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   Project Coordinator
   Prof. Theo Zouros
   Atomic & Molecular Physics
   Dept. of Physics
   Univ. of Crete, PO Box 2208,
  . GR-71003 Heraklion
   e-mail: tzouros@physics.uoc.gr

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Home > Work Packages > WP1 - Beamline
Work Packages

Work Packages: WP1  WP2  WP3  WP4  WP5  WP6  WP7  WP8  WP9  WP10  WP11  WP12 Timetable

Work Package 1: Beam line design and construction

Link to the Demokritos Tandem accelerator description

Figure 1 : Panoramic photo of new beam line as of Dec 23, 2013. Spectrometer chamber and target 6-way cross not yet connected seen to the left.

Figure 2 : Photo of new beam line connection to targer 6-way cross on Jan 24, 2014 showing also the change in the order of the beam line elements.

Figure 3: 3-D schematic of beam line design (Feb 2014) showing quadrupoles, magnetic steerers, 1 set of 4-jaw slits (upstream slits), turbo pump and beam profile monitor.

Figure 4: View of magnetic steerers (coils on beamline) and their power supplies below them

Figure 5: Panoramic photo of new beam line as of May 2, 2014. Spectrometer chamber and target 6-way cross now connected.

Figure 6: Photo of Beam Profile Monitor (BPM) controller box (down just above NIM crate) and oscilloscope (top) viewer in Control Area of Tandem.

Figure 7. Schematic of beam line vacuum components

Figure 8. Photo of the inside of the Beam Profile Monitor (BPM). Visible on the left is the motor and shaft of the rotating wire. The metal shield lining the inside of the beam line is connected to the BPM signal. The curved rotating wire can be seen .

Figure 9. Photo of the image of the ion beam (optimized for highest beam through the gas cell into FC2 of about 7nA with about 20nA in FC1) on a home made phosphorus viewer hanging right under the target gas cell. The image was estimated to be around 3 mm x 3 mm while the entry to our gas target cell is a hole of 2 mm diameter. Improvement is clearly needed. The beam is 18 MeV C4+. Slits 2 are wide open.

Figure 10. Same as Fig. 9 above, only now slits 2 have been set at 3 mm x 3mm

Figure 11. Beamline distances between various elements. Details of various parts can be seen in some of the previous figures.

Figure 12. Calibration formulas for the two ion beam bending magnets at the Dimokritos tandem. I is the magnet current in Amps (A) and f is the nmr frequency (only for the analyzing magnet). The calibration constant kR[2] applies only to the APAPES beam line at L45 (Red target area room).

Description of work package

Work Package



Month 1



Month 15



WP1: Beam line design and construction


Research Teams:

RT1, RT2, RT3

1.1 Optics design of complete beam line The optics of the entire accelerator will be checked with the CPO code TRANSPORT and compared to real beam conditions.  Then the optics of the new beam line will be designed starting from the switching magnet port L45. This will determine exactly what and where to place steerers, quadrupoles, beam monitors, slits and the optimal length to the target for highest transmission.

1.2 Beamline construction Using the optics design the new beam line will then be constructed. This includes the beam tubing, support stands, placing the focusing elements at the right place, adding gate valves, pumping ports, vacuum gauges, etc.  The machine shop will be used for many of the required constructions. Materials needed for beam line and optical elements already exist, but might need repairs.

1.3 Optical alignment of new beam line Will be performed with a telescope whose stand has to be built and aligned with alignment mark at accelerator switching magnet.

1.4 Vacuum test of new beam line A turbo pump with fore line pump will be needed to bring the beam line to a vacuum of 5Χ10-7 Torr or better. If pumps not available they will have to be ordered and bought.

1.5 Test new beam line transmission with ions from TANDEM Once under vacuum fluorine or oxygen beams will be used to test beam line transmission through slits by recording ion current at the end of the beam line and comparing to current at switching magnet and expectations of CPO TRANSPORT code.


