CLIC draft parameter table

CLIC DRAFT PARAMETER LIST

This table will be filled successively when new parameters become available.

Parameter	Symbol	Present	New	Unit
Overall Parameters
Center of mass energy	E_cm	3000	3000	GeV
Main Linac RF Frequency	f_RF	30	30	GHz
Luminosity	L	8	6.2	10³⁴cm^-2s^-1
Luminosity (in 1% of energy)	L_99%	3.3	3.3	10³⁴cm^-2s^-1
Linac repetition rate	f_rep	100	300	Hz
No. of particles / bunch	N_b	4.2	2.36	10⁹
No. of bunches / pulse	k_b	154	157
Bunch separation	Dt_b	0.67	0.267 (8 periods)	ns
Bunch train length	t_train	101	41.7	ns
Beam power / beam	P_b	14.8	26.6	MW
Unloaded / loaded gradient	G_unl/l	172 / 150	175 / 150	MV/m
Overall two linac length	l_linac	28	~28	km
Total beam delivery length	l_BD	2 x 2.6	2 x 2.6	km
Proposed site length	l_tot	33.2	~33.2	km
Total site AC power	P_tot	410	540	MW
Wall plug to main beam power efficiency	h_tot	9.3	12.9	%


Beam Delivery System + IP
Total collimation system length	l_coll	2 x 2.05	2 x 2.05	km
Total final Focus system length	l_FF	2 x 0.55	2 x 0.55	km
Input transverse horizontal emittance	ge_x	680	680	nm rad
Input transverse vertical emittance	ge_y	10	15	nm rad
Nominal horizontal IP beta function	b^*_x	6	7	mm
Nominal vertical IP beta function	b^*_y	0.07	0.09	mm
Horizontal IP beam size before pinch	s^*_x	60	~60	nm
Vertical IP beam size before pinch	s^*_y	0.7	~0.9	nm
Bunch length	s_s.inj	35	28	mm
Initial RMS Energy spread	s^*_DE/E	0.35	0.35	%
Total Energy spread		1	1	%
Crossing angle at IP	q_C	20	20	mrad
Disruptions	D_x / D_y	0.07 / 6.3	0.04 / 2.9
Beamstrahlung parameter	Υ₀	5	3
Beamstrahlung mom. spread	δ_B	21.1	15	%
No. of photons / electron	n_g	1.53	1.1
No. of pairs (p_T^min=20MeV/c, θ_min=0.2)	N_pairs	43	13.7
No. of coherent pairs	N_coh		10⁸
Hadronic events / crossing	N_hadron	2.26	0.54
No. of jets (p_T^min=3.2 GeV/c)	N_jets	1.51	0.36
Geometric luminosity⁺	L_geom	4.7	3.9	10³⁴cm^-2s^-1
Enhancement factor	H_D	1.7	1.6
Peak luminosity (ideal)⁺	L_pk	8	6.2	10³⁴cm^-2s^-1
Luminosity (in 1% of energy)	L_99%	3.3	3.3	10³⁴cm^-2s^-1
Peak luminosity (realistic)⁺	L_pk			10³⁴cm^-2s^-1
⁺the geometric luminosity is simply defined as N²/4p s^_xs^_y times the number of crossings per second, and assumes head-on collision, no hour-glass effect and no pinch. The peak luminosity is calculated using the Guignea Pig program and incorporates all the effects, including the pinch enhancement, hour-glass and cossing angle, plus any additional IP dilutions that may be expected. The realistic peak luminosity (compared to the ideal) one takes into account overhead from tuning and feedbacks and additional effects from a non-ideal final focus system.

Main Linac			HDS80 (with Mo tips)
Fill factor	F	78.6		%
Overhead for energy fdbk & repair	ovh_rep	6	5	%
Overhead for off-crest operation	ovh_off-crest	5	5	%
Acceleration structure length (active/full) (HDS80)	l_struct	0.5	0.244/0.28	m
a/l	a/l	0.225 – 0.175	0.194-0.15
Group velocity	v_g/c	10.4 – 5.2	8.1-4.2	%
Filling time	t_f	30	14	ns
Unloaded Quality factor	Q	3628 - 3621	3426 - 3434
Shunt impedance	R_s	73.3 - 98.1	97.8 - 129	MΩ/m
RF -> main beam efficiency	η_bRF	23.1	28.8	%

