FELICE

Level 0 Felice user stations

Specs

Beam
Energy	18-45 MeV
Undulator
period (λu)	60 mm
mo. periods	46
KRMS (range)	0.4–1.7
Rayleigh range Mol. beam	55 mm
Rayleigh range FTICR	82 mm
Type	Quasiperiodic PPM

FELICE is the beam line of FELIX operating from 5–100 µm and allowing intra-cavity experiments.

Procedures

• Felice cavity alignment
• Felice spectrometer Mac address spoofing
• JAI cameras Felice Experiments

Shutdown Procedure

• File:Shutdown FELICE quick guide.docx: how to shut down FELICE
• File:Shutdown FELICE.docx: how to shut down FELICE

Attainable wavelengths as function of beam energy

Gap → ↓ Energy (MeV)	23	25	27,5	30	32,5	35	37,5	40	42,5	45	47,5	50
15	143,22	122,03	101,29	85,50	73,50	64,36	57,40	52,11	48,08	45,01	42,67	40,89
17,5	105,22	89,65	74,41	62,82	54,00	47,28	42,17	38,28	35,32	33,07	31,35	30,05
20	80,56	68,64	56,97	48,10	41,34	36,20	32,29	29,31	27,04	25,32	24,00	23,00
22,5	63,65	54,23	45,02	38,00	32,66	28,60	25,51	23,16	21,37	20,00	18,97	18,18
25	51,56	43,93	36,46	30,78	26,46	23,17	20,66	18,76	17,31	16,20	15,36	14,72
27,5	42,61	36,31	30,13	25,44	21,87	19,15	17,08	15,50	14,30	13,39	12,70	12,17
30	35,81	30,51	25,32	21,38	18,37	16,09	14,35	13,03	12,02	11,25	10,67	10,22
32,5	30,51	25,99	21,58	18,21	15,66	13,71	12,23	11,10	10,24	9,59	9,09	8,71
35	26,31	22,41	18,60	15,70	13,50	11,82	10,54	9,57	8,83	8,27	7,84	7,51
37,5	22,92	19,52	16,21	13,68	11,76	10,30	9,18	8,34	7,69	7,20	6,83	6,54
40	20,14	17,16	14,24	12,02	10,34	9,05	8,07	7,33	6,76	6,33	6,00	5,75
42,5	17,84	15,20	12,62	10,65	9,16	8,02	7,15	6,49	5,99	5,61	5,32	5,09
45	15,91	13,56	11,25	9,50	8,17	7,15	6,38	5,79	5,34	5,00	4,74	4,54
47,5	14,28	12,17	10,10	8,53	7,33	6,42	5,72	5,20	4,79	4,49	4,26	4,08
50	12,89	10,98	9,12	7,70	6,61	5,79	5,17	4,69	4,33	4,05	3,84	3,68

Cavity Length

switches	Molecular Beam position (µm) DS end mirror	FTICR position (µm) US end mirror	remarks and dates last checked
home position	0	0	by definition
cavity zero	271	-1217	MB 08/04/2021, FTICR 19/05/2021
negative limit	-1262	-2246	MB 03/09/2020, FTICR 09/09/2020
positive limit	858	1130	MB: 858 is the maximum reachable, after that the motor probably loses contact with the stage (03/09/2020), FTICR: 1330 (09/09/2020)

(i.e. the stated cavity zero position is relative to the home positions).

Debug info

On the upstream side, the homeswitch is active towards the negative limit switch, and inactive towards the positive limit switch. A positive movement of the stepper motor motor corresponds to a longer cavity length. Because of the nature of piezomotors, the step size is not equal in both directions. At the position of the home switch +10000 steps corresponds to +6 µm, and -10000 steps is ca. -23 µm.

Mirror Settings

After changing from Molecular Beam to FTICR and vice versa:

• Cavity: home both US and DS
• CL zero: set to known last value
• X/Y-positions for all mirrors need to be homed

mirror	Molecular Beam position (steps)	FTICR position (steps)
DS	H -78 V -125	H 78 V -330
US	H -133 V -129	H 60 V 0
Angle	H 182 V -76	H -186 V 239
End	H -36 V 56	H 232 V -17
Last updated	2025-02-24	2025-02-18

Diagnostic station

alt text

Software for diagnostics

Spectrum analyzer

For the Felice spectrum analyzer there are two GUI interfaces "FELICE spectroclient.exe" and "sa_flc_pyro_gui_v101.exe". The program "sa_flc_pyro_gui_v101.exe" is only needed in special cases.

