Fast	  MRPC-­‐TOF	  R&D	  	  @	  U.	  Tsukuba	Tatsuya	  Chujo	  (Univ.	  of	  Tsukuba)	  	  Mini	  workshop	  on	  RPC	  at	  Univ.	  of	  Tsukuba,	  January	  20,	  2017	  JSPS Grant:	
“10 ps TOF detector R&D for high energy experiments” (FY 2015 – 2017, PI T. Chujo)	
1	

Members	
• University	  of	  Tsukuba:	  – T.	  Chujo,	  T.	  Nonaka	  (D2),	  R.	  Aoyama	  (D1),	  T.	  Sugiura	  (D1),	  K.	  Sato	  (M1),	  R.	  Koyama(M2),	  T.	  Ichisawa	  (B4),	  H.	  Kato	  (B4)	  • Tsukuba	  Technology	  University:	  – M.	  Inaba	  (pre-­‐amp,	  detector	  design)	  • JAEA:	  – H.	  Sako,	  S.	  Sato	  • KEK:	  – K.	  Ozawa,	  K.	  Aoki	  2	Contents	
1. IntroducOon	  – Historical	  background	  on	  MRPC-­‐TOF	  R&D	  in	  Tsukuba	  (PHENIX	  MRPC	  TOF)	  2. 4	  Stuck	  MRPCs R&D	  w/	  cosmic	  rays	  @	  Tsukuba	  3. Signal	  properOes	  (collaboraOon	  w/	  SONY)	  	  	  4. Test	  beam	  experiment	  in	  2016	  @	  ELPH	  5. Summary	  and	  future	  plans	  	  3	&'()%+,!%U(GLAD]W%

2006. Sep. 13

T. Chujo (U. Tsukuba)!

RIKEN SeminarC'

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2006. Sep. 13

T. Chujo (U. Tsukuba)!

RIKEN SeminarU'

3 Prototypes
PH1

PH2PH3Different pad/strip design, same structure inside•!PH1: 50.9 x 53.5 cm2, 32 strips, readout at both ends.
•!PH2: 12.5 x 53.5 cm2, 8 strips, readout at both ends.
2006. Sep. 13RIKEN Seminar2•!PH3: 12.7 x 53.7 cm2, 48 pads
(6x2 cm ), similar to STAR MRPC.
T. Chujo (U. Tsukuba)!

W'

(GLAD]%&'()%+,!%T6;$;$:T4#%U64#1H$#^%PYYQW%
Time Resolution

Efficiency•! PH1: worse timing resolution (>150 ps), same efficency as PH2. Problem on uniformityof performance across the chamber. Difficulties in mechanical assembly.
•! PH2: 68ps timing resolution at optimal condition,but 90% efficiency. Solution ! increase strip width.
d'Sep.
13•!T.2006.
PH3:
comparable
timing resolution withRIKEN
PH2Seminar(best value: 67ps), 98% efficiency.
Chujo (U. Tsukuba)!

Phys.	  Rev.	  C	  85,	  064914	  (2012)		  PHENIX	  TOF-­‐W:	  a	  total	  of	  128	  MRPCs,	  512	  strips,	  and	  1024	  readouts.	  	  Timing	  resolubon	  is	  84	  ps	  in	  Au	  +	  	  Au.	
(includes	  the	  uncertainty	  in	  the	  start	  bme	  BBC)	
PHYSICAL	  REVIEW	  C	  88,	  024906	  (2013)	
T. Chujo (U. Tsukuba)!

8	2.	  4	  Stuck	  MRPCs R&D	  	  w/	  cosmic	  rays	  @	  Tsukuba	  	1. Reproduce	  a	  good	  bming	  resolubon	  20-­‐40	  ps	  by	  4	  stuck	  MRPCs.	  
2. Opbmize	  the	  parameters	  (#	  of	  gas	  gaps,	  gas	  gap	  width,	  etc.)	  3. R&D	  for	  the	  J-­‐PARC	  Heavy	  Ion	  project	  (30	  ps	  TOF	  for	  hadron	  and	  muon	  ID)	  &	  potenbal	  use	  for	  J-­‐PARC	  E16.	  
4. Extensive	  study	  with	  cosmic	  rays.	  
9	!/;/.>'?E$+M%b+.',D$5

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165	  micron,	  	  	  6	  gaps	

148	  micron,	  	  	  6	  gaps	

128	  micron,	  	  	  7	  gaps	

104	  micron,	  	  	  9	  gaps	

90	  micron,	  	  11	  gaps	
13	_Y';/H?+.6''<<'>"D$

Typical	  setup	  for	  MRPC	MRPC	

preampliﬁer	  (M.	  Inaba)	

15	

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••
••
•

Two	  types	  (pad	  and	  slat)	  PCB	  have	  been	  made.	  
20	  cm	  x	  30	  cm	  PCB	  size	  built	  4	  stack	  MRPCs	  for	  each	  bme,	  under	  the	  test	  with	  cosmic	  rays.	  
to	  be	  tested	  at	  ELPH.	  
It	  could	  be	  a	  prototype	  for	  E-­‐16.	  
17	@	  U.	  Tsukuba	  lab.	
18	

3.	  Signal	  properOes	  	  (collaboraOon	  w/	  SONY)	  	  	  • SONY	  Global	  Manufacturing	  &	  Operabons	  Co.	  (SONY	  GM&O)	  • Modeling	  MRPC	  detector	  – Electromagnebc	  ﬁeld	  cal.	  by	  solving	  Maxwell	  eq.	  numerically.	  
– Consulbng	  of	  fast	  signal	  propagabon	  in	  electrodes,	  cables,	  impedance	  matching,	  and	  actual	  test.	