Decelerator
No. of drive beam sectors / linac	N_unit	22	25
Unit length (total)	L_unit,total	624	550	m
Average fill factor	F	64.1		%
No. of PETS / sector	N_PETS,unit	500	470
Length of PETS (active/overall)	L_PETS	0.8	0.6 / 0.8	m
Nominal output RF Power / PETS	P_out	512	556	MW
Transfer efficiency			95	%
Number of accelerating structures / PETS		2	4
Main beam acceleration power / PETS	P_acc	2 x 231	4 x 132	MW
Main beam energy gain / unit	DE_main	62.5	60	GeV
drive beam -> RF efficiency	η_decRF	74	76	%

PETS parameters (to be filled)
Main Beam at linac injection
Energy	E_b,inj	9	9	GeV
No. of particles / bunch	N_b	4.2	2.36+10%	10⁹
Bunch length	s_s.inj	35	28	mm
Energy spread	DE/E_inj	1.4		%
Transverse horizontal emittance	ge_x,inj			nm rad
Transverse vertical emittance	ge_y.inj	5		nm rad

Main Beam in damping ring before extraction
Energy	E_b,DR	2.424	2.424	GeV
Bunch length	s_s,DR	1300	1600	mm
Energy spread	sE/E_DR	0.135	0.12	%
Transverse horizontal emittance	ge_x.DR	450	500	nm rad
Transverse vertical emittance	ge_y,DR	3	5.5	nm rad
Longitudinal emittance (normalized)			4800	eVm
new values are calculated with IBS for wiggler period of 10cm, betatron coupling 1.1%, V_rf=2.55MV
Electron / positron damping ring
Ring circumference	C_DR	374.3	360	m
Number of trains stored	N_train	9	9
RF frequency	f_DR	1500	3750	MHz
Wiggler length	l_wig	158	153	m
Damping times	t_x/ t_y/ t_z	2.7/2.7/1.4	2.7/2.7/1.3	ms
Tunes	Q_x/ Q_y	69.21 / 29.63	69.82 / 34.86

Drive beam basic parameters			with 22.5mm PETS HDS80 Cu
Energy (decelerator injection)	E_in,dec	2	1.79	GeV
Energy (final, minimum)	E_fin,dec	200	179	MeV
Average current in pulse	I_dec	147	144	A
Train duration	t_train	130	55.6	ns
No. bunches / train	N_b.dec	1952	834
Bunch charge	Q_b,dec	9.8	9.6	nC
Bunch separation	D_b,dec	0.067	0.067	ns
Bunch length, rms	s_s,dec	0.4	0.4	mm
Normalized emittance, rms	ge_dec	150	150	mm rad

Drive Beam linac
RF frequency	f_RF	937	937	MHz
Total number of klystrons	N_kly	448	172
Klystron peak power	P_kly	50	50	MW
Repetition frequency	f_rep	100	300	Hz
Beam energy	E_i	2	1.79	GeV
Pulse length (total train)	t_i	92	92	ms
Beam current per pulse	I_i	4.6	4.5	A
Charge per pulse	Q_i	613	(~526)	mC
Number of bunches / pulse	N_b	~43000	~43000
Bunch length (rms)	s_s	4	4	mm
Normalized emittance (at injection)	ge_i	≤ 100	≤ 100	mm rad
Total energy spread (at injection)	DE/E	≤ 1	≤ 1	%
Wall plug -> RF efficiency	η_ACRF	58.5	58.5	%
RF -> drive beam efficiency	η_bRF	93	92	%

Delay Line
Length	L_D	39	17	m
RF deflector frequency	f_D	468	468	MHz
Combination factor	FC_D	2	2
Bunch length (rms)	s_s			mm

Combiner Ring 1			with 2 trains
Length	L_R1	78	69	m
RF deflector frequency	f_R1	937	937	MHz
Combination factor	FC_R1	4	4
Bunch length (rms)	s_s			mm

Combiner Ring 2			with 2 trains
Length	L_R2	312	275	m
RF deflector frequency	f_R2	3750	3750	MHz
Combination factor	FC_R2	4	4
Bunch length (rms)	s_s	≤ 2	≤ 2	mm