• For correct working of showing the wavelength use the even+odd setting from the pyro_gui interface. This will ensure the correct dispersion.
• startCh needs an offset of about 5 channels due to strange outlines
• endCh' chould be set normally at 256, if selected in the pyro GUI to even or odd the channels should be set to 128 but at the moment not advisable.
• FSSP (Felix super stabilization program): if switched on will subtract a baseline.
• CalibrCycleON: switched on will try to make an offset array of each channel to zero it. When done the switch will turn gray again.
• CalibrOffsetOn: if set ON this will use the offset array to compensate the baseline to zero.

Server program (by Guus Tielemans) runs on Feloce.

Required connections:

• RS232 connection to control Princeton Instruments Grating spectrometer (male DB9 feedthrough on DS)
• Rijnhuizen built array detector (female DB9 feedthrough on DS)

\\isolator\flare-rinst\Felix\Felix_prg\SA_felice\FELICE spectroclient.exe

Molectron power meter

Server program (by Guus Tielemans) runs on Feloce.

Required connections:

• TTL trigger for power meter
• GPIB-ethernet controller connected to Molectron controller
• Power head connected to input Molectron (LEMO feedthough connection on DS)

\\felixdisk\msd-lab-clusters\labview-programs\PowerscanFELICE\v200220\PowerscanFELICE.exe

Note: this is compiled in Labview 2017, due to NI support for the ethernet Gpib controller being discontinued in later versions.

alt text

Migrating diagnostic station

Representative output energies

Molecular beam

Power measurements done with Coherent EPM1000 power meter, in combination with Molectron 750LF-1 power head. Responsitivy 10.8 V/J

FTICR

More details

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Notes on how to convert the outcoupled pulse energy into the macropulse energy within the cavity

Timing & Diagnostic connections on the patch panel in the FELICE hall

• Felice cavity dumping requires a phase-stable trigger pulse: route E5 through the black RF locking box (named _Henny_ in the diagram above).
• The FTICR won't run with short trigger pulses, requires at least 10 us wide pulse
• to enable timer E5 to have long pulse lengths, it should be configured as follows

Troubleshooting

• Is the Pyro hooked up well?
• Downstream or Upstream mirror can't be changed (select mirror => Go remains greyed out)? Soft restart of the Subsystem will do the trick. (This button is greyed out for the first few minutes after start of the GUI.)
• If FELICE does not trigger even though all lights are green, check to see if there is either a) a terminator or b) a BNC cable connected to the top-left BNC connector (M110) on the FELICE patch panel behind the cluster source. It should be open.
• FTICR specific:
  • Is the Faraday cup out? (You should be able to see the alignment HeNe on screen 7S80(near end mirror).)

• FELICE Molecular beam specific:
  • Is the cavity-dump slab out? (You should be able to see the alignment HeNe on screen 7S60 (near end mirror).)
  • Is the experiment not too high? Check for straightness of the bellows between experiment and mirror vessels. Check bestec PC--> Motion control -->V. Value vertical should be between -32 and -28 mm.

Pictures

Downstream tank	Undulator path	Mol. beam	FTICR
MB end mirror tank contents	mirror holder overview - mirror removed	outcoupling mirror and outcoupling window (note that the HeNe is not centered right on the window in this picture)	End mirror on mount with outcoupling hole visible
Outcoupling mirror on its mount	Indicator on the wall near US9 showing HeNe directly from MB angle mirror with MB end mirror and outcoupling mirror removed (and tank open).	Indicator on the wall near US9 showing HeNe directly from MB angle mirror with MB end mirror and outcoupling mirror removed (and tank open).

References and notes

• Rotation of the downstream mirror carousel (YouTube)

Documentation

Overall

\\felixdisk.science.ru.nl\ffg2\Technical Documentation\FELICE

Tech specs

\\felixdisk.science.ru.nl\ffg2\Technical Documentation\FELICE\Technical Specifications.doc 

Reconstruction of intracavity power from measured outcoupled pulse measurement

\\felixdisk.science.ru.nl\ffg2\Technical Documentation\FELICE\Intracavitypower.xls