1 Report and possibly part of BS, MS or PhD thesis

WP1: Table of Activities in progress

CompletedActivityTarget Date
Ion Beam Optics study of L45 completed using MAD code (by N. Tsoupas) 
Jan 2012
Tender for vacuum equipment announced  
Dec 2013
Order for vacuum equipment placed
Feb 2013
Vaccuum equipment arrived at Tandem lab
Jun 2013
O-rings and gaskets ordered and received
Jul 2013
Set upstream slits on ion optics axis (alignment)
SLITS1 Settings: U
p = 4.84, Down=2.65, Left=3.80, Right=2.64
Dec 2013
L45 Beam line assembled, optics elements placed in position, vacuum pumps installed, Alignment slits and procedures checked, support structures for chamber and target 6-way cross build, vacuum tests of beam line and chamber succesful. Vacuum attained1.3 x 10-7 Torr in spectrometer chamber, 2.5 x 10-7 Torr in target 6-way cross, and 1.2 x 10-7 Torr in beam line before target valve.
Dec 2013
Connection of spectrometer chamber and 6- way cross to beam line (Jan 24, 2014)
Jan 2014
Bought analog oscilloscope for beam profile monitor
Feb 2014
Tender for BPM controller announced - ended unsuccessful
Feb 2014
Bought pneumatic Faraday cup and magnetic steerer controller and power supplies
Feb 2014
Pneumatic Faraday cup installed in front of 6-way cross
Feb 2014
L45 Dipole magnet power supplies connected
Feb 2014
First ion beam transmission test completed Feb 21, 2014 with isolation valve closed, L45 dipoles on but L45 steerers off.
Measured 230nA in FC4 (before isolation valve) with 10 x 10 mm slits SL1 (after switcher but before the dipoles) and 400nA in FC3 just before the switcher magnet. Beam: 1 MeV protons
Feb 2014
L45 Magnetic steerer power supplied connected
Feb 2014
BPM controller and oscilloscope connected to Tandem Control room area
Apr 2014
First ion beam transmission test with isolation valve open, L45 dipoles on, L45 steerers on all the way to last FC. [June 6, Used for tests 2 MeV proton beam]
Jun 2014
First ion beam transmission tests with heavy ions while measuring projectile Auger electrons (gas cell in) [July 23-30, 12 MeV C4+ beam (HE=4μA, Analyzed=70nA, FC2=3nA) ]
Jul 2014
BPM tests - BPM1 successful, BMP2 noisy with no beam signal
Jul 2014
Wrote (AL+TZ) excel program (SLITS-BEAM-ANGLE.xlsx) to test in a purely geometrical model the effect of various aperture sizes of the slits and the gas cell on the beam transmission and bkg.
Oct 2014
BPM2 tests and trouble shooting to find source of noise and lack of signal. BPM2 removed and short found and repaired.
Oct 2014
Small bellows installed (when BPM2 removed) between SLITS1 and quadrupole. Beam line was not moved so SLITS1 settings assumed to be the same.
Oct 2014
BPM2 tests with proton beam, exchanged preamps, moved oscilloscope and SSA5 unit to BPM2 - cable connection OK, preamps OK, finally also got BPM2 to show signal with real beam after palying a bit with accelerator optics on the HE end and after the analyzing magnet. BPM2 preamp needs to run on most sensitive scale.
Nov 2014
First foil post stripped beam transmission tests
Nov 2015
First gas post stripped beam transmission tests
Nov 2015
Further tests on terminal gas stripper
Dec 2015
Final Report on work package completion
Dec 2015

WP1: Deliverables

Additional related results:

WP1: Technical Notes

WP1: People involved

  • Prof. Theo Zouros - MRG RT1 (UoC)
  • Ioannis Madesis (PhD student) - GEC RT1 (UoC)
  • Aggelos Laoutaris (MS student) - GEC RT1 (NTUA)
  • Dr. Tasos Dimitriou (Postdoc) - GEC RT1 (UoC)
  • Dr. Sotiris Harissopulos - MRG RT2 (INP Demokritos)
  • Dr. Tasos Lagoyannis - MRG RT2 (INP Demokritos)
  • Dr. Mihalis Axiotis - GEC RT2 (INP Demokritos)
  • Miltos Andrianis - GEC RT2 (INP Demokritos)
  • Dr. Nick Tsoupas - GEC RT1 New Invited Collaborator (BNL)
  • Prof. Manolis Benis - MRG RT3 (UoI)

WP1: Documents

WP1: References

Last Update: 04/04/17 20:34:24

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