19	

ElectromagneOc	  ﬁeld	  cal.	  Model	  (SONY)	
HFSS  analysis,  MRPC-3D  model■Side  view

FEE  PCB＜Time＞

Current  generation  point＜Frequency＞

Amplitude：1A
Rise  time：500ps

50Ωtermination
1GHz■Side  view

Electrode

Current  generation  point■Side  view  (2stack,4stack)

Electrode Cable

20	  2GHz 3GHz

An	  example:	  proposed	  modiﬁcabons	  (SONY)	
Electric filed near electrodes（as a function of time）
Defaulthigh density of electric field on theedges of electrodesinterference

Modified (Ref. conductor)

Ref conductor, reduce the dispersion ofelectric filed small interference21	  LX"5TH4=%(1H#4%64#T;7#4
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88'Proposed	  modiﬁcabon（Dec.	  2015）	
Plan  ①：  Multi  layer  PCB

Plan  ②：  Patch  structure

・Electrodes  in  the  different  layer  of  PCB・GND  above  electrodes  ・Add  current  on  near-by  electrodes  (by  a  different  circuit)・electrode  pad:  24mm×24mm
・put  co-axial  connector  and  cables  on  each  padcloser  view

cross  section

GND※  co-axial  cablecross  section（image）
Electrode23	  Design	  consideraOons	– Grounding,	  signal	  reﬂecbon,	  impedance	  matching,	  preamp	  design.	  
– Two	  prototypes	  has	  been	  tested	  at	  ELPH	  beam	  test	  in	  Nov.	  2016,	  together	  with	  the	  planed	  MRPC	  prototypes	  (small	  and	  medium	  sizes).	

24	

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Patch	

Small	  slat	Mulb-­‐layer	  w/	  GND	  (for	  current	  sum)	

25	

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K.	  Sato	a)	  Comparison	  w/	  cosmic	  ray	  measurements	b)	  Comparison	  w/	  other	  types	  (cosmic)	

-­‐	  Consistent	  with	  the	  results	  with	  cosmic	  -­‐	  Try	  104	  micron	  with	  beams	  (next	  step)	

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Type	  1:	  Default	

H.	  Kato	

Type	  2:	  Small	  slat	-­‐	  Expected	  bming	  resolubon	  is	  80-­‐100	  ps,	  but	  we	  focused	  on	  the	  signal	  shape	  change	  due	  to	  the	  pad	  shape.	  
-­‐	  Collaborabon	  with	  SONY.	  	  	
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Impedance	  measurements	  @	  SONY	

Connected	  signal	  cables	  and	  MRPC,	  TDR	  (diﬀerenbal	  impedance)	  measurement	  for	  the	  	  real	  prototype:	  • Cable’s	  diﬀerenbal	  	  impedance:	  ~100	  Ohm	  • MRPC’s	  diﬀerenbal	  	  impedance:	  ~50	  Ohm	  →	  Needed	  to	  be	  match	  !	  	  

36	5.	  Summary	  and	  future	  plans	  	  • Diﬀerent	  type	  of	  MRPCs	  have	  been	  built	  and	  tested	  with	  cosmic	  and	  test	  beam	  at	  ELPH,	  with	  the	  collaborabon	  with	  SONY.	  
– Importance	  of	  impedance	  matching	  and	  gain	  opbmizabon	  for	  each	  type	  of	  MRPC	  (measurement).	  
– For	  4	  stuck	  165	  um	  (104	  um)	  MPRCs	  (small	  type):	  best	  value	  ~47	  ps	  with	  cosmic	  ray,	  and	  67	  ps	  with	  beams	  (ELPH).	  
– Need	  more	  opbmizabon	  for	  medium	  scale	  MRPC	  (reﬂecbon)	  – Narrower	  pad	  (~	  1.2	  cm	  width)	  has	  a	  be~er	  properbes	  on	  signal	  shape	  and	  bming.	  	  • Plan	  in	  2017:	  – Try	  104	  and	  90	  um	  gap	  size,	  with	  “on	  board”	  diﬀerenbal	  amp	  for	  each	  stuck	  ﬁrst,	  and	  then	  summing	  (SONY,	  M.	  Inaba).	  
– Test	  on	  patch	  type,	  and	  further	  study	  on	  larger	  area	  MRPC.	  	  – ELPH	  test	  beam	  in	  late	  2017.	  
– Collaborabon	  with	  M.	  Chiu	  (BNL)	  for	  sPHENIX	  fast	  TOF	  (achieved	  18	  ps	  bming	  resolubon)	  – Garﬁeld++	  simulabon?	  
– Readout	  electronics	  R&D	  using	  DRS4	  and	  prototyping.	  
37	

BACKUP	38	39