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Run Plan for Diffusion Experiment at RIKEN

Run Plan for Diffusion Experiment at RIKEN. Fei Lu May 15 th , 2012. O utline. Introduction Experimental Setup Brho “Safe” Region Fragments Calculation Compare Beam Charge States Measurement Al Degrader. 1. Introduction. 1.1 Data taken at MSU ( Exp 07038 ).

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Run Plan for Diffusion Experiment at RIKEN

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  1. Run Plan for Diffusion Experiment at RIKEN Fei Lu May 15th, 2012

  2. Outline • Introduction • Experimental Setup • Brho“Safe” Region • Fragments Calculation • Compare • Beam Charge States Measurement • Al Degrader

  3. 1. Introduction 1.1 Data taken at MSU (Exp 07038) • 112,118,124Sn + 112,118,124Sn • ~5 mg/cm2 Targets • 70 MeV/u beam energy • Event rates 200-300/s • Beam Rate 2*107/s to 6*107/s • Millions of events:

  4. 1.2 RIKEN Experiment Proposed dates: Nov 29 to Dec 12, 2012 Primary beam: 124Xe (10-30 pnA) 124Sn Beam is not available Proposed beams : 108Sn and 112Sn Proposed reactions: • 108Sn + 112Sn • 108Sn + 124Sn • 112Sn + 112Sn (referenced to MSU) • 112Sn + 124Sn (referenced to MSU) Calculations use beam intensities in the proposal based on 100 pnA of 124Xe beams

  5. 2. Experimental Set up Microball from WU Scintillator & degrader foil ladder Chamber from RIKEN

  6. Experimental Setup (It turns out that the beam intensity is only 20% of what is written in the proposal and here) Zero Degree Spectrometer BigRIPS Target Slits Fast Plastic Scintillator with a hole in the center: Polystyrene ,C8H8, 1.06g/cm3, 125 micron

  7. 3. Brho “Safe” Region Avoid the beam Consider different reactions at the same time. (In current setting, the same fragments from different reactions have the similar Brho. ) Conclusion: choose the Brho region less than 2.58.

  8. 7. Al Degrader (For Plan A) Use the Al to replace the target to turn the beam into the fragments Brho region. (No target, No Fast Plastic) 108Sn: 112Sn:

  9. 8. Discussions Presentation by Isobe in the next meeting • Design and construct the mount to hold the microball. • Need details of the target ladder design. How it will fit through the microball and size and number of target frames? • Need details on a 2nd target ladder to hold the degrader foils and the scintillator. • Need to connect the chamber to the Zero Degree Spectrometer. • Do you want to use the MSU scintillator used in Jack’s experiment? If so, should we send that with the group going to the RIBF user meeting? • Can we use the RF time to determine the beams? RF time will not be give the best PID at the focal plane. • Does the focal plan detectors have total energy information to do the charge state identifications. • We need beam tuning to decide on the size of the beam • Event rate • DAQ read out and online analysis

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