweak Focal Plane Scanner • A scanning detector with small active area to sense high-energy electrons, operable at any beam current. • Similar technique used in E 158 and HAPPEx. • For E 158, it was used to determine optics parameters, confirm Monte Carlo predictions of rates.
Scanner Principle pre-rad quartz radiator Č scattered electrons air-core light pipe PMT Design criteria: • 1 cm 2 active area. • 1 MHz max rate allows operation in counting mode with two PMT’s. • operable at both high and low current.
Scanner Concept scattered electrons side view beam view
Implementation in Qweak x-axis motion • • y-axis motion Č-bar 2 D motion assy scans behind Č-bar Mount in any one octant at a time Attach to fixed support structure Motion assy mounted “inside” Č-bars
Recent Progress on Scanner • 3/06 – Approval from CFI received (detector lab) • 4/06 – Funding from NSERC received (scanner) • Report for today: – Start of prototyping tests related to detector performance. – Simulation of detector performance. – Mechanical design • Mounting and 2 D motion assy. • Detector assy.
Prototyping Tests (Pan, Wang, Harrison) • 2” tube lined with “Alzak” sheet (aluminum sheet with PVD aluminum on top, and clear anodized) “Anomet” “MIRO 2”
Prototyping Tests – Cosmics Testing upper trigger test detector lower trigger inside Alzak tube is a small test scint mounted on a plunger
Prototyping Tests • MCA reads out shaped pulse height. • Begun work with small scintillator samples. (Plan to transition to quartz) • Begun work with high reflectivity light pipes. • Electronics to be replaced with CFI funded detector lab.
Simulation • Builds on Qweak. Sim (K. Grimm, M. Gericke) • Currently at stage of benchmarking vs. E 158 NIM article.
Simulation – comparisons to E 158 NIM E 158 Jie Pan • work in progress • q. e. model not right, etc. different prerad
Mechanics • support structure (P. Medeiros, G. Smith) • 2 D motion assy. • detector assy. (P. Wang and G. Mollard @ UM)
Mechanics • support structure – early 2006, decision to not use R 3 rotator – plan now is to mount to fixed Cherenkov-bar support structure, most of device in towards beamline. – motion octant-to-octant possible by bolting device in place – need drawings! • 2 D motion assy. – budgetary quote from Bosch-Rexroth. – no progress other than some discussions with P. Decowski (E 158 scanner) on rad hardness.
Mechanics • detector assy. – initial 2 D CAD drawings – begun 3 D Solid. Works model (P. Wang) – eventually, support from UM shop (G. Mollard) starting on Solid. Works design
Summary and to-do list • Answer prototyping/simulation questions: – – radiator design (quartz? scint? size? tilt angle? prerad? ) tube diameter (backgrounds) two-tube layout (backgrounds and fiducial area) establish viability of coincidence technique (rates) • Mechanics – support structure – need P. Medeiros’ time. – purchase 2 D motion assy. and program it. – design and build a mechanical mock-up of detector assy and then a realistic detector
Additional Uses of a Scanner Detector • Scan over large fiducial region, into inelastic region, over Cherenkov bar light guides, to get additional confidence in backgrounds. • “Light map” can be compared to simulation. • Q 2 extrapolation/determination – mini-torus setting during production running? – gas vs. liquid target extrapolation? – at least, complementary to region III.
Implementation in Qweak x-axis motion y-axis motion Č-bar • 2 D motion assy scans behind the Č-bar • Mount in one octant, attach to fixed support structure
Implementation in Qweak
Implementation in Qweak
Implementation in Qweak
Implementation in Qweak
• Expected rates at 180 A • Max rate = 1 MHz courtesy J. Mammei
Procedure • Measure light distribution with scanner at low beam current acceptable to region III and Cherenkov bar coincidence. • Measure light distribution with scanner at 180 u. A. • If they are the same, region III/Cherenkov light distribution believable at 180 u. A to high confidence. – Note: scanner light map will not be the same as the region III/Cherenkov bar coincidence map.
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