Status Report of the RAL Photo Detachment Beam Profile Monitor
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1 Morschach/ Switzerland, HB 2010, 29. Sept. slide 1 Status Report of the RAL Photo Detachment Beam Profile Monitor Christoph Gabor ASTeC, Rutherford Appleton Laboratory (G.Boorman, A.Bosco, D.Lee, J.Pozimski, A.Letchford)
2 Outline of the talk detector of photo detached elect. Morschach/ Switzerland, HB 2010, 29. Sept. slide 2 Front End Test Stand FETS at RAL H- ion beams and its Photo Detachment diagnostics Technical design of the electron detector Experimental results and discussion of achieved measurements
3 The Front End Test Stand is an R&D project suitable for many HPPA like Isis upgrade. 90 sector magnet Morschach/ Switzerland, HB 2010, 29. Sept. slide 3 60mA 70keV 2ms 50Hz Ion Source LEBT 3 Solenoids RFQ 324 MHz 3 MeV MEBT Quads, Buncher, Chopper Diagnostic Beamstop (PD) Diagnostic & Support (PD) Emittance Measurement The beam profile monitor is placed in the first vessel downstream of the ion source and post acceleration system. The beam profile monitor started as a Ph.D. project at Imperial College (David Lee).
4 Photo detachment can be used to diagnose the H- ion beam non destructive. Morschach/ Switzerland, HB 2010, 29. Sept. slide 4 ~75% of cross section with Nd:YAG or 2 nd harmonics non destructive online measurements final aim: tomography (2D) other variants also possible
5 The detector set up to collect the electrons. ~ suppression ring: S = V ~ acceleration sheath: J = + 2 kv ~ grid: G = V ~ Faraday cup bias: B = V ~ magnet current: I = + 1A work done by David Lee Morschach/ Switzerland, HB 2010, 29. Sept. christoph.gabor@stfc.ac.uk slide 5
6 Detector & optical beam path. The diagnostics is integrated in the 1 st (differential) pumping vessel Morschach/ Switzerland, HB 2010, 29. Sept. christoph.gabor@stfc.ac.uk slide 6 Blow up of the electron detector. Opening hole is 50mm in diameter. Optical beam path of the laser.
7 The signal will be sampled and digitized with a current amplifier. Morschach/ Switzerland, HB 2010, 29. Sept. christoph.gabor@stfc.ac.uk slide 7 Electronics: rise time s & resolution pc pC range 20 bit resolution 2 integration cycles at 103 s 25Hz rep. rate IN1B delivers more stable results
8 The background is large compared to the photo detachment effect & needs carefull substraction. Morschach/ Switzerland, HB 2010, 29. Sept. slide 8 High beam losses cause a large background signal. Two different types of sources affect the background: slow variations mean (stability of the ion source fast variations SD (secondary effects, ion beam noise) It is NOT possible to run the detector as it is supposed to do. Needs to find empirical settings to min. background + max. PD electrons.
9 Comparison of some measurements from different days/ different detector settings. Morschach/ Switzerland, HB 2010, 29. Sept. slide 9 Grid and Bias have strong impact variation of the means secondary effects Linear Regression suffers from instabilities caused by the ion source.
10 Summary and Outlook. Morschach/ Switzerland, HB 2010, 29. Sept. slide 10 o Photodetachment diagnostics at RALs front end test stand o First experimental tests show small signal o Beam loss causes problem, i.e. background o Until end of laser loan more measurements are planned o Move BPM to another place o Redesign detector to minimize interference with beam o nothing said about: final aim of tomography, reconstruction, emittance photo detachment (2D and 4D phase space)
11 Some extra slides Morschach/ Switzerland, HB 2010, 29. Sept. slide 11
12 @ Gary Boorman Morschach/ Switzerland, HB 2010, 29. Sept. slide 12
13 Faraday Cage and Low Energy Beam Transport Section of the Beam Line. Morschach/ Switzerland, HB 2010, 29. Sept. slide 13
14 Similar to the jacket sheeth the suppression ring also influences the FDC signal. Morschach/ Switzerland, HB 2010, 29. Sept. slide 14 Variation of the suppression ring voltage to avoid penetrating others than photo detached electrons into FDC.
15 Morschach/ Switzerland, HB 2010, 29. Sept. slide 15 Different background signals vs. beam energy Detector chosen to negate signal at 35keV beam energy.
16 Influence of the detector ( jacket, acceleration sheath) on the transmission of the beam. Morschach/ Switzerland, HB 2010, 29. Sept. christoph.gabor@stfc.ac.uk slide 16 Influence of the detector to the transported beam current.
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