• Why are the dots on the “Diagnostics in focal plane of Spectrometer” so evenly spaced?
• What is the real world example of measuring emittance?
• (2) Describe the focal plane diagnostics of the spectrometer in more detail
• (2) l doesn't appear to have a dependence on anything. Can you clarify how l(t) transforms? How exactly is l define?
• Can you show a (x|a)!=0 case
• (4) Why is sigma matrix symmetric? What is definition of sigma_21? How do we create the 6×6 ellipse matrix?
• How does the x-Theta measurement setup look like (measure orientation of ellipse)
• Definition of Louisville Theorem?
• How do we define the central ray?
• R11, R12, R21, R22 - can more than one be zero?

Answers

• Does the kinematics calculator include anisotropic gamma radiation?
• Why is the angular acceptance fixed?
• Beam spot and divergence in front of target, focusing necessary to minimize (x|a)?
• If (x|a) is non zero, how does that affect the resolving power?
• Rejection requirements were unclear
• Is x_0 the half beam spot size?
• definition of rejection for detectors
• What is the meaning of the interpolation line of the charge state distribution?
• Are separators ever compromised by space charge effects from large beam currents?
• What limits the systematic errors in measurement efficiency, transmission, charge state population?
• How significant can be the background in a (p,g) experiment from target impurities?
• Notation: is there a difference between (x|d)d_1, (x,m)dM/M, and (x|\Delta M) \Delta M/M?

• 1) Does COSY allow implementation of higher order corrections in dipoles?
• 2) Why dipoles doublets instead of one large dipole?
• 3) Definition of K, T, and C in dispersion matching.
• 4) Define fringe field.
• 5) Define Rogowski profile.
• 6) Explain H and K coil in K600 Spectrometer. Why quad inside K600?
• 7) HO in K600 Spectrometer.
• 8) How to use reconstruct the scattering angle at target from focal plane measurement? Setup of multi-slit for angle calibration, drift between target and multi-slit.
• 9) Discuss only one spectrometer (e.g. K600, Grand Raiden, Big Karl).
• 10) Explain magnetization of ferro-magnetic material.
• 11) p. 14 Why not 0 deg with beam (for dispersion matching)?
• 12) Will permanent magnet saturate material. Similar to coil generated fields?
• 13) Why is dispersion matching needed?
• 14) Can EFL be measured?

Answers

• 1) How does COSY calculated the fringe field?
• 2) How important are accurate fringe field measurements for SECAR and St. GEORGE?
• 3) What is the meaning of the rectangles in COSY graphics output?
• 4) In an achromatic fragment separator, do you need a slit and/or a wedge in the dispersive intermediate plane.
• 5) In a gas filled separator are all charge states collected in one location?
• 6) How does a wedge restore the achromaticity in a fragment separator?
• 7) What is the purpose of the DSR (Spin dipole) in front of GRAND RAIDEN focal plan?

Answers

• 1) Why are there 189 Characteristic Rays (see Procedure CHARAY)?
• 2) How realistic is Gaussian distribution for the incoming beam?
• 3) Difference between dispersive focus and achromatic focus.
• 4) On ST. GEORGE the reactions that push the energy acceptance (+/-8%) also pushes the angular

acceptance (+/-40 mrad). This doesn’t seem to be true in SECAR: 15O(p,g)19Ne pushes the energy

     acceptance (+/-3.1%) but not in the angular acceptance (only +/-15.6 mradvs. SECAR’s +/-25 mrad 
     acceptance). Is there a reason SECAR was designed with angular acceptance so much larger than 
     the energy acceptance?
* 5) Purpose of SECAR Section 3?
* 6) On slide 6, what is the meaning of the arrows the Effective Field Length and Good Field Regions?
* 7) Extended target for SECAR?
* 8) Engefunction (not from this Lecture)?
* 9) Is Q1 (Quad + Hex) used or only a design feature?
* 10) x_HO= (x’|x)*2_0 + HO, how are the higher order terms (HO) added
* 11) Clarify D in the definition of the Nominal Beam definition
* 12) Why is the alignment adjusted before and after the ion optical element?
* 13) Can the recirculatory-ring for projectile beam increase the nuclear reaction rate? I.E. can we return the projectile beam (passed through the target) to the beam again.
* 14) Alignment example not clear.
* 15) Does higher order effects give us details about the initial beam characteristic? Or do HO effects tell us that the beam line is different than what we think? ( e.g. field imperfections in the magnets etc.)