# Presentation: 801600

##   In-Air  X-ray detectors

**a new field of **
**extremely simple and powerful**
**beam diagnostics**
**BIW06   Fermilab   1-4 May 2006**
**Kees  Scheidt   ESRF**

## a tiny fraction (~2.10-6 = 300uW/mrad) 

**a tiny fraction (~2****.****10****-6**** = 300uW/mrad) **
**traverses the crotch  :  Xrays >150KeV**

**= 155W/mrad**

**40mm Cu & 5mm Fe**

## IR

**IR**

**Vis.**

**X-rays**

**Ec=20KeV**

**  ****this**
**device**

## Slide 4

## 200 KeV

**200 KeV**

## Slide 6

## Slide 7

## Side-View i.e. in the 

**Side-View i.e. in the **
**vertical plane of the beam**

## vertical

**vertical**

**horizontal**

**Vertical profile**

**measurement time = 1 millisec**

## Slide 10

## Slide 11

## Slide 12

##     	Imaging :

**scintillator +optics +camera**

**       ****Electric :**
**   ****Lead-Blade-BPM**

**  ****2 types of In-Air  X-ray detectors :**

## In-Air Lead-Blade-monitor for 

**Vertical Beam Motion (********v=35m)**
**installed behind crotch of Cell 5**

## +50V

**+50V**

**I [upto uA]**

## ~1000um

**~130um**
**   ****fwhm**

**~1000um**

**~1000um**

## A

**A**

**E**

**B**

**C**

**D**

**V**

**um**

## > 1uA

**P**

**P**

**> 1uA**

**+50V**

**What is creating this current ?**
**In : Xray =  10****11**** photons/sec**
**Out :1uA= 10****13**** electrons/sec**
**Showers of secondary particles,**
**created themselves by the interaction **
**of X-photons with Lead,**
**cause the air-particles to ionise.**

**V**

## +50V

**S**

**S**

**vertically adjusted so that**
**Upper Blade intercepts**
**~50% of the X-ray beam :**
**  ****detector with extreme **
**         ****sensitivity to **
**   ****vertical beam motion**

**+50V**

**I **

## Slide 20

## t [sec]

**t [sec]**

**  ****multiple**
**10um steps**

**[V]**

**limited linearity range (about +/- 20um)**

## Slide 22

## Slide 23

## Slide 24

## 			Lead-Blade-Monitor :

**BIW06, FermiLab, May1-4**
**Conclusions : **

**	****	****	****Lead-Blade-Monitor :**
**analysis after cross-comparison with other diagnostics**
**(classical X-BPMs, CO-BPMs, F-BPMs, and ID-25-fast) :**
**more performance . . . for much less complexity !!**
**if installed behind a large number (16, 32, 64max.) of **
**crotches they would form an excellent global **_**vertical**_** stability **
**monitor system for both DC and AC.**
**8 installations foreseen in 2006 (for survey purposes only)**
**In 2007 possibly more installations and**
**integration into the global feedback system.**

##       Why are In-Air X-ray detectors so powerful  ? :

**Excellent conversion efficiency of the detector material :**
**-    CdWO4 for the Imaging devices**
**-****	**** Lead,Tungsten or Gold for the Blade-Monitor **
**2) They touch the **_**heart**_** of the beam, **
**    ****other diagnostics can not reach there and get **
**    ****much smaller signal from the edges or tails**
**3) The 6GeV ESRF has nice crotches !!  (40mm is not too thick)**

**But can they find application in **
**medium energy light sources ??**

## 200KeV

**ESRF dipole**

**200KeV**

**Soleil**

**Diamond**

**emitted Hard X-rays : Flux comparison 6 GeV ESRF with Soleil & Diamond**

##    ANKA

**   ****ANKA**
**   ****2.5 GeV**
**Karlsruhe**
**Germany**

##    ANKA

**   ****ANKA**
**   ****2.5 GeV**
**Karlsruhe**
**Germany**

##    ANKA

**   ****ANKA**
**Peak Energy**
**at 80KeV**

**   ****ESRF**
**Peak Energy**
**at 170KeV**

**1E-7=3.4uW/mrad**

**2E-6=300uW/mrad**

**   ****ANKA**
**   ****2.5 GeV**
**Karlsruhe**
**Germany**

## vertical 

- vertical
- profile

**   ****ANKA**
**   ****2.5 GeV**
**Karlsruhe**
**Germany**

##    ANKA

**   ****ANKA**
**   ****2.5 GeV**
**Karlsruhe**
**Germany**

##           ESRF

**          ****ESRF**
**    ****TransferLine2**
**   ****6 GeV 5mA 1us**

## ESRF  TL-2

-     beamsize
- ~**130um** fwhm

-     beamsize
- ~**430um** fwhm

**ESRF  TL-2**
**Xrays-In-Air**
- d~2m,
- ~10mm Fe
- E~75KeV
- ph.div.~66urad

- I=5mA, 1uS
- Vertical profiles for
- different quadrupole
- currents