PSB-ISOLDE transfer line

1
PSB-ISOLDE transfer line

• PPC 13/2/98
• Mats Lindroos

2
History of optics changes

• 1995
• Change of final focus to spread beam over the
  entire target surface
• First test with staggered beam
• 1996
• Change of BTM.BHZ10 and position of final
  quadrupole doublet demanded a new optics
• 1997
• Staggered beam operational

3
History of beam observation

• 1995
• Mobile SEM-grid in ISOLDE target container
  available
• and used for MDs
• 1996
• Two pick-ups installed in ISOLDE line
• Separate transformers and SEM-grids installed
  before each ISOLDE target position
• BLM surveillance
• 1997
• Beam observation with transformers and pick-ups
  possible for staggered beam
• BLM surveillance application program

4
Mechanical modifications to ISOLDE line

• 1996
• ISOLDE target finding dipoles moved to permit
  larger beam sweep range and to make place for
  SEM-grid and beam transformer
• 1998
• Support and alignment of SEM-grid before ISOLDE
  target positions to be modified

5
Improvements

• ABS using existing pick-ups and scintillating
  screens
• ABS using quadrupoles
• Development work for BeamOptics started on
  function which makes use of beam observation at
  ISOLDE SEM-grid
• MD to understand discrepancy between theoretical
  opticals and used optics.
• Study of four-ring staggered beam option

6
ISOLDE staggered beam
ISOLDE 1 GeV
PSB rings
PS ring
Ring 4
4
3
Ring 3
2
Ring 2
Ring 1
1
h1

• Pulsed elements in transfer line limits
  staggering to 600 microseconds duration
• Fast dipole magnet (125 microseconds rise-time)
  could be made and installed in the place of the
  RF-dipole
• laminated or ferrite (exists)
• A slow ejection bumper power supply (under
  construction) could be used

7
Wish list

• Establish procedures so that experiments can ask
  for change of intensity of delivered beam
• Reduced radiation in PSB and transfer line
• Saves ISOLDE targets
• ISOLDE VISTAR
• Is ISOLDE running?
• Who is the EIC?
• Who is the responsible physicist?
• What state is the target in?
• GPS/HRS?
• Establish call list for beam requests when ISOLDE
  is down