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EDMS NO.
3355734
VALIDITY
Released
REV.
1.0
DOI: 10.5281/zenodo.17288030
RADNEXT T ansna ional Access Summa y Repo
P ojec i le
A 2.56 GHz Radia ion Ha dened F ac ional-N Sub-sampling All-
Digi al Phase-Locked Loop
P ojec TA iden i ie
TA11-370
Gene al applica ion
High-ene gy accele a o s
Type o es
SEE
G oup leade , Ins i u e
Paul Le oux, KU Leu en
Co-au ho s, Ins i u es
Je ey P inzie, KU Leu en
Qichao Ma, KU Leu en
Da e(s) o he expe imen
16 h May, 2025
Facili y
RADia ion E ec s Facili y, Uni e si y o Jy äskylä
Amoun o access g an ed
6 h
Objec i es o he expe imen s
The goal o his p ojec is o s udy he adia ion pe o mance o he p oposed ac ional-N Sub-
sampling ADPLL and o e i y whe he ou adia ion-ha dened-by-design echnique can enhance i s
adia ion ole ance.
1. Ve i ying he e ec i eness o he TMR s a egy.
2. Tes ing he SEE c oss sec ion o he DTC, which can cause aul y Bang-Bang Phase De ec o
(BBPD) ou pu s. A hea y ion es will de e mine i such dis u bances a ec SSADPLL
ope a ion.
3. Building on ou p e ious wo k, which demons a ed ha he as eco e y algo i hm can
mi iga e dis u bances om SEEs in he induc o o an in ege ADPLL [2], we will now e i y his
algo i hm in he ac ional-N SSADPLL.
This s uc u ed app oach will p o ide insigh s in o po en ial imp o emen s and alida e he obus ness
o ou adia ion-ha dened echniques.
Expe imen es epo
The ADPLL con igu ed in h ee di e en modes was exposed o h ee di e en ions (Xe, K , and A )
wi h Linea Ene gy T ans e (LET) alues anging om 58.5 MeVcm2/mg o 9.7 MeVcm2/mg. Fo each
ion, a luence o 1.5×106 ions/cm2 and a lux o 1000 ions/cm2/s was achie ed o each ADPLL
con igu a ion. The es s we e conduc ed in ai mode wi hou il ing.
Du ing he es , A 40-MHz clock p o ided om a SKYWORKS SI570-PROG-EVB boa d was employed
EDMS 3355734 .1 s a us In Wo k access Res ic ed
PDF om TA11-370-Zenodo.doc modi ied 2025-10-07 16:07
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EDMS NO.
3355734
VALIDITY
Released
REV.
1.0
as he e e ence clock. Di e en con igu a ions including loop gain, swi ching ime o each bandwid h
le el and he h eshold o igge he as eco e y can be se h ough SPI. The ADPLL ope a ed a
2.56 GHz wi h a p escale o 2 a he ou pu o DCO, yielding an ou pu equency o 1.28 GHz. To
measu e he ADPLL ou pu equency, i is i s ly down-con e ed o 25 kHz and hen sampled wi h a
sampling a e o 5 MHz by an NI USRP-2900 So wa e-De ined Radio (SDR).
The ADPLL was con igu ed in closed loop wi h h ee di e en ions (Xe,K and A ) o s udy i he SEEs
c oss sec ion has inc eased signi ican ly compa ed wi h ou p e ious in ege ADPLL.
The c oss sec ion o he es esul s a e shown in igu es below.
The c oss sec ion o his ac ional-N ADPLL was compa ed wi h ha o he p e ious in ege ADPLL, as
shown below. The c oss sec ion o he ac ional-N ADPLL is much highe han ha o he in ege
ADPLL. This unexpec ed esul may be due o he di e en cock ails used du ing he wo es s. Fu he
analysis is ongoing o de e mine he eason o his di e ence.
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EDMS NO.
3355734
VALIDITY
Released
REV.
1.0
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RADNEXT acknowledgmen :
This p ojec has ecei ed unding om he Eu opean Union's Ho izon 2020
esea ch and inno a ion p og amme unde g an ag eemen No 101008126.
